1950～2003年日长近120天准周期振荡和厄尔尼诺现象

介绍了小波振幅分析方法和小波振周谱分析方法的解析表达 ,然后利用小波振幅分析方法研究了195 0～ 2 0 0 3年日长近 12 0d准周期振荡的时频规律 (国际地球自转中心提供的 196 2～ 2 0 0 3年的日长变化以及根据美国环境预测中心提供的大气角动量换算的 195 0～ 2 0 0 3年大气激发的日长变化 )。此外 ,还利用小波振周谱分析方法研究了同一时段内厄尔尼诺 3、4区海水温度异常年际变化的时频特征 ,并将它与日长近12

Impact of Autumn SST in the Japan Sea on Winter Rainfall and Air Temperature in Northeast China

We studied the impact of sea surface temperature anomaly(SSTA) in the Japan Sea and the sea area east of Japan on the winter rainfall and air temperature in Northeast(NE) China using the singular value decomposition(SVD) and empirical orthogonal function(EOF). The monthly-mean rainfall data observed at 160 stations in China, monthly-mean sea surface temperature(SST) of the Hadley Center for Climate Prediction and Research and monthly-mean air temperature from the NCEP reanalysis during 1960–2011 were used. Correlation analysis indicates that the SSTAs in the Japan Sea in September may last for three or four months and are an important index for forecasting the winter rainfall and air temperature in NE China. Positive SSTAs in the central Japan Sea and in the sea area east of Tokyo correspond to positive rainfall anomaly and negative air temperature anomaly in NE China. With the rise of SST in the Japan Sea, a weak cyclone appears over the Japan Sea. The northeasterly wind transports water vapor from the Okhotsk to NE China, resulting in more rainfall and lower air temperature. Negative SSTA years are accompanied by warmer air temperature and less snow in NE China. The 1000 h Pa geopotential height anomaly and wind anomaly fields are simulated by IAP-9L model, which supports the analysis results.

雾锁东南亚

今年八月初以来,一场被称为全国性灾难的森林大火席卷了印度尼西亚的加里曼丹和苏门答腊群岛,这场持续了二个多月并在继续燃烧的大火,已使至少30万公顷的森林化为灰烬,75万公顷林地被灼焦、毁坏,许多珍稀野生动物也遭受着灭顶之灾,严重破坏了生态平衡。大火更使得东南亚时刻处于浓烟的笼罩中,那些在令人心惊胆颤的东南亚金融危机中艰难度日的善良的人们又在“暗无天日”的日子里时刻面临着浓烟对健康和生命造成的威胁。目前,已有6人因烟雾引起呼吸系统综合症死亡。