DOI: 10.1175/JCLI-D-14-00210.1
Scopus记录号: 2-s2.0-84921636401
论文题名: The relevance of the location of blocking highs for stratospheric variability in a changing climate
作者: Ayarzagüena B. ; Orsolini Y.J. ; Langematz U. ; Abalichin J. ; Kubin A.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 2 起始页码: 531
结束页码: 549
语种: 英语
Scopus关键词: Fluxes
; Vortex flow
; Atlantic Ocean
; Changing climate
; Planetary Waves
; Stratospheric variability
; Stratospheric warmings
; Transient simulation
; Wave activity
; Wave-activity flux
; Atmospheric chemistry
; atmospheric wave
; climate change
; climate variation
; jet flow
; planetary wave
; polar vortex
; stratosphere
; Atlantic Ocean
; Pacific Ocean
; Pacific Ocean (Northwest)
英文摘要: Previous research shows that blocking highs (BHs) influence wintertime polar stratospheric variability through the modulation of the climatological planetary waves (PWs) depending on theBHlocation. BHs over the Euro-Atlantic sector tend to enhance the upward PW propagation, and those over the northwestern Pacific Ocean tend to reduce it. Future changes are examined in the response of the wave activity flux to the BH location and their relationship with wintertime stratospheric variability in transient simulations of ECHAM/Modular Earth Submodel System (MESSy) Atmospheric Chemistry (EMAC). After it is verified thatEMACcan reproduce qualitatively well the geographical dependence of theBHinfluence onPWactivity injection, it is shown that this dependence does not change in the future. However, an eastward shift of the pattern of the BH influence on PW propagation over the Pacific, a farther eastward extension of the pattern over the Atlantic Ocean, and an intensification of the wavenumber-1 component of the interaction between climatological and anomalous waves are detected. Changes in the upper-tropospheric jet and an intensification of the wavenumber-1 climatological wave due to a strengthening of the Aleutian low agree with these variations. The spatial distribution of future BHs preceding extreme polar vortex events is also affected by the slight modifications in the wave activity pattern. Hence, future BHs preceding strong vortex events tend to be more concentrated over the Pacific than in the past, where BHs interfere negatively with wavenumber-1 climatological waves. Future BHs prior to major stratospheric warmings are located in a broader area than in the past, predominantly over an extended Euro-Atlantic sector. © 2015 American Meteorological Society. 资助项目: DFG, Deutsche Forschungsgemeinschaft
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50858
Appears in Collections: 气候变化事实与影响
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作者单位: Institut für Meteorologie, Freie Universität Berlin, Berlin, Germany; Norwegian Institute for Air Research, Kjeller, Norway
Recommended Citation:
Ayarzagüena B.,Orsolini Y.J.,Langematz U.,et al. The relevance of the location of blocking highs for stratospheric variability in a changing climate[J]. Journal of Climate,2015-01-01,28(2)