Articles | Volume 14, issue 13
https://doi.org/10.5194/acp-14-6953-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/acp-14-6953-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
New spectral functions of the near-ground albedo derived from aircraft diffraction spectrometer observations
C. A. Varotsos
Climate Research Group, Division of Environmental Physics and Meteorology, Faculty of Physics, University of Athens, University Campus Bldg. Phys. V, Athens 15784, Greece
I. N. Melnikova
Laboratory for Atmospheric Physics, Research Center for Interdisciplinary Environmental Cooperation (INENCO RAS), Russian Academy of Sciences, St. Petersburg, Russia
A. P. Cracknell
Division of Electronic Engineering and Physics, University of Dundee, Dundee DD1 4HN, Scotland, UK
C. Tzanis
Climate Research Group, Division of Environmental Physics and Meteorology, Faculty of Physics, University of Athens, University Campus Bldg. Phys. V, Athens 15784, Greece
A. V. Vasilyev
Institute of Physics, St. Petersburg State University, Ulyanovskaya 1, 198504 St. Petersburg, Russia
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In this paper we present the corrosion/soiling results obtained from the analysis of different kind of materials that were exposed in Athens during the period 2003–2012. According to these results, the corrosion/soiling of the particular exposed materials tend to decrease over the years, except for the case of copper. Based on this long experimental database, applicable to multi-pollutant situation of the Athens basin, we present newly developed dose–response functions (DRFs).
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It has been recently reported that the current 2015–2016 El Niño could become "one of the strongest on record". To further explore this claim, we performed a new analysis that allows the detection of precursory signals of the strong El Niño events by using a recently developed non-linear dynamics tool. The analysis of the SOI time series shows that the 2015–2016 El Niño would be rather a "moderate to strong" or even a "strong” event and not "one of the strongest on record", as that of 1997–1998.
J. Christodoulakis, C. Varotsos, A. P. Cracknell, C. Tzanis, and A. Neofytos
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We investigated the susceptibility of the Dobson spectrophotometer No. 118 to stray-light interference. The monochromatic-heterochromatic stray light derived by Basher’s model was used in order to evaluate the specific instrumental parameters which determine if this instrument suffers from this problem or not. The results obtained indicate that the Athens Dobson instrument appears to have an insignificant stray-light error.
C. A. Varotsos, S. Lovejoy, N. V. Sarlis, C. G. Tzanis, and M. N. Efstathiou
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Stavros Papamarinopoulos, Panagiota Preka-Papadema, Konstantinos Kalachanis, Habik-Hasak Maroukian, Georgios Saraditis, Dimitrios Theodosopoulos, and Chris Tzanis
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The Argonauts’ trip along the northern limit of the Libyan Desert, from Syrtis Gulf to Tritonis Lake, is described by Apollonius Rhodes’ text ‘Argonautica’. The Argonauts sailed in this lake and located a narrow passage through which they exit to the Mediterranean’s coast.
Yidi Xu, Philippe Ciais, Le Yu, Wei Li, Xiuzhi Chen, Haicheng Zhang, Chao Yue, Kasturi Kanniah, Arthur P. Cracknell, and Peng Gong
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In this study, we implemented the specific morphology, phenology and harvest process of oil palm in the global land surface model ORCHIDEE-MICT. The improved model generally reproduces the same leaf area index, biomass density and life cycle fruit yield as observations. This explicit representation of oil palm in a global land surface model offers a useful tool for understanding the ecological processes of oil palm growth and assessing the environmental impacts of oil palm plantations.
John Christodoulakis, Chris G. Tzanis, Costas A. Varotsos, Martin Ferm, and Johan Tidblad
Atmos. Chem. Phys., 17, 439–448, https://doi.org/10.5194/acp-17-439-2017, https://doi.org/10.5194/acp-17-439-2017, 2017
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In this paper we present the corrosion/soiling results obtained from the analysis of different kind of materials that were exposed in Athens during the period 2003–2012. According to these results, the corrosion/soiling of the particular exposed materials tend to decrease over the years, except for the case of copper. Based on this long experimental database, applicable to multi-pollutant situation of the Athens basin, we present newly developed dose–response functions (DRFs).
