Influence of El Niño decaying pace on low latitude tropical cyclogenesis over the western North Pacific,International Journal of Climatology

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Influence of El Niño decaying pace on low latitude tropical cyclogenesis over the western North Pacific
International Journal of Climatology ( IF 3.5 ) Pub Date : 2021-07-07 , DOI: 10.1002/joc.7288
Changhao Lu ₁ , Xuyang Ge ₁ , Melinda Peng ₂ , Tim Li ₃

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The modulation of El Niño decaying pace on tropical cyclones (TCs) activities at low latitude (within 10°) over the western North Pacific (WNP) is investigated in this study. During rapidly decaying El Niño events, fewer TCs occur near the equator and the averaged genesis location is more westward. More TCs are found in the southeast of WNP during slowly decaying phase of El Niño events. The distinctive differences of TC genesis frequency and their respective meridional positions are related to the modulation of El Niño to large-scale environmental flows. Both dynamical and thermodynamical conditions, such as low-level vorticity, mid-level relative humidity and vertical motion, are favourable for TC genesis in the southeast of WNP during slowly decaying El Niño events. The differences of sea surface temperature, vertical wind shear, and TC heat potential between the two El Niño events are similar to the spatial distribution of TC genesis at low latitude. Disturbances in southeastern WNP in slowly decaying El Niño events are more likely to develop into TCs due to the stronger zonal convergence and meridional shear of zonal wind. These findings may help to better understand the interaction between low-latitude TCs and El Niño. The higher frequency of low-latitude TC genesis and their more eastward TC genesis position in slowly decaying El Niño events may in turn slow down the transition speed of El Niño.

中文翻译：

厄尔尼诺衰减速度对北太平洋西部低纬热带气旋的影响

本研究研究了厄尔尼诺衰减速度对北太平洋西部（WNP）低纬度（10°以内）热带气旋（TC）活动的调节。在快速衰减的厄尔尼诺事件中，赤道附近发生的 TC 较少，平均成因位置更偏西。在厄尔尼诺事件的缓慢衰减阶段，在WNP东南部发现了更多的TC。热带气旋发生频率及其经向位置的显着差异与厄尔尼诺现象对大尺度环境流的调制有关。在缓慢衰减的厄尔尼诺事件中，低涡度、中层相对湿度和垂直运动等动力学和热力学条件都有利于西太平洋东南部 TC 的形成。海面温度、垂直风切变、两次厄尔尼诺事件之间的热带气旋热势和热带气旋热势与低纬地区热带气旋成因的空间分布相似。由于纬向辐合和纬向风的经向切变较强，在缓慢衰减的厄尔尼诺事件中，WNP东南部的扰动更有可能发展成TC。这些发现可能有助于更好地理解低纬度TC与厄尔尼诺之间的相互作用。在缓慢衰减的厄尔尼诺事件中，低纬度台风成因频率较高，台风成因位置更偏东，可能反过来减缓厄尔尼诺现象的过渡速度。由于纬向辐合和纬向风的经向切变较强，在缓慢衰减的厄尔尼诺事件中，WNP东南部的扰动更有可能发展成TC。这些发现可能有助于更好地理解低纬度TC与厄尔尼诺之间的相互作用。在缓慢衰减的厄尔尼诺事件中，低纬度台风成因频率较高，台风成因位置更偏东，可能反过来减缓厄尔尼诺现象的过渡速度。由于纬向辐合和纬向风的经向切变较强，在缓慢衰减的厄尔尼诺事件中，WNP东南部的扰动更有可能发展成TC。这些发现可能有助于更好地理解低纬度TC与厄尔尼诺之间的相互作用。在缓慢衰减的厄尔尼诺事件中，低纬度台风成因频率较高，台风成因位置更偏东，可能反过来减缓厄尔尼诺现象的过渡速度。

更新日期：2021-07-07

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