DOI: 10.1002/2015GL066027
论文题名: Response of the intertropical convergence zone to zonally asymmetric subtropical surface forcings
作者: Shaw T.A. ; Voigt A. ; Kang S.M. ; Seo J.
刊名: Geophysical Research Letters
ISSN: 0094-8410
EISSN: 1944-8141
出版年: 2015
卷: 42, 期: 22 起始页码: 9961
结束页码: 9969
语种: 英语
英文关键词: Climate Dynamics
; Intertropical Convergence Zone
; Stationary waves
Scopus关键词: Budget control
; Mechanical waves
; Aquaplanet model
; Climate dynamics
; Cloud radiative effects
; Intertropical convergence zone
; Momentum budget
; Northern Hemispheres
; Stationary waves
; Surface heat fluxes
; Heat flux
; asymmetry
; climate cycle
; cloud radiative forcing
; cooling
; heat flux
; intertropical convergence zone
; momentum transfer
; Northern Hemisphere
; radiative transfer
; Rossby number
; slab
; standing wave
; subtropical region
; warming
; zonal flow
英文摘要: The energetic framework predicts no shift of the zonal mean Intertropical Convergence Zone (ITCZ) in response to zonally asymmetric forcings (zonal warming and cooling regions with zero zonal mean) assuming radiative feedbacks are linear. Here we show the ITCZ shifts southward in response to a zonally asymmetric forcing in the Northern Hemisphere subtropics in a slab ocean aquaplanet model. The southward shift is consistent with decreased zonal mean energy input to the atmosphere due to cloud radiative effect changes in the cooling region. When cloud-radiative feedbacks are disabled the ITCZ shifts northward consistent with changes in the warming region where increased energy input via surface heat fluxes and stationary Rossby-wave transport dominate. Competition between cooling and warming regions leads to changes in gross moist stability. Our results show rectification of zonally asymmetric forcings play an important role in zonal mean ITCZ dynamics and highlight the importance of assessing the momentum budget when interpreting ITCZ shifts. Key Points Energetic framework predicts no shift of ITCZ to zonally asymmetric forcing Opposite ITCZ shifts for radiative feedbacks and surface heat fluxes Momentum budget can be used to infer robustness of energetic framework. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84956938195&doi=10.1002%2f2015GL066027&partnerID=40&md5=7f129123d459f3d3a50422ad1d71d20b
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8026
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:
Shaw T.A.,Voigt A.,Kang S.M.,et al. Response of the intertropical convergence zone to zonally asymmetric subtropical surface forcings[J]. Geophysical Research Letters,2015-01-01,42(22).