DOI: 10.1002/jgrd.502912013
论文题名: Chemical discontinuity at the extratropical tropopause and isentropic stratosphere-troposphere exchange pathways diagnosed using Aura MLS data
作者: Jin J.J. ; Livesey N.J. ; Manney G.L. ; Jiang J.H. ; Schwartz M.J. ; Daffer W.H.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 9 起始页码: 3832
结束页码: 3847
语种: 英语
Scopus关键词: Carbon monoxide
; Oceanography
; Troposphere
; Data assimilation systems
; Extratropical tropopause
; Goddard earth observing systems
; Isentropic surfaces
; Meridional gradients
; Microwave limb sounder
; Relative coordinates
; Stratosphere-troposphere exchange
; Clouds
; carbon monoxide
; data assimilation
; data set
; ozone
; potential vorticity
; Rossby wave
; Southern Hemisphere
; stratosphere
; tropopause
; troposphere
; vorticity
; Asia
; Pacific Ocean
; Pacific Ocean (Southeast)
英文摘要: The chemical discontinuity at the extratropical tropopause (ExTP) and stratosphere-troposphere exchange (STE) pathways are investigated using the long-lived chemical species carbon monoxide (CO) and ozone (O3) measured by the Aura Microwave Limb Sounder (MLS). A relative coordinate, tropopause latitude (TpLat), is developed based on potential vorticity (PV) from the Goddard Earth Observing System version 5 (GEOS-5) data assimilation system. TpLat is defined as the shortest geographic distance along an isentropic surface from the extratropical tropopause (ExTP) to an observation location. Our results show that this coordinate highlights the sharp chemical discontinuities at the ExTP more clearly than the widely-used equivalent latitude coordinate. Geographical distributions of STE pathways and barriers are investigated based on meridional gradients in O3 abundances in the new TpLat coordinate in conjunction with analysis of Rossby wave breaking between 330 K and 360 K. In northern hemispheric (NH) winter (Dec-Jan-Feb), NH STE pathways are seen mainly above the northeast Pacific. In NH summer (Jun-Jul-Aug), the NH pathway covers all longitudes at 330 K. However, it is mainly located above Asia at 340 K and above the Atlantic and the North Pacific at 350 K and 360 K. In the southern hemisphere (SH), there is a weaker STE region above the Eastern Indian Ocean and the southwestern Pacific, at and above 350 K in SH winter, and a stronger STE region over the Southeastern Pacific at these levels during SH summer. In addition, this study shows NH PV gradients are slightly stronger near the ExTP in summer than in winter even though the subtropical jet is weaker and Rossby wave breaking is stronger in summer than in winter. © 2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63444
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: Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; New Mexico Institute of Mining and Technology, Socorro, NM, United States; GESTAR, Universities Space Research Association, Columbia, MD, United States
Recommended Citation:
Jin J.J.,Livesey N.J.,Manney G.L.,et al. Chemical discontinuity at the extratropical tropopause and isentropic stratosphere-troposphere exchange pathways diagnosed using Aura MLS data[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(9)