globalchange  > 气候变化事实与影响
DOI: 10.1175/JCLI-D-12-00786.1
Scopus记录号: 2-s2.0-84884255122
论文题名:
Recent Summer Rainfall Increase and Surface Cooling over Northern Australia since the Late 1970s: A Response to Warming in the Tropical Western Pacific
作者: Li X.-F.; Yu J.; Li Y.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期:18
起始页码: 7221
结束页码: 7239
语种: 英语
Scopus关键词: Atmospheric general circulation models ; Australian continents ; Controlling factors ; North-east australia ; North-East Indian Ocean ; Sea surface temperature (SST) ; South Indian Ocean ; Tropical Western Pacific ; Cooling ; Oceanography ; Storms ; Wetting ; Rain ; air-sea interaction ; atmospheric general circulation model ; atmospheric modeling ; cooling ; cyclone ; numerical model ; rainfall ; sea surface temperature ; summer ; temperature anomaly ; trend analysis ; warming ; Australia ; Indian Ocean ; Indian Ocean (Northeast) ; Indian Ocean (South) ; Pacific Ocean ; Pacific Ocean (Tropical) ; Pacific Ocean (West)
英文摘要: Rainfall over northern Australia (NA) in austral summer is the largest water source of Australia. Previous studies have suggested a strong zonal-dipole trend pattern in austral summer rainfall since 1950, with rainfall increasing in northwest Australia (NWA) but decreasing in northeast Australia (NEA). The dynamics of rainfall increase in NWA was linked to sea surface temperature (SST) in the south Indian Ocean and the rainfall decrease in NEA was associated with SST in the northeast Indian Ocean. This study reports that, in contrast to a zonal-dipole trend pattern, a dominant wetting pattern over NA has recently been observed in the post-1979 satellite era. The recentNArainfall increase also manifests as the first leading mode of summer rainfall variability over the Australian continent. Further investigation reveals that SST in the tropical western Pacific (TWP) has replaced the SST in the south and northeast Indian Ocean as the controlling factor responsible for the recent NA rainfall increase. Direct thermal forcing by increasing TWP SST gives rise to an anomalous Gill-type cyclone centered around NA, leading to anomalously high rainfall. As such, the increasing SST in theTWPinduces over 50% of the observed rainfall wetting trend over NA. The increased rainfall in turn induces land surface cooling in NA. This mechanism can be confirmed with results obtained from sensitivity experiments of a numerical spectral atmospheric general circulation model. Thus, increasing SST in the TWP has contributed much of the recent summer rainfall increase and consequently the surface cooling over NA. © 2013 American Meteorological Society.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51666
Appears in Collections:气候变化事实与影响

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作者单位: State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; National Meteorological Information Center, State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; Mathematics, Informatics and Statistics, CSIRO Climate Adaptation Flagship, Floreat, WA, Australia

Recommended Citation:
Li X.-F.,Yu J.,Li Y.. Recent Summer Rainfall Increase and Surface Cooling over Northern Australia since the Late 1970s: A Response to Warming in the Tropical Western Pacific[J]. Journal of Climate,2013-01-01,26(18)
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