{"id":665,"date":"2023-07-02T17:47:55","date_gmt":"2023-07-02T16:47:55","guid":{"rendered":"https:\/\/research.reading.ac.uk\/s2s-summit2023\/?page_id=665"},"modified":"2023-07-02T17:47:55","modified_gmt":"2023-07-02T16:47:55","slug":"abstract006","status":"publish","type":"page","link":"https:\/\/research.reading.ac.uk\/s2s-summit2023\/programme\/abstract006\/","title":{"rendered":"Abstract 006"},"content":{"rendered":"

[vc_row][vc_column][vc_column_text]Abstract ID:<\/strong> 006<\/p>\n

Subseasonal variability of the warm Arctic \u2013 cold North American pattern<\/h2>\n

Lead Author:<\/strong> Hai Lin
\nEnvironment and Climate Change Canada, Canada
\n<\/span><\/p>\n

Keywords:<\/strong> Subseasonal variability, Surface temperature, Teleconnections, Warm Arctic \u2013 Cold Continent pattern, Predictability<\/p>\n

Abstract:<\/strong> Near surface air temperature variability over the North American sector displays a \u201cWarm Arctic \u2013 Cold Continent\u201d pattern (WACC) known as the Warm Arctic \u2013 Cold North America (WACNA). The WACNA is characterized by a pair of opposite surface air temperature anomalies over the high-latitude Chukchi-Bering Sea region and the North American continent. On the other hand, over the Eurasian sector the WACC pattern is denoted as Warm Arctic\u2013Cold Eurasia (WACE). The WACC pattern has often been associated with the connection between Arctic sea ice reduction and cold weather over the middle latitude continents. Whether the existence of this pattern is due to variability of sea ice or is caused by atmospheric internal dynamics is subject to debate. In this study, we examine the variability of WACNA on the subseasonal time scale. It is found that a negative phase of WACE tends to lead a positive phase of the WACNA pattern by about 2 weeks. The WACNA pattern develops by interacting with the time-mean flow and synoptic-scale transient eddies. Two pathways of Rossby wave propagation are associated with WACNA. The northern pathway originates from eastern Siberia moving eastward across the Bering Strait to Canada, and the southern pathway is rooted in the subtropical waveguide propagating across the eastern North Pacific. The anomalous warm advection from the North Pacific and cold advection from the Arctic that follow the circulation anomalies lead to the development of the positive WACNA pattern. Our analysis suggests that tropospheric dynamics alone can generate the WACNA, and if its variability is essentially attributable to internal dynamics the predictability associated with this pattern is probably limited.<\/p>\n

Co-authors:
\n<\/strong>Bin Yu (Environment and Climate Change Canada, Canada)
\nNicholas Hall (University of Toulouse, 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: 006 Subseasonal variability of the warm Arctic \u2013 cold North American pattern Lead Author: Hai Lin Environment and Climate Change Canada, Canada Keywords: Subseasonal variability, Surface temperature, Teleconnections,…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-665","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"\nAbstract 006 - 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\/abstract006\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Abstract 006 - 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