气候变化领域集成服务门户(CCPortal): Disentangling the Regional Climate Impacts of Competing Vegetation Responses to Elevated Atmospheric CO2

CCPortal

DOI	10.1029/2020JD034108
	Disentangling the Regional Climate Impacts of Competing Vegetation Responses to Elevated Atmospheric CO2
	McDermid S.S.; Cook B.I.; De Kauwe M.G.; Mankin J.; Smerdon J.E.; Williams A.P.; Seager R.; Puma M.J.; Aleinov I.; Kelley M.; Nazarenko L.
发表日期	2021
ISSN	2169897X
卷号	126 期号:5
英文摘要	Biophysical vegetation responses to elevated atmospheric carbon dioxide (CO2) affect regional hydroclimate through two competing mechanisms. Higher CO2 increases leaf area (LAI), thereby increasing transpiration and water losses. Simultaneously, elevated CO2 reduces stomatal conductance and transpiration, thereby increasing rootzone soil moisture. Which mechanism dominates in the future is highly uncertain, partly because these two processes are difficult to explicitly separate within dynamic vegetation models. We address this challenge by using the GISS ModelE global climate model to conduct a novel set of idealized 2×CO2 sensitivity experiments to: evaluate the total vegetation biophysical contribution to regional climate change under high CO2; and quantify the separate contributions of enhanced LAI and reduced stomatal conductance to regional hydroclimate responses. We find that increased LAI exacerbates soil moisture deficits across the sub-tropics and more water-limited regions, but also attenuates warming by ∼0.5–1°C in the US Southwest, Central Asia, Southeast Asia, and northern South America. Reduced stomatal conductance effects contribute ∼1°C of summertime warming. For some regions, enhanced LAI and reduced stomatal conductance produce nonlinear and either competing or mutually amplifying hydroclimate responses. In northeastern Australia, these effects combine to exacerbate radiation-forced warming and contribute to year-round water limitation. Conversely, at higher latitudes these combined effects result in less warming than would otherwise be predicted due to nonlinear responses. These results highlight substantial regional variation in CO2-driven vegetation responses and the importance of improving model representations of these processes to better quantify regional hydroclimate impacts. © 2021. The Authors.
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185427
作者单位	Department of Environmental Studies, New York University, New York, NY, United States; NASA Goddard Institute for Space Studies, New York, NY, United States; Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States; ARC Centre of Excellence for Climate Extremes, Sydney, NSW, Australia; Change Research Centre, University of New South Wales, Sydney, NSW, Australia; Evolution & Ecology Research Centre, University of New South Wales, Sydney, NSW, Australia; Department of Geography, Dartmouth College, Hanover, NH, United States; Center for Climate Systems Research, Columbia University, New York, NY, United States
推荐引用方式 GB/T 7714	McDermid S.S.,Cook B.I.,De Kauwe M.G.,et al. Disentangling the Regional Climate Impacts of Competing Vegetation Responses to Elevated Atmospheric CO2[J],2021,126(5).
APA	McDermid S.S..,Cook B.I..,De Kauwe M.G..,Mankin J..,Smerdon J.E..,...&Nazarenko L..(2021).Disentangling the Regional Climate Impacts of Competing Vegetation Responses to Elevated Atmospheric CO2.Journal of Geophysical Research: Atmospheres,126(5).
MLA	McDermid S.S.,et al."Disentangling the Regional Climate Impacts of Competing Vegetation Responses to Elevated Atmospheric CO2".Journal of Geophysical Research: Atmospheres 126.5(2021).