利用掩星温度数据推算大气月平均纬向风场

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·^-1,标准差为1.50～11.95m·^-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·^-1,标准差为3.69～11.14m·^-1.     

Tropospheric delays from GNSS for application in coastal altimetry

In the scope of the development of an improved methodology for the computation of the wet tropospheric correction for coastal altimetry, based on the use of tropospheric delays derived from GNSS (Global Navigation Satellite Systems), various studies have been conducted aiming to improve the estimation, at global scale, of GNSS-derived tropospheric delays.