Articles | Volume 17, issue 20
Research article 26 Oct 2017
Research article | 26 Oct 2017
Modeling the erythemal surface diffuse irradiance fraction for Badajoz, Spain
Guadalupe Sanchez et al.
No articles found.
Kaisa Lakkala, Antti Arola, Julian Gröbner, Sergio Fabian León-Luis, Alberto Redondas, Stelios Kazadzis, Tomi Karppinen, Juha Matti Karhu, Luca Egli, Anu Heikkilä, Tapani Koskela, Antonio Serrano, and José Manuel Vilaplana
Atmos. Meas. Tech., 11, 5167–5180,Short summary
The performance of the cosine error correction method for correcting spectral UV measurements of the Brewer spectroradiometer was studied. The correction depends on the sky radiation distribution, which can change during one spectral scan. The results showed that the correction varied between 4 and 14 %, and that the relative differences between the reference and the Brewer diminished by 10 %. The method is applicable to other instruments as long as the required input parameters are available.
Alberto Cazorla, Juan Andrés Casquero-Vera, Roberto Román, Juan Luis Guerrero-Rascado, Carlos Toledano, Victoria E. Cachorro, José Antonio G. Orza, María Luisa Cancillo, Antonio Serrano, Gloria Titos, Marco Pandolfi, Andres Alastuey, Natalie Hanrieder, and Lucas Alados-Arboledas
Atmos. Chem. Phys., 17, 11861–11876,Short summary
This work presents a method for the calibration and automated quality assurance of inversion of ceilometer profiles that is applied to the Iberian Ceilometer Network (ICENET). A cast study during an unusually intense dust outbreak affecting the Iberian Peninsula is shown. Results reveal that it is possible to obtain a quantitative optical aerosol characterization with ceilometers over large areas, and this information has a great potential for alert systems and model assimilation and evaluation.
Luca Egli, Julian Gröbner, Gregor Hülsen, Luciano Bachmann, Mario Blumthaler, Jimmy Dubard, Marina Khazova, Richard Kift, Kees Hoogendijk, Antonio Serrano, Andrew Smedley, and José-Manuel Vilaplana
Atmos. Meas. Tech., 9, 1553–1567,Short summary
Array spectroradiometers are small, light, robust and cost-effective instruments, and are increasingly used for atmospheric measurements. The quality of array spectroradiometers is assessed for the reliable quantification of ultraviolet radiation (UV) in order to monitor the exposure of UV radiation to human health. The study shows that reliable UV measurements with these instruments are limited for observations around noon and show large biases in the morning and evening.
Related subject area
Subject: Radiation | Research Activity: Atmospheric Modelling | Altitude Range: Troposphere | Science Focus: Physics (physical properties and processes)Impacts of multi-layer overlap on contrail radiative forcingBias in CMIP6 models as compared to observed regional dimming and brighteningA test of the ability of current bulk optical models to represent the radiative properties of cirrus cloud across the mid- and far-infraredThe incorporation of the Tripleclouds concept into the δ-Eddington two-stream radiation scheme: solver characterization and its application to shallow cumulus cloudsRadiative heating rate profiles over the southeast Atlantic Ocean during the 2016 and 2017 biomass burning seasonsEffective radiative forcing and adjustments in CMIP6 modelsResponse of surface shortwave cloud radiative effect to greenhouse gases and aerosols and its impact on summer maximum temperatureCombining atmospheric and snow radiative transfer models to assess the solar radiative effects of black carbon in the ArcticAccurate 3-D radiative transfer simulation of spectral solar irradiance during the total solar eclipse of 21 August 2017Quantifying the bias of radiative heating rates in numerical weather prediction models for shallow cumulus cloudsThe climate effects of increasing ocean albedo: an idealized representation of solar geoengineeringChanges in clouds and thermodynamics under solar geoengineering and implications for required solar reductionRadiative impact of an extreme Arctic biomass-burning eventContrails and their impact on shortwave radiation and photovoltaic power production – a regional model studyThe influence of internal variability on Earth's energy balance framework and implications for estimating climate sensitivityInsights into the diurnal cycle of global Earth outgoing radiation using a numerical weather prediction modelDetermining the infrared radiative effects of Saharan dust: a radiative transfer modelling study based on vertically resolved measurements at LampedusaThe early summertime Saharan heat low: sensitivity of the radiation budget and atmospheric heating to water vapour and dust aerosolThe role of 1-D and 3-D radiative heating in the organization of shallow cumulus convection and the formation of cloud streetsDisk and circumsolar radiances in the presence of ice cloudsEffects of 3-D thermal radiation on the development of a shallow cumulus cloud fieldRegional and seasonal radiative forcing by perturbations to aerosol and ozone precursor emissionsThe spectral signature of cloud spatial structure in shortwave irradianceEffects of urban agglomeration on surface-UV doses: a comparison of Brewer measurements in Warsaw and Belsk, Poland, for the period 2013–2015Global and regional radiative forcing from 20 % reductions in BC, OC and SO4 – an HTAP2 multi-model studyA new parameterization of the UV irradiance altitude dependence for clear-sky conditions and its application in the on-line UV tool over Northern EurasiaImplementation of Bessel's method for solar eclipses prediction in the WRF-ARW modelImpact of buildings on surface solar radiation over urban BeijingEvaluating the spatio-temporal performance of sky-imager-based solar irradiance analysis and forecastsOn the ability of RegCM4 regional climate model to simulate surface solar radiation patterns over Europe: an assessment using satellite-based observationsAn investigation of how radiation may cause accelerated rates of tropical cyclogenesis and diurnal cycles of convective activityThe impact of parameterising light penetration into snow on the photochemical production of