DOI: 10.1175/2011JCLI3984.1
Scopus记录号: 2-s2.0-84856955909
论文题名: Convective activity over Africa and the tropical Atlantic inferred from 20 Years of geostationary Meteosat infrared observations
作者: Bennartz R. ; Schroeder M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 1 起始页码: 156
结束页码: 169
语种: 英语
Scopus关键词: African easterly jet
; Convective activity
; Convective systems
; Data sets
; Deep convection
; Global precipitation
; Infrared channel
; Infrared imagers
; Infrared observations
; Interannual variability
; Meteosat
; Ocean surfaces
; Rainfall estimates
; Satellite platforms
; Summer months
; Time-periods
; Tracking analysis
; Tropical atlantic
; Climate change
; Geostationary satellites
; Natural convection
; Time series
; Tropics
; Rain
; annual variation
; atmospheric convection
; comparative study
; convective system
; data set
; easterly wave
; jet flow
; Meteosat
; numerical model
; precipitation assessment
; precipitation intensity
; radiative transfer
; rainfall
; satellite data
; time series analysis
; Atlantic Ocean
; Atlantic Ocean (Tropical)
; Sahel [Sub-Saharan Africa]
英文摘要: A 20-yr (1986-2005) time series of Meteosat Visible and Infrared Imager (MVIRI) geostationary infrared observations was used to study deep convection over Africa and the tropical Atlantic. The 20-yr time period is covered by six consecutive satellites (Meteosat-2-7). To correct for possible systematic differences between instruments on the different satellite platforms, a time series of Meteosat infrared observations over cloud-free ocean surfaces was compared to reanalysis-based radiative transfer results. Based on the comparison of simulations with observations, a homogenization was performed for the MVIRI infrared channel. The homogenized 20-yr dataset was then subjected to a tracking analysis for deep convection over Africa and the tropical Atlantic for the boreal summer months of July-September. The mean state of convection as well as anomalies for high- and low-Sahel rainfall years were studied. Comparisons with the Global Precipitation Climatology Center's (GPCC) rainfall estimates were performed for the Sahel region and interannual variability was evaluated comparing convection for the five driest and five wettest Sahel years. Results support earlier findings that precipitation in the Sahel region is strongly linked to the latitudinal position of the African Easterly Jet with deep convection being triggered more strongly if the jet is displaced northward. A relationship between the jet position and long-lived convective systems over the tropical Atlantic was found as well. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52581
Appears in Collections: 气候变化事实与影响
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作者单位: Atmospheric and Oceanic Sciences, University of Wisconsin-Madison, Madison, WI, United States; Satellite Application Facility on Climate Monitoring, Deutscher Wetterdienst, Offenbach, Germany
Recommended Citation:
Bennartz R.,Schroeder M.. Convective activity over Africa and the tropical Atlantic inferred from 20 Years of geostationary Meteosat infrared observations[J]. Journal of Climate,2012-01-01,25(1)