DOI: 10.1002/2015GL065830
论文题名: Covariation of finite-amplitude wave activity and the zonal mean flow in the midlatitude troposphere: 1. Theory and application to the Southern Hemisphere summer
作者: Wang L. ; Nakamura N.
刊名: Geophysical Research Letters
ISSN: 0094-8544
EISSN: 1944-8275
出版年: 2015
卷: 42, 期: 19 起始页码: 8192
结束页码: 8200
语种: 英语
英文关键词: baroclinic annular mode
; eddy-mean flow interaction
; finite-amplitude wave activity
Scopus关键词: Budget control
; Damping
; Flow interactions
; Mechanical waves
; Momentum
; Surface waves
; Troposphere
; Baroclinic
; Eddy momentum flux
; Eddy-mean flow interaction
; Finite amplitude waves
; Higher frequencies
; Midlatitude troposphere
; Southern Hemisphere
; Wave-mean-flow interaction
; Heat flux
; amplitude
; barotropic motion
; covariance analysis
; damping
; eddy covariance
; heat flux
; midlatitude environment
; periodicity
; Southern Hemisphere
; summer
; troposphere
; wave action
; zonal flow
英文摘要: Tropospheric eddy-mean flow interaction is formulated in terms of the vertically integrated budget of finite-amplitude wave activity (FAWA). At each latitude the dynamics is governed by three coupled equations for the interior and surface FAWA and barotropic zonal mean zonal flow. In midlatitude austral summer, the budget reveals a largely adiabatic, antiphase covariation of FAWA and the mean flow. A marked periodicity is found for FAWA around 20-30 days, but not the mean flow, consistent with the recently discovered baroclinic annular mode. The difference in the spectra of FAWA and the mean flow arises from (i) distinct spectra of low-level meridional eddy heat flux and the barotropic eddy momentum flux convergence and (ii) a strong thermal damping of surface wave activity: the latter makes the FAWA respond largely to the low-level meridional eddy heat flux at low frequencies, whereas the zonal mean flow responds to the momentum flux convergence whose spectrum is broader and occupies higher frequencies. Key Points Barotropic wave-mean flow interaction is formulated through finite-amplitude wave activity budget In Southern Hemisphere summer, FAWA anomaly exhibits a marked periodicity around 20-30 days A strong thermal damping of surface FAWA allows interior FAWA to be controlled by low-level meridional eddy heat flux © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84946925849&doi=10.1002%2f2015GL065830&partnerID=40&md5=390f2c8f1d5a5b104275ec1700487650
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8160
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of the Geophysical Sciences, University of Chicago, Chicago, IL, United States
Recommended Citation:
Wang L.,Nakamura N.. Covariation of finite-amplitude wave activity and the zonal mean flow in the midlatitude troposphere: 1. Theory and application to the Southern Hemisphere summer[J]. Geophysical Research Letters,2015-01-01,42(19).