NOx and OH radicals in snowA global model simulation for 3-D radiative transfer impact on surface hydrology over the Sierra Nevada and Rocky MountainsRadiative forcing and climate metrics for ozone precursor emissions: the impact of multi-model averagingErythemal ultraviolet irradiation trends in the Iberian Peninsula from 1950 to 2011Regional climate model assessment of the urban land-surface forcing over central EuropeImpact of cirrus clouds heterogeneities on top-of-atmosphere thermal infrared radiationSummer Arctic sea ice albedo in CMIP5 modelsA WRF simulation of the impact of 3-D radiative transfer on surface hydrology over the Rocky Mountains and Sierra NevadaTechnical Note: Evaluating a simple parameterization of radiative shortwave forcing from surface albedo changeThe cloud–aerosol–radiation (CAR) ensemble modeling systemDust vertical profile impact on global radiative forcing estimation using a coupled chemical-transport–radiative-transfer modelSource attribution of insoluble light-absorbing particles in seasonal snow across northern ChinaModeling the radiative effects of desert dust on weather and regional climateSimulating 3-D radiative transfer effects over the Sierra Nevada Mountains using WRFOn the interpretation of an unusual in-situ measured ice crystal scattering phase functionRadiative impacts of cloud heterogeneity and overlap in an atmospheric General Circulation ModelEstimating cloud optical thickness and associated surface UV irradiance from SEVIRI by implementing a semi-analytical cloud retrieval algorithmSensitivity of radiative properties of persistent contrails to the ice water pathAnthropogenic changes in the surface all-sky UV-B radiation through 1850–2005 simulated by an Earth system model
Inés Sanz-Morère, Sebastian D. Eastham, Florian Allroggen, Raymond L. Speth, and Steven R. H. Barrett
Atmos. Chem. Phys., 21, 1649–1681,Short summary
Contrails cause ~50 % of aviation climate impacts, but this is highly uncertain. This is partly due to the effect of overlap between contrails and other cloud layers. We developed a model to quantify this effect, finding that overlap with natural clouds increased contrails' radiative forcing in 2015. This suggests that cloud avoidance may help in reducing aviation's climate impacts. We also find that contrail–contrail overlap reduces impacts by ~3 %, increasing non-linearly with optical depth.
Kine Onsum Moseid, Michael Schulz, Trude Storelvmo, Ingeborg Rian Julsrud, Dirk Olivié, Pierre Nabat, Martin Wild, Jason N. S. Cole, Toshihiko Takemura, Naga Oshima, Susanne E. Bauer, and Guillaume Gastineau
Atmos. Chem. Phys., 20, 16023–16040,Short summary
In this study we compare solar radiation at the surface from observations and Earth system models from 1961 to 2014. We find that the models do not reproduce the so-called
global dimmingas found in observations. Only model experiments with anthropogenic aerosol emissions display any dimming at all. The discrepancies between observations and models are largest in China, which we suggest is in part due to erroneous aerosol precursor emission inventories in the emission dataset used for CMIP6.
Richard J. Bantges, Helen E. Brindley, Jonathan E. Murray, Alan E. Last, Jacqueline E. Russell, Cathryn Fox, Stuart Fox, Chawn Harlow, Sebastian J. O'Shea, Keith N. Bower, Bryan A. Baum, Ping Yang, Hilke Oetjen, and Juliet C. Pickering
Atmos. Chem. Phys., 20, 12889–12903,Short summary
Understanding how ice clouds influence the Earth's energy balance remains a key challenge for predicting the future climate. These clouds are ubiquitous and are composed of ice crystals that have complex shapes that are incredibly difficult to model. This work exploits new measurements of the Earth's emitted thermal energy made from instruments flown on board an aircraft to test how well the latest ice cloud models can represent these clouds. Results indicate further developments are required.
Nina Črnivec and Bernhard Mayer
Atmos. Chem. Phys., 20, 10733–10755,Short summary
Unresolved interaction between clouds and atmospheric radiation is a source of uncertainty in weather and climate models. The present study highlights the potential of the state-of-the-art Tripleclouds radiative solver for shallow cumulus clouds, exposing the significance of properly representing subgrid cloud horizontal heterogeneity. The Tripleclouds concept was thereby incorporated in the widely employed δ-Eddington two-stream radiation scheme within the comprehensive libRadtran library.
Allison B. Marquardt Collow, Mark A. Miller, Lynne C. Trabachino, Michael P. Jensen, and Meng Wang
Atmos. Chem. Phys., 20, 10073–10090,Short summary
Uncertainties in marine boundary layer clouds arise in the presence of biomass burning aerosol, as is the case over the southeast Atlantic Ocean. Heating due to this aerosol has the potential to alter the thermodynamic profile as the aerosol is transported across the Atlantic Ocean. Radiation transfer experiments indicate local shortwave aerosol heating is ~2–8 K d−1; however uncertainties in this quantity exist due to the single-scattering albedo and back trajectories of the aerosol plume.
Christopher J. Smith, Ryan J. Kramer, Gunnar Myhre, Kari Alterskjær, William Collins, Adriana Sima, Olivier Boucher, Jean-Louis Dufresne, Pierre Nabat, Martine Michou, Seiji Yukimoto, Jason Cole, David Paynter, Hideo Shiogama, Fiona M. O'Connor, Eddy Robertson, Andy Wiltshire, Timothy Andrews, Cécile Hannay, Ron Miller, Larissa Nazarenko, Alf Kirkevåg, Dirk Olivié, Stephanie Fiedler, Anna Lewinschal, Chloe Mackallah, Martin Dix, Robert Pincus, and Piers M. Forster
Atmos. Chem. Phys., 20, 9591–9618,Short summary
The spread in effective radiative forcing for both CO2 and aerosols is narrower in the latest CMIP6 (Coupled Model Intercomparison Project) generation than in CMIP5. For the case of CO2 it is likely that model radiation parameterisations have improved. Tropospheric and stratospheric radiative adjustments to the forcing behave differently for different forcing agents, and there is still significant diversity in how clouds respond to forcings, particularly for total anthropogenic forcing.
