DOI: 10.1002/2016MS000663
Scopus记录号: 2-s2.0-84978091982
论文题名: Forcings and feedbacks on convection in the 2010 Pakistan flood: Modeling extreme precipitation with interactive large-scale ascent
作者: Nie J ; , Shaevitz D ; A ; , Sobel A ; H
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2016
卷: 8, 期: 3 起始页码: 1055
结束页码: 1072
语种: 英语
英文关键词: Advection
; Astrophysics
; Feedback
; Floods
; Heat convection
; Moisture
; Extreme precipitation
; Moisture sensitivity
; Orographic lifting
; Quasi-geostrophic
; Static stability
; Precipitation (meteorology)
; advection
; climate modeling
; convection
; extreme event
; flood
; orography
; potential vorticity
; precipitation (climatology)
; precipitation intensity
; quasi-geostrophic flow
; sensitivity analysis
; Pakistan
英文摘要: Extratropical extreme precipitation events are usually associated with large-scale flow disturbances, strong ascent, and large latent heat release. The causal relationships between these factors are often not obvious, however, the roles of different physical processes in producing the extreme precipitation event can be difficult to disentangle. Here we examine the large-scale forcings and convective heating feedback in the precipitation events, which caused the 2010 Pakistan flood within the Column Quasi-Geostrophic framework. A cloud-revolving model (CRM) is forced with large-scale forcings (other than large-scale vertical motion) computed from the quasi-geostrophic omega equation using input data from a reanalysis data set, and the large-scale vertical motion is diagnosed interactively with the simulated convection. Numerical results show that the positive feedback of convective heating to large-scale dynamics is essential in amplifying the precipitation intensity to the observed values. Orographic lifting is the most important dynamic forcing in both events, while differential potential vorticity advection also contributes to the triggering of the first event. Horizontal moisture advection modulates the extreme events mainly by setting the environmental humidity, which modulates the amplitude of the convection's response to the dynamic forcings. When the CRM is replaced by either a single-column model (SCM) with parameterized convection or a dry model with a reduced effective static stability, the model results show substantial discrepancies compared with reanalysis data. The reasons for these discrepancies are examined, and the implications for global models and theoretical models are discussed. © 2016. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75880
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
There are no files associated with this item.
作者单位: Lamont-Doherty Earth Observatory, Columbia University, New York, NY, United States; Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY, United States
Recommended Citation:
Nie J,, Shaevitz D,A,et al. Forcings and feedbacks on convection in the 2010 Pakistan flood: Modeling extreme precipitation with interactive large-scale ascent[J]. Journal of Advances in Modeling Earth Systems,2016-01-01,8(3)