DOI: 10.1002/jgrd.50289
论文题名: A climatology of polar winter stratopause warmings and associated planetary wave breaking
作者: Greer K. ; Thayer J.P. ; Harvey V.L.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 10 起始页码: 4168
结束页码: 4180
语种: 英语
英文关键词: MetO
; Middle atmosphere dynamics
; polar winter aeronomy
; Sudden Stratospheric Warming
; UKMO
Scopus关键词: Oceanography
; Upper atmosphere
; MetO
; Middle atmosphere dynamics
; Polar winters
; Sudden stratospheric warming
; UKMO
; Climatology
; baroclinic instability
; climatology
; data assimilation
; global warming
; mesosphere
; Northern Hemisphere
; planetary wave
; polar meteorology
; potential vorticity
; Southern Hemisphere
; wave breaking
; winter
英文摘要: This work presents a climatology of synoptic-scale disturbances in the upper stratosphere lower mesosphere (USLM) based on 20.5 years of assimilated data analyses from the U. K. Meteorological Office (1991-2012). USLM disturbance criteria are established, based on stratopause warmings at the 2 hPa level, to create climatologies in both hemispheres that delineate their timing, frequency, and geographic location. USLM disturbances occur on average 2.3 times per winter in the Northern Hemisphere (NH) (November through March) and 1.6 times per winter in the Southern Hemisphere (SH) (May through September), persist on average for 8 days in the NH and only 4 days in the SH, occur most frequently in December (July) in the Northern (Southern) Hemisphere, and are predominantly located in the longitude sector between 0oE and 90oE in both hemispheres. This is the first work to show that all major Sudden Stratospheric Warmings (SSWs) over the 20.5 year data record are preceded by USLM disturbances. One third of USLM disturbances evolve into a major SSW; only 22% of minor SSWs evolve into a major SSW. USLM disturbances and minor SSWs illustrate, at times, similar occurrence statistics, but the minor warming criteria seem to include a more diverse range of dynamical conditions. USLM disturbances are more specific in their dynamical construct with strong baroclinicity being a necessary condition. Potential vorticity analysis indicates that all USLM events occur with planetary wave breaking and that subsequent baroclinic instability may lead to the development of USLM disturbances. Key Points 20.5 year MetO climatology of middle atmospheric disturbancesBaroclinic instability associated with PWB in the upper stratosphereRelationships between Stratopause warmings, PW activity, and SSWs ©2013. American Geophysical Union. All Rights Reserved. 资助项目: 1107498
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63745
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: University of Colorado, Aerospace Engineering Sciences Department, Boulder CO, United States; University of Colorado, Laboratory for Atmosphere and Space Physics, Boulder CO, United States
Recommended Citation:
Greer K.,Thayer J.P.,Harvey V.L.. A climatology of polar winter stratopause warmings and associated planetary wave breaking[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(10)