DOI: 10.1007/s00382-013-2035-y
Scopus记录号: 2-s2.0-84905111322
论文题名: A new index for variations in the position of the South Pacific convergence zone 1910/11-2011/2012
作者: Salinger M.J. ; McGree S. ; Beucher F. ; Power S.B. ; Delage F.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 43, 期: 2017-03-04 起始页码: 881
结束页码: 892
语种: 英语
英文关键词: Climate variability
; El Niño
; Interdecadal Pacific oscillation
; La Niña
; New index
; South Pacific convergence zone
英文摘要: Quality controlled and recently homogenised mean sea level pressure records for the South Pacific are used to specify the location and variability of the South Pacific convergence zone (SPCZ) during the austral warm season (November-April). The SPCZ is the world's largest rainfall band during the austral summer, when it dominates the climate of the South Pacific. A new index called the South Pacific convergence zone index (SPCZI) is derived, and is shown to be coherent with changes in low level wind convergence associated with the SPCZ. This index replaces the earlier SPCZ position index because it uses higher quality mean sea level pressure data than the superseded index and extends the time series further forward in time. The SPCZI allows interannual to decadal variability in the climate of the South Pacific to be tracked for more than a century from 1910/1911 to 2011/2012. During El Niño episodes the SPCZ is displaced by about 1°-3° east, and La Niña events 1°-3° west of the mean position on average. The index indicates a striking movement eastward for the period 1977/78-1998/99, compared with 1944/45-1976/77 in association with the Interdecadal Pacific oscillation (IPO). The eastward movement of the SPCZ in the late twentieth century is related to significant precipitation trends in the South Pacific region. Since 1998/99 the SPCZ has regressed westward with the negative phase change of the IPO. The long-term trend in the SPCZI is very small relative to the interannual to decadal variability and is not statistically significant, suggesting that there has been little overall change in the mean position of the SPCZ over the past century. © 2014 Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54674
Appears in Collections: 过去全球变化的重建
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作者单位: University of Auckland, Auckland, New Zealand; Meteo-France, Toulouse, France; Pacific-Australia Climate Change Science and Adaptation Planning Program (PACCSAP), Melbourne, VIC, Australia; National Climate Centre, Melbourne, VIC, Australia; Centre for Atmospheric, Weather and Climate Research, Melbourne, VIC, Australia; Bureau of Meteorology, Docklands, Melbourne, VIC, Australia
Recommended Citation:
Salinger M.J.,McGree S.,Beucher F.,et al. A new index for variations in the position of the South Pacific convergence zone 1910/11-2011/2012[J]. Climate Dynamics,2014-01-01,43(2017-03-04)