DOI: 10.1073/pnas.1913584117
论文题名: Dry and moist dynamics shape regional patterns of extreme precipitation sensitivity
作者: Nie J. ; Dai P. ; Sobel A.H.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期: 16 起始页码: 8757
结束页码: 8763
语种: 英语
英文关键词: Climate change
; Convection
; Precipitation extreme
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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164228
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Nie J.,Dai P.,Sobel A.H.. Dry and moist dynamics shape regional patterns of extreme precipitation sensitivity[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(16)