Tropical and mid-latitude causal drivers of the eastern Mediterranean Etesians during boreal summer

Tropical and mid-latitude causal drivers of the eastern Mediterranean Etesians during boreal summer | 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 Research Article Tropical and mid-latitude causal drivers of the eastern Mediterranean Etesians during boreal summer Giorgia Di Capua, Evangelos Tyrlis, Daniela Matei, Reik V. Donner This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-3903453/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 31 Aug, 2024 Read the published version in Climate Dynamics → Version 1 posted 3 You are reading this latest preprint version Abstract During boreal summer, large scale subsidence and a persistent northerly flow, known as the Etesians, characterize the tropospheric circulation over the eastern Mediterranean. The Etesians bring clear skies and alleviate the impact of heat waves over the region. The intraseasonal variability of the Etesians and subsidence over the eastern Mediterranean has been thought to be influenced by the South Asian Monsoon and atmospheric processes over the North Atlantic. Here, we employ causal effect networks and causal maps, obtained by applying the Peter and Clark Momentary Conditional Independence (PCMCI) causal discovery algorithm, to identify causal precursors of Etesians. We find that both wave train activity over the North Atlantic/North American region and convective activity over South Asia associated with the Indian summer monsoon (ISM) are causally related to the Etesians at 3-day time scale. Thus, intraseasonal ISM variability affects the eastern Mediterranean circulation, though its influence is conveyed via a Middle East ridge. On longer weekly time scale, the mid-latitude influence weakens, while the influence of the tropical convective activity via the Middle East ridge remains stable. Moreover, the heat low over the Arabian Peninsula, a feature strongly responsible for the development of the Etesians, is caused by a stronger Middle East ridge and not by North Atlantic wave activity. Finally, we discuss potential implication for circulation changes in the eastern Mediterranean due to anthropogenic global warming. Indian monsoon Mediterranean Etesians mid-latitude wave train Full Text Supplementary Files SIDiCapuaetalEMEDv4.pdf Cite Share Download PDF Status: Published Journal Publication published 31 Aug, 2024 Read the published version in Climate Dynamics → Version 1 posted Reviewers agreed at journal 19 Feb, 2024 Reviewers invited by journal 18 Feb, 2024 First submitted to journal 26 Jan, 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. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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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-3903453","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":273641120,"identity":"6d3ca42b-5a17-4e48-ad68-b3e92f1ee1d5","order_by":0,"name":"Giorgia Di Capua","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA90lEQVRIiWNgGAWjYDCCwxBKjoGZDSpyAIh5iNBiDNViQISWAxAqsYGBWC18x5kffi5ss0vfzs6WwFxQ8cee7/jpBIY3Fbi1SB5mM5ae2Zacu7OZ7QDzjDMGiTPP5G5gnHMGtxaDwzwM0rxtzLkbDrO3/+ZtM0gwOJC7gZm3Da8WZqDK+nSDw+wNQJUG9gbn3wK1/MOrhQ1oy+EEg8NAhwG1MG64AbKlAa9fzKxnnDtuCPRLAtAvxokzb7zdcHDOMdxa+M4ffny7oKxa3pz/mAEwxOTs+c7nbnzwpga3FhBgBrsQxgCBA/g1YNMyCkbBKBgFowAZAADQoFCoizVhdAAAAABJRU5ErkJggg==","orcid":"https://orcid.org/0000-0002-7302-6522","institution":"Potsdam-Institut fur Klimafolgenforschung eV","correspondingAuthor":true,"prefix":"","firstName":"Giorgia","middleName":"Di","lastName":"Capua","suffix":""},{"id":273641121,"identity":"9fa6e3e3-976f-476d-8492-2530f95670f1","order_by":1,"name":"Evangelos Tyrlis","email":"","orcid":"","institution":"National and Kapodistrian University of Athens Department of Physics: Ethniko kai Kapodistriako Panepistemio Athenon Tmema Physikes","correspondingAuthor":false,"prefix":"","firstName":"Evangelos","middleName":"","lastName":"Tyrlis","suffix":""},{"id":273641122,"identity":"547b9250-7eb0-41c7-8d48-cf59ef9a7987","order_by":2,"name":"Daniela Matei","email":"","orcid":"","institution":"Max Planck Institute for Meteorology: Max-Planck-Institut fur Meteorologie","correspondingAuthor":false,"prefix":"","firstName":"Daniela","middleName":"","lastName":"Matei","suffix":""},{"id":273641123,"identity":"9caedb57-fbd9-4323-b3e0-10ea55625b06","order_by":3,"name":"Reik V. 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