摘要
为有效利用舟山沿海各站点的风速资料,去除因高度差异而产生的风速偏大问题,使各站点风速资料更具代表性、可比较性和可应用性,将各站点风速资料统一订正到同一高度,运用风速廓线的指数律模式,结合最小二乘法原理,对舟山各气象站的多年风速资料进行研究。发现风速随高度的变化与气象站下垫面、风速大小和大气层结的状态密切相关,不同的下垫面对应不同的切变系数;随着风速增大,地面的摩擦作用变小,改变风速的能力越弱,切变系数越小;一天当中由于大气层结状态不同,切变系数存在日变化,中午最大,凌晨最小。
In order to effectively utilize the wind speed data of the coastal stations in Zhoushan, remove the error of wind speed caused by height difference, and make the wind speed data of each site more representative, comparable, and applicable, we unified the wind speed data of each site to the same height. To analyze years of wind data at each weather station in Zhoushan, we used exponential model to describe wind profile and least squares method for data fitting. The results showed that underlying surface, wind speed and atmospheric stratification status were closely related to wind changes in different heights. Different underlying surface had different shear coefficient. The larger the wind speed was, the smaller the surface friction would be; the weaker the ability to change the wind speed, the smaller the shear coefficient. Due to the stratification changed in a day, shear coefficient changes existed, the maximum appeared at noon and the minimum appeared in the early morning.
作者
於敏佳
刘菡
Yu Minjia;Liu Han(Zhoushan Meteorological Bureau, Zhoushan Zhejiang 316000)
出处
《气象研究与应用》
2018年第1期81-84,共4页
Journal of Meteorological Research and Application
基金
舟山市气象服务中心资助(2017C31097)
关键词
指数律模式
最小二乘法
下垫面
风速大小
大气层结
exponential model
least square method
underlying surface
wind speed
atmosphericstratification
