Influence of different types of ENSO events on the tropical cyclone rainfall over the western North Pacific

Tropical cyclone (TC) rainfall (TCR) over the western North Pacific (WNP) in TC peak season shows diverse responses to different El Niño flavors. Accumulated TCR increases over the low latitude regions (northwestern quadrant) of the WNP in eastern Pacific (central Pacific) El Niño but decreases over...

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Bibliographic Details
Published in:Climate dynamics 2023-06, Vol.60 (11-12), p.3969-3982
Main Authors: Chen, Xu, Guo, Yi-Peng, Tan, Zhe-Min, Zhao, Jiuwei
Format: Article
Language:English
Subjects:
Climatology
Cyclones
Distance
Earth and Environmental Science
Earth Sciences
El Nino
El Nino phenomena
El Nino-Southern Oscillation event
Environmental aspects
Geophysics/Geodesy
Hurricanes
La Nina
Oceanography
Offshore
Precipitation
Rain and rainfall
Rainfall
Southern Oscillation
Steering
Translation
Tropical cyclone intensities
Tropical cyclone rainfall
Tropical cyclones
Vertical wind shear
Vorticity
Wind shear
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Summary:Tropical cyclone (TC) rainfall (TCR) over the western North Pacific (WNP) in TC peak season shows diverse responses to different El Niño flavors. Accumulated TCR increases over the low latitude regions (northwestern quadrant) of the WNP in eastern Pacific (central Pacific) El Niño but decreases over the entire basin in La Niña years. TCR hours are the primary causes of the variations in accumulated rainfall, while TCR rate takes second place. TCR hours are closely related to the total duration of TCs, which can be attributed to the slower translation speed and the longer TC travelling distance in eastern Pacific El Niño, but the increased (decreased) TC number for central Pacific El Niño (La Niña). Meanwhile, the TCR rate is closely related to TC intensity and 850 hPa vorticity. In eastern Pacific El Niño years, the decrease in steering flow and the southeastward displacement of TC genesis locations cause the changes in translation speed and travelling distance over the WNP, and the increased TC intensity over the offshore regions of eastern China. In central Pacific El Niño years, the easterly anomaly of midlatitude steering flow causes the increased TC number entering the corresponding region, and the increase of 850 hPa vorticity over the WNP basin leads to the enhanced TC intensity. In La Niña years, the combined effects of decreased 850 hPa vorticity and enhanced vertical wind shear over the Philippine Sea can result in the suppressed TC number and TC intensity.
ISSN:0930-7575
1432-0894
DOI:10.1007/s00382-022-06547-z