DOI: 10.1002/2013JD020908
论文题名: Dynamic variability of the Asian monsoon anticyclone observed in potential vorticity and correlations with tracer distributions
作者: Garny H. ; Randel W.J.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 24 起始页码: 13421
结束页码: 13433
语种: 英语
英文关键词: Asian monsoon anticyclone
; PV diagnostics
; tracer transport
Scopus关键词: Atmospheric thermodynamics
; Carbon monoxide
; Vorticity
; Asian monsoon
; Asian summer monsoons
; Carbon monoxide concentration
; Dynamic variability
; Microwave limb sounder
; Potential vorticity
; Temporal correlations
; Tracer transport
; Troposphere
; anticyclone
; atmospheric pollution
; atmospheric transport
; carbon monoxide
; correlation
; monsoon
; potential vorticity
; spatial distribution
; timescale
; troposphere
; upper atmosphere
; Asia
英文摘要: The Asian summer monsoon is associated with strong upward transport of tropospheric source gases and isolation of air within the upper tropospheric anticyclone, with a high degree of dynamical variability. Here we study the anticyclone in terms of potential vorticity (PV) as derived from reanalysis data. The strength of the anticyclone, as measured by low PV area, varies on subseasonal time scales (periods of 30-40 days), driven by variability in convection. The convective forcing of low PV areas is associated with heating in the middle troposphere and divergent motion in the upper troposphere, and we find that upper level divergence is a good predictor of the anticyclone strength. Low PV air is often observed to propagate from the forcing region to the west, and occasionally to the east. Carbon monoxide (CO) measured by the Aura Microwave Limb Sounder is used to study the covariability of chemical tracers with the anticyclone strength and location. Concentrations of CO maximize within the upper tropospheric anticyclone, and enhanced CO is well correlated with the spatial distribution of low PV. Time variations of CO concentrations in the upper troposphere (around 360 K) are not strongly correlated with anticyclone strength, probably because CO transport also involves coupling with surface CO sources (unlike PV). Temporal correlations with PV are stronger for CO at higher levels (380-400 K), suggesting that advective upward transport is important for tracer evolution at these levels. Key Points Variability of the Asian Monsoon Anticyclone is investigated with PV diagnostics Divergence is found to be a good predictor of anticyclone strength Carbon monoxide concentrations and the anticyclone are spatially well correlated ©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/63082
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: Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre, DE-82234 Oberpfaffenhofen, Germany; National Center for Atmospheric Research, Boulder CO, United States
Recommended Citation:
Garny H.,Randel W.J.. Dynamic variability of the Asian monsoon anticyclone observed in potential vorticity and correlations with tracer distributions[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(24)