| 1998年区域性水汽输送及对流活动与副高活动变异的相关特征(英) |
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| 作者姓名： | XU Xiangde ZHOU Li ZHANG Shengjun MIAO Qiuju |
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| 作者单位： | Chinese Academy of Meteorological Sciences，Chinese Academy of Meteorological Sciences，Chinese Academy of Meteorological Sciences，Chinese Academy of Meteorological Sciences Beijing 100081，Beijing 100081，Beijing 100081，Beijing 100081 |
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| 基金项目： | This study is supported by the Huaihe River Basin Energy and Water Cycle Experiment and Study Project under Grant No. 49794030 and East Asian Monsoon Experiment (EAMEX) under Grant No. 2001CCB00400. |
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| 摘 要： | 根据1998年NCEP逐日资料和TBB逐日资料,探讨了低纬度对流活动和副高周边水汽输送及其对流活动对夏季西太平洋副热带高压季节性北跳、南撤的影响效应。研究表明:低纬热带对流加强,且110°-150°E地区的南北向垂直经圈环流下沉区北移,夏季西太平洋副热带高压有北跳现象。另外,诊断结果亦表明西太平洋副高周边纬向水汽输送的显著减弱亦预示将出现副高的北跳,而西太平洋地区低纬经向水汽输送减少一候之后,副高南撤。研究结果表明西太平洋副高北跳、南撤与低纬度的对流潜热释放、中纬西太平洋副高周边的水汽输送及其对流活动存在密切的关系。数值模拟结果进一步证实上述副高活动变异与前期水汽输送及其对流特征的相关关系。
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| 关 键 词： | 西太平洋副热带高压 季节性北跳和南撤 低纬度对流 水汽输送 |
| 收稿时间： | 18 January 2002 |
Characteristics of the correlation between regional water vapor transport along with the convective action and variation of the Pacific subtropical high in 1998 |
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| XU Xiangde,ZHOU Li,ZHANG Shengjun,MIAO Qiuju.Characteristics of the correlation between regional water vapor transport along with the convective action and variation of the Pacific subtropical high in 1998[J].Advances in Atmospheric Sciences,2003,20(2):269-283. |
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| Authors: | Xiangde Xu Li Zhou Shengjun Zhang Qiuju Miao |
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| Institution: | Chinese Academy of Meteorological Sciences, Beijing 100081,Chinese Academy of Meteorological Sciences, Beijing 100081,Chinese Academy of Meteorological Sciences, Beijing 100081,Chinese Academy of Meteorological Sciences, Beijing 100081 |
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| Abstract: | This paper explores the impact of the convective action over the low-latitude region, the water vapor transport around the West Pacific subtropical high (WPSH), and its convective action on the seasonal northward jump and southward withdrawal of the WPSH in summer by using the daily data set of NCEP and TBB for 1998. The research shows that in summer, the WPSH moves northward when the convection over the low-latitude tropical region intensifies and the subsidence region of the meridional vertically vertical circulation in meridional direction circulation over the region of 110°-150°E moves northward. Furthermore, as revealed by diagnostic analysis, the subtropical high moves northward after the obvious weakening of the longitudinal water vapor transport over the region around the subtropical high, but withdraws southward a pentad after the reduction of the latitudinal water vapor transport over the tropical West Pacific region. The research results show that the northward jump and southward withdrawal of the WPSH are closely related to the release of the convective latent heat at low latitudes and the water vapor transport at boundaries around WPSH and its convective action. The numerical simulation further validates the above-mentioned correlation between the variation of the action of the subtropical high and the preceding water vapor transport along with the convection characteristics. |
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| Keywords: | West Pacific subtropical high seasonal northward jump and southward withdrawal convection over low-latitudes water vapor transport |
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