DOI: 10.1175/JCLI-D-14-00285.1
Scopus记录号: 2-s2.0-84922770549
论文题名: Investigating the local atmospheric response to a realistic shift in the Oyashio sea surface temperature front
作者: Smirnov D. ; Newman M. ; Alexander M.A. ; Kwon Y.-O. ; Frankignoul C.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 3 起始页码: 1126
结束页码: 1147
语种: 英语
Scopus关键词: Advection
; Atmospheric temperature
; Budget control
; Moisture
; Surface waters
; Troposphere
; Anomalous heating
; Atmospheric response
; Differential thermals
; Lower troposphere
; Sea surface temperature fronts
; Vertical circulation
; Vertical pressure
; Western North Pacific
; Oceanography
; atmospheric circulation
; atmospheric modeling
; general circulation model
; sea surface temperature
; surface wind
; temperature anomaly
; troposphere
; vertical profile
; Oyashio Region
; Pacific Ocean
; Pacific Ocean (North)
英文摘要: The local atmospheric response to a realistic shift of the Oyashio Extension SST front in the western North Pacific is analyzed using a high-resolution (HR; 0.25°) version of the global Community Atmosphere Model, version 5 (CAM5). A northward shift in the SST front causes an atmospheric response consisting of a weak surface wind anomaly but a strong vertical circulation extending throughout the troposphere. In the lower troposphere, most of the SST anomaly-induced diabatic heating (Q˙) is balanced by poleward transient eddy heat and moisture fluxes. Collectively, this response differs from the circulation suggested by linear dynamics, where extratropical SST forcing produces shallow anomalous heating balanced by strong equatorward cold air advection driven by an anomalous, stationary surface low to the east. This latter response, however, is obtained by repeating the same experiment except using a relatively low-resolution (LR; 1°) version of CAM5. Comparison to observations suggests that the HR response is closer to nature than the LR response. Strikingly, HR and LR experiments have almost identical vertical profiles of Q˙. However, diagnosis of the diabatic quasigeostrophic vertical pressure velocity (ω) budget reveals that HR has a substantially stronger δ2Q˙ response, which together with upper-level mean differential thermal advection balances stronger vertical motion. The results herein suggest that changes in transient eddy heat and moisture fluxes are critical to the overall local atmospheric response to Oyashio Front anomalies, which may consequently yield a stronger downstream response. These changes may require the high resolution to be fully reproduced, warranting further experiments of this type with other high-resolution atmosphere-only and fully coupled GCMs. © 2015 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50638
Appears in Collections: 气候变化事实与影响
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作者单位: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, United States; NOAA/ESRL, Boulder, CO, United States; Woods Hole Oceanographic Institution, Woods Hole, MA, United States; LOCEAN/IPSL, Université Pierre et Marie Curie, Paris, France
Recommended Citation:
Smirnov D.,Newman M.,Alexander M.A.,et al. Investigating the local atmospheric response to a realistic shift in the Oyashio sea surface temperature front[J]. Journal of Climate,2015-01-01,28(3)