Shaun Lovejoy and Costas Varotsos
Earth Syst. Dynam., 7, 133–150, https://doi.org/10.5194/esd-7-133-2016, https://doi.org/10.5194/esd-7-133-2016, 2016
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We compare the statistical properties of solar, volcanic and combined forcings over the range from 1 to 1000 years to see over which scale ranges they additively combine, a prediction of linear response. The main findings are (a) that the variability in the Zebiac–Cane model and GCMs are too weak at centennial and longer scales; (b) for longer than ≈ 50 years, the forcings combine subadditively; and (c) at shorter scales, strong (intermittency, e.g. volcanic) forcings are nonlinear.
Costas A. Varotsos, Chris G. Tzanis, and Nicholas V. Sarlis
Atmos. Chem. Phys., 16, 2007–2011, https://doi.org/10.5194/acp-16-2007-2016, https://doi.org/10.5194/acp-16-2007-2016, 2016
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It has been recently reported that the current 2015–2016 El Niño could become "one of the strongest on record". To further explore this claim, we performed a new analysis that allows the detection of precursory signals of the strong El Niño events by using a recently developed non-linear dynamics tool. The analysis of the SOI time series shows that the 2015–2016 El Niño would be rather a "moderate to strong" or even a "strong” event and not "one of the strongest on record", as that of 1997–1998.
J. Christodoulakis, C. Varotsos, A. P. Cracknell, C. Tzanis, and A. Neofytos
Atmos. Meas. Tech., 8, 3037–3046, https://doi.org/10.5194/amt-8-3037-2015, https://doi.org/10.5194/amt-8-3037-2015, 2015
Short summary
Short summary
We investigated the susceptibility of the Dobson spectrophotometer No. 118 to stray-light interference. The monochromatic-heterochromatic stray light derived by Basher’s model was used in order to evaluate the specific instrumental parameters which determine if this instrument suffers from this problem or not. The results obtained indicate that the Athens Dobson instrument appears to have an insignificant stray-light error.
C. A. Varotsos, S. Lovejoy, N. V. Sarlis, C. G. Tzanis, and M. N. Efstathiou
Atmos. Chem. Phys., 15, 7301–7306, https://doi.org/10.5194/acp-15-7301-2015, https://doi.org/10.5194/acp-15-7301-2015, 2015
Short summary
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Varotsos et al. (Theor. Appl. Climatol., 114, 725–727, 2013) found that the solar ultraviolet (UV) wavelengths exhibit 1/f-type power-law correlations. In this study, we show that the residues of the spectral solar incident flux with respect to the Planck law over a wider range of wavelengths (i.e. UV-visible) have a scaling regime too.
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Because of an increase in population UV exposure due to depletion of ozone, solar UV data were collected at Chilton, south England, from 1991 to 2015 and compared with ozone (O), cloudiness (C) and aerosols (A). Using multiple regression analysis, the results showed O exhibited a small increasing tendency over the same period; C played a more important role in the increasing trend in UV for 1991–2004 than O, while for 2004–2015 the decreasing trend in UV was less associated with C and A than O.
Samuel R. Hall, Kirk Ullmann, Michael J. Prather, Clare M. Flynn, Lee T. Murray, Arlene M. Fiore, Gustavo Correa, Sarah A. Strode, Stephen D. Steenrod, Jean-Francois Lamarque, Jonathan Guth, Béatrice Josse, Johannes Flemming, Vincent Huijnen, N. Luke Abraham, and Alex T. Archibald
Atmos. Chem. Phys., 18, 16809–16828, https://doi.org/10.5194/acp-18-16809-2018, https://doi.org/10.5194/acp-18-16809-2018, 2018
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Photolysis (J rates) initiates and drives atmospheric chemistry, and Js are perturbed by factors of 2 by clouds. The NASA Atmospheric Tomography (ATom) Mission provides the first comprehensive observations on how clouds perturb Js through the remote Pacific and Atlantic basins. We compare these cloud-perturbation J statistics with those from nine global chemistry models. While basic patterns agree, there is a large spread across models, and all lack some basic features of the observations.
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