ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Analysis of Typhoon Characteristics in the Huanghai and Bohai Sea from 1949 to 2020
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Abstract:
Utilizing Best-track data of typhoon provided by the China Meteorological Administration (CMA), this paper conducts an analysis of the climatic characteristics of typhoons (TCs) entering the Huanghai and Bohai Sea regions (110～130°E, 30～50°N) from 1949 to 2020. The results indicate that, on average, 4.3 TCs enter the Huanghai and Bohai Sea (HBS) annually. It shows a significant increasing trend in the percentage of HBS TCs in the western North Pacific typhoons (WNP TCs). HBS TCs are active only between April and November. Since the 1990s, there has been an increase in HBS TC activity during autumn. The primary genesis region for HBS TCs is located between 5°N to 30°N and 120°E to 160°E. Since the 1950s, it has been continuously shrinking westward. Prior to the 1980s, there was a gradual northward trend, which was followed by a southward trend accompanied by the phenomenon of "autumn expansion" after the 1990s. Most HBS TCs enter the HBS via distant sea tracks, traveling a considerable distance from land. Additionally, there are HBS TCs that change direction or move northward during their offshore or landing activities. The remaining HBS TCs either dissipate after landing, continue moving westward at high latitudes, or turn westward within the Yellow Sea. 51.8% of HBS TCs undergo extratropical transition, and among them, 28.6% strengthen after the transition. The intensification following extratropical transition mainly occurs from June to October, peaking in August and September. The central and southern regions of East China and the southern part of the Sea of Japan are the two main areas where such intensification is concentrated.
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