Tao Tang, Drew Shindell, Yuqiang Zhang, Apostolos Voulgarakis, Jean-Francois Lamarque, Gunnar Myhre, Camilla W. Stjern, Gregory Faluvegi, and Bjørn H. Samset
Atmos. Chem. Phys., 20, 8251–8266,Short summary
By using climate simulations, we found that both CO2 and black carbon aerosols could reduce low-level cloud cover, which is mainly due to changes in relative humidity, cloud water, dynamics, and stability. Because the impact of cloud on solar radiation is in effect only during daytime, such cloud reduction could enhance solar heating, thereby raising the daily maximum temperature by 10–50 %, varying by region, which has great implications for extreme climate events and socioeconomic activity.
Tobias Donth, Evelyn Jäkel, André Ehrlich, Bernd Heinold, Jacob Schacht, Andreas Herber, Marco Zanatta, and Manfred Wendisch
Atmos. Chem. Phys., 20, 8139–8156,Short summary
Solar radiative effects of Arctic black carbon (BC) particles (suspended in the atmosphere and in the surface snowpack) were quantified under cloudless and cloudy conditions. An atmospheric and a snow radiative transfer model were coupled to account for radiative interactions between both compartments. It was found that (i) the warming effect of BC in the snowpack overcompensates for the atmospheric BC cooling effect, and (ii) clouds tend to reduce the atmospheric BC cooling and snow BC warming.
Paul Ockenfuß, Claudia Emde, Bernhard Mayer, and Germar Bernhard
Atmos. Chem. Phys., 20, 1961–1976,Short summary
We model solar radiation as it would be measured on the Earth's surface in the core shadow of a total solar eclipse. Subsequently, we compare our results to observations during the total eclipse 2017 for ultraviolet, visible and near-infrared wavelengths. Moreover, we analyze the effect of the surface reflectance, the ozone profile, aerosol and the topography and give a visualization of the prevailing photons paths in the atmosphere during the eclipse.
Nina Črnivec and Bernhard Mayer
Atmos. Chem. Phys., 19, 8083–8100,Short summary
The interaction between radiation and clouds represents a source of uncertainty in numerical weather prediction (NWP), due to both intrinsic problems of one-dimensional radiation schemes and poor representation of clouds. The underlying question addressed in this study is how large the bias is of radiative heating rates in NWP models for shallow cumulus clouds and how it scales with various parameters, such as solar zenith angle, surface albedo, cloud cover and liquid water path.
Ben Kravitz, Philip J. Rasch, Hailong Wang, Alan Robock, Corey Gabriel, Olivier Boucher, Jason N. S. Cole, Jim Haywood, Duoying Ji, Andy Jones, Andrew Lenton, John C. Moore, Helene Muri, Ulrike Niemeier, Steven Phipps, Hauke Schmidt, Shingo Watanabe, Shuting Yang, and Jin-Ho Yoon
Atmos. Chem. Phys., 18, 13097–13113,Short summary
Marine cloud brightening has been proposed as a means of geoengineering/climate intervention, or deliberately altering the climate system to offset anthropogenic climate change. In idealized simulations that highlight contrasts between land and ocean, we find that the globe warms, including the ocean due to transport of heat from land. This study reinforces that no net energy input into the Earth system does not mean that temperature will necessarily remain unchanged.
Rick D. Russotto and Thomas P. Ackerman
Atmos. Chem. Phys., 18, 11905–11925,Short summary
In simulations with different climate models in which the strength of the Sun is reduced to cancel the surface warming from a quadrupling of atmospheric carbon dioxide, low cloud cover decreases, high cloud cover increases, the upper troposphere and stratosphere cool, and water vapor concentration decreases. The stratospheric cooling and low cloud reduction result in more sunlight reduction being needed than originally thought.
Justyna Lisok, Anna Rozwadowska, Jesper G. Pedersen, Krzysztof M. Markowicz, Christoph Ritter, Jacek W. Kaminski, Joanna Struzewska, Mauro Mazzola, Roberto Udisti, Silvia Becagli, and Izabela Gorecka
Atmos. Chem. Phys., 18, 8829–8848,Short summary
The aim of the presented study was to investigate the impact on the radiation budget and atmospheric dynamics of a biomass-burning plume, transported from Alaska to the High Arctic region of Ny-Ålesund, Svalbard, in early July 2015. We found that the smoke plume may significantly alter radiative properties of the atmosphere. Furthermore, the simulations of atmospheric dynamics indicated a vertical positive displacement and broadening of the plume with time.
Simon Gruber, Simon Unterstrasser, Jan Bechtold, Heike Vogel, Martin Jung, Henry Pak, and Bernhard Vogel
Atmos. Chem. Phys., 18, 6393–6411,Short summary
A numerical model also used for operational weather forecast was applied to investigate the impact of contrails and contrail cirrus on the radiative fluxes at the earth's surface. Accounting for contrails produced by aircraft enables the model to simulate high clouds that are otherwise missing. In a case study, we find that the effect of these extra clouds is to reduce the incoming shortwave radiation at the surface as well as the production of photovoltaic power by up to 10 %.
Andrew E. Dessler, Thorsten Mauritsen, and Bjorn Stevens
Atmos. Chem. Phys., 18, 5147–5155,Short summary
One of the most important parameters in climate science is the equilibrium climate sensitivity (ECS). Estimates of this quantity based on 20th-century observations suggest low values of ECS (below 2 °C). We show that these calculations may be significantly in error. Together with other recent work on this problem, it seems probable that the ECS is larger than suggested by the 20th-century observations.
Jake J. Gristey, J. Christine Chiu, Robert J. Gurney, Cyril J. Morcrette, Peter G. Hill, Jacqueline E. Russell, and Helen E. Brindley
Atmos. Chem. Phys., 18, 5129–5145,
Daniela Meloni, Alcide di Sarra, Gérard Brogniez, Cyrielle Denjean, Lorenzo De Silvestri, Tatiana Di Iorio, Paola Formenti, José L. Gómez-Amo, Julian Gröbner, Natalia Kouremeti, Giuliano Liuzzi, Marc Mallet, Giandomenico Pace, and Damiano M. Sferlazzo
Atmos. Chem. Phys., 18, 4377–4401,Short summary
This study examines how different aerosol optical properties determine the dust longwave radiative effects at the surface, in the atmosphere and at the top of the atmosphere, based on the combination of remote sensing and in situ observations from the ground, from airborne sensors, and from space, by means of radiative transfer modelling. The closure experiment is based on longwave irradiances and spectral brightness temperatures measured during the 2013 ChArMEx–ADRIMED campaign at Lampedusa.
