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Changes in Tropical-Cyclone Translation Speed over the Western North Pacific

by Dongna Zhang 1,2, Han Zhang 2,3,*, Jiayu Zheng 4,5, Xuhua Cheng 1, Di Tian 2 and Dake Chen 2,3
1
College of Oceanography, Hohai University, Nanjing 210098, China
2
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
3
Southern Laboratory of Ocean Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China
4
State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
5
Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China
*
Author to whom correspondence should be addressed.
Atmosphere 2020, 11(1), 93; https://doi.org/10.3390/atmos11010093
Received: 8 December 2019 / Revised: 4 January 2020 / Accepted: 8 January 2020 / Published: 13 January 2020
(This article belongs to the Section Meteorology)
The trend of tropical-cyclone (TC) translation speed is a hot topic recently. Changes in TC translation speed during 1949–2017 over the western North Pacific are analyzed using two best-track datasets here. The TC translation speed decreased during 1949–2017, but there was no significant trend after 1981. The TC translation speed also changes with latitude and intensity. In the tropical ocean, TC translation speed decreased by 5.9% during 69-year recording period. North of 23.5° N, the changes in translation speed is highly consistent with the latitude of TC occurrence. The translation speed of tropical depressions showed no significant trend during the period 1949–2017, but the translation speed of typhoons decreased over the 69-year recording period. The period 1949–1981 contributed most of the slowdown trend. There also was an increase in the frequency of typhoons with translation speed slower than 6 m/s. The decrease of translation speed of typhoons before 1981 was likely caused by the weakening of the summertime tropical circulation. View Full-Text
Keywords: Western North Pacific; tropical cyclone; translation speed; latitude of TC occurrence; intensity Western North Pacific; tropical cyclone; translation speed; latitude of TC occurrence; intensity
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Zhang, D.; Zhang, H.; Zheng, J.; Cheng, X.; Tian, D.; Chen, D. Changes in Tropical-Cyclone Translation Speed over the Western North Pacific. Atmosphere 2020, 11, 93.

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