Articles | Volume 11, issue 4
https://doi.org/10.5194/esd-11-1133-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/esd-11-1133-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
11 Dec 2020
Research article |
| 11 Dec 2020
| 11 Dec 2020
Daytime low-level clouds in West Africa – occurrence, associated drivers, and shortwave radiation attenuation
Derrick K. Danso
CORRESPONDING AUTHOR
Université Grenoble Alpes, IRD, CNRS, Grenoble-INP, IGE, 38000
Grenoble, France.
Laboratoire de Physique de l'Atmosphère et de Mécaniques des
Fluides (LAPAMF), Université Félix Houphoüet Boigny, Abidjan,
Côte d'Ivoire
Sandrine Anquetin
Université Grenoble Alpes, IRD, CNRS, Grenoble-INP, IGE, 38000
Grenoble, France.
Arona Diedhiou
Université Grenoble Alpes, IRD, CNRS, Grenoble-INP, IGE, 38000
Grenoble, France.
Laboratoire de Physique de l'Atmosphère et de Mécaniques des
Fluides (LAPAMF), Université Félix Houphoüet Boigny, Abidjan,
Côte d'Ivoire
Kouakou Kouadio
Laboratoire de Physique de l'Atmosphère et de Mécaniques des
Fluides (LAPAMF), Université Félix Houphoüet Boigny, Abidjan,
Côte d'Ivoire
Arsène T. Kobea
Laboratoire de Physique de l'Atmosphère et de Mécaniques des
Fluides (LAPAMF), Université Félix Houphoüet Boigny, Abidjan,
Côte d'Ivoire
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My early experience inspired me to write this paper because I was always curious about the reasons behind the frequent landslides that occurred in the area where I was born. Now, my dream has come true because this study was centered on the same region, same people, and because I discovered the causes and preventative measures for landslides in my area. I hope that when establishing policies for disaster management in the study area, decision-makers will take these results into consideration.
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We present the database of Historical Impacts of Floods in the Arve Valley (HIFAVa). It reports flood occurrences and impacts (1850–2015) in a French Alpine catchment. Our results show an increasing occurrence of impacts from 1920 onwards, which is more likely related to indirect source effects and/or increasing exposure rather than hydrological changes. The analysis reveals that small mountain streams caused more impacts (67 %) than the main river.
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This study aims to analyse the frequency, intensity and duration of extreme climate events in order to optimise sugarcane production in the Ferkessédougou sugar complexes. This study could enable the Ferkessédougou sugar complexes managers to develop strategies for adaptation to climate change.
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The study investigates precipitation changes in the Alps, using observations and a 7 km resolution climate simulation over 1900–2010. An increase in mean precipitation is found in winter over the Alps, whereas a drying occurred in summer in the surrounding plains. A general increase in the daily annual maximum of precipitation is evidenced (20 to 40 % per century), suggesting an increase in extreme events that is significant only when considering long time series, typically 50 to 80 years.
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Short summary
The atmospheric and surface conditions that exist during the occurrence of daytime low-level clouds (LLCs) and their influence on solar radiation were investigated in West Africa. During the monsoon season, these LLCs are linked to high moisture flux driven by strong southwesterly winds from the Gulf of Guinea and significant background moisture levels. Their occurrence leads to a strong reduction in the incoming solar radiation and has large impacts on the surface energy budget.
The atmospheric and surface conditions that exist during the occurrence of daytime low-level...
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