DOI: 10.1002/jgrd.50838
论文题名: The South Pacific Convergence Zone in three decades of satellite images
作者: Haffke C. ; Magnusdottir G.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 19 起始页码: 10839
结束页码: 10849
语种: 英语
英文关键词: 30 years of satellite observations
; SPCZ variability
; tropical convection zones
Scopus关键词: Atmospheric pressure
; Climate change
; Geostationary satellites
; Salinity measurement
; Satellite imagery
; Interannual variability
; Intraseasonal time scale
; Intraseasonal variability
; Madden-Julian oscillation
; Satellite observations
; South pacific convergence zones
; SPCZ variability
; Tropical convection
; Tropics
; annual variation
; data set
; El Nino-Southern Oscillation
; geostationary satellite
; Madden-Julian oscillation
; marine atmosphere
; satellite imagery
; sea surface temperature
; seasonality
; Pacific Ocean
; Pacific Ocean (South)
英文摘要: Interannual variability, seasonal evolution, and intraseasonal variability of the South Pacific Convergence Zone (SPCZ) are quantified using a new data set of 3-hourly SPCZ labels, available from 1980 to 2012 Nov-Apr. The SPCZ label is a binary field indicating presence (1) or absence (0) of the SPCZ at each grid point (1/2° longitude by 1/2° latitude) as a function of time and is the output of a Bayesian spatiotemporal statistical model that takes in instantaneous data from geostationary satellites. The statistical model is designed to emulate the way human observers identify the SPCZ. Results show two distinct parts to the SPCZ: the western tropical part and the eastern subtropical part. At times, the two parts do not connect. When they do connect, they are oriented quite differently, such that the subtropical part has a steeper meridional slope. The SPCZ is present 50-70% of the time in the tropics from Jan to Mar and is usually anchored to the warm sea surface temperature (SST) distribution of the equatorial west Pacific. The subtropical part does not have the same sensitivity to the underlying SST distribution and is present more often in Nov-Dec and Apr than in Jan-Mar when the SST is highest. Interannual variability in SPCZ location is strongly associated with El Niño-Southern Oscillation (ENSO); however, no change in overall SPCZ area is detected in association with ENSO. On the intraseasonal time scale, composite analysis shows the distinct spatial patterns in SPCZ presence associated with each phase of the Madden Julian Oscillation. Key Points Developed a 30 year, 3-hourly data set of SPCZ location and extent Presents interannual and intraseasonal variability of SPCZ location Presents seasonal evolution of SPCZ location and extent ©2013. American Geophysical Union. All Rights Reserved. 资助项目: AGS-1206120
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63288
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: Department of Earth System Science, University of California, Irvine, CA 92697-3100, United States
Recommended Citation:
Haffke C.,Magnusdottir G.. The South Pacific Convergence Zone in three decades of satellite images[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(19)