Articles | Volume 22, issue 18
https://doi.org/10.5194/acp-22-12241-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-22-12241-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
20 Sep 2022
Research article |
| 20 Sep 2022
| 20 Sep 2022
Life cycle of stratocumulus clouds over 1 year at the coast of the Atacama Desert
Inst. for Geophysics and Meteorology, University of Cologne, Cologne, Germany
Camilo del Rio
Inst. de Geografia Pontificia, Universidad Católica de Chile, Santiago, Chile
Centro UC Desierto de Atacama, Pontificia Universidad Católica de Chile, Santiago, Chile
Juan-Luis García
Inst. de Geografia Pontificia, Universidad Católica de Chile, Santiago, Chile
Centro UC Desierto de Atacama, Pontificia Universidad Católica de Chile, Santiago, Chile
Pablo Osses
Inst. de Geografia Pontificia, Universidad Católica de Chile, Santiago, Chile
Centro UC Desierto de Atacama, Pontificia Universidad Católica de Chile, Santiago, Chile
Sarah Westbrook
Inst. for Geophysics and Meteorology, University of Cologne, Cologne, Germany
Ulrich Löhnert
Inst. for Geophysics and Meteorology, University of Cologne, Cologne, Germany
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Robin Schweikert, Ron Eric Stein, Neil Bogs, Olaf Bubenzer, Camilo del Río, Dörte Harpke, Simon Matthias May, Alexander Siegmund, Alexandra Stoll, Dietmar Quandt, and Marcus A. Koch
EGUsphere, https://doi.org/10.64898/2026.02.23.707457, https://doi.org/10.64898/2026.02.23.707457, 2026
This preprint is open for discussion and under review for Biogeosciences (BG).
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We exemplify unimodal regional wind systems facilitating sand transport toward Tillandsiales. Tillandsiales show a low-energy wind system allowing sand accumulation of predominant grain sizes available at each site. Thereby Tillandsia landbeckii modifies and maintains its own microenvironment. Genomic data reveal high clonality and excess of heterozygosity promoting fitness in a hyperarid environment, and abiotic factors drive the selection of diverse and adaptive Tillandsia phenotypes.
Marcus G. Müller, Birger Bohn, and Ulrich Löhnert
EGUsphere, https://doi.org/10.5194/egusphere-2026-131, https://doi.org/10.5194/egusphere-2026-131, 2026
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We present an uncertainty estimation for the retrieval of aerosol properties from a Vaisala CT25k ceilometer at JOYCE (Jülich Observatory for Cloud Evolution) with a forward inversion method. Ceilometer aerosol mass concentrations and extinction coefficients were compared to in situ observations (optical particle sizer) from a close-by tower at 120 m, showing a mean absolute percentage error of 39 % when deriving aerosol mass concentrations from ceilometer aerosol extinction coefficients.
Tobias Böck, Moritz Löffler, Tobias Marke, Bernhard Pospichal, Christine Knist, and Ulrich Löhnert
Atmos. Meas. Tech., 18, 6251–6270, https://doi.org/10.5194/amt-18-6251-2025, https://doi.org/10.5194/amt-18-6251-2025, 2025
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We investigated how accurate modern ground-based weather sensors are in measuring temperature and humidity within the lower atmosphere. We identified different types of small but important measurement error inherent to the instruments. Understanding these issues helps improve data quality and supports better short-term weather forecasts using sensor networks across Europe.
Paolo Andreozzi, Mark D. Fielding, Robin J. Hogan, Richard M. Forbes, Samuel Rémy, Birger Bohn, and Ulrich Löhnert
EGUsphere, https://doi.org/10.5194/egusphere-2025-3790, https://doi.org/10.5194/egusphere-2025-3790, 2025
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Aerosols significantly contribute to the Earth’s climate, but models still struggle at representing them. Here we use satellite observations of clouds to improve aerosols in our weather and air-quality model. We show that African wildfires induce too bright simulated clouds and that our model removes too much aerosol from ice-containing clouds. This showcases how our approach effectively targets poorly observed aerosol processes, potentially informing weather forecasting and climate models.
Felipe Lobos-Roco, Jordi Vilà-Guerau de Arellano, and Camilo del Río
Hydrol. Earth Syst. Sci., 29, 109–125, https://doi.org/10.5194/hess-29-109-2025, https://doi.org/10.5194/hess-29-109-2025, 2025
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Water resources are fundamental for the social, economic, and natural development of (semi-)arid regions. Precipitation decreases due to climate change obligate us to find new water resources. Fog harvesting (FH) emerges as a complementary resource in regions where it is abundant but untapped. This research proposes a model to estimate FH potential in coastal (semi-)arid regions. This model could have broader applicability worldwide in regions where FH could be a viable water source.
