北太平洋高纬地区准4年尺度西风异常对热带太平洋海温的影响

EFFECT OF NORTHERN PACIFIC HIGH LATITUDE WESTERLY ANOMALY ON TROPICAL PACIFIC SSTA ON QUASI 4 YEAR TIME SCALE

利用１９７５ 年１月～１９８７年１２月ＮＭＣ的８５０ ｈＰａ风场资料进行诊断分析，发现在热带中东太平洋ＳＳＴＡ出现正异常前期， 北太平洋就已有异常西风存在。该地区的异常纬向风在准４年时间尺度上取先西南后东南的折形路径向南传播。而且。

A diagnostic analysis has been conducted based on the January 1975-December 1987 NMC 850hPa wind field data. The results show that the northern Pacific high latitude anomalous westerly on the quasi 4 year time scale, which occurs ahead of the beginning of the positive tropical central/eastern Pacific SSTA, propagates southward along a zigzag path,i.e., first southwest then southeast and so does the Aleutian SSTA.