阿拉伯海热带气旋生成特征分析
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通信作者:李畅,男,硕士研究生,现从事台风与中小尺度气象研究,co1ddew0927@163.com。

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国家重点研发计划项目(2019YFC1510400);国家自然科学基金项目(41930967,41975054,41790471);中国科学院战略性先导科技专项(XDA20100304)


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Characteristics of tropical cyclones genesis in the Arabian Sea
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    摘要:

    利用印度气象局(India Meteorological Department,IMD)、国际气候管理最佳路径档案库(International Best Track Archive for Climate Stewardship,IBTrACS)提供的1982—2020年阿拉伯海热带气旋路径资料,美国国家环境预报中心(National Centers for Environmental Prediction,NCEP)再分析资料,对近39 a阿拉伯海热带气旋源地和路径特征、活跃区域、频数及气旋累积能量(accumulated cyclone energy,ACE)指数的季节特征和年际变化特征进行分析,并结合环境因素,说明其物理成因。结果表明:阿拉伯海热带气旋多发于10°~25°N,65°~75°E海域,5—6月、9—12月发生频数较高且强度较强,1—4月、7—8月发生频数较低且气旋近中心最大风速均小于35 kn;频数的季节变化主要受控于垂直风切变要素;阿拉伯海热带气旋发生频数和ACE近年有上升趋势,年际变化主要受控于海面温度(sea surface temperature,SST)和850 hPa相对湿度要素。

    Abstract:

    Based on the track data of tropical cyclones in the Arabian Sea from 1982 to 2020 provided by the India Meteorological Department (IMD) and the International Best Track Archive for Climate Stewardship (IBTrACS), and the reanalysis data provided by the National Centers for Environmental Prediction (NCEP) , the source and track characteristics, active area, seasonal and interannual variation characteristics of frequency and accumulated cyclone energy (ACE) index of tropical cyclones in the Arabian Sea in recent 39 years are analyzed, and the physical causes are explained in combination with environmental factors. The results show that tropical cyclones in the Arabian Sea mostly occur in the sea area of 10°~25°N, 65°~75°E. The frequency and intensity of tropical cyclones are high from May to June and September to December. In contrast, from January to April and July to August, the frequency of tropical cyclones is low, and the maximum wind speed near the center of cyclones is less than 35 kn. It is found that the seasonal variation of frequency of tropical cyclones is mainly controlled by vertical wind shear, while interannual variation is mainly controlled by sea surface temperature (SST) and 850 hPa relative humidity. The occurrence frequency and ACE of tropical cyclones in the Arabian Sea are increasing in recent years.

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李畅,姜霞,沈新勇.阿拉伯海热带气旋生成特征分析[J].海洋气象学报,2021,41(4):62-72.

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  • 在线发布日期: 2021-12-23
  • 出版日期: 2021-11-30

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