1409号超强台风“威马逊”强度及路径异常的成因分析
李荔珊 高士欣 余丹丹
(61741部队)
摘 要 利用热带气旋警报报文资料、NCEP1°×1°格点资料以及avhrr卫星遥感海温资料,从高度场、涡度场、湿度场、风场和海温场出发,诊断分析超强台风“威马逊”近海强度急剧增强和移速多变的原因。结果表明,“威马逊”强度急剧增强与南亚高压东进及副高西伸直接有关,正涡度平流和涡量垂直输送是导致“威马逊”强度急剧增强的重要原因;“威马逊”强度急剧增强还与南海夏季风活动密切相关,充沛的水汽供应是“威马逊”强度急剧增强的直接原因,南海夏季风突然增强是“威马逊”强度急剧增强的根本原因。此外,暖洋面、弱纬向风垂直切变也是“威马逊”强度进一步维持和加强的必要条件。“威马逊”属于非均匀加速西行进入南海的热带气旋,副高脊非均匀加强西伸是导致“威马逊”非均匀加速西行的主要原因。
关键词:超强台风“威马逊”;西太平洋副热带高压;强度急剧增强;非均匀加速
The 1409 super typhoon "Wimason" strength and path analysis of the causes of abnormal
LI Lishan GAO Shinxin YU Dandan
(Unit 61741)
Use of tropical cyclone warning message data, NCEP 1°×1° grid point data and AVHRR satellite remote sensing SST data, starting from the height field, vorticity field, humidity field, wind field and SST, diagnostic analysis of super typhoon "Wimason" offshore enhancement and shift speed changing reasons. The results show that, "Wimason" enhancement is directly related to the East South Asia high and the subtropical high, the positive vorticity advection and vertical transport stream and vorticity is "an important reason leading to enhancement of Wimason"; "Wimason" enhancement is also closely related to the South China Sea summer monsoon activity, abundant water vapor supply is "direct the reason Wimason" enhancement of South China Sea summer monsoon abrupt enhancement, is the essential reason for the "Wimason" enhancement of. In addition, a necessary condition for the warm ocean, weak vertical shear of zonal wind is the "Wimason" strength to further maintain and strengthen the. "Ramasun" belongs to non uniformly accelerated westward into the South China Sea Tropical Cyclone, subtropical high ridge non-uniform strengthening and extending westward is the cause of "the main reason Wimason" non uniformly accelerated westward.
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