DOI: 10.1175/JCLI-D-14-00610.1
Scopus记录号: 2-s2.0-84949921753
论文题名: Modelled rainfall response to strong El Niño sea surface temperature anomalies in the tropical pacific
作者: Chung C.T.Y. ; Power S.B.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 8 起始页码: 3133
结束页码: 3151
语种: 英语
Scopus关键词: Atmospheric pressure
; Atmospheric temperature
; Global warming
; Nickel
; Rain
; Submarine geophysics
; Surface properties
; Surface waters
; Atmospheric circulation
; Interannual variability
; Intertropical convergence zone
; Position and orientations
; Precipitation patterns
; Sea surface temperature anomalies
; South pacific convergence zones
; Thermodynamic changes
; Oceanography
; air-sea interaction
; El Nino-Southern Oscillation
; meridional circulation
; precipitation (climatology)
; rainfall
; sea surface temperature
; temperature anomaly
; Pacific Ocean
; Pacific Ocean (Tropical)
英文摘要: El Niño-Southern Oscillation strongly influences the interannual variability of rainfall over the Pacific, shifting the position and orientation of the South Pacific convergence zone (SPCZ) and intertropical convergence zone (ITCZ). In 1982/83 and 1997/98, very strong El Niño events occurred, during which time the SPCZ and ITCZ merged into a single zonal convergence zone (szCZ) extending across the Pacific at approximately 58S. The sea surface temperature anomalies (SSTAs) reached very large values and peaked farther east compared to other El Niño events. Previous work shows that tropical Pacific precipitation responds nonlinearly to changing the amplitude of the El Niño SSTA even if the structure of the SSTA remains unchanged, but large canonical El Niño SSTAs cannot reproduce the szCZ precipitation pattern. This study conducts idealized, SST-forced experiments, starting with a large-amplitude canonical El Niño SSTA and gradually adding a residual pattern until the full (1982/83) and (1997/98) mean SST is reproduced. Differences between the canonical and strong El Niño SSTA patterns are crucial in generating an szCZ event. Three elements influence the precipitation pattern: (i) the local meridional SST maxima influences the ITCZ position and western Pacific precipitation, (ii) the total zonal SST maximum influences the SPCZ position, and (iii) the equatorial Pacific SST influences the total amount of precipitation. In these experiments, the meridional SST gradient increases as the SSTAs approach szCZ conditions. Additionally, the precipitation changes evident in szCZ years are primarily driven by changes in the atmospheric circulation, rather than thermodynamic changes. The addition of a global warming SST pattern increases the precipitation along the equator and shifts the ITCZ farther equatorward. © 2015 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50487
Appears in Collections: 气候变化事实与影响
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作者单位: Centre for Australian Weather and Climate Research, Bureau of Meteorology, Melbourne, VIC, Australia
Recommended Citation:
Chung C.T.Y.,Power S.B.. Modelled rainfall response to strong El Niño sea surface temperature anomalies in the tropical pacific[J]. Journal of Climate,2015-01-01,28(8)