Global features of the Pacific-Japan Oscillation
Global features of the Pacific-Japan Oscillation
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DOI：
10.1007/bf01032585
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发表时间：
1989-03
影响因子：
2
通讯作者：
T. Nitta
中科院分区：
文献类型：
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作者：
T. Nitta
通过使用 6 年（1979-1984 年）的月平均全球数据来研究热带对流、海面温度（SST）和与太平洋-日本涛动（PJO）相关的大气环流的全球特征。结果表明，PJO并非局限于西太平洋的局地现象，而是与全球尺度的大气-海洋变化有关。PJO与热带太平洋海温年际变化高度相关。夏季，热带西太平洋出现正海温异常时，西太平洋特别是菲律宾附近的对流活动强烈增强，但整个赤道东太平洋的对流活动却因这些地区出现负海温异常而受到极大抑制。赤道太平洋沃克环流增强，两半球副热带太平洋均产生200 mb的双气旋单元。强反气旋环流发生在北部中纬度地区，从华东延伸至西北太平洋。北半球和南半球的其他温带地区也会产生异常环流。
Global features of tropical convection, sea surface temperature (SST) and atmospheric circulation associated with the Pacific-Japan Oscillation (PJO) are examined by using monthly mean global data for 6 years (1979–1984). It is shown that the PJO is not a local phenomena limited to the western-Pacific but related to global-scale atmosphere-ocean variations.The PJO highly correlates with interannual variations of SST in the tropical Pacific. During summers in which positive SST anomaly occurs in the tropical western Pacific, convective activity in the western Pacific especially near Philippines is strongly enhanced but that in the whole equatorial eastern Pacific is greatly suppressed due to negative SST anomaly in these areas.The Walker circulation is intensified in the equatorial Pacific and twin cyclonic cells at 200 mb are generated in the subtropical Pacific of both hemispheres. Strong anticyclonic circulations take place in the northern middle latitudes extending from East China to Northwest Pacific. Anomalous circulations are also generated in the other extratropical regions in the both Northern and Southern Hemispheres.