DOI: 10.1002/2015MS000446
Scopus记录号: 2-s2.0-85027943426
论文题名: Convective response to changes in the thermodynamic environment in idealized weak temperature gradient simulations
作者: Sessions S ; L ; , Herman M ; J ; , Sentic S
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2015
卷: 7, 期: 2 起始页码: 712
结束页码: 738
语种: 英语
英文关键词: Advection
; Moisture
; Parameterization
; Temperature
; Thermal gradients
; Thermodynamics
; Tropical engineering
; Atmospheric stability
; Deep tropical convection
; Environmental conditions
; Large-scale circulation
; Moisture advection
; Multiple equilibrium
; Tropical convection
; Weak temperature gradient approximations
; Atmospheric temperature
; advection
; atmospheric circulation
; convection
; entrainment
; environmental conditions
; equilibrium
; moisture content
; parameterization
; perturbation
; precipitation intensity
; temperature gradient
; temperature profile
; thermodynamics
; tropical environment
; troposphere
英文摘要: We investigate the response of convection to idealized perturbations in the thermodynamic environment in simulations which parameterize the large-scale circulations using the weak temperature gradient (WTG) approximation. The perturbations include a combination of modifying the environmental moisture and atmospheric stability via imposing anomalies in reference moisture and temperature profiles. We find that changes in atmospheric stability strongly influence the character of convection by drastically modifying the vertical motion profile, whereas changes to atmospheric moisture modulate the intensity of precipitation produced by the convection, but do not qualitatively change the shape of the vertical motion profile. An important question is how does horizontal moisture advection into the domain affect convection? We test several different parameterizations of this process; these include lateral entrainment by circulations induced by enforcing WTG, a moisture relaxation which parameterizes the advection of moisture by large-scale nondivergent circulations, and control simulations in which both of these mechanisms are turned off so horizontal advection is assumed negligible compared to vertical advection. Interestingly, the most significant differences resulting from the choice of horizontal moisture advection scheme appear in environmental conditions which suppress-rather than support-the development of deep tropical convection. In this case, lateral entrainment related to WTG circulations is the only parameterization which results in extreme drying of the troposphere in environments which suppress convection. Consequently, this is the only parameterization which permits multiple equilibria - dry or precipitating steady states - in convection. © 2015. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/76048
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 Physics and Geophysical Research Center, New Mexico Tech, Socorro, New Mexico, United States
Recommended Citation:
Sessions S,L,, Herman M,et al. Convective response to changes in the thermodynamic environment in idealized weak temperature gradient simulations[J]. Journal of Advances in Modeling Earth Systems,2015-01-01,7(2)