Long‐term variations of circulation in the tropical Atlantic sector and Sahel rainfall
Abstract Following diagnostic work two decades ago, this study examines the long‐term variations of rainfall in the West African Sahel and the underlying circulation mechanisms over the past century. Raingauge measurements bear out DRY regimes during 1910–1919 and 1979–1988 and WET regimes during 19...
Published in: | International Journal of Climatology |
---|---|
Main Authors: | , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2011
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1002/joc.2116 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.2116 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.2116 |
id |
crwiley:10.1002/joc.2116 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1002/joc.2116 2024-09-15T18:21:14+00:00 Long‐term variations of circulation in the tropical Atlantic sector and Sahel rainfall Hastenrath, Stefan Polzin, Dierk Variability of Tropical Climate Fund of the University of Wisconsin Foundation 2011 http://dx.doi.org/10.1002/joc.2116 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.2116 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.2116 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor International Journal of Climatology volume 31, issue 5, page 649-655 ISSN 0899-8418 1097-0088 journal-article 2011 crwiley https://doi.org/10.1002/joc.2116 2024-08-06T04:15:05Z Abstract Following diagnostic work two decades ago, this study examines the long‐term variations of rainfall in the West African Sahel and the underlying circulation mechanisms over the past century. Raingauge measurements bear out DRY regimes during 1910–1919 and 1979–1988 and WET regimes during 1950–1959 and 1999–2008. In the WET as compared to the DRY regimes the cross‐equatorial winds from the Southern Hemisphere are enhanced, consistent with lower surface pressure over the tropical North Atlantic, which in terms of hydrostatic forcing plausibly accompanies warmer surface waters, with cooling/warming leading pressure rise/drop in the tropical North Atlantic and DRY/WET in the Sahel. The controls of the observed long‐term variations of sea surface temperature in the tropical North Atlantic must remain target of further diagnostic evaluation. Copyright © 2010 Royal Meteorological Society Article in Journal/Newspaper North Atlantic Wiley Online Library International Journal of Climatology 31 5 649 655 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract Following diagnostic work two decades ago, this study examines the long‐term variations of rainfall in the West African Sahel and the underlying circulation mechanisms over the past century. Raingauge measurements bear out DRY regimes during 1910–1919 and 1979–1988 and WET regimes during 1950–1959 and 1999–2008. In the WET as compared to the DRY regimes the cross‐equatorial winds from the Southern Hemisphere are enhanced, consistent with lower surface pressure over the tropical North Atlantic, which in terms of hydrostatic forcing plausibly accompanies warmer surface waters, with cooling/warming leading pressure rise/drop in the tropical North Atlantic and DRY/WET in the Sahel. The controls of the observed long‐term variations of sea surface temperature in the tropical North Atlantic must remain target of further diagnostic evaluation. Copyright © 2010 Royal Meteorological Society |
author2 |
Variability of Tropical Climate Fund of the University of Wisconsin Foundation |
format |
Article in Journal/Newspaper |
author |
Hastenrath, Stefan Polzin, Dierk |
spellingShingle |
Hastenrath, Stefan Polzin, Dierk Long‐term variations of circulation in the tropical Atlantic sector and Sahel rainfall |
author_facet |
Hastenrath, Stefan Polzin, Dierk |
author_sort |
Hastenrath, Stefan |
title |
Long‐term variations of circulation in the tropical Atlantic sector and Sahel rainfall |
title_short |
Long‐term variations of circulation in the tropical Atlantic sector and Sahel rainfall |
title_full |
Long‐term variations of circulation in the tropical Atlantic sector and Sahel rainfall |
title_fullStr |
Long‐term variations of circulation in the tropical Atlantic sector and Sahel rainfall |
title_full_unstemmed |
Long‐term variations of circulation in the tropical Atlantic sector and Sahel rainfall |
title_sort |
long‐term variations of circulation in the tropical atlantic sector and sahel rainfall |
publisher |
Wiley |
publishDate |
2011 |
url |
http://dx.doi.org/10.1002/joc.2116 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.2116 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.2116 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
International Journal of Climatology volume 31, issue 5, page 649-655 ISSN 0899-8418 1097-0088 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/joc.2116 |
container_title |
International Journal of Climatology |
container_volume |
31 |
container_issue |
5 |
container_start_page |
649 |
op_container_end_page |
655 |
_version_ |
1810459702913400832 |