台风海面风场动力诊断模式的建立与模拟计算

本文总结和归纳了已有的台风海面风场模式，按照风场模式物理背景的不同进行了分类．在此基础上，本文选择并建立了一种新的台风海面风场动力诊断模式．首先，利用台风影响范围内某条具有代表性的闭合等压线的拟合方程表示出台风海面气压场，并利用改进的气压场模式和修正的梯度风方程求得台风系统风场，同时还利用宫崎正卫的热带气旋合成风假设建立移行台风风场．然后将两者作权重订正后进行迭加，即得到台风模型风场．该模式考虑了包括台风气压场的非对称性、边界层摩擦效用、气压梯度的切向变化及台风中心移动的影响等多种因素．经过对0519号“龙王”台风的模拟，结果表明本文所建立的台风风场模式可以比较准确的模拟出非圆对称的台风海面气压场和海面风场，较为真实地反映实际台风风场的特征．

Establishment and simulation for the diagnostic model of typhoon wind field on the sea surface

In this paper, according to the physical background, the existing models of sea surface wind field of typhoon are summarized and classified. On this basis, a new diagnostic model for typhoon wind field is established. First, the sea surface air pressure field of typhoon is expressed based on the fitted equation of a representative closed isobar of typhoon, and then the wind field of typhoon system is calculated with an improved air pressure model and modified gradient wind equation. While also it is using the tropical cyclone synthetic wind assumption of Miyazaki to establish a moving typhoon wind field. Then the model of typhoon wind field is composed according to the proportion of the both. The model takes a variety of factors into account including asymmetrical air pressure field of typhoon, the boundary layer friction action, the pressure gradient tangent diversification and the movement of typhoon. Through the simulation on No. 0519 ,the Longwang Typhoon ,it shows that this model could simulate a non-circular symmetrical sea surface air pressure field and wind field during the typhoon happens and more realistically reflect the real typhoon wind field compared with previous studies.