DOI: 10.1175/JCLI-D-13-00289.1
Scopus记录号: 2-s2.0-84896926945
论文题名: Initial transient response of the winter polar stratospheric vortex to idealized equatorial pacific sea surface temperature anomalies in thwe NCAR WACCM
作者: Hegyi B.M. ; Deng Y. ; Black R.X. ; Zhou R.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 7 起始页码: 2699
结束页码: 2713
语种: 英语
Scopus关键词: Climate change
; Coastal zones
; Oceanography
; Transient analysis
; Upper atmosphere
; High-latitude regions
; Initial atmospheric conditions
; Meridional circulation
; Polar stratospheric vortex
; Sea surface temperature anomalies
; Stratospheric polar vortex
; Whole atmosphere community climate models
; Zonal-mean zonal winds
; Vortex flow
; eddy
; Northern Hemisphere
; polar vortex
; sea surface temperature
; stratosphere
; temperature anomaly
; winter
; zonal wind
; Pacific Ocean
; Pacific Ocean (Central)
; Pacific Ocean (Equatorial)
英文摘要: Perpetual winter simulations using the NCAR Whole Atmosphere Community Climate Model (WACCM) are conducted to document the differences of the initial transient response of the boreal winter Northern Hemisphere stratospheric polar vortex to central (CPW) and eastern Pacific warming (EPW) events. Idealized patches of positive sea surface temperature (SST) anomalies are superimposed onto a climatological SST field to mimic canonical CPW and EPW forcings. A 20-member ensemble was created by varying initial atmospheric conditions for both CPW and EPW cases. In the ensemble average, the vortex weakens under bothCPWandEPWforcing, indicated by a negative zonal mean zonal wind tendency. This tendency is mainly tied to changes in the eddy-driven mean meridional circulation (MMC). A negative anomaly in the eddy momentum flux convergence also plays a secondary role in the weakening. The vortex response, however, differs dramatically among individual ensemble members. A few ensemble members exhibit initial vortex strengthening although weaker in magnitude and shorter in duration than the initial weakening in the ensemble average. The initial state and the subsequent internal variation of the extratropical atmosphere is at least as important as the type of SST forcing in determining the transient response of the stratospheric polar vortex. Interactions between the internal variability of the vortex and SST-driven wave anomalies ultimately determine the nature of the initial transient response of the vortex to EPW and CPW forcing. This sensitivity to the initial atmospheric state has implications for understanding medium-range forecasts of the extratropical atmospheric response to emerging tropical SST anomalies, particularly over high-latitude regions.© 2014 American Meteorological Society. 资助项目: NSF, National Science Foundation
; NASA, National Science Foundation
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51412
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, United States; CAS Key Laboratory of Geospace Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui, China
Recommended Citation:
Hegyi B.M.,Deng Y.,Black R.X.,et al. Initial transient response of the winter polar stratospheric vortex to idealized equatorial pacific sea surface temperature anomalies in thwe NCAR WACCM[J]. Journal of Climate,2014-01-01,27(7)