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廖菲,李文婷,张子然,苏冉,齐彦斌.1949-2017年南海海域热带气旋强度和路径快速变化统计特征[J].bet356官网下载_万博bet356手机版_bet356回复邮箱,2019,41(9):126-135
1949-2017年南海海域热带气旋强度和路径快速变化统计特征
Analysis of rapid changes of tropical cyclones over the South China Sea for 1949-2017
投稿时间:2018-07-30??修订日期:2018-10-31
DOI:10.3969/j.issn.0253-4193.2019.09.012
中文关键词:??热带气旋??强度??路径??快速变化??南海
英文关键词:tropical cyclones??intensity??path??rapid change??the South China Sea
基金项目:国家自然科学基金项目(41305029,41775140);广州市科技计划项目(201604020069,201607020043);广东省气象局科研项目(GRMC2017Q12)。
作者单位
廖菲?广州市气象台, 广东 广州 511430?
李文婷?中国科学院大学 经济与管理学院, 北京 100190?
张子然?广东省清远市气象局, 广东 清远 511515?
苏冉?广州市气象台, 广东 广州 511430?
齐彦斌?中国气象局/吉林省人民政府人工影响天气联合开放实验室, 吉林 长春 130062
吉林省人工影响天气办公室, 吉林 长春 130062?
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中文摘要:
??????为进一步认识南海地区热带气旋强度和路径快速变化的统计特征,利用中国气象局上海台风研究所整编的1949-2017年的热带气旋最佳路径数据集,统计分析了不同强度等级热带气旋发生强度和路径快速变化的特征。结果表明:(1)由强热带风暴快速加强为台风、以及由台风快速加强为强台风是热带气旋强度快速加强发生频率最多的事件;强度快速加强次数以1次居多,一般不会超过2次;但大部分途经南海的热带气旋出现快速加强时都在南海以外的地区,在南海出现快速加强的概率仅为9.8%。(2)不同强度的热带气旋,其强度的维持时间长短对其强度快速加强有重要影响,一般在该强度的前24 h是快速加强的最佳阶段,当其中心气压下降速度超过-12.0 hPa/(6 h)时容易出现台风级别或以上的强度快速加强,且热带气旋快速加强容易出现在海温偏高地区。(3)南海地区热带气旋路径的偏转主要出现在西行路径中,其中以5°~30°的偏转为最常见,占到全部热带气旋总数的48.65%,不过,按照定义的路径快速转向标准,路径快速转向的概率仅有15.13%。随着热带气旋强度的增强,南海地区发生路径快速转向的频次迅速减少,路径快速转向主要出现在近海岸地区和南海中北部偏东区域。这些结果进一步细化和丰富了对南海地区热带气旋强度和路径快速变化的认识。
英文摘要:
??????The statistical characteristics of rapid changes of different grade tropical cyclone intensity and path in the South China Sea are analyzed by the best track data set of tropical cyclones for 69 years from 1949 to 2017 compiled by Shanghai Typhoon Institute of China Meteorological Administrator. The results show that:(1) The change from a severe tropical storm to a typhoon, and from a typhoon to a severe typhoon, are the most frequent events of rapid intensity changes. Most tropical cyclones experience intensity change no more than twice. However, most of the rapid intensifying tropical cyclones occur mainly outside the South China Sea in the western Pacific, and the probability of rapid intensifying over the South China Sea is only 9.8%. (2) The duration of intensity maintenance has an important effect on rapid intensity changes for different grade tropical cyclones. It is the highest rapid change stage during the first 24 hours. Rapid intensity change to typhoon or above grade is easily to occur when the decreasing velocity of central pressure exceeds -12.0 hPa/(6 h). Moreover, the rapid intensifying of tropical cyclones is easily to occur in areas with high sea surface temperature. (3) The deflection of the tropical cyclone path in the South China Sea is mainly in the westbound path, in which the deflection of 5°-30° is the most common, accounting for 48.65% of the total number of tropical cyclones. However, According to the defined path mutation criterion, the probability of path sharp turning is only 15.13%. With the increase of tropical cyclone intensity, the frequency of path sharp turning in the South China Sea decreases rapidly, and the path sharp turning occurs mainly in the coastal area and the east-central region of the South China Sea. This work further refines and enriches the understanding of the intensity and path rapid changes of tropical cyclones in the South China Sea.
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