Netsanet K. Alamirew, Martin C. Todd, Claire L. Ryder, John H. Marsham, and Yi Wang
Atmos. Chem. Phys., 18, 1241–1262,Short summary
This paper quantifies the radiative effects of dust and water vapour in the Saharan heat low. Dust has a warming effect at the top of the atmosphere while cooling the surface. Water vapour has a warming effect both at the top of atmosphere and the surface. We find dust and water vapour have similar effects in driving the variability in the top-of-atmosphere radiative budget, while dust has a stronger effect than water vapour in controlling day-to-day variability of the surface radiative budget.
Fabian Jakub and Bernhard Mayer
Atmos. Chem. Phys., 17, 13317–13327,Short summary
The formation of shallow cumulus cloud streets was historically attributed primarily to dynamics. Here, we focus on the interaction between radiatively induced surface heterogeneities and the resulting patterns in the flow. Our results suggest that solar radiative heating has the potential to organize clouds perpendicular to the sun's incidence angle.
Päivi Haapanala, Petri Räisänen, Greg M. McFarquhar, Jussi Tiira, Andreas Macke, Michael Kahnert, John DeVore, and Timo Nousiainen
Atmos. Chem. Phys., 17, 6865–6882,Short summary
The dependence of solar-disk and circumsolar radiances on ice cloud properties is studied with a Monte Carlo radiative transfer model. Ice crystal roughness (or more generally, non-ideality) is found to be the most important parameter influencing the circumsolar radiance, and ice crystal sizes and shapes also play significant roles. When comparing with radiances measured with the SAM instrument, rough ice crystals reproduce the measurements better than idealized smooth ice crystals do.
Carolin Klinger, Bernhard Mayer, Fabian Jakub, Tobias Zinner, Seung-Bu Park, and Pierre Gentine
Atmos. Chem. Phys., 17, 5477–5500,Short summary
Radiation is driving weather and climate. Yet, the effect of radiation on clouds is not fully understood and often only poorly represented in models. Better understanding and better parameterizations of the radiation–cloud interaction are therefore essential. Using our newly developed fast
neighboring column approximationfor 3-D thermal heating and cooling rates, we show that thermal radiation changes cloud circulation and causes organization and a deepening of the clouds.
Nicolas Bellouin, Laura Baker, Øivind Hodnebrog, Dirk Olivié, Ribu Cherian, Claire Macintosh, Bjørn Samset, Anna Esteve, Borgar Aamaas, Johannes Quaas, and Gunnar Myhre
Atmos. Chem. Phys., 16, 13885–13910,Short summary
This study uses global climate models to quantify how strongly man-made emissions of selected pollutants modify the energy budget of the Earth. The pollutants studied interact directly and indirectly with sunlight and terrestrial radiation and remain a relatively short time in the atmosphere, leading to regional and seasonal variations in their impacts. This new data set is useful to compare the potential climate impacts of different pollutants in support of policies to reduce climate change.
Shi Song, K. Sebastian Schmidt, Peter Pilewskie, Michael D. King, Andrew K. Heidinger, Andi Walther, Hironobu Iwabuchi, Gala Wind, and Odele M. Coddington
Atmos. Chem. Phys., 16, 13791–13806,Short summary
The radiative effects of spatially complex cloud fields are notoriously difficult to estimate and are afflicted with errors up to ±50 % of the incident solar radiation. We find that horizontal photon transport, the leading cause for these three-dimensional effects, manifests itself through a spectral fingerprint – a new observable that holds promise for reducing the errors associated with spatial complexity by moving the problem to the spectral dimension.
Agnieszka E. Czerwińska, Janusz W. Krzyścin, Janusz Jarosławski, and Michał Posyniak
Atmos. Chem. Phys., 16, 13641–13651,Short summary
This article presents a comparison between the two surface-UV dose series, measured with Brewer spectrophotometers working simultaneously at two different sites in Poland: in a large city agglomeration and in the suburbs. We consider whether the city of Warsaw acts as a shield from ultraviolet overexposure. Our study proves that the UV level in Warsaw is slightly lower than that found in cleaner suburbs of the city.
Camilla Weum Stjern, Bjørn Hallvard Samset, Gunnar Myhre, Huisheng Bian, Mian Chin, Yanko Davila, Frank Dentener, Louisa Emmons, Johannes Flemming, Amund Søvde Haslerud, Daven Henze, Jan Eiof Jonson, Tom Kucsera, Marianne Tronstad Lund, Michael Schulz, Kengo Sudo, Toshihiko Takemura, and Simone Tilmes
Atmos. Chem. Phys., 16, 13579–13599,Short summary
Air pollution can reach distant regions through intercontinental transport. Here we first present results from the Hemispheric Transport of Air Pollution Phase 2 exercise, where many models performed the same set of coordinated emission-reduction experiments. We find that mitigations have considerable extra-regional effects, and show that this is particularly true for black carbon emissions, as long-range transport elevates aerosols to higher levels where their radiative influence is stronger.
Nataly Chubarova, Yekaterina Zhdanova, and Yelena Nezval
Atmos. Chem. Phys., 16, 11867–11881,Short summary
Biologically active ultraviolet (UV) radiation is an important environmental factor, which affect human health and nature. UV radiation has a significant increase with the altitude. We propose a new method for calculating the altitude UV dependence for different types of biologically active UV radiation. The proposed method was implemented in the on-line UV tool (http://momsu.ru/uv/) for Northern Eurasia. The possible UV effects on human health were considered over Alpine zone.
