{"id":1125,"date":"2023-07-03T02:01:07","date_gmt":"2023-07-03T01:01:07","guid":{"rendered":"https:\/\/research.reading.ac.uk\/s2s-summit2023\/?page_id=1125"},"modified":"2023-07-03T02:01:07","modified_gmt":"2023-07-03T01:01:07","slug":"abstract214","status":"publish","type":"page","link":"https:\/\/research.reading.ac.uk\/s2s-summit2023\/programme\/abstract214\/","title":{"rendered":"Abstract 214"},"content":{"rendered":"

[vc_row][vc_column][vc_column_text]Abstract ID:<\/strong> 214<\/p>\n

Multiple tropical waves occurrence drive extreme precipitation events in the central Sahel<\/h2>\n

Lead Author:<\/strong> Philippe Peyrille
\nCNRM, Meteo-France, France
\n<\/span><\/p>\n

Keywords:<\/strong> extreme, precipitation, Sahel, tropical, waves<\/p>\n

Abstract:<\/strong> Atmospheric conditions leading to extreme precipitation events (EPE) in the Central Sahel are examined at subseasonal timescale with a focus on tropical waves. EPE are first detected using a dense rain-gauge network over Burkina Faso, which corresponds to a significant part of the central Sahel. A composite analysis reveals that a high humidity associated with a large-scale humid envelope, anomalous divergence in the upper troposphere and a strong layer-averaged relative vorticity are key elements at play in the occurrence of an EPE. The multiple occurrence of tropical waves is found to be a key driver of such an atmospheric environment. The occurrence of very intense regional synoptic disturbance \u2013 so-called African Easterly Waves \u2013 with a marked vorticity and humidity anomaly together with a larger-scale Equatorial Rossby wave is the dominant factor in most of the EPE cases. The occurrence of multiple tropical waves in their convectively phases is a key feature of EPE, not found for less intense precipitation events, that provide a favorable preconditioning for an intense EPEs that point to an increased predictability in Sahel and potentially in other semi-arid regions. An example of operational use of this scenario will we shown on the 2022 monsoon season.<\/p>\n

Co-authors:
\n<\/strong>Romain Roehrig (CNRM, Meteo-France)
\nSidiki Sanogo (IPSL)[\/vc_column_text][vc_separator][\/vc_column][\/vc_row][vc_row][vc_column width=”1\/6″][vc_single_image image=”344″ img_size=”full” onclick=”custom_link” link=”http:\/\/s2sprediction.net\/”][\/vc_column][vc_column width=”1\/6″][vc_single_image image=”345″ img_size=”full” onclick=”custom_link” link=”https:\/\/public.wmo.int\/en”][\/vc_column][vc_column width=”1\/6″][vc_single_image image=”346″ img_size=”full” onclick=”custom_link” link=”https:\/\/community.wmo.int\/activity-areas\/wwrp”][\/vc_column][vc_column width=”1\/6″][vc_single_image image=”347″ img_size=”full” onclick=”custom_link” link=”https:\/\/www.wcrp-climate.org\/”][\/vc_column][vc_column width=”1\/6″][vc_single_image image=”348″ img_size=”full”][\/vc_column][vc_column width=”1\/6″][vc_single_image image=”349″ img_size=”full” onclick=”custom_link” link=”https:\/\/www.reading.ac.uk\/”][\/vc_column][\/vc_row]<\/p>\n","protected":false},"excerpt":{"rendered":"

[vc_row][vc_column][vc_column_text]Abstract ID: 214 Multiple tropical waves occurrence drive extreme precipitation events in the central Sahel Lead Author: Philippe Peyrille CNRM, Meteo-France, France Keywords: extreme, precipitation, Sahel, tropical, waves Abstract: Atmospheric…Read More ><\/a><\/p>\n","protected":false},"author":145,"featured_media":0,"parent":528,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"__cvm_playback_settings":[],"__cvm_video_id":"","footnotes":""},"coauthors":[13],"class_list":["post-1125","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"\nAbstract 214 - WWRP\/WCRP S2S Summit 2023<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/research.reading.ac.uk\/s2s-summit2023\/programme\/abstract214\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Abstract 214 - 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