GPS弯曲角资料在WRF模式中的同化试验——对台风“森拉克”的影响分析

被引:5
作者
毕研盟 [1 ]
袁炳 [2 ]
王云峰 [2 ]
马刚 [1 ]
张鹏 [1 ]
机构
[1] 国家卫星气象中心
[2] 解放军理工大学气象学院
关键词
数值天气预报; 资料同化; COSMIC; 弯曲角;
D O I
暂无
中图分类号
P457.8 [热带气旋、台风、飓风预报];
学科分类号
0706 ; 070601 ;
摘要
实现了在WRF模式中GPS掩星弯曲角资料的三维变分同化,正演算子采用大气一维球对称假设条件下,Abel变换方法计算弯曲角。以2008年13号台风"森拉克"为例,研究了COSMIC弯曲角资料对台风预报路径、强度及降水等的影响。与控制试验及台风实况的对比结果表明,同化COSMIC弯曲角资料后,在24小时预报以后,对台风路径预报有较明显的改进效果,路径预报误差平均降低约67.5%;但台风强度预报整体偏弱。分析认为,同化弯曲角资料后,台风附近形势场的改进是提高路径预报的原因。由于弯曲角资料本身存在水平分辨率较低的问题,以及对流层底部信号质量不如中上部和平流层是台风强度预报偏弱的重要原因。
引用
收藏
页码:149 / 154
页数:6
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