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Adv."],"published-print":{"date-parts":[[2026,10,23]]},"abstract":"<jats:p>Marine heatwaves (MHWs) are devastating extreme ocean temperature events whose frequency and severity have surged under global warming, threatening marine ecosystems and fisheries. Yet, the fundamental mechanisms that control their intensity and persistence remain incompletely understood. Here, using a submesoscale-permitting global model simulation validated by long-term observational and reanalysis data, this study reveals a previously overlooked submesoscale feedback that exerts a critical control on MHW severity. It is demonstrated that the submesoscale-induced vertical heat flux suppresses the intensity and persistence of atmosphere-driven MHWs in winter via a negative feedback mechanism. Enhanced air-sea net heat flux strengthens stratification and shoals the mixed layer, weakening submesoscale vertical heat transport by 19.4%, reducing MHW intensification by 18.1%, and accelerating decay by 21.7%. This missing regulatory mechanism indicates that models ignoring the submesoscale feedback likely overestimate MHW severity, with critical implications for future climate projections.<\/jats:p>","DOI":"10.1126\/sciadv.aei4624","type":"journal-article","created":{"date-parts":[[2026,10,21]],"date-time":"2026-10-21T18:01:42Z","timestamp":1792605702000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":0,"title":["Submesoscale feedback suppresses marine heatwaves"],"prefix":"10.1126","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1926-0414","authenticated-orcid":true,"given":"Jihai","family":"Dong","sequence":"first","affiliation":[{"name":"State Key Laboratory of Climate System Prediction and Risk Management, Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China."},{"name":"School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China."},{"name":"State Key Laboratory of Severe Weather Meteorological Science and Technology (LaSW), Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing, China."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7426-3175","authenticated-orcid":true,"given":"Wenjin","family":"Sun","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Climate System Prediction and Risk Management, Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China."},{"name":"School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2871-2048","authenticated-orcid":true,"given":"Baylor","family":"Fox-Kemper","sequence":"additional","affiliation":[{"name":"Department of Earth, Environmental, and Planetary Sciences, Brown University, Providence, RI, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4251-562X","authenticated-orcid":true,"given":"Zhiyou","family":"Jing","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanography, Chinese Academy of Sciences, Guangzhou, Guangdong, China."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1517-7602","authenticated-orcid":true,"given":"Changming","family":"Dong","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Climate System Prediction and Risk Management, Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China."},{"name":"School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China."}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"221","reference":[{"key":"e_1_3_2_2_2","unstructured":"A. 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