气候变化领域集成服务门户(CCPortal): Dry and moist dynamics shape regional patterns of extreme precipitation sensitivity

CCPortal

DOI	10.1073/pnas.1913584117
	Dry and moist dynamics shape regional patterns of extreme precipitation sensitivity
	Nie J.; Dai P.; Sobel A.H.
发表日期	2020
ISSN	0027-8424
起始页码	8757
结束页码	8763
卷号	117 期号:16
英文摘要	Responses of extreme precipitation to global warming are of great importance to society and ecosystems. Although observations and climate projections indicate a general intensification of extreme precipitation with warming on global scale, there are significant variations on the regional scale, mainly due to changes in the vertical motion associated with extreme precipitation. Here, we apply quasigeostrophic diagnostics on climate-model simulations to understand the changes in vertical motion, quantifying the roles of dry (large-scale adiabatic flow) and moist (small-scale convection) dynamics in shaping the regional patterns of extreme precipitation sensitivity (EPS). The dry component weakens in the subtropics but strengthens in the middle and high latitudes; the moist component accounts for the positive centers of EPS in the low latitudes and also contributes to the negative centers in the subtropics. A theoretical model depicts a nonlinear relationship between the diabatic heating feedback (α) and precipitable water, indicating high sensitivity of α (thus, EPS) over climatological moist regions. The model also captures the change of α due to competing effects of increases in precipitable water and dry static stability under global warming. Thus, the dry/moist decomposition provides a quantitive and intuitive explanation of the main regional features of EPS. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Climate change; Convection; Precipitation extreme
语种	英语
scopus关键词	Article; climate; decomposition; dry season; extreme environment; greenhouse effect; latitude; moisture; motion; nonlinear system; precipitation; priority journal; simulation; theoretical model; thermodynamics
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160300
作者单位	Nie, J., Department of Atmospheric and Oceanic Sciences, Peking University, Beijing, 100871, China; Dai, P., Department of Atmospheric and Oceanic Sciences, Peking University, Beijing, 100871, China; Sobel, A.H., Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY 10027, United States
推荐引用方式 GB/T 7714	Nie J.,Dai P.,Sobel A.H.. Dry and moist dynamics shape regional patterns of extreme precipitation sensitivity[J],2020,117(16).
APA	Nie J.,Dai P.,&Sobel A.H..(2020).Dry and moist dynamics shape regional patterns of extreme precipitation sensitivity.Proceedings of the National Academy of Sciences of the United States of America,117(16).
MLA	Nie J.,et al."Dry and moist dynamics shape regional patterns of extreme precipitation sensitivity".Proceedings of the National Academy of Sciences of the United States of America 117.16(2020).