基于CRA40产品的对流层延迟计算及对比分析

doi:10.11947/j.AGCS.2023.20210370

测绘学报 ›› 2023, Vol. 52 ›› Issue (1): 22-31.doi: 10.11947/j.AGCS.2023.20210370

基于CRA40产品的对流层延迟计算及对比分析

周要宗¹, 楼益栋¹, 张卫星¹, 梁宏², 施闯³, 吴迪⁴, 曹云昌²

1. 武汉大学卫星导航定位技术研究中心, 湖北武汉 430079;
2. 中国气象局气象探测中心, 北京 100081;
3. 北京航空航天大学卫星导航与移动通信融合技术工业和信息化部重点实验室, 北京 100191;
4. 南宁师范大学地理与海洋研究院, 广西南宁 530001

收稿日期:2021-07-08 修回日期:2022-04-25 发布日期:2023-02-09
通讯作者: 张卫星 E-mail:zhangweixing89@whu.edu.cn
作者简介:周要宗(1992—),男,博士生,研究方向为GNSS数据处理及气象应用。E-mail: zhouyaozong@whu.edu.cn
基金资助:
国家自然科学基金(42174027;41774036;41961144015);中央高校基本科研业务费专项资金资助(2042020kf0020);福建省自然科学基金(2020J01356)

On the calculation and comparative analysis of tropospheric delay from CRA40 product

ZHOU Yaozong¹, LOU Yidong¹, ZHANG Weixing¹, LIANG Hong², SHI Chuang³, WU Di⁴, CAO Yunchang²

1. GNSS Research Center, Wuhan University, Wuhan 430079, China;
2. Meteorological Observation Centre of CMA, Beijing 100081, China;
3. Laboratory of Navigation and Communication Fusion Technology, Ministry of Industry and Information Technology, Beihang University, Beijing 100191, China;
4. Institute of Geography and Oceanography, Nanning Normal University, Nanning 530001, China

Received:2021-07-08 Revised:2022-04-25 Published:2023-02-09
Supported by:
The National Natural Science Foundation of China (Nos. 42174027;41774036;41961144015);The Fundamental Research Funds for the Central Universities (No.2042020kf0020);The Natural Science Foundation of Fujian Province (No.2020J01356)

摘要/Abstract

摘要： 2020年12月中国首款全球大气再分析CRA40正式上线。本文瞄准CRA40在对流层延迟计算中的应用,首先探讨了利用CRA40采用射线追踪技术进行对流层延迟计算的方法,然后分别在全球范围231个IGS测站和中国区域213个陆态网测站处对2018年全年基于CRA40及ECMWF两款再分析资料(ERA-Interim和ERA5)获取的对流层天顶延迟和5°高度角斜路径延迟的精度进行了比较评估,并对中国区域CRA40天顶湿延迟(ZWD)和斜路径湿延迟(SWD)的精度变化规律进行了分析。结果表明:以GNSS天顶总延迟(ZTD)为参考的CRA40 ZTD偏差RMS在全球范围为1.39 cm,略优于ERA-Interim,在中国区域为1.41 cm,基本与ERA-Interim相当;以ERA5斜路径总延迟(STD)为参考的CRA40 STD偏差RMS在全球范围和中国区域分别为10.83和12.30 cm,同ERAI无明显差异;中国区域CRA40 ZWD和SWD精度与气候类型相关,季风气候区冬季ZWD和SWD精度明显优于夏季。

关键词: CRA40, ERA5, ERA-Interim, 射线追踪, 对流层延迟

Abstract: As the release of China's first generation 40 a (1979—2018) global atmosphere and land reanalysis (CRA40) by China meteorological administration (CMA) in December 2020, the suitability, method and performance of CRA40 in tropospheric delay ray-tracing is initially investigated in this paper. Tropospheric delays in zenith and 5° elevation directions at 231 international GNSS service (IGS) and 213 crustal movement observation network of China (CMONOC) stations during the year of 2018 from CRA40 and two ECMWF reanalysis (ERA-Interim and ERA5) are ray-traced and evaluated by GNSS zenith total delay (ZTD) products and inter-comparison in globe and China area, respectively. The change law from the CRA40 zenith wet delay (ZWD) and slant wet delay (SWD) accuracy is also analyzed over China. The results show that the CRA40 ZTD difference RMS is about 1.40 cm, and it is slightly better than ERA-Interim in globe and similar to ERA-Interim in China area. By taking the ERA5 slant total delay (STD) as a reference, the CRA40 STD difference RMS is about 10.83 and 12.30 cm in globe and China area, respectively, which is not significantly different from ERA-Interim. The CRA40 ZWD and SWD accuracy over China is related to the climatic types, and the accuracy during winter is obviously better than that during summer in monsoon climate areas.

Key words: CRA40, ERA5, ERA-Interim, ray-tracing, tropospheric delay

中图分类号:

P228

周要宗, 楼益栋, 张卫星, 梁宏, 施闯, 吴迪, 曹云昌. 基于CRA40产品的对流层延迟计算及对比分析[J]. 测绘学报, 2023, 52(1): 22-31.

ZHOU Yaozong, LOU Yidong, ZHANG Weixing, LIANG Hong, SHI Chuang, WU Di, CAO Yunchang. On the calculation and comparative analysis of tropospheric delay from CRA40 product[J]. Acta Geodaetica et Cartographica Sinica, 2023, 52(1): 22-31.

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基于CRA40产品的对流层延迟计算及对比分析

On the calculation and comparative analysis of tropospheric delay from CRA40 product

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