DOI: 10.1002/2015MS000511
Scopus记录号: 2-s2.0-84956867468
论文题名: The sensitivity of convective aggregation to diabatic processes in idealized radiative-convective equilibrium simulations
作者: Holloway C ; E ; , Woolnough S ; J
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2016
卷: 8, 期: 1 起始页码: 166
结束页码: 195
语种: 英语
英文关键词: Aggregates
; Atmospheric temperature
; Budget control
; Feedback
; Oceanography
; Radiation effects
; Surface measurement
; Surface waters
; Convection simulations
; Initial conditions
; Initial development
; Moist static energy
; Radiative-convective equilibrium
; Sea surface temperatures
; Self aggregation
; Sensitivity studies
; Agglomeration
; advection
; anomaly
; circulation
; cloud
; convection
; diabatic process
; equilibrium
; evaporation
; heating
; sea surface temperature
; sensitivity analysis
; simulation
; spatial variation
; surface flux
; variance analysis
; water vapor
英文摘要: Idealized explicit convection simulations of the Met Office Unified Model exhibit spontaneous self-aggregation in radiative-convective equilibrium, as seen in other models in previous studies. This self-aggregation is linked to feedbacks between radiation, surface fluxes, and convection, and the organization is intimately related to the evolution of the column water vapor field. Analysis of the budget of the spatial variance of column-integrated frozen moist static energy (MSE), following Wing and Emanuel (2014), reveals that the direct radiative feedback (including significant cloud longwave effects) is dominant in both the initial development of self-aggregation and the maintenance of an aggregated state. A low-level circulation at intermediate stages of aggregation does appear to transport MSE from drier to moister regions, but this circulation is mostly balanced by other advective effects of opposite sign and is forced by horizontal anomalies of convective heating (not radiation). Sensitivity studies with either fixed prescribed radiative cooling, fixed prescribed surface fluxes, or both do not show full self-aggregation from homogeneous initial conditions, though fixed surface fluxes do not disaggregate an initialized aggregated state. A sensitivity study in which rain evaporation is turned off shows more rapid self-aggregation, while a run with this change plus fixed radiative cooling still shows strong self-aggregation, supporting a "moisture-memory" effect found in Muller and Bony (2015). Interestingly, self-aggregation occurs even in simulations with sea surface temperatures (SSTs) of 295 and 290 K, with direct radiative feedbacks dominating the budget of MSE variance, in contrast to results in some previous studies. © 2016. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75931
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: Department of Meteorology, University of Reading, Reading, United Kingdom; NCAS-Climate, Department of Meteorology, University of Reading, Reading, United Kingdom
Recommended Citation:
Holloway C,E,, Woolnough S,et al. The sensitivity of convective aggregation to diabatic processes in idealized radiative-convective equilibrium simulations[J]. Journal of Advances in Modeling Earth Systems,2016-01-01,8(1)