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Title: | Evaluating the accuracy of Jason-3 water vapor product using PWV data from global radiosonde and GNSS stations | Authors: | Gong, Y Liu, Z |
Issue Date: | May-2021 | Source: | IEEE transactions on geoscience and remote sensing, May 2021, v. 59, no. 5, p. 4008-4017 | Abstract: | Jason-3 is equipped with the Advanced Microwave Radiometer-2 (AMR-2) to account for the zenith wet delay (ZWD) caused by the troposphere in the altimeter signal, from which the precipitable water vapor (PWV) can be deduced. In order to investigate the accuracy of PWV from Jason-3 AMR-2 on a global scale, we adopted PWV observations from 263 radiosonde stations and 103 Global Navigation Satellite System (GNSS) stations as reference PWV. These reference PWVs are recorded during Jason-3 cycles 0-119 and are globally distributed in coastal and island regions. Over 60 000 Jason-3 PWV versus radiosonde PWV comparison points and over 380 000 Jason-3 PWV versus GNSS PWV comparison points are used in this study. For GNSS PWV, two PWV height reduction methods (Kouba empirical method and European Centre for Medium-Range Weather Forecasts (ECMWF) method) are used to reduce the PWV from height of station to sea level. The comparison results indicate that the root-mean-square error (RMSE) of Jason-3 PWV evaluated using radiosonde PWV is 3.4 kg/m2. Jason-3 PWV has an RMSE of 3.0 kg/m2 with GNSS PWV derived using ECMWF PWV height correction, while the RMSE between Jason-3 PWV and GNSS PWV derived using Kouba PWV height correction is 3.1 kg/m2. In addition, the accuracy of Jason-3 PWV increases when the latitude of its footprints or the distance from its footprints to land increases. | Keywords: | Advanced microwave radiometer-2 (AMR-2) Global navigation satellite systems (GNSS) Jason-3 Precipitable water vapor (PWV) Radiosonde |
Publisher: | Institute of Electrical and Electronics Engineers | Journal: | IEEE transactions on geoscience and remote sensing | ISSN: | 0196-2892 | EISSN: | 1558-0644 | DOI: | 10.1109/TGRS.2020.3017761 | Rights: | © 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. The following publication Gong, Y., & Liu, Z. (2020). Evaluating the accuracy of Jason-3 water vapor product using PWV data from global radiosonde and GNSS stations. IEEE Transactions on Geoscience and Remote Sensing, 59(5), 4008-4017 is available at https://doi.org/10.1109/TGRS.2020.3017761 |
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Gong_Evaluating_Accuracy_Jason-3.pdf | Pre-Published version | 2.71 MB | Adobe PDF | View/Open |
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