仲跻芹,Yong-Run GUO,张京江. 2017. 华北地区地基GPS天顶总延迟观测的质量控制和同化应用研究[J]. 气象学报, 75(1):147-164, doi:10.11676/qxxb2017.010
华北地区地基GPS天顶总延迟观测的质量控制和同化应用研究
A study of quality control and assimilation of ground-based GPS ZTD in North China
投稿时间:2016-03-11  最后修改时间:2016-10-28
DOI:10.11676/qxxb2017.010
中文关键词:  GPS天顶总延迟  质量控制  变分同化  数值预报
英文关键词:GPS Zenith Total Delay  Quality control  Variational assimilation  Numerical prediction
基金项目:公益性行业(气象)科研专项(GYHY201406012)。
作者单位
仲跻芹 中国气象局北京城市气象研究所, 北京, 100089 
Yong-Run GUO 美国国家大气研究中心, 博尔德, 科罗拉多, 80307 
张京江 中国气象局北京城市气象研究所, 北京, 100089 
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中文摘要:
      地基GPS天顶总延迟由于其解算误差来源少于目前广泛应用的可降水量资料,其同化应用将会为数值预报初值场更好地提供大气信息。面向同化应用的天顶总延迟观测质量控制方案的研发将会有效推进该资料在中国数值预报中的广泛应用。基于2013-2014年华北地区天顶总延迟观测资料,发展了一套针对数值预报同化应用的天顶总延迟观测质量控制方案。该方案从测站稳定性和解算精度、离群值、系统偏差及标准差等考察点切入,从不同角度检查和标记出致使观测序列统计特性偏离高斯分布特征的样本。质量控制后序列统计特征量更接近三维变分系统对观测资料的性质假设,表明了所建立质量控制方案的合理性。基于北京市气象局数值预报业务系统BJ-RUC开展了连续11 d的快速更新循环预报试验。评估结果表明:同化质控后天顶总延迟试验的降水预报效果明显优于同化未质控天顶总延迟试验,表明所建立质量控制方案的有效性。同化质控后天顶总延迟试验的降水预报效果优于未同化GPS资料试验,表明天顶总延迟资料的同化应用可以有效提升预报系统的降水预报效果,特别是在无探空资料参加同化的预报时次;同化质控后天顶总延迟资料试验的降水预报效果也优于同化可降水量的试验,表明使用天顶总延迟资料代替可降水量资料在数值预报业务中开展同化应用是可行的。在天顶总延迟观测质量控制方案研发和同化应用得到了一些有意义的结果,有助于推进该观测资料在数值预报科研和业务中的应用,为提升预报性能提供技术支撑。
英文摘要:
      Based on an observational data serial of ground-based GPS Zenith Total Delay (ZTD) in North China for 2013 and 2014, a quality control scheme for the ZTD observation is developed. The quality control scheme can check and mark out those data that make the statistic characteristic of the data serial to deviate from Gaussion distribution by taking account of the observation site stability, accuracy, outliers, systematic bias and standard deviation. The statistic characteristics of the data serial after quality control can better meet the hypothesis of variational assimilation system, which confirms the validity of the quality control scheme. Analysis of verification scores of continuous simulation experiments shows that the results of experiments with assimilation of quality controlled ZTD are better than those of experiments with assimilation of uncontrolled ZTD and precipitable water (PW). According to the above analysis, it is clear that the assimilation of ZTD can efficiently improve the precipitation forecast skill. It is feasible to replace PW by ZTD in operational numerical weather forecast. In summary, this study on quality control and assimilation of ZTD reveals some meaningful results, which would support and further improve the application of ZTD in numerical weather forecast.
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