Evidence of Long-Term Trend of Visibility in the Sahel and Coevolution with Meteorological Conditions and Vegetation Cover during the Recent Period

Siélé Silué; Touré E. N’Datchoh; Arona Diedhiou; Emmanuel Quansah; Madina Doumbia

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Evidence of Long-Term Trend of Visibility in the Sahel and Coevolution with Meteorological Conditions and Vegetation Cover during the Recent Period

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In this study, the long term trend of the observed visibility data used directly (without conversion into dust concentrations) over Sahel was investigated between 1957 and 2013. Then, to review the influence of atmospheric factors and land surface conditions on this trend, the coevolution between the visibility and the dust surface mass concentration from MERRA-2 (Modern-Era Retrospective analysis for Research and Applications) reanalysis, the in-situ surface meteorological data (rainfall, relative humidity, wind speed, and air temperature), as well as the Normalized Difference Vegetation Index (NDVI) were analyzed from 2000 to 2013. We showed that the horizontal visibility has significantly decreased since the 1970s. The coevolution between the visibility and the dust surface mass concentration revealed that visibility decreased significantly with increments in dust concentrations. Visibility increases with rainfall and relative humidity. It is greater in areas of high vegetation cover than in deforested areas. Visibility is weakly correlated with wind speed and air temperature but generally, wind leads to a decrease in visibility, while warm air temperature is associated with a clearer sky and hence, high visibility. The worst visibility in the dry season results from high dust concentrations due to warm and dry wind conditions and less vegetation cover. Rainfall, relative humidity and vegetation cover are the dominant factors contributing to the decrease of dust loading in the Sahel.

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《大气和气候科学（英文）》 |2019年第3期|346-368|共23页
作者
Siélé Silué; Touré E. N’Datchoh; Arona Diedhiou; Emmanuel Quansah; Madina Doumbia;
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作者单位

Université Peleforo Gon Coulibaly;

Korhogo;

Cô

te d’Ivoire;

LAPA-MF;

Université Félix Houphouë

t-Boigny;

Abidjan;

Cô

te d’Ivoire;

IGE;

CNRS Grenoble INP;

IRD;

Université Grenoble Alpes;

Grenoble;

France;

Kwame Nkrumah University of Science and Technology;

Kumasi;

Ghana;

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原文格式 PDF
正文语种 chi
中图分类大气科学（气象学）;
关键词
Visibility; Dust; Climate; Vegetation; Sahel;

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Evidence of Long-Term Trend of Visibility in the Sahel and Coevolution with Meteorological Conditions and Vegetation Cover during the Recent Period

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