| 融合大气数值模式的高精度对流层天顶延迟计算方法 |
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| 引用本文： | 毛健,崔铁军,李晓丽,陈莉,孙艳玲,高爽,张辉.融合大气数值模式的高精度对流层天顶延迟计算方法[J].测绘学报,2019,48(7):862-870. |
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| 作者姓名： | 毛健 崔铁军 李晓丽 陈莉 孙艳玲 高爽 张辉 |
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| 作者单位： | 天津师范大学地理与环境科学学院,天津 300387;天津市地理空间信息技术工程中心,天津 300387;天津师范大学地理与环境科学学院,天津,300387 |
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| 基金项目： | 国家重点研发计划（2016YFC0201700）；天津师范大学博士基金（52XB1503） |
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| 摘 要： | 针对现有对流层天顶延迟模型改正法因水汽参数难以精确获取所导致的时空分辨率与精度上的不足问题,提出了一种融合WRF(weather research and forecasting model)大气数值模式的对流层天顶延迟估计方法。通过分析WRF模式的数值模拟机理及其数据结构特征,采用直接积分与模型改正相结合的混合计算方式,实现了全球任意位置上小时级的对流层天顶延迟估计。验证结果表明,该方法计算的小时级ZTD再分析值精度为13.6mm,日均值精度更是可达9.3mm,比传统模型UNB3m的49.6mm以及目前标称精度最高模型GPT2w的34.6mm,精度分别提高了约5倍和3.5倍。在30h的预报时段内,预报值精度也可达22mm。无论是ZTD再分析值还是预报值比现有模型的估计值精度均有明显提高。
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| 关 键 词： | 对流层天顶延迟 大气数值模式 高时空分辨率 高精度 |
| 收稿时间： | 2019-01-01 |
| 修稿时间： | 2019-05-13 |
A hight-accuracy method for tropospheric zenith delay error correction by fusing atmospheric numerical models |
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| MAO Jian,CUI Tiejun,LI Xiaoli,CHEN Li,SUN Yanling,GAO Shuang,ZHANG Hui.A hight-accuracy method for tropospheric zenith delay error correction by fusing atmospheric numerical models[J].Acta Geodaetica et Cartographica Sinica,2019,48(7):862-870. |
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| Authors: | MAO Jian CUI Tiejun LI Xiaoli CHEN Li SUN Yanling GAO Shuang ZHANG Hui |
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| Institution: | 1. School of Geographic and Environmental Sciences, Tianjin Normal University, Tianjin 300387, China;2. Tianjin Engineering Center for Geospatial Information Technology, Tianjin 300387, China |
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| Abstract: | The complexity and intensity of water vapor variations are the fundamental reasons why it is difficult for tropospheric zenith delay models to get accurate estimation. To solve this problem, a new method for estimating tropospheric zenith delay based on WRF(weather research and forecasting model) atmospheric numerical model is proposed. By analyzing the numerical simulation mechanism and data structure characteristics of WRF model, a hybrid method of direct integration and correction model is used to estimate the hourly tropospheric zenith delay at any position in the world. The validation results show that the accuracy of the hourly ZTD reanalysis value calculated by this method is 13.6 mm, and the daily average value is 9.3 mm, which is about 5 times and 3.5 times higher than that of the traditional model UNB3m and the current model GPT2w, respectively. In the 30-hour forecast period, the accuracy of the forecast value can also reach 22 mm. The accuracy is higher than existing tropospheric zenith delay models whether for the ZTD reanalysis value or the forecast value. |
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| Keywords: | tropospheric zenith delay atmospheric numerical model high spatiotemporal resolution high-precision |
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