气候变化领域集成服务门户(CCPortal): Modulation of Compound Extremes of Low Soil Moisture and High Vapor Pressure Deficit by Irrigation in India

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DOI	10.1029/2021JD034529
	Modulation of Compound Extremes of Low Soil Moisture and High Vapor Pressure Deficit by Irrigation in India
	Ambika A.K.; Mishra V.
发表日期	2021
ISSN	2169897X
卷号	126 期号:7
英文摘要	Compound extremes of low soil moisture and high vapor pressure deficit (VPD) have implications on terrestrial carbon sequestration, vegetation growth, and net primary productivity (NPP). Yet, the role of irrigation on the occurrence of compound extremes remains unexplored in India. Here, we use satellite observations, reanalysis data sets, and high-resolution simulations from the Weather Research and Forecasting (WRF) model to show that irrigation significantly reduces the frequency of compound extremes of low soil moisture and high VPD in India. The Indo-Gangetic plain witnessed a significant (p < 0.05) increase in mean annual soil moisture while a substantial reduction in VPD during 1979–2018. Moreover, irrigation caused considerable cooling over the Indo-Gangetic plain during 1982–2018. The increase in soil moisture and the decline in VPD partly contributed to a substantial rise in Normalized Difference Vegetation Index (NDVI) and NPP. We conducted high-resolution simulations using the WRF model to examine the role of irrigation in modulating the frequency of compound extremes during 1979–2018. The WRF simulations under the irrigation-on show a considerably reduced frequency of the compound extremes compared to the irrigation-off (control) simulations. Irrigation modulates compound extremes by changing the land surface energy budget and planetary boundary layer height. Therefore, there is a need to consider irrigation for reliable projections of compound extremes under a warming climate in intensively irrigated regions. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Compound extremes; cooling; irrigation; NDVI; soil moisture; VPD
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/185365
作者单位	Earth Sciences, Indian Institute of Technology (IIT), Gandhinagar, Gujarat, India; Civil Engineering, Indian Institute of Technology (IIT), Gandhinagar, Gujarat, India
推荐引用方式 GB/T 7714	Ambika A.K.,Mishra V.. Modulation of Compound Extremes of Low Soil Moisture and High Vapor Pressure Deficit by Irrigation in India[J],2021,126(7).
APA	Ambika A.K.,&Mishra V..(2021).Modulation of Compound Extremes of Low Soil Moisture and High Vapor Pressure Deficit by Irrigation in India.Journal of Geophysical Research: Atmospheres,126(7).
MLA	Ambika A.K.,et al."Modulation of Compound Extremes of Low Soil Moisture and High Vapor Pressure Deficit by Irrigation in India".Journal of Geophysical Research: Atmospheres 126.7(2021).