The Effect of summer tropical heating on the location and intensity of the extratropical westerly jet streams
The Effect of summer tropical heating on the location and intensity of the extratropical westerly jet streams
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DOI：
10.1029/jd095id11p18705
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发表时间：
1990-10
影响因子：
--
通讯作者：
Song Yang;P. Webster
中科院分区：
文献类型：
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作者：
Song Yang;P. Webster
本文研究了夏半球热带非绝热加热对冬半球副热带和热带外西风急流位置和强度的作用。特别是，热带外纬向风，副热带纬向风和热带出射长波辐射（OLR）之间的关系进行了研究。结果表明，加热场、越赤道纬向风和冬季纬向风极大值在年尺度和年际尺度上有着密切的联系。这些因素表明，在确定西风急流的位置和大小方面，邻近半球的加热至少与北方的地形一样重要。通过注意到北方加热模式与南半球急流的位置和变化之间的类似联系，增加了这一结论的可信度，而南半球急流与地形的联系不太明显。此外，西风急流位置和强度的年际变化与厄尔尼诺/南方涛动（ENSO）现象密切相关。因此，除了众所周知的ENSO和近赤道或对称纬向环流之间的关系外，在同一时间尺度上，越赤道气流或赤道周围的非对称分量也有很强的关联。
The role of the summer hemisphere tropical diabatic heating on the location and magnitude of the winter hemisphere subtropical and extratropical westerly jet streams is studied. In particular, the relationships between the extratropical zonal wind, the subtropical meridional wind and the tropical outgoing longwave radiation (OLR) patterns are examined. It is found that the heating field, the cross-equatorial meridional wind, and the winter zonal wind maxima are closely linked on annual and interannual time scales. These factors indicate that the adjacent hemisphere heating is at least as important as the northern hemisphere orography in determining the location and magnitude of the westerly jet streams. Credence is added to this conclusion by noting the similar associations between the northern hemisphere heating pattern and the location and variations of the southern hemisphere jet streams which are less clearly associated with orography. Furthermore, interannual changes in the location and magnitude of the westerly jet streams are closely related to the El Nino/Southern Oscillation (ENSO) phenomenon. Thus, in addition to the well known relationship between ENSO and the near-equatorial or symmetric zonal circulation, there is a strong association on the same time scale in the cross-equatorial flow or asymmetric components about the equator.