Alex Montornès, Bernat Codina, John W. Zack, and Yolanda Sola
Atmos. Chem. Phys., 16, 5949–5967,Short summary
This paper documents a new package for the Weather Research and Forecasting--Advanced Research WRF (WRF-ARW) model that can simulate any partial, total or hybrid solar eclipse for the period 1950–2050 and is also extensible to a longer period. First, a description of the implementation together with a validation for the period 1950–2050 of all solar eclipse trajectories is presented. Second, the model response is analyzed in four total solar eclipse episodes. Global horizontal irradiance (GHI) outcomes are validated with respect to ground-based measurements.
Bin Zhao, Kuo-Nan Liou, Yu Gu, Cenlin He, Wee-Liang Lee, Xing Chang, Qinbin Li, Shuxiao Wang, Hsien-Liang R. Tseng, Lai-Yung R. Leung, and Jiming Hao
Atmos. Chem. Phys., 16, 5841–5852,Short summary
We examine the impact of buildings on surface solar fluxes in Beijing by accounting for their 3-D structures. We find that inclusion of buildings changes surface solar fluxes by within ±1 W m−2, ±1–10 W m−2, and up to ±100 W m−2 at grid resolutions of 4 km, 800 m, and 90 m, respectively. We can resolve pairs of positive-negative flux deviations on different sides of buildings at ≤ 800 m resolutions. We should treat building-effect on solar fluxes differently in models with different resolutions.
Thomas Schmidt, John Kalisch, Elke Lorenz, and Detlev Heinemann
Atmos. Chem. Phys., 16, 3399–3412,Short summary
We performed an irradiance forecast experiment based on analysis of hemispheric sky images and evaluated results on a large data set of 99 pyranometers distributed over 10 × 12 km. We developed a surface irradiance retrieval from cloud information derived from the images. Very high resolution forecasts were processed up to 25 min. A main finding is that forecast skill is enhanced in complex cloud conditions leading to high variability in surface irradiance.
G. Alexandri, A. K. Georgoulias, P. Zanis, E. Katragkou, A. Tsikerdekis, K. Kourtidis, and C. Meleti
Atmos. Chem. Phys., 15, 13195–13216,Short summary
It is shown here that RegCM4 regional climate model adequately simulates surface solar radiation (SSR) over Europe but significantly over/underestimates several parameters that determine the transmission of solar radiation in the atmosphere. The agreement between RegCM4 and satellite-based SSR observations is actually a result of the conflicting effect of these parameters. We suggest that there should be a reassessment of the way these parameters are represented within this and other models.
M. E. Nicholls
Atmos. Chem. Phys., 15, 9003–9029,
H. G. Chan, M. D. King, and M. M. Frey
Atmos. Chem. Phys., 15, 7913–7927,
W.-L. Lee, Y. Gu, K. N. Liou, L. R. Leung, and H.-H. Hsu
Atmos. Chem. Phys., 15, 5405–5413,Short summary
This paper investigates 3-D mountain effects on solar flux distributions and their impact on surface hydrology over the western United States, specifically the Rocky Mountains and the Sierra Nevada, using the global CCSM4 (CAM4/CLM4) with a 0.23°×0.31° resolution for simulations over 6 years. We show that deviations in the net surface fluxes are not only affected by 3-D mountains but also influenced by feedbacks of cloud and snow in association with the long-term simulations.
C. R. MacIntosh, K. P. Shine, and W. J. Collins
Atmos. Chem. Phys., 15, 3957–3969,Short summary
This study examines quantitatively the impact of methodological choices, in particular of averaging of multi-model ensembles, on climate metrics for ozone precursors. Estimates of the standard deviation of radiative forcing (RF), global warming and temperature potential (GWP, GTP) from ensemble-mean input fields generally overestimate the true value. The multi-model average fields are appropriate for calculating mean metrics, but are not a reliable method for calculating the uncertainty.
R. Román, J. Bilbao, and A. de Miguel
Atmos. Chem. Phys., 15, 375–391,Short summary
This paper develops two models for the reconstruction of ultraviolet erythemal radiation (UVER). The models are based on shortwave radiation (SW) and sunshine duration measurements. Both models are used to reconstruct UVER irradiation at nine Spanish places from 1950 to 2011. The trends of UVER are calculated at different periods. UVER presented a brightening phenomenon, but not dimming, due to the ozone depletion until the mid-1990s.
P. Huszar, T. Halenka, M. Belda, M. Zak, K. Sindelarova, and J. Miksovsky
Atmos. Chem. Phys., 14, 12393–12413,Short summary
The impact of cities and urban surfaces on climate of central Europe is examined using a regional climate model coupled to a single-layer urban canopy model. Results show a significant impact on temperature (up to 1.5K increase in summer), the boundary layer height, surface wind with a winter decrease and precipitation (a summer decrease). Applying the urban canopy model, the regional climate model exhibits a decreased model bias when compared to observations.
T. Fauchez, C. Cornet, F Szczap, P. Dubuisson, and T. Rosambert
Atmos. Chem. Phys., 14, 5599–5615,
T. Koenigk, A. Devasthale, and K.-G. Karlsson
Atmos. Chem. Phys., 14, 1987–1998,
K. N. Liou, Y. Gu, L. R. Leung, W. L. Lee, and R. G. Fovell
Atmos. Chem. Phys., 13, 11709–11721,
R. M. Bright and M. M. Kvalevåg
Atmos. Chem. Phys., 13, 11169–11174,
X.-Z. Liang and F. Zhang
Atmos. Chem. Phys., 13, 8335–8364,
L. Zhang, Q. B. Li, Y. Gu, K. N. Liou, and B. Meland
Atmos. Chem. Phys., 13, 7097–7114,
R. Zhang, D. A. Hegg, J. Huang, and Q. Fu
Atmos. Chem. Phys., 13, 6091–6099,
C. Spyrou, G. Kallos, C. Mitsakou, P. Athanasiadis, C. Kalogeri, and M. J. Iacono
Atmos. Chem. Phys., 13, 5489–5504,
Y. Gu, K. N. Liou, W.-L. Lee, and L. R. Leung
Atmos. Chem. Phys., 12, 9965–9976,
A. J. Baran, J.-F. Gayet, and V. Shcherbakov
Atmos. Chem. Phys., 12, 9355–9364,
L. Oreopoulos, D. Lee, Y. C. Sud, and M. J. Suarez
Atmos. Chem. Phys., 12, 9097–9111,
P. Pandey, K. De Ridder, D. Gillotay, and N. P. M. van Lipzig
Atmos. Chem. Phys., 12, 7961–7975,
R. R. De León, M. Krämer, D. S. Lee, and J. C. Thelen
Atmos. Chem. Phys., 12, 7893–7901,
S. Watanabe, T. Takemura, K. Sudo, T. Yokohata, and H. Kawase
Atmos. Chem. Phys., 12, 5249–5257,
Alados, I., Foyo-Moreno, I., Olmo, F. J., and Alados-Arboledas, L.: Estimation of photosynthetically active radiation under cloudy conditions, Agr. Forest Meteorol., 102, 39–50, 2000.
