Distinct response of Asian summer monsoon rainfall during the first and third years of triple-dip La Niña events

Distinct response of Asian summer monsoon rainfall during the first and third years of triple-dip La Niña events | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Distinct response of Asian summer monsoon rainfall during the first and third years of triple-dip La Niña events Shaobo Qiao, Yihou Zhou, Bin Wang, Shankai Tang, Wenjie Dong This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8487723/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract This study investigates triple-dip La Niña events and their influence on Asian summer monsoon rainfall during the first and third years. In the first year, a significant positive rainfall anomaly extends from the Bay of Bengal to the Yangtze River Basin, concurrent with reduced rainfall over the northern Indian Peninsula and the Indochina Peninsula. This pattern largely reverses during the third year. Convergent empirical and modeling evidence reveal that the distinct rainfall responses are linked to different evolutions of the El Niño–Southern Oscillation (ENSO). In the first year, following a preceding El Niño, La Niña onset is rapid. This rapid onset strengthens the Western Pacific Subtropical High (WPSH) and a negative-phase Scandinavian pattern, which jointly shape the initial rainfall distribution. Conversely, by the third year, sustained La Niña amplifies zonal sea surface temperature (SST) gradients in the equatorial western Pacific. This shifts the WPSH northward and triggers a positive Circumglobal Teleconnection (CGT) pattern, collectively driving the reversed rainfall anomalies. Additionally, the second year exhibits relatively weak rainfall anomalies, as both the La Niña onset rate and the zonal SST gradients are near climatological normals. These results are useful for predicting Asian summer monsoon rainfall. Earth and environmental sciences/Climate sciences/Atmospheric science/Atmospheric dynamics Earth and environmental sciences/Climate sciences/Climate change/Projection and prediction Full Text Additional Declarations There is NO Competing Interest. Supplementary Files SupplementaryFigures.pdf Distinct response of Asian summer monsoon rainfall during the first and third years of triple-dip La Niña events Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. 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