Rainfall asymmetries of the western North Pacific tropical cyclones as inferred from GPM,International Journal of Climatology

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Rainfall asymmetries of the western North Pacific tropical cyclones as inferred from GPM
International Journal of Climatology ( IF 3.5 ) Pub Date : 2021-04-11 , DOI: 10.1002/joc.7136
Junyi Liang _{1,

2} , Kelvin T. F. Chan _{1,

2,

3}

Affiliation

It has been revealed that the vertical wind shear (VWS) can result in the rainfall asymmetry of tropical cyclone (TC), where the VWS is conventionally defined as the environmental horizontal winds between 200- and 850-hPa levels within a certain area from the TC centre. The rainfall maximum is generally displaced downshear to downshear-left side in the Northern Hemisphere or downshear to downshear-right side in the Southern Hemisphere. Here, we revisit the rainfall asymmetries of TCs over the western North Pacific using the state-of-art Global Precipitation Measurement data. Observations pose that using the conventional VWS to interpret the TC rainfall asymmetry is inopportune. The conventional VWS can only largely grasp the rainfall asymmetry in the inner core of TC, but not in the outer core. We, therefore, explicitly propose a new VWS, namely the effective VWS, to fill this gap. The effective shear layer responsible for the rainfall asymmetry is a function of TC intensity and core region. In addition, we suggest that the angle difference between the effective shears for the inner-core and outer-core rainfall asymmetries can help to comprehend the spirality of the rainfall asymmetries that are, the fashions, or patterns of the rainbands. Meanwhile, the moisture flux convergence and storm motion show little effect on the rainfall asymmetry. This study advances the understanding of TC rainfall asymmetry and provides scientific support for disaster prediction, prevention, and mitigation.

中文翻译：

从 GPM 推断出的西北太平洋热带气旋的降雨不对称性

已经揭示，垂直风切变（VWS）会导致热带气旋（TC）的降雨不对称，其中 VWS 传统上定义为距热带气旋一定区域内 200 至 850 hPa 水平之间的环境水平风。技术中心。降雨最大值通常在北半球向下剪切到向下剪切左侧或在南半球向下剪切到向下剪切右侧。在这里，我们使用最先进的全球降水测量数据重新审视北太平洋西部 TC 的降雨不对称性。观测表明，使用传统的 VWS 来解释 TC 降雨不对称是不合时宜的。常规VWS只能在很大程度上掌握TC内核的降雨不对称性，而不能掌握外核的降雨不对称性。因此，我们明确提出了一个新的 VWS，即有效的 VWS，以填补这一空白。造成降雨不对称的有效剪切层是 TC 强度和核心区域的函数。此外，我们建议内核和外核降雨不对称的有效切变之间的角度差异有助于理解降雨不对称的螺旋性，即雨带的形式或模式。同时，水分通量辐合和风暴运动对降雨不对称性影响不大。本研究增进了对台风降雨不对称性的认识，为灾害预测、防灾减灾提供了科学依据。我们认为内核和外核降雨不对称的有效切变之间的角度差异有助于理解降雨不对称的螺旋性，即雨带的形式或模式。同时，水分通量辐合和风暴运动对降雨不对称性影响不大。该研究加深了对台风降雨不对称性的认识，为灾害预测、防灾减灾提供了科学依据。我们认为内核和外核降雨不对称的有效切变之间的角度差异有助于理解降雨不对称的螺旋性，即雨带的形式或模式。同时，水分通量辐合和风暴运动对降雨不对称性影响不大。该研究加深了对台风降雨不对称性的认识，为灾害预测、防灾减灾提供了科学依据。

更新日期：2021-04-11

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