• 大地测量学与导航 •

### GPT2w模型在南极地区精度分析

1. 1. 武汉大学中国南极测绘研究中心, 湖北 武汉 430079;
2. 武汉大学测绘学院, 湖北 武汉 430079;
3. 武汉大学地球空间环境与大地测量教育部重点实验室, 湖北 武汉 430079
• 收稿日期:2017-08-30 修回日期:2018-05-05 出版日期:2018-10-20 发布日期:2018-10-24
• 通讯作者: 单路路 E-mail:llshan@whu.edu.cn
• 作者简介:孔建(1987-),男,博士,讲师,研究方向为GNSS对流层、电离层建模。E-mail:jkong@whu.edu.cn
• 基金资助:
国家重点研发计划（2016YFB0501803）；国家自然科学基金（41574028；41604002）；中央高校基本科研业务费专项资金（2042016kf0037）；武汉大学地球空间环境与大地测量教育部重点实验室测绘基础研究基金（16-02-04）

### The Accuracy Analysis of GPT2w at the Antarctic Area

KONG Jian1,3, YAO Yibin2,3, SHAN Lulu2, WANG Zemin1

1. 1. Chinese Antarctic Center of Surveying and Mapping, Wuhan University, Wuhan 430079, China;
2. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China;
3. Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430079, China
• Received:2017-08-30 Revised:2018-05-05 Online:2018-10-20 Published:2018-10-24
• Supported by:
The National Key Research and Development Program of China (No. 2016YFB0501803);The National Natural Science Foundation of China (Nos. 41574028;41604002);The Fundamental Research Funds for the Central Universities (No.2042016kf0037);The Research Fund of Key Laboratory of Geospace Environment and Geodesy (Wuhan University), Ministry of Education (No. 16-02-04)

Abstract: GPT2w (global pressure and temperature 2 wet) is one of the widely used empirical troposphere models, which is usually used to compute the tropospheric parameters, such as pressure, temperature, water vapor pressure etc. In order to analyze the model accuracy around the Antarctic Pole area, the actual data from the radiosonde stations and the measured data during the Chinese 33th Antarctica Expedition are used to test the model parameter's accuracy on different height level. Based on the comparison with the data from the radiosonde stations and GPT2w, it is found that on ground level, the model accuracy at Antarctic Pole area is high, which is consistent with the accuracy at other areas; then by comparing the statistics in January and July, it is found that Bias and RMS showed seasonal characteristics; at the same time, it is found that there is a large error in the vertical direction of the model, which shows that as the height increases, the accuracy decreases and gradually stabilizes.Before the comparison with the measured data and GPT2w, the ECMWF(European Centre for Medium-range Weather Forecasts)data are used to confirm the reliability of the measured data, while the results showed that the two dataset consistent with each other. Meanwhile, by comparison, it is found that the GPT2w accuracy among a day is equal to monthly average accuracy on ground level, but the vertical accuracy decreases with the increase of height compared with the accuracy of the warm season, which shows that there is a certain impact on the accuracy of the model without considering the variation of the daily period. zenith tropospheric delay (ZTD) calculated by sounding data is used to analyze the accuracy of GPT2w. The result shows that the accuracy of GPT2w ZTD in the Antarctic is centimeter accuracy, which is equivalent to the accuracy of other areas in the world.