{"id":1118,"date":"2023-07-03T01:43:21","date_gmt":"2023-07-03T00:43:21","guid":{"rendered":"https:\/\/research.reading.ac.uk\/s2s-summit2023\/?page_id=1118"},"modified":"2023-07-03T01:46:21","modified_gmt":"2023-07-03T00:46:21","slug":"abstract204","status":"publish","type":"page","link":"https:\/\/research.reading.ac.uk\/s2s-summit2023\/programme\/abstract204\/","title":{"rendered":"Abstract 204"},"content":{"rendered":"

[vc_row][vc_column][vc_column_text]Abstract ID:<\/strong> 204<\/p>\n

Extreme rainfall events over the French tropical overseas territories : characteristics and atmospheric forcing provided by equatorial waves<\/h2>\n

Lead Author:<\/strong> Erwan Cornillault
\nCRNM, France
\n<\/span><\/p>\n

Keywords:<\/strong> Extreme events, Convectively-coupled equatorial waves, Cluster analysis, French overseas<\/p>\n

Abstract: <\/strong>Because they can lead to floods, landslides or rockfalls, extreme rainfall events are often associated with heavy human and economic loss. The early forecast of these high-impact weather events is thus critical for efficient early warning systems. The large-scale atmospheric configurations related to such events have been widely documented over the mid-latitudes. But more studies are needed about those leading to their occurrence over the tropics. In particular, a few case studies emphasised the possible role of convectively-coupled equatorial waves, the major tropical synoptic systems. Still, it remains to be shown that their part is genuinely systematic.
\nThe present study documents the atmospheric configurations leading to extreme rainfall events over the French overseas territories distributed along the tropical belt (Indian Ocean, Western and Central Pacific, and Caribbean Sea). Such documentation should provide a basis to understand better the processes at play in tropical extreme rainfall events. This study also helps to identify large-scale conditions prone to their occurrence and thereby provides further guidance for their improved and earlier forecast, especially at the sub-seasonal timescale.<\/p>\n

Using the M\u00e9t\u00e9o-France rain gauge network, which provides long-term daily rainfall time series over the French overseas territories, we characterise the properties of extreme rainfall events over these regions, namely their intensity, spatial variability and seasonality. We also assess the contribution of tropical storms and cyclones to their occurrence. Then, hierarchical clustering is used to identify rain gauges consistent in terms of extreme rainfall event occurrence. The composite large-scale atmospheric conditions are finally analysed for each rain gauge cluster, focusing on equatorial waves based on appropriate space-time filtering. We illustrate our approach for La R\u00e9union Island, before evaluating how the results over this area are relevant for the other French tropical regions.<\/p>\n

Finally, the potential predictability of the identified atmospheric drivers, with current sub-seasonal forecast systems, is also discussed.<\/p>\n

Co-authors:
\n<\/strong>PEYRILLE Philippe (CNRM, France)
\nCOUVREUX Fleur (CNRM, France)
\nROEHRIG Romain (CNRM, France)[\/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: 204 Extreme rainfall events over the French tropical overseas territories : characteristics and atmospheric forcing provided by equatorial waves Lead Author: Erwan Cornillault CRNM, France Keywords: Extreme events,…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-1118","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"\nAbstract 204 - 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\/abstract204\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Abstract 204 - 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