Combined Effect of the PDO and ENSO on the Date of the First Tropical Cyclone Landfall in Continental East Asia,Journal of Geophysical Research: Atmospheres

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Combined Effect of the PDO and ENSO on the Date of the First Tropical Cyclone Landfall in Continental East Asia
Journal of Geophysical Research: Atmospheres ( IF 4.4 ) Pub Date : 2021-05-03 , DOI: 10.1029/2020jd034059
Shuang Li _{1,

2} , Ziniu Xiao ₁ , Yuchun Zhao ₃

Affiliation

The date of the first tropical cyclone (TC) landfall (DFTCL) is important for TC disaster prevention. This study analyzes the variation in the characteristics of the DFTCL in continental East Asia and investigates the possible effect of the Pacific Decadal Oscillation (PDO) and the El Niño‐Southern Oscillation (ENSO) on the DFTCL. Results show that the combined effect of the PDO and ENSO plays an important role in whether TC landfall occurs relatively earlier or later. During negative PDO phases, the DFTCL is impacted significantly by ENSO events. TCs tend to make landfall later (earlier) in the years following El Niño (La Niña). However, little influence is noticeable for the ENSO events during positive PDO phases. The combined effect is possibly associated with the anomalous anticyclone (cyclone) in the western North Pacific (South China Sea) which is modulated by different PDO phases asymmetrically. During negative PDO phases, the tropical Indian Ocean (TIO) has a strong response to El Niño events in winter. The warm anomaly persists in the following months until early summer. This induces the anomalous anticyclone in the western North Pacific which is enhanced by the anomalous meridional circulation. The anomalous anticyclone can suppress TC genesis and landfall. On the other hand, the TIO has a significant cooling response to La Niña events and induces the anomalous cyclone near the South China Sea. The anomalous cyclone favors earlier than usual TC genesis and landfall. However, this relationship cannot be detected in the positive PDO phase.

更新日期：2021-05-10

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