利用稳健协方差转换法构建对流层顶经验模型

对流层顶与纬度具有极强的相关性,同时随季节呈周期性变化。文中利用2008年至2010年的COSMIC掩星数据采用稳健协方差估计求得每天全球范围内掩星事件处的对流层顶高度,以时间和纬度为自变量,建立对流层顶的全球经验模型。利用全球分布的28个探空站观测数据,基于与对流层顶相关的Hopfield湿延迟模型,讨论了对流层顶对湿延迟的影响。结果表明,建立的对流层顶经验模型有助于提高湿延迟的计算精度,约0～15 mm. 

The Construction of the Empirical Model of the Tropopause Height with the Method of Robust Covariance Estimation

The tropopause has a strong correlation with latitude, and have the periodic changes with the seasons at the same time. The COSMIC radio occultation data from 2008 to 2010 are used to obtain tropopause height at worldwide occultation events by the method of robust covariance estimation. With time and latitude as independent variables, eventually established a tropopause global experience model. The influence of tropopause on wet delay is discussed based on the data of 28 sounding stations distributed globally and based on the Hopfield wet delay model related to tropopause. The results show that the established empirical model of tropospheric top is helpful to improve the calculation precision of wet delay, about 0～15 mm.