DOI: 10.1175/JCLI-D-13-00339.1
Scopus记录号: 2-s2.0-84897612867
论文题名: Objective identification of the intertropical convergence Zone: Climatology and trends from the ERA-Interim
作者: Berry G. ; Reeder M.J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 5 起始页码: 1894
结束页码: 1909
语种: 英语
Scopus关键词: Automatically generated
; Intertropical convergence zone
; Lower troposphere
; Maritime Continent
; Numerical weather prediction
; Objective identification
; Operational forecasts
; Tropical cyclogenesis
; Weather forecasting
; Wind effects
; Climatology
; atmospheric dynamics
; climate modeling
; climatology
; cyclogenesis
; El Nino-Southern Oscillation
; identification method
; intertropical convergence zone
; La Nina
; trend analysis
; tropical cyclone
; weather forecasting
; Pacific Ocean
; Pacific Ocean (East)
; Pacific Ocean (West)
英文摘要: An objective method for the identification of the intertropical convergence zone (ITCZ) in gridded numerical weather prediction datasets is presented. This technique uses layer- and time-averaged winds in the lower troposphere to automatically detect the location of the ITCZ and is designed for use with datasets including operational forecasts and climate model output. The method is used to create a climatology of ITCZ properties from the Interim ECMWF Re-Analysis (ERA-Interim) dataset for the period 1979-2009 to serve as an indicator of the technique's ability and a benchmark for future comparisons. The automatically generated objective climatology closely matches the results from subjective studies, showing a seasonal cycle in which the oceanic ITCZ migrates meridionally and the land-based ITCZ features are predominantly summertime phenomena. Composites based on the phase of the El Niño-Southern Oscillation index show a major shift in the mean position and changes in intensity of the ITCZ in all ocean basins as the index varies. Under La Niña conditions, the ITCZ intensifies over the Maritime Continent and eastern Pacific, where the ITCZ weakens over the central and equatorial eastern Pacific. An analysis of changes in the ITCZ and its divergence during the period 1979-2009 indicates that the mean position of the ITCZ shifts southward in the western Pacific and a broad global intensification of the convergence into ITCZ regions. The relationship between tropical cyclogenesis and the ITCZ is also examined, finding that more than 50% of all tropical cyclones form within 600km of the ITCZ. © 2014 American Meteorological Society. 资助项目: ARC, Australian Research Council
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50933
Appears in Collections: 气候变化事实与影响
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作者单位: Monash Weather and Climate, Monash University, Clayton, VIC, Australia; Monash Weather and Climate, Centre of Excellence for Climate System Science, School of Mathematical Sciences, Monash University, Clayton, VIC, Australia
Recommended Citation:
Berry G.,Reeder M.J.. Objective identification of the intertropical convergence Zone: Climatology and trends from the ERA-Interim[J]. Journal of Climate,2014-01-01,27(5)