DOI: 10.1002/2013MS000278
Scopus记录号: 2-s2.0-84937198131
论文题名: Balanced dynamics of deep and shallow Hadley circulations in the tropics
作者: Gonzalez A ; O ; , Rojas G ; M
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2015
卷: 6, 期: 3 起始页码: 777
结束页码: 804
语种: 英语
英文关键词: Boundary layers
; Differential equations
; Heating
; Partial differential equations
; Ekman pumping
; Hadley circulation
; ITCZ
; Meridional circulation
; Overturning circulation
; Tropics
; deep sea
; diabatic process
; Ekman pumping
; Green function
; Hadley cell
; intertropical convergence zone
; meridional circulation
; overturn
; shallow water
; trophic environment
; troposphere
; Pacific Ocean
; Pacific Ocean (East)
英文摘要: This paper examines the dynamics of large-scale overturning circulations in the tropical atmosphere using an idealized zonally symmetric model on the equatorial β-plane. Under certain simplifications of its coefficients, the elliptic partial differential equation for the transverse circulation can be solved by first performing a vertical transform to obtain a horizontal structure equation, and then using Green's function to solve the horizontal structure equation. When deep diabatic heating is present in the Intertropical Convergence Zone (ITCZ), the deep Hadley circulation is of first-order importance. In the absence of deep diabatic heating, the interior circulation associated with Ekman pumping cannot penetrate deep into the troposphere because the resistance of fluid parcels to horizontal motion (i.e., inertial stability) is significantly smaller than their resistance to vertical motion (i.e., static stability). In this scenario, only a shallow Hadley circulation exists. The shallow overturning circulation is characterized by meridional velocities as large as 7 m s-1 at the top of the boundary layer, in qualitative agreement with observations in the tropical eastern Pacific. The meridional asymmetry between the winter and summer deep and shallow Hadley cells is attributed to the anisotropy of the inertial stability parameter, and as the ITCZ widens meridionally or as the forcing involves higher vertical wave numbers, the asymmetry between the winter and summer cells increases. Key Points ITCZ diabatic heating and Ekman pumping are studied using an analytical model Deep diabatic heating in the inviscid interior forces a deep Hadley circulation Ekman boundary layer pumping forces a shallow Hadley circulation © 2014. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/76021
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 Atmospheric Science, Colorado State University, Fort Collins, CO, United States
Recommended Citation:
Gonzalez A,O,, Rojas G,et al. Balanced dynamics of deep and shallow Hadley circulations in the tropics[J]. Journal of Advances in Modeling Earth Systems,2015-01-01,6(3)