Modulation of Tropical Cyclogenesis Location and Frequency over the Indo–Western North Pacific by the Intraseasonal Indo–Western Pacific Convection Oscillation during the Boreal Extended Summer
Modulation of Tropical Cyclogenesis Location and Frequency over the Indo–Western North Pacific by the Intraseasonal Indo–Western Pacific Convection Oscillation during the Boreal Extended Summer
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DOI：
10.1175/jcli-d-17-0085.1
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发表时间：
2017-11
影响因子：
4.9
通讯作者：
Qiuyun Wang;Jianping Li;Yanjie Li;Jingwen Zhang;Jiayu Zheng
中科院分区：
文献类型：
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作者：
Qiuyun Wang;Jianping Li;Yanjie Li;Jingwen Zhang;Jiayu Zheng
本文探讨了北太平洋延伸期(5-10月)季内印度-西太平洋对流振荡(IPCO)对热带气旋(TC)生成、位置和频率的影响。观测分析表明，季节内IPCO对印支纬向热带气旋的影响包括明显的“热带气旋起源位置的位相锁定”和明显的热带气旋频率差异。在WNP中，季节内正IPCO位相，大气通过积云对流凝结释放潜热获得热量，而异常的气旋性环流减弱了西太平洋副热带高压(WPSH)，增强了TC的生成，从而倾向于产生更多的TC。此外，西太平洋涛动的减弱和异常气旋环流中心的西移将热带气旋的生成位置锁定在西北偏西和较低纬度(5°-20°N附近)，尤其是在南中国海。几乎相反的情况发生在一个否定的……
AbstractThe influence of the intraseasonal Indo–western Pacific convection oscillation (IPCO) on tropical cyclone (TC) genesis location and frequency over the Indo–western North Pacific (WNP) during the boreal extended summer (May–October) is explored. Observational analysis shows that the impacts of the intraseasonal IPCO on TCs over the Indo–WNP include an evident “phase lock of TC genesis location” and distinct differences in TC frequency. In the WNP, in the positive intraseasonal IPCO phase, the atmosphere gains heat through the release of latent heat in cumulus convective condensation, and the anomalous cyclonic circulation weakens the western Pacific subtropical high (WPSH) and enhances TC genesis, thereby tending to produce many more TCs. Moreover, the diminished WPSH and the westward shift of the centers of anomalous cyclonic circulations lock TC genesis locations to the west WNP and lower latitudes (around 5°–20°N), especially in the South China Sea. The almost opposite situation occurs in a nega...