气候变化领域集成服务门户(CCPortal): Seasonal tropospheric cooling in Northeast China associated with cropland expansion

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DOI	10.1088/1748-9326/ab6616
	Seasonal tropospheric cooling in Northeast China associated with cropland expansion
	He Y.; Lee E.; Mankin J.S.
发表日期	2020
ISSN	17489318
卷号	15 期号:3
英文摘要	Large-scale agricultural expansion can influence near-surface climate by altering surface energy fluxes, water, and albedo. It is less clear whether such effects extend through the full troposphere and how such effects vary in time. Here we use a novel dataset documenting the massive land use and land cover change due to agricultural expansion in Northeast China from 1982 to 2010 to assess how such expansion has influenced climate over the full troposphere. Confronting our land classification and climate data with a number of statistical approaches (linear regression, correlation analysis, Granger-causality), we find that cropland significantly increased by ∼28% over the near 30 year period in Northeast China-an average rate of nearly a percentage per year. This massive 30 year agricultural expansion is tightly associated with near-surface cooling identified in station data during the late growing season (August to September). Assuming no cropland expansion over the 30 year period, surface temperature would have increased by 0.93 °C 0.4 °C. Furthermore, the fingerprint of cropland-associated cooling extends upward into the atmospheric column, influencing the vertical structure of the regional troposphere and potentially its circulation. For every 10 percentage points increase in cropland fraction over Northeast China, regional full-troposphere temperature and geopotential height significantly decrease by 0.2 °C-0.6 °C and 20 m-80 m, respectively. These observed relationships are remarkably coherent across datasets, methodological choices, atmospheric levels, and theory, suggesting that the observational effects we identify are robust and imply the possibility of detectable land use change effects on regional circulation, with potential consequences for the East Asian monsoon. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	china; cropland; geopotential height; land use and land cover change; temperature
语种	英语
scopus关键词	Agricultural robots; Agriculture; Atmospheric structure; Climate change; Land use; Temperature; Agricultural expansion; china; cropland; Geo-potential heights; Land use and land cover change; Regional circulation; Statistical approach; Surface energy fluxes; Troposphere; agrometeorology; cooling; data set; energy flux; geopotential; growing season; land classification; land cover; land use change; seasonal variation; surface energy; surface temperature; troposphere; China
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/154175
作者单位	Department of Geography, Dartmouth College, Hanover, NH, United States; Department of Geology and Geography, West Virginia UniversityWV, United States; Department of Geography, Kyung Hee University, Seoul, South Korea; Department of Earth Sciences, Dartmouth College, Hanover, NH, United States; Lamont-Doherty Earth Observatory of Columbia University, New York, NY, United States
推荐引用方式 GB/T 7714	He Y.,Lee E.,Mankin J.S.. Seasonal tropospheric cooling in Northeast China associated with cropland expansion[J],2020,15(3).
APA	He Y.,Lee E.,&Mankin J.S..(2020).Seasonal tropospheric cooling in Northeast China associated with cropland expansion.Environmental Research Letters,15(3).
MLA	He Y.,et al."Seasonal tropospheric cooling in Northeast China associated with cropland expansion".Environmental Research Letters 15.3(2020).