نتایج جستجو برای: sahel

تعداد نتایج: 1478  

Journal: :Sustainability 2022

The G5 Sahel works in collaboration with various international organizations and countries, which are responsible for managing logistics activities, financial flows, technological solutions. Humanitarian assistance holds a critically important role the region, despite its multiple challenges limitations macroeconomic development. This research aimed to examine macrologistics potential of humani...

Journal: :Ardea 2023

Every year, hundreds of millions migratory birds cross the Sahara to spend northern winter in Sahel. After their arrival September region does not receive any rainfall until June while temperatures increase. Birds inhabiting Sahel have several strategies cope with this seasonal advent drought. Most ground-foraging and arboreal migrants actually remain desiccating Sahel, although Northern Wheate...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2009
Isla S Castañeda Stefan Mulitza Enno Schefuss Raquel A Lopes dos Santos Jaap S Sinninghe Damsté Stefan Schouten

The carbon isotopic composition of individual plant leaf waxes (a proxy for C(3) vs. C(4) vegetation) in a marine sediment core collected from beneath the plume of Sahara-derived dust in northwest Africa reveals three periods during the past 192,000 years when the central Sahara/Sahel contained C(3) plants (likely trees), indicating substantially wetter conditions than at present. Our data sugg...

Journal: :Journal of Applied Meteorology 1997

Journal: :Éducation relative à l'environnement 2000

Journal: :Ardea 2023

Arboreal birds in the Sahel are highly selective their tree choice. Most migrant, but also resident, found a few species and within those often only trees with abundant leaves flowers. For this reason alone, preferred were expected to teem birds. This was not case. bird present as singletons, even half of Senegal Eremomela pusilla – most social all recorded solitary The probability that two dif...

Journal: :Atmospheric Chemistry and Physics 2022

Abstract. African mineral dust is transported many thousands of kilometres from its source regions, and, because ability to nucleate ice, it plays a major role in cloud glaciation around the globe. The ice-nucleating activity desert influenced by mineralogy, which varies substantially between regions and across particle sizes. However, models often assumed that (expressed as active sites per un...

Journal: :Journal of Hydrology 2021

Despite the long-lasting and widespread drought in Sahel, flood events did punctuate past. The concern about floods remains dwarf on international research policy agenda compared to droughts. In this paper, we elucidate that Sahel are now becoming more frequent, widespread, devastating. We analyzed gridded daily rainfall data over period 1981–2020, used photographs satellite images depict areas...

Journal: :Geophysical Research Letters 2015

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