DOI: 10.1002/2017JD027718
Scopus记录号: 2-s2.0-85040657341
论文题名: Ten Year Analysis of Tropopause-Overshooting Convection Using GridRad Data
作者: Cooney J.W. ; Bowman K.P. ; Homeyer C.R. ; Fenske T.M.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 1 起始页码: 329
结束页码: 343
语种: 英语
英文关键词: echo top
; GridRad
; overshooting convection
; radar reflectivity
; stratosphere-troposphere exchange
Scopus关键词: analytical method
; atmospheric convection
; instrumentation
; NEXRAD
; observational method
; reflectivity
; stratosphere-troposphere interaction
; trace gas
; tropopause
; United States
英文摘要: Convection that penetrates the tropopause (overshooting convection) rapidly transports air from the lower troposphere to the lower stratosphere, potentially mixing air between the two layers. This exchange of air can have a substantial impact on the composition, radiation, and chemistry of the upper troposphere and lower stratosphere (UTLS). In order to improve our understanding of the role convection plays in the transport of trace gases across the tropopause, this study presents a 10 year analysis of overshooting convection for the eastern two thirds of the contiguous United States for March through August of 2004 to 2013 based on radar observations. Echo top altitudes are estimated at hourly intervals using high-resolution, three-dimensional, gridded, radar reflectivity fields created by merging observations from available radars in the National Oceanic and Atmospheric Administration Next Generation Weather Radar (NEXRAD) network. Overshooting convection is identified by comparing echo top altitudes with tropopause altitudes derived from the ERA-Interim reanalysis. It is found that overshooting convection is most common in the central United States, with a weak secondary maximum along the southeast coast. The maximum number of overshooting events occur consistently between 2200 and 0200 UTC. Most overshooting events occur in May, June, and July when convection is deepest and the tropopause altitude is relatively low. Approximately 45% of the analyzed overshooting events (those with echo tops at least 1 km above the tropopause) have echo tops extending above the 380 K level into the stratospheric overworld. ©2018. 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/114699
Appears in Collections: 气候减缓与适应
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作者单位: Department of Atmospheric Sciences, Texas A&M University, College Station, TX, United States; School of Meteorology, University of Oklahoma, Norman, OK, United States
Recommended Citation:
Cooney J.W.,Bowman K.P.,Homeyer C.R.,et al. Ten Year Analysis of Tropopause-Overshooting Convection Using GridRad Data[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(1)