Oceanic Forcing on Interannual Variability of Sahel Heavy and Moderate Daily Rainfall
This article analyzes SST remote forcing on the interannual variability of Sahel summer (June–September) moderate (below 75th percentile) and heavy (above 75th percentile) daily precipitation events during the period 1981–2016. Evidence is given that interannual variability of these events is marked...
Published in: | Journal of Hydrometeorology |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2019
|
Subjects: | |
Online Access: | https://oa.upm.es/77649/ |
id |
ftunivpmadrid:oai:oa.upm.es:77649 |
---|---|
record_format |
openpolar |
spelling |
ftunivpmadrid:oai:oa.upm.es:77649 2024-02-27T08:43:30+00:00 Oceanic Forcing on Interannual Variability of Sahel Heavy and Moderate Daily Rainfall Diakhaté, M. Rodríguez Fonseca, B. Gómara Cardalliaguet, Iñigo Mohino, E. Dieng, A. L. Gaye, A. T. 2019-03-01 application/pdf https://oa.upm.es/77649/ eng eng https://journals.ametsoc.org/view/journals/hydr/20/3/jhm-d-18-0035_1.xml info:eu-repo/grantAgreement/MINECO//CGL2017-86415-R info:eu-repo/grantAgreement/EC/FP7/603521 info:eu-repo/grantAgreement/MINECO//FJCI-2015-23874 info:eu-repo/semantics/altIdentifier/doi/10.1175/JHM-D-18-0035.1 https://oa.upm.es/77649/ https://creativecommons.org/licenses/by-nc-nd/3.0/es/ info:eu-repo/semantics/openAccess Journal of Hydrometeorology, 2019-03-01, Vol. 20, No. 3 Física Medio Ambiente info:eu-repo/semantics/article Artículo PeerReviewed 2019 ftunivpmadrid https://doi.org/10.1175/JHM-D-18-0035.1 2024-01-31T00:14:57Z This article analyzes SST remote forcing on the interannual variability of Sahel summer (June–September) moderate (below 75th percentile) and heavy (above 75th percentile) daily precipitation events during the period 1981–2016. Evidence is given that interannual variability of these events is markedly different. The occurrence of moderate daily rainfall events appears to be enhanced by positive SST anomalies over the tropical North Atlantic and Mediterranean, which act to increase low-level moisture advection toward the Sahel from the equatorial and north tropical Atlantic (the opposite holds for negative SSTs anomalies). In contrast, heavy and extreme daily rainfall events seem to be linked to El Niño–Southern Oscillation (ENSO) and Mediterranean variability. Under La Niña conditions and a warmer Mediterranean, vertical atmospheric instability is increased over the Sahel and low-level moisture supply from the equatorial Atlantic is enhanced over the area (the reverse is found for opposite-sign SST anomalies). Further evidence suggests that interannual variability of Sahel rainfall is mainly dominated by the extreme events. These results have implications for seasonal forecasting of Sahel moderate and heavy precipitation events based on SST predictors, as significant predictability is found from 1 to 4 months in advance. Article in Journal/Newspaper North Atlantic Archivo Digital UPM (Universidad Politécnica de Madrid) Journal of Hydrometeorology 20 3 397 410 |
institution |
Open Polar |
collection |
Archivo Digital UPM (Universidad Politécnica de Madrid) |
op_collection_id |
ftunivpmadrid |
language |
English |
topic |
Física Medio Ambiente |
spellingShingle |
Física Medio Ambiente Diakhaté, M. Rodríguez Fonseca, B. Gómara Cardalliaguet, Iñigo Mohino, E. Dieng, A. L. Gaye, A. T. Oceanic Forcing on Interannual Variability of Sahel Heavy and Moderate Daily Rainfall |
topic_facet |
Física Medio Ambiente |
description |
This article analyzes SST remote forcing on the interannual variability of Sahel summer (June–September) moderate (below 75th percentile) and heavy (above 75th percentile) daily precipitation events during the period 1981–2016. Evidence is given that interannual variability of these events is markedly different. The occurrence of moderate daily rainfall events appears to be enhanced by positive SST anomalies over the tropical North Atlantic and Mediterranean, which act to increase low-level moisture advection toward the Sahel from the equatorial and north tropical Atlantic (the opposite holds for negative SSTs anomalies). In contrast, heavy and extreme daily rainfall events seem to be linked to El Niño–Southern Oscillation (ENSO) and Mediterranean variability. Under La Niña conditions and a warmer Mediterranean, vertical atmospheric instability is increased over the Sahel and low-level moisture supply from the equatorial Atlantic is enhanced over the area (the reverse is found for opposite-sign SST anomalies). Further evidence suggests that interannual variability of Sahel rainfall is mainly dominated by the extreme events. These results have implications for seasonal forecasting of Sahel moderate and heavy precipitation events based on SST predictors, as significant predictability is found from 1 to 4 months in advance. |
format |
Article in Journal/Newspaper |
author |
Diakhaté, M. Rodríguez Fonseca, B. Gómara Cardalliaguet, Iñigo Mohino, E. Dieng, A. L. Gaye, A. T. |
author_facet |
Diakhaté, M. Rodríguez Fonseca, B. Gómara Cardalliaguet, Iñigo Mohino, E. Dieng, A. L. Gaye, A. T. |
author_sort |
Diakhaté, M. |
title |
Oceanic Forcing on Interannual Variability of Sahel Heavy and Moderate Daily Rainfall |
title_short |
Oceanic Forcing on Interannual Variability of Sahel Heavy and Moderate Daily Rainfall |
title_full |
Oceanic Forcing on Interannual Variability of Sahel Heavy and Moderate Daily Rainfall |
title_fullStr |
Oceanic Forcing on Interannual Variability of Sahel Heavy and Moderate Daily Rainfall |
title_full_unstemmed |
Oceanic Forcing on Interannual Variability of Sahel Heavy and Moderate Daily Rainfall |
title_sort |
oceanic forcing on interannual variability of sahel heavy and moderate daily rainfall |
publishDate |
2019 |
url |
https://oa.upm.es/77649/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Journal of Hydrometeorology, 2019-03-01, Vol. 20, No. 3 |
op_relation |
https://journals.ametsoc.org/view/journals/hydr/20/3/jhm-d-18-0035_1.xml info:eu-repo/grantAgreement/MINECO//CGL2017-86415-R info:eu-repo/grantAgreement/EC/FP7/603521 info:eu-repo/grantAgreement/MINECO//FJCI-2015-23874 info:eu-repo/semantics/altIdentifier/doi/10.1175/JHM-D-18-0035.1 https://oa.upm.es/77649/ |
op_rights |
https://creativecommons.org/licenses/by-nc-nd/3.0/es/ info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1175/JHM-D-18-0035.1 |
container_title |
Journal of Hydrometeorology |
container_volume |
20 |
container_issue |
3 |
container_start_page |
397 |
op_container_end_page |
410 |
_version_ |
1792051505324359680 |