HY-2A散射计数据在台风“苏力”海表面风场结构研究中的应用  

Application of HY-2A/SCAT Records to Understanding the Surface Wind Field Structure of Typhoon Soulik

作　　者：赵勇[1] 赵朝方[1] 孙如瑶 

机构地区：[1]中国海洋大学海洋遥感研究所,山东青岛266100

出　　处：《海洋湖沼通报》2017年第2期39-47,共9页Transactions of Oceanology and Limnology

基　　金：国家基金委-山东省联合基金项目(U1406404);国家高技术研究发展计划(2013AA09A505)资助

摘　　要：以西北太平洋2013年第7号超强台风"苏力"为例,基于台风风场分解原理并采用改进的Tikhonov正则化原理进行数值微分,结合台风散度场和涡度场的分布规律,应用HY-2A/SCAT散射计海表面风场数据对台风"苏力"进行了中心定位、路径追踪、台风背景风场提取和台风径向、切向风提取和分析。结果表明,结合散度场和涡度场进行台风中心定位的方法所得到的台风中心与联合台风警报中心JTWC最优路数据相比较,误差合理。文中所提取得到的实际(相对)径向风场和切向风场的分布特征验证了早期飞机侦测所得到部分结论。归一化切向风廓线呈瑞金涡流分布,归一化径向风廓线呈倒置的高斯分布模型。HY-2A Scatterometer sea surface wind records were applied to observing and studying the surface wind field structure of typhoon Soulik （No. 102013） in northwestern Pacific Ocean in this study. Typhoon＇s center positions, track and surface background winds were estimated using the wind field decomposition theorem with the improved numerical differentiation technique based on Tikhonov regularization theory. Center positions estimated here show a high degree of consistency with typhoon＇s vortex structure. Distribution of TC＇s actual （relative） tangential and radial surface winds referring to the TC center were then extracted and fitted. Most of the conclusions of the surface wind distribution confirmed past low level aircraft reconnaissance, yet some （radial winds） showed discrepancy and needed to be investigated further. The fitted model of the normalized tangential winds profile behaved like a Rankine vortex and the normalized radial winds behaved like an inverted Gaussian model, which still needed to be improved through future studies.

关 键 词：HY-2A/SCAT 台风 中心定位 风场结构 

分 类 号：V443[航空宇航科学与技术—飞行器设计]