Preprints
https://doi.org/10.5194/amt-2021-236
https://doi.org/10.5194/amt-2021-236

  04 Aug 2021

04 Aug 2021

Review status: this preprint is currently under review for the journal AMT.

Evaluation and Application of Precipitable Water Vapor Product from MERSI-II onboard the Fengyun-3D Satellite

Wengang Zhang1, Ling Wang2,3, Yang Yu1, Guirong Xu1, Xiuqing Hu2,3, Zhikang Fu1, and Chunguang Cui1 Wengang Zhang et al.
  • 1Hubei Key Laboratory for Heavy Rain Monitoring and Warning Research, Institute of Heavy Rain, China Meteorological Administration, Wuhan 430205, China
  • 2Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites, China Meteorological Administration, Beijing 100081, China
  • 3National Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, China

Abstract. The evaluation of precipitable water vapor (PWV) derived from the advanced Medium Resolution Spectral Imager (MERSI-II) onboard FengYun-3D is performed with the PWV from Integrated Global Radiosonde Archive (IGRA) based on 626 sites (54214 match-ups) in total during 2018–2021. The averaged PWVs from MERSI-II and IGRA both present the distribution opposite to latitude, with great PWV mostly found in the tropics. In general, a good consistency exists between the PWVs of MERSI-Ⅱ and IGRA, and their correlation coefficient is 0.9400 and root mean squared error (RMSE) is 0.31 cm. The peak values of mean bias (MB) and the mean relative bias (MRB) are 0.00 cm and −2.38 %, with the standard deviations of 0.25 cm and 16.8 %, respectively. For most sites, the PWV is underestimated with the MB between −0.28 cm and 0.05 cm. However, there is also overestimated PWV, which is mostly distributed in the surrounding areas of the Black Sea and the middle of South America. The peak values of MB are found in February and July over the Southern and Northern Hemisphere, respectively. More than 66.91 % of retrievals falling within the except error (EE) envelope during all months. Overall, the MRB and RMSE become larger with the increasing temporal and distance discrepancy, and it is contrast for EE and correlation coefficient. Besides, the distance discrepancy impacts the evaluation more. The application of PWV product over Qinghai-Tibet Plateau shows that the transport of water vapor along the Brahmaputra Grand Canyon is obvious and it is more significant in July.

Wengang Zhang et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2021-236', Anonymous Referee #1, 19 Aug 2021
  • RC2: 'Comment on amt-2021-236', Anonymous Referee #2, 23 Aug 2021
  • RC3: 'Comment on amt-2021-236', Anonymous Referee #3, 01 Sep 2021

Wengang Zhang et al.

Wengang Zhang et al.

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Short summary
Global precipitable water vapor (PWV) derived from MERSI-II is evaluated by comparing with PWV obtained from Integrated Global Radiosonde Archive (IGRA). Our results show that there is a good agreement between PWVs from MERSI-Ⅱ and IGRA, and the MERSI-Ⅱ PWV is slight underestimated on the whole. The discrepancy of distance has more effects than temporal discrepancy in the evaluation. There is a good application of the MERSI-Ⅱ PWV over QTP on the analysis for the distribution of water vapor.