DOI: 10.1002/2016MS000837
Scopus记录号: 2-s2.0-85017383587
论文题名: Transient aspects of the Hadley circulation forced by an idealized off-equatorial ITCZ
作者: Gonzalez A ; O ; , Mora Rojas G ; , Schubert W ; H ; , Taft R ; K
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2017
卷: 9, 期: 1 起始页码: 668
结束页码: 690
语种: 英语
英文关键词: Differential equations
; Subsidence
; Turbulent flow
; Wave packets
; Equatorial waves
; Hadley circulation
; Inertia gravity waves
; Intertropical convergence zone
; ITCZ
; Meridional circulation
; Overturning circulation
; Spectral characteristics
; Gravity waves
; analytical method
; asymmetry
; diabatic process
; equatorial wave
; gravity wave
; Hadley cell
; heating
; intertropical convergence zone
; meridional circulation
; Northern Hemisphere
; overturn
; Southern Hemisphere
; troposphere
英文摘要: This paper presents analytical solutions of large-scale, zonally symmetric overturning circulations in the tropical free troposphere forced by transient diabatic heating in the off-equatorial intertropical convergence zone (ITCZ). The dynamics are discussed in the context of the time-dependent meridional circulation equation arising in an equatorial β-plane model. The solutions of these differential equations contain terms for the slow, quasi-balanced part of the response and terms for the transient, zonally symmetric, inertia-gravity wave part of the response. When the off-equatorial (north of the equator) ITCZ diabatic heating is switched on at various rates, both parts of the response reveal a basic asymmetry between the southern and northern hemispheres, with the southern hemisphere side containing most of the quasi-balanced compensating subsidence and transient inertia-gravity wave activity. The inertia-gravity waves travel in wave packets that bounce off a spectrum of turning latitudes and are analyzed in the context of an average conservation law approach. These traveling wave packets cause the mass flux in the southern and northern Hadley cells to pulsate on timescales of about 1, 2, and 3 days for diabatic heating of the external, first internal, and second internal vertical modes, respectively. The spectral characteristics of the vertical motion in the ITCZ and subsidence regions are slightly more complicated and depend on ITCZ location. © 2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75821
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; Now at Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, CA, United States; Department of Atmospheric Physics, Oceanography, and Planetary Science, University of Costa Rica, San Pedro Montes de Oca, Costa Rica
Recommended Citation:
Gonzalez A,O,, Mora Rojas G,et al. Transient aspects of the Hadley circulation forced by an idealized off-equatorial ITCZ[J]. Journal of Advances in Modeling Earth Systems,2017-01-01,9(1)