Abstract
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.
Highlights
As one of the most destructive weather systems on Earth, tropical cyclones (TCs) often cause significant human and property loss in coastal areas
10% during the period 1949–2016 [10]. He speculated that the slowdown of TC translation speed may be caused by the weakening of summertime tropical circulation affected by the anthropogenic warming
The changes in annual mean TC translation speed over the western North Pacific are showed in Atmosphere 2020, 11, x FOR PEER REVIEW
Summary
As one of the most destructive weather systems on Earth, tropical cyclones (TCs) often cause significant human and property loss in coastal areas. Chan disagreed with Kossin and believed that the introduction of satellite capabilities since 1970s could influence that results to a great degree He even found a significant speedup of global TC translation speed over land after 1970 [14]. For the studies of trends in TC behavior over the western North Pacific, there existed significant discrepancies in the results based on different datasets [16,17,18,19,20,21]. This presents the question whether the trends in translation speed result from the discrepancies in TC best-track dataset themselves.
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