Atmospheric feedbacks reverse the sensitivity of modeled photosynthesis to stomatal function

Atmospheric feedbacks reverse the sensitivity of modeled photosynthesis to stomatal function | Authorea try { document.documentElement.classList.add('js'); } catch (e) { } var _gaq = _gaq || []; _gaq.push(['_setAccount', 'G-8VDV14Y67G']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Skip to main content Preprints Collections Wiley Open Research IET Open Research Ecological Society of Japan All Collections About About Authorea FAQs Contact Us Quick Search anywhere Search for preprint articles, keywords, etc. Search Search ADVANCED SEARCH SCROLL This is a preprint and has not been peer reviewed. Data may be preliminary. 21 April 2025 V3 Latest version Share on Atmospheric feedbacks reverse the sensitivity of modeled photosynthesis to stomatal function Authors : Amy X. Liu [email protected] , Claire M. Zarakas 0000-0001-9992-3785 , Benjamin G. Buchovecky 0009-0006-3022-4488 , Linnia R. Hawkins , Alana S. Cordak , Ashley E. Cornish , Marja Haagsma 0000-0002-1777-7284 , … Show All … , Gabriel J. Kooperman 0000-0002-3174-4913 , Christopher J. Still 0000-0002-8295-4494 , Charles D. Koven 0000-0002-3367-0065 , Alexander J. Turner 0000-0003-1406-7372 , David S. Battisti 0000-0003-4871-1293 , James T. Randerson 0000-0001-6559-7387 , Forrest M. Hoffman 0000-0001-5802-4134 , and Abigail L.S. Swann 0000-0001-8513-1074 Show Fewer Authors Info & Affiliations https://doi.org/10.22541/au.172867674.41108945/v3 Published Journal of Advances in Modeling Earth Systems Version of record Peer review timeline 712 views 279 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract Stomata on leaves mediate fluxes of carbon and water between terrestrial plants and the atmosphere. These fluxes are governed by stomatal function and can be modulated in many Earth system models (ESMs) by an empirical parameter within the calculation of stomatal conductance, the stomatal slope ( g 1M ). Intuitively, g 1M represents the marginal water cost of carbon, relating it to the emergent plant property of water use efficiency. Observations show that g 1M can range widely across and within plant types in varying environments, and this distribution of g 1M is not captured within ESMs which represent each plant type with a single g 1M value. Here we examine how g 1M influences photosynthesis using coupled ESM simulations by perturbing g 1M to observed 5th and 95th percentiles for each plant type. We find that high g 1M reduces photosynthesis nearly everywhere, while low g 1M has regionally dependent responses. Under fixed atmospheric conditions, low g 1M increases photosynthesis in the Amazon and central North America but decreases photosynthesis in boreal Canada. These responses reverse when the atmosphere responds interactively due to spatially differing sensitivity to increases in temperature and vapor pressure deficit. Stomatal function also influences photosynthetic response to changes in atmospheric carbon dioxide (CO 2 ), with lower and higher g 1M modifying total global response to elevated 2x preindustrial CO 2 by 6.4% and -9.6%, respectively. Our work demonstrates that atmospheric feedbacks are critical for determining the photosynthetic response to assumptions about stomatal function and some regions are particularly sensitive to choice of g 1M . Supplementary Material File (2025_james_liu_main.pdf) Download 4.73 MB File (2025_james_liu_supp.pdf) Download 7.23 MB Information & Authors Information Version history V1 Version 1 11 October 2024 V2 Version 2 13 January 2025 V3 Version 3 21 April 2025 Peer review timeline Published Journal of Advances in Modeling Earth Systems Version of Record 17 Nov 2025 Published Copyright This work is licensed under a Non Exclusive No Reuse License. Keywords climate modeling ecosystem-climate interactions photosynthesis stomatal conductance temperature sensitivity water use efficiency Authors Affiliations Amy X. Liu [email protected] University of Washington View all articles by this author Claire M. Zarakas 0000-0001-9992-3785 University of Washington View all articles by this author Benjamin G. Buchovecky 0009-0006-3022-4488 University of Washington View all articles by this author Linnia R. Hawkins Columbia University View all articles by this author Alana S. Cordak University of Georgia View all articles by this author Ashley E. Cornish University of Georgia View all articles by this author Marja Haagsma 0000-0002-1777-7284 Oregon State University View all articles by this author Gabriel J. Kooperman 0000-0002-3174-4913 University of Georgia View all articles by this author Christopher J. Still 0000-0002-8295-4494 Oregon State University View all articles by this author Charles D. Koven 0000-0002-3367-0065 Lawrence Berkeley National Laboratory (DOE) View all articles by this author Alexander J. Turner 0000-0003-1406-7372 University of Washington View all articles by this author David S. Battisti 0000-0003-4871-1293 University of Washington View all articles by this author James T. Randerson 0000-0001-6559-7387 University of California, Irvine View all articles by this author Forrest M. Hoffman 0000-0001-5802-4134 Oak Ridge National Laboratory (DOE) View all articles by this author Abigail L.S. Swann 0000-0001-8513-1074 University of Washington View all articles by this author Funding Information U.S. Department of Energy DE-AC02-05Cc11231 Charles D. Koven National Science Foundation DGE-2140004 Amy X. Liu U.S. Department of Energy DE-SC0020347 Claire M. Zarakas U.S. Department of Energy DE-SC0021209 Abigail L.S. Swann, Christopher J. Still, Gabriel J. Kooperman Metrics & Citations Metrics Article Usage 712 views 279 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Amy X. Liu, Claire M. Zarakas, Benjamin G. Buchovecky, et al. Atmospheric feedbacks reverse the sensitivity of modeled photosynthesis to stomatal function. Authorea . 21 April 2025. DOI: https://doi.org/10.22541/au.172867674.41108945/v3 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download. For more information or tips please see 'Downloading to a citation manager' in the Help menu . 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