Global warming induced hybrid rainy seasons in the Sahel
The small rainfall recovery observed over the Sahel, concomitant with a regional climate warming, conceals some drought features that exacerbate food security. The new rainfall features include false start and early cessation of rainy seasons, increased frequency of intense daily rainfall, increasin...
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ftdoajarticles:oai:doaj.org/article:93bf8dcbe08a46139bad082061a30b96 2023-09-05T13:21:35+02:00 Global warming induced hybrid rainy seasons in the Sahel Seyni Salack Cornelia Klein Alessandra Giannini Benoit Sarr Omonlola N Worou Nouhoun Belko Jan Bliefernicht Harald Kunstman 2016-01-01T00:00:00Z https://doi.org/10.1088/1748-9326/11/10/104008 https://doaj.org/article/93bf8dcbe08a46139bad082061a30b96 EN eng IOP Publishing https://doi.org/10.1088/1748-9326/11/10/104008 https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/11/10/104008 1748-9326 https://doaj.org/article/93bf8dcbe08a46139bad082061a30b96 Environmental Research Letters, Vol 11, Iss 10, p 104008 (2016) hybrid season drought thresholds agroclimatic monitoring Sahel global warming 92.70.Aa Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 article 2016 ftdoajarticles https://doi.org/10.1088/1748-9326/11/10/104008 2023-08-13T00:37:54Z The small rainfall recovery observed over the Sahel, concomitant with a regional climate warming, conceals some drought features that exacerbate food security. The new rainfall features include false start and early cessation of rainy seasons, increased frequency of intense daily rainfall, increasing number of hot nights and warm days and a decreasing trend in diurnal temperature range. Here, we explain these mixed dry/wet seasonal rainfall features which are called hybrid rainy seasons by delving into observed data consensus on the reduction in rainfall amount, its spatial coverage, timing and erratic distribution of events, and other atmospheric variables crucial in agro-climatic monitoring and seasonal forecasting. Further composite investigations of seasonal droughts, oceans warming and the regional atmospheric circulation nexus reveal that the low-to-mid-level atmospheric winds pattern, often stationary relative to either strong or neutral El-Niño-Southern-Oscillations drought patterns, associates to basin warmings in the North Atlantic and the Mediterranean Sea to trigger hybrid rainy seasons in the Sahel. More challenging to rain-fed farming systems, our results suggest that these new rainfall conditions will most likely be sustained by global warming, reshaping thereby our understanding of food insecurity in this region. Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Environmental Research Letters 11 10 104008 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
hybrid season drought thresholds agroclimatic monitoring Sahel global warming 92.70.Aa Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
spellingShingle |
hybrid season drought thresholds agroclimatic monitoring Sahel global warming 92.70.Aa Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 Seyni Salack Cornelia Klein Alessandra Giannini Benoit Sarr Omonlola N Worou Nouhoun Belko Jan Bliefernicht Harald Kunstman Global warming induced hybrid rainy seasons in the Sahel |
topic_facet |
hybrid season drought thresholds agroclimatic monitoring Sahel global warming 92.70.Aa Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
description |
The small rainfall recovery observed over the Sahel, concomitant with a regional climate warming, conceals some drought features that exacerbate food security. The new rainfall features include false start and early cessation of rainy seasons, increased frequency of intense daily rainfall, increasing number of hot nights and warm days and a decreasing trend in diurnal temperature range. Here, we explain these mixed dry/wet seasonal rainfall features which are called hybrid rainy seasons by delving into observed data consensus on the reduction in rainfall amount, its spatial coverage, timing and erratic distribution of events, and other atmospheric variables crucial in agro-climatic monitoring and seasonal forecasting. Further composite investigations of seasonal droughts, oceans warming and the regional atmospheric circulation nexus reveal that the low-to-mid-level atmospheric winds pattern, often stationary relative to either strong or neutral El-Niño-Southern-Oscillations drought patterns, associates to basin warmings in the North Atlantic and the Mediterranean Sea to trigger hybrid rainy seasons in the Sahel. More challenging to rain-fed farming systems, our results suggest that these new rainfall conditions will most likely be sustained by global warming, reshaping thereby our understanding of food insecurity in this region. |
format |
Article in Journal/Newspaper |
author |
Seyni Salack Cornelia Klein Alessandra Giannini Benoit Sarr Omonlola N Worou Nouhoun Belko Jan Bliefernicht Harald Kunstman |
author_facet |
Seyni Salack Cornelia Klein Alessandra Giannini Benoit Sarr Omonlola N Worou Nouhoun Belko Jan Bliefernicht Harald Kunstman |
author_sort |
Seyni Salack |
title |
Global warming induced hybrid rainy seasons in the Sahel |
title_short |
Global warming induced hybrid rainy seasons in the Sahel |
title_full |
Global warming induced hybrid rainy seasons in the Sahel |
title_fullStr |
Global warming induced hybrid rainy seasons in the Sahel |
title_full_unstemmed |
Global warming induced hybrid rainy seasons in the Sahel |
title_sort |
global warming induced hybrid rainy seasons in the sahel |
publisher |
IOP Publishing |
publishDate |
2016 |
url |
https://doi.org/10.1088/1748-9326/11/10/104008 https://doaj.org/article/93bf8dcbe08a46139bad082061a30b96 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Environmental Research Letters, Vol 11, Iss 10, p 104008 (2016) |
op_relation |
https://doi.org/10.1088/1748-9326/11/10/104008 https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/11/10/104008 1748-9326 https://doaj.org/article/93bf8dcbe08a46139bad082061a30b96 |
op_doi |
https://doi.org/10.1088/1748-9326/11/10/104008 |
container_title |
Environmental Research Letters |
container_volume |
11 |
container_issue |
10 |
container_start_page |
104008 |
_version_ |
1776202187468177408 |