Evaluation and Adjustment of Precipitable Water Vapor Products from FY-4A Using Radiosonde and GNSS Data from China
The geostationary meteorological satellite Fengyun-4A (FY-4A) has rapidly advanced, generating abundant high spatiotemporal resolution atmospheric precipitable water vapor (PWV) products. However, remote sensing satellites are vulnerable to weather conditions, and these latest operational PWV produc...
Saved in:
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-01-01
|
| Series: | Atmosphere |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4433/16/1/99 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832589132510003200 |
|---|---|
| author | Xiangping Chen Yifei Yang Wen Liu Changzeng Tang Congcong Ling Liangke Huang Shaofeng Xie Lilong Liu |
| author_facet | Xiangping Chen Yifei Yang Wen Liu Changzeng Tang Congcong Ling Liangke Huang Shaofeng Xie Lilong Liu |
| author_sort | Xiangping Chen |
| collection | DOAJ |
| description | The geostationary meteorological satellite Fengyun-4A (FY-4A) has rapidly advanced, generating abundant high spatiotemporal resolution atmospheric precipitable water vapor (PWV) products. However, remote sensing satellites are vulnerable to weather conditions, and these latest operational PWV products still require systematic validation. This study presents a comprehensive evaluation of FY-4A PWV products by separately using PWV data retrieved from radiosondes (RS) and the Global Navigation Satellite System (GNSS) from 2019 to 2022 in China and the surrounding regions. The overall results indicate a significant consistency between FY-4A PWV and RS PWV as well as GNSS PWV, with mean biases of 7.21 mm and −8.85 mm, and root mean square errors (RMSEs) of 7.03 mm and 3.76 mm, respectively. In terms of spatial variability, the significant differences in mean bias and RMSE were 6.50 mm and 2.60 mm between FY-4A PWV and RS PWV in the northern and southern subregions, respectively, and 5.36 mm and 1.73 mm between FY-4A PWV and GNSS PWV in the northwestern and southern subregions, respectively. The RMSE of FY-4A PWV generally increases with decreasing latitude, and the bias is predominantly negative, indicating an underestimation of water vapor. Regarding temporal differences, both the monthly and daily biases and RMSEs of FY-4A PWV are significantly higher in summer than in winter, with daily precision metrics in summer displaying pronounced peaks and irregular fluctuations. The classic seasonal, regional adjustment model effectively reduced FY-4A PWV deviations across all regions, especially in the NWC subregion with low water vapor distribution. In summary, the accuracy metrics of FY-4A PWV show distinct spatiotemporal variations compared to RS PWV and GNSS PWV, and these variations should be considered to fully realize the potential of multi-source water vapor applications. |
| format | Article |
| id | doaj-art-96f4c66354fd4e60b2bbcc89aa317fc3 |
| institution | Kabale University |
| issn | 2073-4433 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Atmosphere |
| spelling | doaj-art-96f4c66354fd4e60b2bbcc89aa317fc32025-01-24T13:22:01ZengMDPI AGAtmosphere2073-44332025-01-011619910.3390/atmos16010099Evaluation and Adjustment of Precipitable Water Vapor Products from FY-4A Using Radiosonde and GNSS Data from ChinaXiangping Chen0Yifei Yang1Wen Liu2Changzeng Tang3Congcong Ling4Liangke Huang5Shaofeng Xie6Lilong Liu7Natural Resources Information Center of Guangxi Zhuang Autonomous Region, Nanning 530200, ChinaNatural Resources Information Center of Guangxi Zhuang Autonomous Region, Nanning 530200, ChinaCollege of Geomatics and Geoinformation, Guilin University of Technology, Guilin 541004, ChinaNatural Resources Information Center of Guangxi Zhuang Autonomous Region, Nanning 530200, ChinaNatural Resources Information Center of Guangxi Zhuang Autonomous Region, Nanning 530200, ChinaCollege of Geomatics and Geoinformation, Guilin University of Technology, Guilin 541004, ChinaCollege of Geomatics and Geoinformation, Guilin University of Technology, Guilin 541004, ChinaCollege of Geomatics and Geoinformation, Guilin