Effect of ENSO phase on the contribution of environmental variables to tropical cyclone genesis in the western North Pacific
Effect of ENSO phase on the contribution of environmental variables to tropical cyclone genesis in the western North Pacific
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DOI：
10.1002/joc.5966
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发表时间：
2019-01
期刊：
影响因子：
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通讯作者：
Chinh Ta‐Huu;Tomonori Sato
中科院分区：
文献类型：
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作者：
Chinh Ta‐Huu;Tomonori Sato
ENSO阶段之间大尺度环境变量的变化导致北太平洋西部（WNP）热带气旋（TC）特征（发生位置和频率）的变化。本研究探讨了TC发生年际变化对个别环境变量的敏感性，包括600‐hPa相对湿度（RH600）、海面温度（SST）、850‐hPa相对涡度（RV850）和垂直风切变（VWS）。采用轴对称模型模拟了1970—2015年16个ENSO年的气温变化。对照实验表明，轴对称模型可以捕捉到西北和东南扇区常规ENSO相的TC成因对比模式。敏感性实验表明，RV850和RH600在西北和东南扇区分别对ENSO相关的TC成因异常起主导作用。海温和VWS对TC成因异常的影响可以忽略不计。
Changes in large‐scale environmental variables between ENSO phases cause shifts in tropical cyclone (TC) features (genesis location and frequency) in the western North Pacific (WNP). This study examines the sensitivity of the interannual variation of TC genesis to individual environmental variables, including 600‐hPa relative humidity (RH600), sea surface temperature (SST), 850‐hPa relative vorticity (RV850), and vertical wind shear (VWS). An axisymmetric model was used to simulate TC genesis in 16 selected ENSO years during 1970–2015. The control experiment revealed that the axisymmetric model can capture a contrasting pattern of TC genesis between conventional ENSO phases in the northwest and southeast sectors of the WNP. The sensitivity experiments revealed that RH600 and RV850 play a dominant role in regulating ENSO‐related TC genesis anomalies in the northwest and southeast sectors, respectively. Meanwhile SST and VWS have negligible impact on TC genesis anomalies.