A Dynamic Index for the Westward Ridge Point Variability of the Western Pacific Subtropical High during Summer

A Dynamic Index for the Westward Ridge Point Variability of the Western Pacific Subtropical High during Summer
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夏季西太平洋副热带高压西移脊点变化的动态指数

DOI:
10.1175/jcli-d-16-0434.1
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发表时间:
2017-04
期刊:
影响因子:
4.9
通讯作者:
Cao Jie
Cao Jie
中科院分区:
地球科学2区
文献类型:
--
作者:
Yang Ruowen;Xie Zhiang;Cao Jie

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摘要 基于西太平洋副热带高压脊线和梯度风近似理论,定义了西太平洋副热带高压西向脊点(WRPI)动力指数。根据其定义,新的动态指数可用于分析大多数等压面在不同时间尺度上副高的演化。 WRPI 包括标记为 ZWRPI 和 MWRPI 的两个维度,分别描述副高西脊点的纬向和经向运动。利用大气环流、出射长波辐射、地表气温和降雨数据的再分析验证了动态指标的合理性和可靠性。 WRPI系列显示,副高西脊点总体上向极前进,向东后退。此外,WRPI与大气环流、出射长波辐射以及东亚和西太平洋夏季降水之间也存在着密切的关系。重要的合作...
AbstractBased on the ridge line of the western Pacific subtropical high (WPSH) and the theory of gradient wind approximation, a dynamic index for the westward ridge point (WRPI) of the WPSH is defined. Owing to its definition, the new dynamic index can be used to analyze the evolution of the WPSH at various time scales over most isobaric surfaces. The WRPI comprises two dimensions labeled ZWRPI and MWRPI, which depict the zonal and meridional movement, respectively, of the westward ridge point of the WPSH. The rationality and reliability of the dynamic index were validated using reanalysis atmospheric circulation, outgoing longwave radiation, surface air temperature, and rainfall data. The WRPI series revealed that the westward ridge point of the WPSH generally advances poleward while withdrawing eastward. Furthermore, there were close relationships between the WRPI, atmospheric circulation, outgoing longwave radiation, and precipitation over East Asia and the western Pacific in summer. The significant co...
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