南京大学学报(自然科学版) ›› 2014, Vol. 50 ›› Issue (6): 855864.
黄旋旋1,2,朱科锋1*,赵坤
Huang Xuanxuan1,2 ,Zhu Kefeng1 ,Zhao Kun1
摘要: 本研究提出了近海台风自适应定位方法(Typhoon eye adaptive identifying and tracking, TEAIT)。该方法主要基于多普勒反射率数据对近海台风的台风眼进行客观的识别和追踪。文中对4个典型台风个例使用TEAIT方法进行了定位测试,并将其与基于径向风的GBVTD-simplex和基于弱回波的TCET方法作比较。相比GBVTD-simplex方法,因为雷达回波的观测半径要大于径向风,TEAIT方法可以更早的追踪台风。对相同时段定位比较表明,两者中心定位差绝大部分都分布在5km内。进一步分析表明,差异大主要是在台风路径显著转向或者台风眼剧烈收缩时,此时台风环流中心和回波中心不重合导致。相比同样基于回波的TCET方法,TEAIT方法即便在台风结构不对称、眼不闭合、低层填塞等情况下都能成功定位,而TECT法在这些情形下容易定位失败。TEAIT方法比TECT方法表现出更好地识别和连续追踪能力。
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