Comprehensive Validation and Calibration of MODIS PWV over Mainland China
Although ground-based precipitable water vapor (PWV) can be obtained with a high temporal resolution and spatial resolution of tens of kilometers in an urban area using Global Navigation Satellite System (GNSS) observation, it remains fairly sparse in the vast regions over Mainland China. Satellite-...
Published in: | Atmosphere |
---|---|
Main Authors: | , , , |
Format: | Text |
Language: | English |
Published: |
Multidisciplinary Digital Publishing Institute
2022
|
Subjects: | |
Online Access: | https://doi.org/10.3390/atmos13111763 |
id |
ftmdpi:oai:mdpi.com:/2073-4433/13/11/1763/ |
---|---|
record_format |
openpolar |
spelling |
ftmdpi:oai:mdpi.com:/2073-4433/13/11/1763/ 2023-08-20T03:59:13+02:00 Comprehensive Validation and Calibration of MODIS PWV over Mainland China Yanyan Zhao Hongwei Zhao Junqiang Li Gongwei Xiao agris 2022-10-26 application/pdf https://doi.org/10.3390/atmos13111763 EN eng Multidisciplinary Digital Publishing Institute Atmospheric Techniques, Instruments, and Modeling https://dx.doi.org/10.3390/atmos13111763 https://creativecommons.org/licenses/by/4.0/ Atmosphere; Volume 13; Issue 11; Pages: 1763 MODIS PWV GNSS radiosonde China Text 2022 ftmdpi https://doi.org/10.3390/atmos13111763 2023-08-01T07:03:20Z Although ground-based precipitable water vapor (PWV) can be obtained with a high temporal resolution and spatial resolution of tens of kilometers in an urban area using Global Navigation Satellite System (GNSS) observation, it remains fairly sparse in the vast regions over Mainland China. Satellite-derived PWV has a high spatial resolution, thereby enabling the accurate investigation of regional climate change. However, understanding the quality of satellite-derived PWV products is a prerequisite before use, which has become the focus of this study. PWV products, namely, MOD05_L2 and MYD05_L2, over the entirety of Mainland China derived from MODerate Resolution Imaging Spectroradiometer (MODIS) onboard Terra and Aqua satellites are validated over the period 2000–2017 using multiple sources, including GNSS, radiosonde, AErosol RObotic NETwork (AERONET), and European Center for Medium-Range Weather Forecasts ERA-Interim (ECMWF). The accuracy of MODIS PWV products is less than 4.3 mm over the entirety of Mainland China; however, it varies in four areas of South China (SC), North China (NC), Northwest China (NWC), and Tibetan Plateau (TP), separately with values ranging from 3 mm to 6 mm. A linear fit model is applied to calibrate the MODIS PWV products, and the accuracies of the corrected PWV from MODIS infrared (IR) and near-infrared (NIR) products have been improved by approximately 7.5% and 50.6%, respectively. The MODIS PWV is compared and calibrated in the four areas, and the improved accuracies vary widely. The root mean square error (RMSE) of IR PWV is approximately less than 4 mm over China except for the SC area with a value of approximately 5.3 mm after calibration, whereas the values of NIR PWV are approximately 2 mm over the entirety of Mainland China, except for the TP area, with a value of approximately 2.6 mm. The MODIS NIR PWV performs better than that of IR PWV data in most areas of Mainland China regardless of whether with calibration. The validation and calibration of MODIS water vapor products ... Text Aerosol Robotic Network MDPI Open Access Publishing Atmosphere 13 11 1763 |
institution |
Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
MODIS PWV GNSS radiosonde China |
spellingShingle |
MODIS PWV GNSS radiosonde China Yanyan Zhao Hongwei Zhao Junqiang Li Gongwei Xiao Comprehensive Validation and Calibration of MODIS PWV over Mainland China |
topic_facet |
MODIS PWV GNSS radiosonde China |
description |
Although ground-based precipitable water vapor (PWV) can be obtained with a high temporal resolution and spatial resolution of tens of kilometers in an urban area using Global Navigation Satellite System (GNSS) observation, it remains fairly sparse in the vast regions over Mainland China. Satellite-derived PWV has a high spatial resolution, thereby enabling the accurate investigation of regional climate change. However, understanding the quality of satellite-derived PWV products is a prerequisite before use, which has become the focus of this study. PWV products, namely, MOD05_L2 and MYD05_L2, over the entirety of Mainland China derived from MODerate Resolution Imaging Spectroradiometer (MODIS) onboard Terra and Aqua satellites are validated over the period 2000–2017 using multiple sources, including GNSS, radiosonde, AErosol RObotic NETwork (AERONET), and European Center for Medium-Range Weather Forecasts ERA-Interim (ECMWF). The accuracy of MODIS PWV products is less than 4.3 mm over the entirety of Mainland China; however, it varies in four areas of South China (SC), North China (NC), Northwest China (NWC), and Tibetan Plateau (TP), separately with values ranging from 3 mm to 6 mm. A linear fit model is applied to calibrate the MODIS PWV products, and the accuracies of the corrected PWV from MODIS infrared (IR) and near-infrared (NIR) products have been improved by approximately 7.5% and 50.6%, respectively. The MODIS PWV is compared and calibrated in the four areas, and the improved accuracies vary widely. The root mean square error (RMSE) of IR PWV is approximately less than 4 mm over China except for the SC area with a value of approximately 5.3 mm after calibration, whereas the values of NIR PWV are approximately 2 mm over the entirety of Mainland China, except for the TP area, with a value of approximately 2.6 mm. The MODIS NIR PWV performs better than that of IR PWV data in most areas of Mainland China regardless of whether with calibration. The validation and calibration of MODIS water vapor products ... |
format |
Text |
author |
Yanyan Zhao Hongwei Zhao Junqiang Li Gongwei Xiao |
author_facet |
Yanyan Zhao Hongwei Zhao Junqiang Li Gongwei Xiao |
author_sort |
Yanyan Zhao |
title |
Comprehensive Validation and Calibration of MODIS PWV over Mainland China |
title_short |
Comprehensive Validation and Calibration of MODIS PWV over Mainland China |
title_full |
Comprehensive Validation and Calibration of MODIS PWV over Mainland China |
title_fullStr |
Comprehensive Validation and Calibration of MODIS PWV over Mainland China |
title_full_unstemmed |
Comprehensive Validation and Calibration of MODIS PWV over Mainland China |
title_sort |
comprehensive validation and calibration of modis pwv over mainland china |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2022 |
url |
https://doi.org/10.3390/atmos13111763 |
op_coverage |
agris |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_source |
Atmosphere; Volume 13; Issue 11; Pages: 1763 |
op_relation |
Atmospheric Techniques, Instruments, and Modeling https://dx.doi.org/10.3390/atmos13111763 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/atmos13111763 |
container_title |
Atmosphere |
container_volume |
13 |
container_issue |
11 |
container_start_page |
1763 |
_version_ |
1774722388501463040 |