利用NCEP/NCAR再分析资料、 AO指数序列、 全球SST资料以及全国160站月降水量资料, 分析了1951/1952-2007/2008年我国冬季降水与AO指数的相互关系及其年代际变化。结果表明, 我国冬季降水与AO的相关关系在1978/1979-1989/1990年非常显著。通过回归分析得出, 1978/1979-1989/1990年AO与500 hPa东亚大槽密切相关, 当AO偏强时, 东亚大槽偏弱, 西伯利亚高压偏弱, 冬季风偏弱, 低层我国东北地区有一异常反气旋, 异常环流西南侧偏南、 偏东风分量增强, 有利于从西北太平洋和孟加拉湾向我国中部、 东部输送水汽, 影响冬季降水。东赤道太平洋SST可能对我国冬季降水与AO关系年代际变化有影响, 当降水与AO的相关关系偏强时, 降水与SST的相关关系则偏弱; 1951/1952-1977/1978年和1990/1991-2007/2008年, SST与500 hPa副热带高压密切相关, 当SST偏高时, 副热带高压偏强, 低层我国东部沿海、 南海地区南风分量偏强, 有利于向我国东南地区输送暖湿气流, 影响东南地区冬季降水。
Abstract
Using the NCEP/NCAR reanalysis data, the series of AOI(Arctic Oscillation Indices), global SST data, and the observed precipitation at 160 stations of China, the correlation and its interdecadal variation of the AOI and winter precipitation of China in 1951/1952-2007/2008 have beenstudied. The results show that the correlation coefficientsbetween winter precipitation and AOI are high during 1978/1979-1989/1990.By regression, it isfound that the correlation between AO and the East Asian trough isextremely high in this period. Associated with the positive AO, the East Asia trough, Siberian high and East Asia winter monsoon areall weaker. In lower level, there is an anticyclonic circulation anomaly in the Northeast China, and on its southwest side the southeast\|ward wind components areenhanced. So it isfavorable to themoisture transfer from Northwest Pacific ocean and the Bay of Bengal to middle and east parts of China, which influent on the precipitation in winter.In addition, SST of equatorial east Pacific ocean might influent on the interdecadal variations of the relationship between winter precipitation in China and AO. Associated with the higher relationship between precipitation and AO, the relationship between precipitation and SST islower. During 1951/1952-1977/1978 and 1990/1991-2007/2008, there isa high correlation between SST and subtropic high. Associated with the higher SST, subtropic high isstronger. In lower level, south wind components in the coastal region of east China and South China Sea areenhanced, which isfavorable to the warm current tranfer to the southeast regions of China. Which influent on winter precipitation in the southeast regions of China.
关键词
我国冬季降水 /
北极涛动 /
年代际变化 /
SST
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Key words
Winter precipitation /
Arctic Oscillation /
Interdecadal variati /
SST
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