Arola, A., Lakkala, K., Bais, A., Kaurola, J., Meleti, C., and Taalas, P.: Factors affecting short- and long-term changes of spectral UV irradiance at two European stations, J. Geophys. Res., 108, 4549, https://doi.org/10.1029/2003JD003447, 2003.
Badarinath, K. V., Kharol, S. K., Kaskaoutis, D. G., and Kambezidis, H. D.: Case study of a dust storm over Hyderabad area, India: its impact on solar radiation using satellite data and ground measurements, Sci. Total Environ., 384, 316–332, 2007.
Bais, A. F., Tourpali, K., Kazantzidis, A., Akiyoshi, H., Bekki, S., Braesicke, P., Chipperfield, M. P., Dameris, M., Eyring, V., Garny, H., Iachetti, D., Jöckel, P., Kubin, A., Langematz, U., Mancini, E., Michou, M., Morgenstern, O., Nakamura, T., Newman, P. A., Pitari, G., Plummer, D. A., Rozanov, E., Shepherd, T. G., Shibata, K., Tian, W., and Yamashita, Y.: Projections of UV radiation changes in the 21st century: impact of ozone recovery and cloud effects, Atmos. Chem. Phys., 11, 7533–7545, https://doi.org/10.5194/acp-11-7533-2011, 2011.
Boland, J., Scott, L., and Luther, M.: Modelling the diffuse fraction of global solar radiation on a horizontal surface, Environmetrics, 12, 103–116, 2001.
Boland, J., Ridley, B., and Brown, B.: Models of diffuse solar radiation, Renew. Energ., 33, 575–584, 2008.
Calbó, J., Pages, D., and González, J. A.: Empirical studies of cloud effects on UV radiation: a review, Rev. Geophys., 43, RG2002, https://doi.org/10.1029/2004RG000155, 2005.
CIE: Erythema reference action spectrum and standard erythema dose, Vienna, ISO 17166:1999/CIE S007-1998, 1998.
DeLand, M. T. and Cebula, R. P.: Solar UV variations during the decline of cycle 23, J. Atmos. Sol.-Terr. Phy., 77, 225–234, https://doi.org/10.1016/j.jastp.2012.01.007, 2012.
de Miguel, A., Bilbao, J., Aguilar, R., Kambezidis, H. D., and Negro, E.: Diffuse solar irradiation model evaluation in the north Mediterranean belt area, Sol. Energy, 70, 143–153, 2001.
den Outer, P. N., Slaper, H., and Tax, R. B.: UV radiation in the Netherlands: assessing long-term variability and trends in relation to ozone and clouds, J. Geophys. Res., 110, D02203, https://doi.org/10.1029/2004JD004824, 2005.
Diffey, B. L.: Climate change, ozone depletion and the impact on ultraviolet exposure of human skin, Phys. Med. Biol., 49, 1–11, 2004.
Engerer, N. A.: Minute resolution estimates of the diffuse fraction of global irradiance for southeastern Australia, Sol. Energy, 116, 215–237, 2015.
Erbs, D., Klein, S. A., and Duffie, J. A.: Estimation of the diffuse radiation fraction for hourly, daily and monthly average global radiation, Sol. Energy, 28, 293–302, 1982.
Esteve, A. R., Marín, M. J., Tena, F., Utrillas, M. P., and Martínez-Lozano, J. A.: The influence of cloudiness over the values of UVER in Valencia, Spain, Int. J. Climatol., 30, 127–136, https://doi.org/10.1002/joc.1883, 2010.
Glerup, H., Mikkelsen, K., Poulsen, L., Hass, E., Overbeck, S., and Thomsen, J.: Commonly recommended daily intake of vitamin D is not sufficient if sunlight exposure is limited, J. Intern. Med., 247, 260–268, 2000.
Floyd, L. E., Prinz, D. K., Crane, P. C., and Herring, L. C.: Solar UV irradiance variation during cycles 22 and 23, Adv. Space Res., 29, 1957–1962, 2002.
Gonzalez, J. A. and Calbo, J.: Influence of the global radiation variability on the hourly diffuse fraction correlations, Sol. Energy, 65, 119–131, 1999.
Grant, R. H. and Gao, W.: Diffuse fraction of UV radiation under partly cloudy skies as defined by the Automated Surface Observation System (ASOS), J. Geophys. Res., 108, 4046, https://doi.org/10.1029/2002JD002201, 2003.
Gröbner, J., Hülsen, G., Vuilleumier, L., Blumthaler, M., Vilaplana, J. M., Walker, D., and Gil, J. E.: Report of the PMOD/WRC-COST Calibration and Intercomparison of Erythemal radiometers, available at: http://www.pmodwrc.ch/wcc_uv/pdf/ReportCOST726.pdf (last access: 24 October 2017), 109 pp., 2009.
Gueymard, C. A. and Ruiz-Arias, J. A.: Extensive worldwide validation and climate sensitivity analysis of direct irradiance predictions from 1 min global irradiance, Sol. Energy, 128, 1–30, 2016.
Häder, D. P., Helbling, E. W., Williamson, C. E., and Worrest, R. C.: Effects of UV radiation on aquatic ecosystems and interactions with climate change, Photoch. Photobio. Sci., 10, 242–260, 2011.
