利用掩星温度数据推算大气月平均纬向风场

Research of Monthly Zonal Winds Derived from Radio Occultation Temperature Data

为了弥补中高层大气风场探测数据的不足,对2007年COSMIC全球掩星在20~60km高度内的温度数据进行网格化插值,利用梯度风计算方法,计算得到20~60km高度内的月平均纬向风场,分别与ECMWF再分析数据和HWM07模式进行对比分析.结果表明,利用COSMIC温度数据计算得出的纬向风与ECMWF的纬向风十分接近,而与HWM07结果有一定差异,但总体变化趋势一致.与ECMWF再分析数据相比,利用COSMIC温度数据计算的月平均纬向风场平均偏差为-1.50^-0.08m·s^-1,标准差为1.50~11.95m·s^-1.与HWM07模式风场相比,利用COSMIC温度计算的月平均纬向风场平均偏差为-0.83~1.21m·s^-1,标准差为3.69~11.14m·s^-1.

In order to make up for the lack of wind data in the middle and upper atmosphere,the gradient wind fields between altitude of 20km to 60km are calculated by interpolating COSMIC temperature data of year 2007 into gridded data.The derived wind fields are compared with ECMWF reanalyzed data and HWM07 model outputs.Results show that the characteristics of wind fields derived from COSMIC temperature data are more similar with that of the reanalyzed data and are similar with HWM07 output as a whole,while are different from HWM07 data in detail.Compared with the ECMWF reanalyzed data,the mean differences of the zonal wind fields are within-1.50^-0.08m·s^-1,and the RMS are within 1.50~11.95m·s^-1.Compared with HWM07 outputs,the mean differences of the zonal wind fields are within-0.83~1.21m·s^-1,and the RMS are within 3.69~11.14m·s^-1.