doi:  10.3878/j.issn.1006-9895.1712.17227
海南岛附近区域热带气旋低层风场的变化特征

Characteristics of low-level tropical cyclone-induced wind fields around the Hainan Island
摘要点击 1158  全文点击 110  投稿时间:2017-09-03  修订日期:2017-11-20
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基金:  国家重点基础研究规划项目2015CB452804,国家自然科学基金41475055,51778617,41775048,科技基础性工作专项2013FY112400
中文关键词:  热带气旋 低层风场 风圈半径 海南岛
英文关键词:  Tropical cyclone, Low-level wind field, Radius of specific wind circle, Hainan Island
           
作者中文名作者英文名单位
薛霖XueLin灾害天气国家重点实验室
李英LI YING灾害天气国家重点实验室
王丙兰中国气象局公共气象服务中心
周荣卫中国气象局公共气象服务中心
引用:薛霖,李英,王丙兰,周荣卫.2018.海南岛附近区域热带气旋低层风场的变化特征[J].大气科学
Citation:XueLin,LI YING.2018.Characteristics of low-level tropical cyclone-induced wind fields around the Hainan Island[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      利用1979-2015年JTWC最佳路径资料(2001-2015年资料用于台风风圈结构分析)及ERA-interim(0.5° × 0.5°)再分析数据,统计分析我国海南岛附近区域(106°E-116°E,15.5°N-23.5°N)TC低层风场的变化特征。结果表明:1)年均5.5个TC于4-12月主要以西偏北路径进入该区域,其中海南岛东南侧海域TC出现频率最高且强TC比例最多,而岛西北区域出现频率最低,强TC比例最少。2)TC中心位于海南岛不同方位时,其外围低层风场分布具有不同的非对称特征,且大风出现比率也各有差异。TC中心位于海南岛上时出现大风比率最高,位于岛南侧时次之,位于岛北侧时最小。3)该区域TC平均最大风速半径(RMW)为58.3km。TC位于岛上时RMW最大,而位于岛西南侧最小。4)TC近中心最大风速由海上向陆地急剧减小,其高值中心主要位于雷州半岛东侧及西侧海域。5)研究区域内TC的34节风圈半径在TC环流的东侧大而西侧小,强TC大而弱TC小。6)不同区域TC变形程度有所差异。平均而言,位于岛西南侧TC变形最大而位于岛东南侧时变形最小。
Abstract:
      By use of the best track dataset from the JTWC and the ERA-Interim reanalysis data (0.5° × 0.5°) from 1979 to 2015, characteristics of tropical cyclone (TC) low-level wind field around the Hainan Island are statistically analyzed (106°E-116°E,15.5°N-23.5°N). Results indicate that: 1) Averaged 5.5 TCs cross the study region during April to December in a year. Most of TC samples are located on the southeastern side of the Hainan Island and their intensities are stronger than the ones on the northwestern side of the island. 2) When TC centers locate on different directions of the Island, the low-level outer wind fields are in different asymmetric distributions and high wind occurrence rates. When TCs are on the Hainan Island (on the north of the island), the strong wind occurrence rate is the highest (lowest). 3) Radiuses of the maximum wind (RMW) for TCs around the Hainan Island are within 9 -185 km and the averaged value is 58.3 km. On the average, RMWs of TCs on the island (on the southwest of the island) are the biggest (smallest). 4) The maximum wind speeds near the TC center are sharp decreased from the sea to the land. And high wind regions are located at the sea areas on western and eastern sides of the Leizhou Peninsula. 5) The 34 kts wind radiuses on the east side of TC circulation are large than the western ones. And the stronger the TC is, the larger and more symmetry its specific wind radius will be. 6) Different regions have different degrees of wind circle deformation. On average, when TC is located on the southwestern (southeastern) side of the island, its wind circle has the largest (least) deformation.
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