Häder, D. P., Williamson, C. E., Wängberg, S. Ä., Rautio, M., Rose, K. C., Gao, K., Helbling, E. W., Sinha, R. P., and Worrest, R. C.: Effects of UV radiation on aquatic ecosystems and interactions with other environmental factors, Photoch. Photobio. Sci., 14, 108–126, 2015.
Herman, J. R.: Global increase in UV irradiance during the past 30 years (1979–2008) estimated from satellite data, J. Geophys. Res., 115, D04203, https://doi.org/10.1029/2009JD012219, 2010.
Heisler, G. M.: Urban forest influence on exposure to UV radiation and potential consequences for human health, in: UV Radiation in Global Climate Change. Measurements, Modeling and Effects on Ecosystems, edited by: Gao, W. Slusser, J. R., and Schmoldt, D. L., Tsinghua University Press, Beijing, 331–369, 2010.
Holick, M. F.: Vitamin D: importance in the prevention of cancers, type 1 diabetes, heart disease and osteoposoris, Am. J. Clin. Nutr., 79, 362–371, 2004.
Hülsen, G. and Gröbner, J.: Characterization and calibration of ultraviolet broadband radiometers measuring erythemally weighted irradiance, Appl. Optics, 46, 5877–5886, 2007.
Ineichen, P., Gremaud, J. M., Guisan, O., and Mermoud, A.: Study of the corrective factor involved when measuring the diffuse solar radiation by use of the ring method, Sol. Energy, 32, 585–590, https://doi.org/10.1016/0038-092X(84)90133-6, 1984.
Iqbal, M.: Prediction of hourly diffuse solar radiation from measured hourly global radiation on horizontal surface, Sol. Energy, 24, 491–503, 1980.
Iqbal, M.: An Introduction to Solar Radiation, Academic Press, Ontario, Canada, 1983.
Iziomon, M. G. and Aro, T. O.: The diffuse fraction of global solar irradiance at a tropical location, Theor. Appl. Climatol., 61, 77–84, 1998.
Johnson, B. W. and McIntyre, R.: Analysis of test methods for UV durability predictions of polymer coatings, Prog. Org. Coat., 27, 95–106, 1996.
Kasten, F. and Young, A. T.: Revised optical air mass tables and approximatio formula, Appl. Optics, 28, 4735–4738, 1989.
Kopp, G. and Lean, J. L.: A new, lower value of total solar irradiance: evidence and climate significance, Geophys. Res. Lett., 38, L01706, https://doi.org/10.1029/2010GL045777, 2011.
Krzyścin, J. W., Sobolewski, P. S., Jarosławski, J., Podgórski, J., and Rajewska-Więch, B.: Erythemal UV observations at Belsk, Poland, in the period 1976–2008: Data homogenization, climatology, and trends, Acta Geophys., 59, 155–182, 2011.
Kudish, A. I., Harari, M., and Evseev, E. G.: The solar ultraviolet B radiation protection provided by shading devices with regard to its diffuse component, Photodermatol. Photo., 27, 236–244, 2011.
Kuo, C. W., Chang, W. C., and Chang, K. C.: Modeling the hourly solar diffuse fraction in Taiwan, Renew. Energ., 66, 56–61, 2014.
Lean, J., VanHoosier, M., Brueckner, G., Prinz, D., Floyd, L., and Edlow, K.: SUSIM∕UARS observations of the 120 to 300 nm flux variations during the maximum of the solar cycle: inference for the 11 year cycle, Geophys. Res. Lett., 19, 2203–2206, 1992.
Lesser, M. P. and Farrell, J. H.: Exposure to solar radiation increases damage to both host tissues and algal symbionts of corals during thermal stress, Coral Reefs, 23, 367–377, 2004.
Liu, B. Y. H. and Jordan, R. C.: The inter-relationship and characteristic distribution of direct, diffuse and total solar radiation, Sol. Energy, 4, 1–19, 1960.
Madronich, S. and Flocke, S.: Theoretical estimation of biologically effective UV radiation at the Earth's surface, in Solar Ultraviolet Radiation: Modeling, Measurements, and Effects, NATO ASI Ser., vol. I52, edited by: Zerefos, C., Springer-Verlag, New York, 1997.
Mayer, B. and Kylling, A.: Technical note: The libRadtran software package for radiative transfer calculations - description and examples of use, Atmos. Chem. Phys., 5, 1855–1877, https://doi.org/10.5194/acp-5-1855-2005, 2005.
McKenzie, R. L., Aucamp, P. J., Bais, A. F., Björn, L. O., and Ilyas, M.: Changes in biologically-active ultraviolet radiation reaching the Earth's surface, Photoch. Photobio. Sci., 6, 218–231, 2007.
McKinlay, A. F. and Diffey, B. L.: Human Exposure to Ultraviolet Radiation: Risks and Regulations, edited by: Passchier, W. F. and Bosnajakovic, B. F. M., Elsevier, Amsterdam, 83–87, 1987.
Meloni, D., di Sarra, A., Pace, G., and Monteleone, F.: Aerosol optical properties at Lampedusa (Central Mediterranean). 2. Determination of single scattering albedo at two wavelengths for different aerosol types, Atmos. Chem. Phys., 6, 715–727, https://doi.org/10.5194/acp-6-715-2006, 2006.
Nuñez, M., Utrillas, M. P., and Martinez-Lozano, J. A.: Approaches to partitioning the global UVER irradiance into its direct and diffuse components in Valencia, Spain, J. Geophys. Res., 117, D02204, https://doi.org/10.1029/2011JD016087, 2012.
Obregón, M. A., Pereira, S., Wagner, F., Serrano, A., Cancillo, M. L., and Silva, A. M.: Regional differences of column aerosol parameters in western Iberian Peninsula, Atmos. Environ., 12, 1–10, 2012.
Orgill, J. F. and Hollands, K. G. T.: Correlation equation for hourly diffuse radiation on a horizontal surface, Sol. Energy, 19, 357–359, 1977.
