DOI: 10.1029/2012JD018124
论文题名: Characteristics of stratosphere-troposphere exchange during the Meiyu season
作者: Luo J. ; Tian W. ; Pu Z. ; Zhang P. ; Shang L. ; Zhang M. ; Hu J.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 4 起始页码: 2058
结束页码: 2072
语种: 英语
英文关键词: lower stratosphere
; Meiyu
; stratosphere-troposphere exchange
; tropopause
; upper troposphere
Scopus关键词: Climate models
; Clouds
; Weather forecasting
; Lower stratosphere
; Meiyu
; Stratosphere-troposphere exchange
; tropopause
; Upper troposphere
; Troposphere
; atmospheric modeling
; data set
; general circulation model
; meridional circulation
; numerical model
; stratosphere
; tropopause
; troposphere
; vorticity
; weather forecasting
; China
; Huai River
; Yangtze Valley
英文摘要: Characteristics of stratosphere-troposphere exchange (STE) during the Meiyu season in the Yangtze-Huaihe valley, China, is investigated using the European Centre for Medium-Range Weather Forecasts interim reanalysis data, National Centers for Environmental Prediction/National Center for Atmospheric Research reanalysis data, Meiyu records from the National Climate Center of China, the data from a trajectory model, and a general circulation model (GCM). Results show increases in potential vorticity and decreases in specific humidity in the upper troposphere and lower stratosphere (UTLS) before Meiyu onset, suggesting a strong downward transport of air masses around the tropopause that can be attributed to frequent tropopause folds over the Meiyu area. The minimum tropopause height occurs 3 days before Meiyu onset and then rises until about 6 days afterward. The downward cross-tropopause mass transport (CTMF) is evidenced before Meiyu onset, which is mainly caused by the sharp meridional gradients in the tropopause pressure over the Meiyu area. After Meiyu onset, the upward cross-tropopause transport intensifies due to enhanced convections. The analysis also suggests the strongest upward transport in the UTLS occurs northeast of the Meiyu region, within the core of the upper tropospheric westerly jet. Results from a trajectory model indicate that the lower stratospheric air intrudes into the troposphere before Meiyu onset. The significant upward movements of the middle tropospheric air are notable after Meiyu onset. As convections are weak and the upper level westerly jet is located far to the Meiyu area in poor Meiyu years, the upward CTMF over the Meiyu region is weaker during the Meiyu season compared with that in rich Meiyu years. Key PointsThe net transport is from the stratosphere to the troposphere before Meiyu onsetSTE caused by the sharp meridional gradients in the tropopause pressureThe air intrudes into the troposphere from levels above 18 km © 2012. 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/63905
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: Key Laboratory of Semi-Arid Climate Change, College of Atmospheric Sciences, Lanzhou University, Lanzhou, China; Department of Atmospheric Sciences, University of Utah, Salt Lake City, UT, United States; National Climate Center, Beijing, China; Inner Mongolia Autonomous Region Meteorological Observatory, Hohhot, China; State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Beijing, China
Recommended Citation:
Luo J.,Tian W.,Pu Z.,et al. Characteristics of stratosphere-troposphere exchange during the Meiyu season[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(4)