于玲玲,麦健华,程正泉. 2022. 热带气旋大风风圈半径非对称性特征及成因简析[J]. 气象学报, (6):-, doi:[doi]
热带气旋大风风圈半径非对称性特征及成因简析
Analysis on the asymmetric characteristics and causes of the wind circle radius of tropical cyclones
投稿时间:2021-11-08  修订日期:2022-06-22
DOI:
中文关键词:  热带气旋,风圈半径,非对称性,天气系统,位势高度梯度
英文关键词:Tropical cyclone, Wind circle radius, Asymmetry, Weather system, Potential height gradient
基金项目:
作者单位邮编
于玲玲 广东省气象台 510000
麦健华 中山市气象局 528400
程正泉 广东省气象台 510000
摘要点击次数: 16
全文下载次数: 8
中文摘要:
      [目的]为进一步完善热带气旋(TC)大风风圈的分析和预报业务,[资料和方法]利用中央气象台(NMC)发布的TC报文资料、ERA5再分析资料,研究了2015年6月30日至2020年12月31日时段内的TC最大强度时的7级、10级和12级风圈的非对称性特征及成因。统计结果表明:[结果]TC的7级风圈半径非对称性最大,10级次之,12级最小;非对称分布TC的7级、10级和12级风圈最大半径大多分布在NE、SE和NW象限;同一TC的7级和10级风圈最大半径大多分布在相同的象限。将7级风圈单一象限分布TC与多象限分布TC各按象限分布分成四类,分析四类7级风圈单一象限分布TC的生成季节、地面10m风特征及风圈非对称分布的成因发现:[结论]各类TC具有明显的季节性特征;地面10m风场呈不对称分布;风圈非对称分布与西太副高、西南气流及地面冷高压等天气系统与TC之间相互作用造成的各象限位势高度梯度非对称分布密切相关。
英文摘要:
      To improve the analysis and forecast of Ttropical Cyclone(TC) wind circle, using the TC data released by National Meteorological Center (NMC) and ERA5 reanalysis data, the asymmetric characteristics and the main causes of 30kt、50kt and 65kt wind circle maximum radius of TC reaching maximum intensity from June 30th, 2015 to December 31st, 2020 were studied. Statistical results showed the 30kt wind circle radius of TC were the most asymmetric, followed by 50kt and 64kt wind circle radius. The 30kt, 50kt and 64kt wind circle maximum radius of TC with asymmetric distribution mostly located in NE, SE and NW quadrants. The 30kt and 50kt wind circle maximum radius of the same TC roughly located in the same quadrant. Single quadrant distribution TC and multi quadrant distribution TC of 30kt wind circle were divided into four types according to quadrant distribution. By analyzing the generation season, surface wind and the causes of asymmetric distribution of TC with single quadrant distribution of 30kt wind circle, it was found that the generation of those four types of TC had obvious seasonal characteristics. The surface wind in different quadrant of TC showed asymmetric characteristic. The asymmetric distribution of wind circle was closely related to the asymmetry of potential height gradient in different quadrants caused by the interactions between TC and other weather systems, including the Western Pacific Subtropical High, the southwest air flow and the surface cold high pressure, etc.
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