University of Technology, Guilin 541004, ChinaThe geostationary meteorological satellite Fengyun-4A (FY-4A) has rapidly advanced, generating abundant high spatiotemporal resolution atmospheric precipitable water vapor (PWV) products. However, remote sensing satellites are vulnerable to weather conditions, and these latest operational PWV products still require systematic validation. This study presents a comprehensive evaluation of FY-4A PWV products by separately using PWV data retrieved from radiosondes (RS) and the Global Navigation Satellite System (GNSS) from 2019 to 2022 in China and the surrounding regions. The overall results indicate a significant consistency between FY-4A PWV and RS PWV as well as GNSS PWV, with mean biases of 7.21 mm and −8.85 mm, and root mean square errors (RMSEs) of 7.03 mm and 3.76 mm, respectively. In terms of spatial variability, the significant differences in mean bias and RMSE were 6.50 mm and 2.60 mm between FY-4A PWV and RS PWV in the northern and southern subregions, respectively, and 5.36 mm and 1.73 mm between FY-4A PWV and GNSS PWV in the northwestern and southern subregions, respectively. The RMSE of FY-4A PWV generally increases with decreasing latitude, and the bias is predominantly negative, indicating an underestimation of water vapor. Regarding temporal differences, both the monthly and daily biases and RMSEs of FY-4A PWV are significantly higher in summer than in winter, with daily precision metrics in summer displaying pronounced peaks and irregular fluctuations. The classic seasonal, regional adjustment model effectively reduced FY-4A PWV deviations across all regions, especially in the NWC subregion with low water vapor distribution. In summary, the accuracy metrics of FY-4A PWV show distinct spatiotemporal variations compared to RS PWV and GNSS PWV, and these variations should be considered to fully realize the potential of multi-source water vapor applications.https://www.mdpi.com/2073-4433/16/1/99GNSSradiosondeFY-4APWV |
| spellingShingle | Xiangping Chen Yifei Yang Wen Liu Changzeng Tang Congcong Ling Liangke Huang Shaofeng Xie Lilong Liu Evaluation and Adjustment of Precipitable Water Vapor Products from FY-4A Using Radiosonde and GNSS Data from China Atmosphere GNSS radiosonde FY-4A PWV |
| title | Evaluation and Adjustment of Precipitable Water Vapor Products from FY-4A Using Radiosonde and GNSS Data from China |
| title_full | Evaluation and Adjustment of Precipitable Water Vapor Products from FY-4A Using Radiosonde and GNSS Data from China |
| title_fullStr | Evaluation and Adjustment of Precipitable Water Vapor Products from FY-4A Using Radiosonde and GNSS Data from China |
| title_full_unstemmed | Evaluation and Adjustment of Precipitable Water Vapor Products from FY-4A Using Radiosonde and GNSS Data from China |
| title_short | Evaluation and Adjustment of Precipitable Water Vapor Products from FY-4A Using Radiosonde and GNSS Data from China |
| title_sort | evaluation and adjustment of precipitable water vapor products from fy 4a using radiosonde and gnss data from china |
| topic | GNSS radiosonde FY-4A PWV |
| url | https://www.mdpi.com/2073-4433/16/1/99 |
| work_keys_str_mv | AT xiangpingchen evaluationandadjustmentofprecipitablewatervaporproductsfromfy4ausingradiosondeandgnssdatafromchina AT yifeiyang evaluationandadjustmentofprecipitablewatervaporproductsfromfy4ausingradiosondeandgnssdatafromchina AT wenliu evaluationandadjustmentofprecipitablewatervaporproductsfromfy4ausingradiosondeandgnssdatafromchina AT changzengtang evaluationandadjustmentofprecipitablewatervaporproductsfromfy4ausingradiosondeandgnssdatafromchina AT congcongling evaluationandadjustmentofprecipitablewatervaporproductsfromfy4ausingradiosondeandgnssdatafromchina AT liangkehuang evaluationandadjustmentofprecipitablewatervaporproductsfromfy4ausingradiosondeandgnssdatafromchina AT shaofengxie evaluationandadjustmentofprecipitablewatervaporproductsfromfy4ausingradiosondeandgnssdatafromchina AT lilongliu evaluationandadjustmentofprecipitablewatervaporproductsfromfy4ausingradiosondeandgnssdatafromchina |