Multi-scale Interaction Underlying the 2022 Concurrent Extreme Precipitation in Pakistan and Mega Heatwave in Yangtze River Valley

Multi-scale Interaction Underlying the 2022 Concurrent Extreme Precipitation in Pakistan and Mega Heatwave in Yangtze River Valley | 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 Multi-scale Interaction Underlying the 2022 Concurrent Extreme Precipitation in Pakistan and Mega Heatwave in Yangtze River Valley Qianrong Ma, Yingxiao Sun, Rui Hu, zhiwei zhu, Kaiguo Xiong, Hao Wu, and 2 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4284741/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 03 Aug, 2024 Read the published version in npj Climate and Atmospheric Science → Version 1 posted 11 You are reading this latest preprint version Abstract Unprecedentedly extreme precipitation occurred in Pakistan (PAK), and mega heat waves persisted along the Yangtze River Valley (YRV) from July to August 2022. Using the advanced multiscale window transform-based canonical transfer attribution framework, we quantitatively delineated multi-scale and inter-scale interactions leading to record-breaking spatially concurrent extremes in 2022 and comprehensively revealed differences in dynamic processes affecting extreme events in July and August. The quasi-stationary window lost the available potential energy (APE), and through APE canonical transfers to the intraseasonal-scale and synoptic-scale windows, the inter-scale dynamic processes and barotropic instability of the basic-scale preserved the concurrent extreme in July. In August, the eruptive high-frequency-scale kinetic energy convergence provided dynamic conditions for the sinking motion of the YRV and its advection to PAK from the Indian Ocean. Consequently, the interaction between high- and low-frequency processes drove atmospheric circulation in summer, but the high-frequency process in August played a vital role in extreme events. Additionally, the heat source in the tropical western-central Pacific is considered one of the key drivers for localized repetitive bursts of energy. This study emphasizes both the interactions between multiple scales of atmospheric dynamics and revealing the driving mechanisms behind the impacts of warming on extreme events, linking the external forcing issue with the free problem of atmospheric internal instability. Full Text Additional Declarations (Not answered) Supplementary Files SI.docx Cite Share Download PDF Status: Published Journal Publication published 03 Aug, 2024 Read the published version in npj Climate and Atmospheric Science → Version 1 posted Editorial decision: revise 23 May, 2024 Review # 1 received at journal 22 May, 2024 Review # 3 received at journal 18 May, 2024 Review # 2 received at journal 16 May, 2024 Reviewer # 3 agreed at journal 30 Apr, 2024 Reviewer # 2 agreed at journal 27 Apr, 2024 Reviewer # 1 agreed at journal 26 Apr, 2024 Reviewers invited by journal 26 Apr, 2024 Editor assigned by journal 19 Apr, 2024 Submission checks completed at journal 18 Apr, 2024 First submitted to journal 17 Apr, 2024 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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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-4284741","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":295852574,"identity":"5d8d6988-1bb3-4e61-a5fe-33ef59fa17e3","order_by":0,"name":"Qianrong 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Using the advanced multiscale window transform-based canonical transfer attribution framework, we quantitatively delineated multi-scale and inter-scale interactions leading to record-breaking spatially concurrent extremes in 2022 and comprehensively revealed differences in dynamic processes affecting extreme events in July and August. The quasi-stationary window lost the available potential energy (APE), and through APE canonical transfers to the intraseasonal-scale and synoptic-scale windows, the inter-scale dynamic processes and barotropic instability of the basic-scale preserved the concurrent extreme in July. In August, the eruptive high-frequency-scale kinetic energy convergence provided dynamic conditions for the sinking motion of the YRV and its advection to PAK from the Indian Ocean. Consequently, the interaction between high- and low-frequency processes drove atmospheric circulation in summer, but the high-frequency process in August played a vital role in extreme events. 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