DOI: 10.1002/2017JD027080
Scopus记录号: 2-s2.0-85040640638
论文题名: Convectively Driven Tropopause-Level Cooling and Its Influences on Stratospheric Moisture
作者: Kim J. ; Randel W.J. ; Birner T.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 1 起始页码: 590
结束页码: 606
语种: 英语
英文关键词: deep convection
; GPS RO
; stratospheric moisture
; tropical tropopause layer
; tropopause cooling
Scopus关键词: atmospheric circulation
; atmospheric convection
; atmospheric moisture
; CloudSat
; cooling
; COSMIC
; GPS
; Madden-Julian oscillation
; mesoscale meteorology
; microwave limb sounder
; radar
; stratosphere
; temperature anomaly
; temperature profile
; tropopause
; warming
; water vapor
; Pacific Ocean
; Pacific Ocean (West)
英文摘要: Characteristics of the tropopause-level cooling associated with tropical deep convection are examined using CloudSat radar and Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC) GPS radio occultation measurements. Extreme deep convection is sampled based on the cloud top height (>17 km) from CloudSat, and colocated temperature profiles from COSMIC are composited around the deep convection. Response of moisture to the tropopause-level cooling is also examined in the upper troposphere and lower stratosphere using microwave limb sounder measurements. The composite temperature shows an anomalous warming in the troposphere and a significant cooling near the tropopause (at 16–19 km) when deep convection occurs over the western Pacific, particularly during periods with active Madden-Julian Oscillation (MJO). The composite of the tropopause cooling has a large horizontal scale (~6,000 km in longitude) with minimum temperature anomaly of ~ −2 K, and it lasts more than 2 weeks with support of mesoscale convective clusters embedded within the envelope of the MJO. The water vapor anomalies show strong correlation with the temperature anomalies (i.e., dry anomaly in the cold anomaly), showing that the convectively driven tropopause cooling actively dehydrate the lower stratosphere in the western Pacific region. The moisture is also affected by anomalous Matsuno-Gill-type circulation associated with the cold anomaly, in which dry air spreads over a wide range in the tropical tropopause layer (TTL). These results suggest that convectively driven tropopause cooling and associated transient circulation play an important role in the large-scale dehydration process in the TTL. ©2017. 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/114698
Appears in Collections: 气候减缓与适应
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作者单位: National Center for Atmospheric Research, Boulder, CO, United States; Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States; Now at Department of Atmospheric Science, Kongju National University, Gongju, South Korea
Recommended Citation:
Kim J.,Randel W.J.,Birner T.. Convectively Driven Tropopause-Level Cooling and Its Influences on Stratospheric Moisture[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(1)