DOI: 10.1002/2013MS000269
Scopus记录号: 2-s2.0-84899059181
论文题名: Physical mechanisms controlling self-aggregation of convection in idealized numerical modeling simulations
作者: Wing A ; A ; , Emanuel K ; A
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2014
卷: 6, 期: 1 起始页码: 59
结束页码: 74
语种: 英语
英文关键词: Aggregates
; Heat convection
; Oceanography
; Surface measurement
; Atmospheric water vapor
; Cloud resolving model
; Diagnostic techniques
; Numerical model simulations
; Radiative-convective equilibrium
; Sea surface temperature (SST)
; Self aggregation
; Short-wave radiation
; Feedback
; aggregation
; atmospheric convection
; atmospheric modeling
; cloud microphysics
; feedback mechanism
; longwave radiation
; numerical model
; shortwave radiation
; water vapor
; wind velocity
英文摘要: We elucidate the physics of self-aggregation by applying a new diagnostic technique to the output of a cloud resolving model. Specifically, the System for Atmospheric Modeling is used to perform 3- D cloud system resolving simulations of radiative-convective equilibrium in a nonrotating framework, with interactive radiation and surface fluxes and fixed sea surface temperature (SST). We note that self-aggregation begins as a dry patch that expands, eventually forcing all the convection into a single clump. Thus, when examining the initiation of self-aggregation, we focus on processes that can amplify this initial dry patch. We introduce a novel method to quantify the magnitudes of the various feedbacks that control self-aggregation within the framework of the budget for the spatial variance of column-integrated frozen moist static energy. The absorption of shortwave radiation by atmospheric water vapor is found to be a key positive feedback in the evolution of aggregation. In addition, we find a positive wind speed-surface flux feedback whose role is to counteract a negative feedback due to the effect of air-sea enthalpy disequilibrium on surface fluxes. The longwave radiation feedback can be either positive or negative in the early and intermediate stages of aggregation; however, it is the dominant positive feedback that maintains the aggregated state once it develops. Importantly, the mechanisms that maintain the aggregate state are distinct from those that instigate the evolution of self-aggregation. Key Points A new analysis method is used to quantify feedbacks governing self-aggregation Feedbacks that establish the cluster are different than those that maintain it Positive WISHE feedback opposes a negative surface flux disequilibrium feedback ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/76091
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Program in Atmospheres, Oceans, and Climate, Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge MA, United States
Recommended Citation:
Wing A,A,, Emanuel K,et al. Physical mechanisms controlling self-aggregation of convection in idealized numerical modeling simulations[J]. Journal of Advances in Modeling Earth Systems,2014-01-01,6(1)