一种初始方程中应用实测风进行风场初值化的方法

A New Approach for Wind Initialization Using the Observed Winds in Primitive Numerical Weather Prediction Equation

本文提出一种利用实测风场、高度场、温度场和地面三小时气压变化资料,考虑风场和质量场之间基本满足准地转平衡关系,大气具有准无辐散性,但又保留一部分与地面气压变化相应散度的地转偏差,将以实测的等压面风场插到σ坐标的风场进行订正的初值化方法,并用一个单时资料进行初步试验.文中还对风场初值化问题进行了讨论.

A new approach for wind initialization using the observed wind, geopotential height, temperature and surface pressure change fields is presented in this paper, in which not only the qua-si-geostrophic equilibrium between wind and pressure fields is essentially taken into account; but also certain geostrophic deviation associated with the surface pressure change is retained. It also takes into account the quasi-nondivergence of the atmosphere and revises the winds in crcoordinates interpolated from the observed winds in p-coordinates. A preliminary test was conducted with a set of real-time data for verifying this technique. Some aspects of wind initialization were also discussed .