Thermal acclimation dampens the warming-induced increase in ecosystem respiration | 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 Physical Sciences - Article Thermal acclimation dampens the warming-induced increase in ecosystem respiration Junna Wang, David Reed, Aimee Classen, Alexander Knohl, Andrej Varlagin, and 34 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-5718150/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted You are reading this latest preprint version Abstract Global warming increases ecosystem respiration (ER), creating a positive carbon-climate feedback. Thermal acclimation, the direct responses of biological communities to reduce the effects of temperature changes on respiration rates, is a critical mechanism that compensates for warming-induced ER increases and dampens this positive feedback. However, the extent and effects of this mechanism across diverse ecosystems remain unclear. By analyzing CO2 flux data from 93 eddy covariance sites worldwide, we observed thermal acclimation at 84 % of the sites. If sustained, thermal acclimation could reduce projected warming-induced nighttime ER increases by at least 25 % across most climate zones by 2041-2060. Strong thermal acclimation is particularly evident in ecosystems at high elevation, with low-carbon-content soils, and within tundra, semi-arid, and warm-summer Mediterranean climates, supporting the hypothesis that extreme environments favor the evolution of greater acclimation potential. Moreover, ecosystems with dense vegetation and high productivity such as humid tropical and subtropical forests generally exhibit strong thermal acclimation, suggesting that regions with substantial CO2 uptake may continue to serve as strong carbon sinks. Conversely, some ecosystems in cold continental climates show signs of enhancing thermal responses, the opposite of thermal acclimation, which could exacerbate carbon losses as climate warms. Our study underscores the widespread yet climate-specific patterns of thermal acclimation in global terrestrial ER, emphasizing the need to incorporate these patterns into Earth System Models for more accurate carbon-climate feedback projections. Earth and environmental sciences/Ecology/Climate-change ecology Earth and environmental sciences/Ecology/Ecosystem ecology terrestrial carbon sinks carbon-climate feedback thermal adaptation eddy covariance FLUXNET Full Text Additional Declarations There is NO Competing Interest. Supplementary Files Supplementaryinformation.docx Cite Share Download PDF Status: Under Review 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. 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. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. 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-5718150","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Physical Sciences - Article","associatedPublications":[],"authors":[{"id":400113781,"identity":"16543275-4761-46b9-8b91-d46a50d2c5af","order_by":0,"name":"Junna Wang","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA50lEQVRIiWNgGAWjYBACxgY4k/kAA0MBiJFAtBY2oFIDIrQgAR4D4rQwz8g99uAHw2F5c/413yR+GNgw8LPnGOB32Iy8dMMehsOGO2e83SbZY5DGINnzhpCWHDMJHobbjBtunN0mwWNwmMHgBkFbcswk/zDctt9w48wzyT8G/xnsidEiDbQlccP5HjZpHoMDDAYShLT0vDGTljH4n7zhBpuxtYxBMo/EmWcFeLUYtgMd9qYizXbD+cMPb76psJPjb0/egF9LA4gEuUQigUUCSPHgVQ4C8nAW/wHmDwSVj4JRMApGwYgEAGu8RfWms+r6AAAAAElFTkSuQmCC","orcid":"","institution":"Yale University","correspondingAuthor":true,"prefix":"","firstName":"Junna","middleName":"","lastName":"Wang","suffix":""},{"id":400113782,"identity":"dc8d1d6c-9624-4532-9c1c-1cac19f09ec0","order_by":1,"name":"David Reed","email":"","orcid":"","institution":"Yale University","correspondingAuthor":false,"prefix":"","firstName":"David","middleName":"","lastName":"Reed","suffix":""},{"id":400113783,"identity":"bfc3ce0b-5fff-4da9-a426-fb89e0de8803","order_by":2,"name":"Aimee Classen","email":"","orcid":"https://orcid.org/0000-0002-6741-3470","institution":"University of Michigan","correspondingAuthor":false,"prefix":"","firstName":"Aimee","middleName":"","lastName":"Classen","suffix":""},{"id":400113784,"identity":"bc314606-2e9c-416a-83a2-5188ff6bb2f3","order_by":3,"name":"Alexander Knohl","email":"","orcid":"https://orcid.org/0000-0002-7615-8870","institution":"University of Goettingen","correspondingAuthor":false,"prefix":"","firstName":"Alexander","middleName":"","lastName":"Knohl","suffix":""},{"id":400113785,"identity":"5c8ef87c-8ece-4f56-be9d-de2726d0e14f","order_by":4,"name":"Andrej Varlagin","email":"","orcid":"https://orcid.org/0000-0002-2549-5236","institution":"A.N. 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