摘要
利用高阶多项式拟合实际雷达速度观测的方法生成模拟资料,据此比较了3种雷达资料格点化的插值方案,它们是先锥面后垂直内插方案(CVI),3维Barnes插值方案(3D-Barnes)和变分分析方案(VAR)。结果表明,3D-Barnes方案明显优于其它两种,特别是在中层;CVI方案的误差略高于前者,但是光滑性较差,在高层和低层空缺区较大;VAR方案的误差最大。
The simulanted radar data are produced by using high-order Lengendre polynomials to fit the real radar observed wind.Three interpolation schemes are tested with the simulated data.In first scheme(CVI),the radar data are first interpolated to horizontal Cartesian grids but left on their original constant elevation surfaces in the vertical,then the data are further interpolated to the Cartesian grids with a linear interpolation in the vertical.The second scheme is the three-dimension Barnes interpolation technique(3D-Barnes).The third scheme is three-dimension variational analysis (VAR).The results show that the 3D-Barnes scheme obviously excels the others, especially at middle level;the error of the CVI scheme is slightly larger than the former,and its smoothness is poor,and it has biggish missing region at lower and upper level.The VAR scheme is not perfect.
出处
《干旱气象》
2004年第2期6-10,共5页
Journal of Arid Meteorology
基金
国家自然科学基金(40175010)
甘肃人影(2002-1-04)项目资助
关键词
多普勒雷达
格点化
插值
Doppler radar
gridding
interpolation.
