A Dynamical Initialization Scheme for Tropical Cyclones under the Influence of Terrain

A Dynamical Initialization Scheme for Tropical Cyclones under the Influence of Terrain
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地形影响下热带气旋的动态初始化方案

DOI:
10.1175/waf-d-17-0139.1
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发表时间:
2018-04
影响因子:
2.9
通讯作者:
Duan Yihong
Duan Yihong
中科院分区:
地球科学3区
文献类型:
--
作者:
Liu Hao-Yan;Wang Yuqing;Xu Jing;Duan Yihong

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摘要本研究将热带气旋动力学初始化(DI)方案推广到受地形影响的情况。当距离TC中心150 ~ 450 km之间存在小于1 km的地形时,定义地形变量,并在进行涡分离之前使用滤波算法去除地形存在带来的噪声。当距离TC中心150 ~ 300 km范围内存在高于1 km的地形,或TC中心在距离陆地150 km范围内时,在将地形包括在内并将TC涡与大尺度分析场合并之前,进行不含地形的半理想积分,旋转出一个轴对称的TC涡。此外,为了减少预报运行前的初始误差,还引入了涡旋大小/强度调整程序。本文对北太平洋西部受地形影响的9个tc进行了两组预测,一组不采用CTRL模式,另一组采用新的DI模式。
AbstractThis study extends an earlier dynamical initialization (DI) scheme for tropical cyclones (TCs) to situations under the influence of terrain. When any terrain lower than 1 km exists between 150 and 450 km from the TC center, topographic variables are defined and a filtering algorithm is used to remove noise due to the presence of terrain before the vortex separation is conducted. When any terrain higher than 1 km exists between 150 and 300 km from the TC center, or the TC center is within 150 km of land, a semi-idealized integration without the terrain is conducted to spin up an axisymmetric TC vortex before the inclusion of the terrain and the merging of the TC vortex with the large-scale analysis field. In addition, a procedure for the vortex size/intensity adjustment is introduced to reduce the initial errors before the forecast run. Two sets of hindcasts, one without (CTRL run) and one with the new DI scheme (DI run), are conducted for nine TCs affected by terrain over the western North Pacific...
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