Changes in the relationship between summer rainfall over Japan and the North Pacific subtropical high
Changes in the relationship between summer rainfall over Japan and the North Pacific subtropical high
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日本夏季降水与北太平洋副热带高压关系的变化
DOI：
10.1002/joc.4915
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Rena Nagata and Takehiko Mikami
中科院分区：
文献类型：
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作者：
S. Khoirul Himmi;Tsuyoshi Yoshimura;Yoshiyuki Yanase;Masao Oya;Toshiyuki Torigoe and Setsuo Imazu;大澤 潤，中野 冠;Rena Nagata and Takehiko Mikami
研究了1901-2000年日本夏季降水与北太平洋副热带高压西缘关系的年代际变化。在这项研究中，描述NPSH西部边缘纬向和纬向位移的指数（分别为NPSHI-Z和NPSHI-M）用于分析。与1950年以后NPSH的西南移动相一致，夏季降水与NPSHI-Z之间有显著相关性的区域也向西南移动，从50年以前（1901-1950）的本州中部太平洋一侧移动到50年以后（1951-2000）的九州附近。此外，夏季降水和NPSHI-M之间的显着联系被广泛观察到后50，而这些现象之间没有显着的关系被检测到在前50。确定的变化可能是由于太平洋-日本（PJ）模式和NPSHI-M之间的关系发生变化。发现1950年PJ型有一个转折点，之后NPSHI-M与PJ型的关系变强。
Interdecadal changes in the relationship between summer rainfall over Japan and the western edge of the North Pacific subtropical high (NPSH) were investigated for the 1901–2000 period. In this study, indices describing the zonal and meridional displacement of the western edge of the NPSH (NPSHI‐Z and NPSHI‐M, respectively) were used for the analysis. Consistent with the southwestward shift of the NPSH after 1950, the region with a significant correlation between summer rainfall and the NPSHI‐Z has shifted southwestward, from the Pacific side of central Honshu in the pre50 (1901–1950) to around Kyushu in the post50 (1951–2000). Moreover, a significant connection between summer rainfall and the NPSHI‐M was widely observed in the post50, whereas no significant relationship between these phenomena was detected in the pre50. The identified change was likely due to the change in the relationship between the Pacific‐Japan (PJ) pattern and the NPSHI‐M. It is found that there is a change point in 1950 for the PJ pattern and after that the relationship between the NPSHI‐M and PJ pattern has become stronger.