Preprints
https://doi.org/10.5194/amt-2021-4
https://doi.org/10.5194/amt-2021-4

  20 Jan 2021

20 Jan 2021

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

Inter-comparison of retrievals of Integrated Precipitable Water Vapour IPWV) made by INSAT-3DR satellite-borne Infrared Radiometer Sounding and CAMS reanalysis data with ground-based Indian GNSS data

Ramashray Yadav, Ram Kumar Giri, and Virendra Singh Ramashray Yadav et al.
  • Satellite Meteorology Division, India Meteorological Department, Ministry of Earth Sciences New Delhi-110003

Abstract. The spatiotemporal variations of integrated precipitable water vapor (IPWV) are very important to understand the regional variability of water vapour. Traditional in-situ measurements of IPWV in Indian region are limited and therefore the performance of satellite and Copernicus Atmosphere Meteorological Service (CAMS) retrievals with Indian Global Navigation Satellite System (GNSS) taking as reference has been analyzed. In this study the CAMS reanalysis retrieval one year (2018), Indian GNSS and INSAT-3DR sounder retrievals data for one & half years (January-2017 to June-2018) has been utilized and computed statistics. It is noticed that seasonal correlation coefficient (CC) values between INSAT-3DR and Indian GNSS data mainly lie within the range of 0.50 to 0.98 for all the selected 19 stations except Thiruvanathpuram (0.1), Kanyakumari (0.31), Karaikal (0.15) during monsoon and Panjim (0.2) during post monsoon season respectively. The seasonal CC values between CAMS and INSAT-3DR IPWV are ranges 0.73 to .99 except Jaipur (0.16) & Bhubneshwar (0.29) during pre-monsoon season, Panjim (0.38) during monsoon, Nagpur (0.50) during post-monsoon and Dibrugarh (0.49) Jaipur (0.58) & Bhubneshwar (0.16) during winter season respectively .The root mean square error (RMSE) values are higher under the wet conditions (Pre Monsoon & Monsoon season) than under dry conditions (Post Monsoon & Winter season) and found differences in magnitude and sign of bias of INSAT-3DR, CAMS with respect to GNSS IPWV from station to station and season to season.

This study will help to improve understanding and utilization of CASMS and INSAT-3DR data more effectively along with GNSS data over land, coastal and desert locations in term of seasonal flow of IPWV which is an essential integrated variable in forecasting applications.

Ramashray Yadav et al.

Status: open (until 31 Mar 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2021-4', Anonymous Referee #1, 02 Feb 2021 reply
    • AC1: 'Reply on RC1', Ramashray Yadav, 05 Feb 2021 reply
  • RC2: 'Comment on amt-2021-4', Anonymous Referee #1, 08 Feb 2021 reply

Ramashray Yadav et al.

Ramashray Yadav et al.

Viewed

Total article views: 425 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
375 39 11 425 2 20
  • HTML: 375
  • PDF: 39
  • XML: 11
  • Total: 425
  • BibTeX: 2
  • EndNote: 20
Views and downloads (calculated since 20 Jan 2021)
Cumulative views and downloads (calculated since 20 Jan 2021)

Viewed (geographical distribution)

Total article views: 381 (including HTML, PDF, and XML) Thereof 378 with geography defined and 3 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 02 Mar 2021
Download
Short summary
We did Inter-comparison of seasonal and annual study of retrievals of Integrated Precipitable Water Vapour IPWV) made by INSAT-3DR satellite-borne Infrared Radiometer Sounding and CAMS reanalysis data with ground-based Indian GNSS data. The magnitude and sign of bias of INSAT-3DR, CAMS with respect to GNSS IPWV from station to station and season to season. Statistical evaluation of the collocated data sets have been done to improve day to day weather forecasting.