DOI: 10.1002/2016MS000873
Scopus记录号: 2-s2.0-85021742638
论文题名: Idealized modeling of convective organization with changing sea surface temperatures using multiple equilibria in weak temperature gradient simulations
作者: Sentić S ; , Sessions S ; L
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2017
卷: 9, 期: 2 起始页码: 1431
结束页码: 1449
语种: 英语
英文关键词: Atmospheric movements
; Atmospheric temperature
; Entropy
; Heat convection
; Moisture
; Moisture determination
; Surface properties
; Temperature
; Thermal gradients
; Wind
; Atmospheric stability
; Changing climate
; Initial Moisture Content
; Large-scale transport
; Multiple equilibrium
; Precipitation rates
; Sea surface temperature (SST)
; Weak temperature gradient approximations
; Oceanography
; boundary condition
; climate change
; convection
; multiple regression
; precipitation (climatology)
; sea surface temperature
; simulation
; temperature gradient
; wind velocity
英文摘要: The weak temperature gradient (WTG) approximation is a method of parameterizing the influences of the large scale on local convection in limited domain simulations. WTG simulations exhibit multiple equilibria in precipitation; depending on the initial moisture content, simulations can precipitate or remain dry for otherwise identical boundary conditions. We use a hypothesized analogy between multiple equilibria in precipitation in WTG simulations, and dry and moist regions of organized convection to study tropical convective organization. We find that the range of wind speeds that support multiple equilibria depends on sea surface temperature (SST). Compared to the present SST, low SSTs support a narrower range of multiple equilibria at higher wind speeds. In contrast, high SSTs exhibit a narrower range of multiple equilibria at low wind speeds. This suggests that at high SSTs, organized convection might occur with lower surface forcing. To characterize convection at different SSTs, we analyze the change in relationships between precipitation rate, atmospheric stability, moisture content, and the large-scale transport of moist entropy and moisture with increasing SSTs. We find an increase in large-scale export of moisture and moist entropy from dry simulations with increasing SST, which is consistent with a strengthening of the up-gradient transport of moisture from dry regions to moist regions in organized convection. Furthermore, the changes in diagnostic relationships with SST are consistent with more intense convection in precipitating regions of organized convection for higher SSTs. © 2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75801
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: Physics Department and Geophysical Research Center, New Mexico Institute of Mining and Technology, Socorro, NM, United States
Recommended Citation:
Sentić S,, Sessions S,L. Idealized modeling of convective organization with changing sea surface temperatures using multiple equilibria in weak temperature gradient simulations[J]. Journal of Advances in Modeling Earth Systems,2017-01-01,9(2)