Parisi, A. V., Kimlin, M. G., Wong, J. C. F., and Wilson, M.: Diffuse component of solar ultraviolet radiation in tree shade, J. Photoch. Photobio. B, 54, 116–120, 2000.
Reindl, D. T., Beckman, W. A., and Duffie, J. A.: Diffuse fraction correlations, Sol. Energy, 45, 1–7, 1990.
Ricchiazzi, P., Yang, S., Gautier, C., and Sowle, D.: SBDART: a research and teaching sortware tool for plane-parallel radiative transfer in the Earth's atmosphere, B. Am. Meteorol. Soc., 79, 2101–2114, 1998.
Ridley, B., Boland, J., and Lauret, P.: Modelling of diffuse solar fraction with multiple predictors, Renew. Energ., 35, 478–483, 2010.
Román, R., Bilbao, J., and de Miguel, A.: Erythemal ultraviolet irradiation trends in the Iberian Peninsula from 1950 to 2011, Atmos. Chem. Phys., 15, 375–391, https://doi.org/10.5194/acp-15-375-2015, 2015.
Ruiz-Arias, J. A., Alsamamra, H., Tovar-Pescador, J., and Pozo-Vazquez, D.: Proposal of a regressive model for the hourly diffuse solar radiation under all sky conditions, Energ. Convers. Manage., 51, 881–893, 2010.
Silva, A. A.: The diffuse component of erythemal ultraviolet radiation, Photoch. Photobio. Sci., 14, 1941–1951, 2015.
Skartveit, A. and Olseth, J. A.: A model for the diffuse fraction of hourly global radiation, Sol. Energy, 38, 271–274, 1987.
Smedley, A. R. D., Rimmer, J. S., Moore, D., Toumi, R., and Webb, A. R.: Total ozone and surface UV trends in the UK: 1979–2008, Int. J. Climatol., 32, 338–346, 2012.
Spencer, J. W.: Fourier series representation of the position of the sun, Search, 2, 162–172, 1971.
Taylor, K. E.: Summarizing multiple aspects of model performance in a single diagram, J. Geophys. Res., 106, 7183–7192, 2001.
Utrillas, M. P., M. J. Marín, Esteve, A. R., Tena, F., Cañada, J., Estellés, V., and Martínez-Lozano, J. A.: Diffuse UV erythemal radiation experimental values, J. Geophys. Res., 112, D24207, https://doi.org/10.1029/2007JD008846, 2007.
Utrillas, M. P., Martınez-Lozano, J. A., and Nuñez, M.: Ultraviolet radiation protection by a beach umbrella, Photochem. Photobiol., 86, 449–456, 2010.
Verbeek, C. J. R., Hick, T., and Langdon, A.: Degradation as a result of UV radiation of bloodmeal-based thermoplastics, Polym. Degrad. Stabil., 96, 515–522, 2011.
Vilaplana, J. M., Serrano, A., Antón, M., Cancillo, M. L., Parias, M., Gröbner, J., Hülsen, G., Zablocky, G., Díaz, A., and de la Morena, B. A.: COST Action 726 – Report of the “El Arenosillo”/INTA-COST calibration and intercomparison campaign of UVER broadband radiometers. Edited by: Universidad de Extremadura-AIRE Research Group, Badajoz (Spain) and Instituto Nacional de Técnica Aeroespacial-“El Arenosillo” Observatory, Huelva (Spain), ISBN: 978-84-692-2640-7, 2009.
Webb, A. R., Kline, L., and Holick, M. F., Influence of season and latitude on the cutaneous synthesis of Vitamin D3: exposure to winter sunlight in Boston and Edmonton will not promote Vitamin D3 synthesis in human skin, J. Clin. Endocr. Metab., 67, 373–378, 1988.
Webb, A., Gröbner J., and Blumthaler, M.: A practical guide to operating broadband instruments measuring erythemally weighted irradiance, Produced by the join efforts of WMO SAG UV and Working Group 4 of the COST-726 Action: Long Term Changes and Climatology of the UV Radiation over Europe, vol. EUR 22595/WMO, 2006.
Williamson, C. E., Zepp, R. G., Lucas, R. M., Madronich, S., Austin, A. T., Ballaré, C. L., Norval, M., Sulzberger, B., Bais, A. F., McKenzie, R. L., Robinson, S. A., Häder, D. P., Paul, N. D., and Bornman, J. F.: Solar ultraviolet radiation in a changing climate, Nat. Clim. Change, 4, 434–441, 2014.
Yeo, K. L., Ball, W. T., Krivova, N. A., Solaki, S. K., Unruh, Y. C., and Morrill, J.: UV solar irradiance in observations and the NRLSSI and SATIRE-S models, J. Geophys. Res.-Space, 120, 6055–6070, https://doi.org/10.1002/2015JA021277, 2015.
Zerefos, C. S., Tourpali, K., Eleftheratos, K., Kazadzis, S., Meleti, C., Feister, U., Koskela, T., and Heikkilä, A.: Evidence of a possible turning point in solar UV-B over Canada, Europe and Japan, Atmos. Chem. Phys., 12, 2469–2477, https://doi.org/10.5194/acp-12-2469-2012, 2012.
Zepp, R. G., Shank, G. C., Stabenau, E., Patterson, K. W., Cyterski, M., Fisher, W., Bartels, E., and Anderson, S. L.: Spatial and temporal variability of solar ultraviolet exposure of coral assemblages in the Florida Keys: Importance of colored dissolved organic matter, Limnol. Oceanogr., 53, 1909–1922, https://doi.org/10.4319/lo.2008.53.5.1909, 2008.
This study proposes models to estimate the UVER diffuse irradiance, which means, at least, 40 % of the ultraviolet solar radiation reaching the Earth's surface at mid-latitudes. These models are inspired by expressions originally used to estimate total diffuse fraction and rely on variables commonly available to favor their applicability. The best model in this paper performs better than previous approaches and no additional information about the cloud or aerosol layer is needed.
This study proposes models to estimate the UVER diffuse irradiance, which means, at least, 40 %...