利用气象数据计算局部对流层湿延迟的方法

Method of calculating accurate tropospheric wet delay for local area by meteorological data

天顶对流层湿延迟是反演大气水汽含量的重要参数。该文通过研究局部地区垂直剖面气象条件的变化特征,提出了一种利用地表实时观测气象数据及历史资料计算当前时刻局部地区垂直剖面气象参数的方法,进而可利用积分方法精确求得该地区对流层湿延迟。通过与当前精度较高的经验模型对比,证明本文提出的方法能有效削弱局部地区对流层湿延迟误差,RMS和Bias误差可分别降低30%、50%左右;由于观测量仅是温度和湿度,故相较于利用GNSS等空间大地观测台站估计湿延迟的方法,本文方法的成本将小许多。

Zenith non-hydrostatic tropospheric delay was one of the major parameters in inversion of atmospheric water vapor content.By analyzing the various characteristics of local meteorological conditions in vertical profile,this paper proposed a method of calculating current parameters in vertical direction utilizing surface real-time observable meteorological measurements,which could be applied to obtaining non-hydrostatic tropospheric delay accurately by integral.Compared with one of the most accurate empirical models,the method given in this paper was proved to be able to decrease the non-hydrostatic delay uncertainty in research areas efficiently,with the RMS and Bias errors reduced approximately by 30%and 50%,respectively.Since the observables were temperature and humidity,the method proposed in this paper would perform at a much lower cost than those which employ space geodetic stations such as GNSS.