Sabrina Schnitt, Andreas Foth, Heike Kalesse-Los, Mario Mech, Claudia Acquistapace, Friedhelm Jansen, Ulrich Löhnert, Bernhard Pospichal, Johannes Röttenbacher, Susanne Crewell, and Bjorn Stevens
Earth Syst. Sci. Data, 16, 681–700, https://doi.org/10.5194/essd-16-681-2024, https://doi.org/10.5194/essd-16-681-2024, 2024
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This publication describes the microwave radiometric measurements performed during the EUREC4A campaign at Barbados Cloud Observatory (BCO) and aboard RV Meteor and RV Maria S Merian. We present retrieved integrated water vapor (IWV), liquid water path (LWP), and temperature and humidity profiles as a unified, quality-controlled, multi-site data set on a 3 s temporal resolution for a core period between 19 January 2020 and 14 February 2020.
Tobias Böck, Bernhard Pospichal, and Ulrich Löhnert
Atmos. Meas. Tech., 17, 219–233, https://doi.org/10.5194/amt-17-219-2024, https://doi.org/10.5194/amt-17-219-2024, 2024
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In this study, measurement uncertainties from microwave radiometers and their impact on temperature profiling are analyzed. These measurement uncertainties include horizontal inhomogeneities of the atmosphere, pointing errors or tilts of the instrument, physical obstacles which are in the line of sight of the radiometer, and radio frequency interferences. Impacts on temperature profiles from these uncertainties are usually small in real-life scenarios and when obstacles are far enough away.
Paulina Grigusova, Annegret Larsen, Roland Brandl, Camilo del Río, Nina Farwig, Diana Kraus, Leandro Paulino, Patricio Pliscoff, and Jörg Bendix
Biogeosciences, 20, 3367–3394, https://doi.org/10.5194/bg-20-3367-2023, https://doi.org/10.5194/bg-20-3367-2023, 2023
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In our study, we included bioturbation into a soil erosion model and ran the model for several years under two conditions: with and without bioturbation. We validated the model using several sediment fences in the field. We estimated the modeled sediment redistribution and surface runoff and the impact of bioturbation on these along a climate gradient. Lastly, we identified environmental parameters determining the positive or negative impact of bioturbation on sediment redistribution.
Nils Eingrüber, Wolfgang Korres, Ulrich Löhnert, and Karl Schneider
Adv. Sci. Res., 20, 65–71, https://doi.org/10.5194/asr-20-65-2023, https://doi.org/10.5194/asr-20-65-2023, 2023
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Sensitivity analyses for wind direction effects upon an ENVI-met microclimate model were performed for a heterogeneous urban study area. Significant temperature differences were found when forcing the model with constant N/E/S/W wind direction data. Best model performance was observed using measured wind direction forcing data. The results demonstrate that cooling effects of park areas are largely directional which is important for urban planning and design of climate change adaptation measures.
Paulina Grigusova, Annegret Larsen, Sebastian Achilles, Roland Brandl, Camilo del Río, Nina Farwig, Diana Kraus, Leandro Paulino, Patricio Pliscoff, Kirstin Übernickel, and Jörg Bendix
Earth Surf. Dynam., 10, 1273–1301, https://doi.org/10.5194/esurf-10-1273-2022, https://doi.org/10.5194/esurf-10-1273-2022, 2022
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In our study, we developed, tested, and applied a cost-effective time-of-flight camera to autonomously monitor rainfall-driven and animal-driven sediment redistribution in areas affected by burrowing animals with high temporal (four times a day) and spatial (6 mm) resolution. We estimated the sediment redistribution rates on a burrow scale and then upscaled the redistribution rates to entire hillslopes. Our findings can be implemented into long-term soil erosion models.
Julian Steinheuer, Carola Detring, Frank Beyrich, Ulrich Löhnert, Petra Friederichs, and Stephanie Fiedler
Atmos. Meas. Tech., 15, 3243–3260, https://doi.org/10.5194/amt-15-3243-2022, https://doi.org/10.5194/amt-15-3243-2022, 2022
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Doppler wind lidars (DWLs) allow the determination of wind profiles with high vertical resolution and thus provide an alternative to meteorological towers. We address the question of whether wind gusts can be derived since they are short-lived phenomena. Therefore, we compare different DWL configurations and develop a new method applicable to all of them. A fast continuous scanning mode that completes a full observation cycle within 3.4 s is found to be the best-performing configuration.
Juan-Luis García, Christopher Lüthgens, Rodrigo M. Vega, Ángel Rodés, Andrew S. Hein, and Steven A. Binnie
E&G Quaternary Sci. J., 70, 105–128, https://doi.org/10.5194/egqsj-70-105-2021, https://doi.org/10.5194/egqsj-70-105-2021, 2021
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The Last Glacial Maximum (LGM) about 21 kyr ago is known to have been global in extent. Nonetheless, we have limited knowledge during the pre-LGM time in the southern middle latitudes. If we want to understand the causes of the ice ages, the complete glacial period must be addressed. In this paper, we show that the Patagonian Ice Sheet in southern South America reached its full glacial extent also by 57 kyr ago and defies a climate explanation.
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Short summary
Marine stratocumulus clouds of the eastern Pacific play an essential role in the Earth's climate. These clouds form the major source of water to parts of the extreme dry Atacama Desert at the northern coast of Chile. For the first time these clouds are observed over a whole year with three remote sensing instruments. It is shown how these clouds are influenced by the land–sea wind system and the distribution of ocean temperatures.
Marine stratocumulus clouds of the eastern Pacific play an essential role in the Earth's...
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