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Discussion papers | Copyright
https://doi.org/10.5194/amt-2018-8
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 27 Feb 2018

Research article | 27 Feb 2018

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This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Atmospheric Measurement Techniques (AMT) and is expected to appear here in due course.

Potential of INSAT-3D Sounder Derived Total Precipitable Water Product for Weather Forecast

Shailesh Parihar1, Ashim Kumar Mitra1, and Rajiv Bhatla2 Shailesh Parihar et al.
  • 1India Meteorological Department, New Delhi - 110003
  • 2Banaras Hindu University, Varanasi - 221005

Abstract. INSAT-3D satellite objectives to upgrade the meteorological observation, monitoring of earth surface atmosphere for weather forecasting and disaster warning. The amount of the water vapor present in atmospheric column in the form of total precipitable water (TPW) derived product from atmospheric sounding system is one such weather monitoring capability in the INSAT-3D payload. The current study is based on INSAT-3D satellite sounder derived TPW and corresponding TPW from radiosonde observations (RS) and National Oceanic and Atmospheric Administration (NOAA), N-18 and N-19 have been used to assess retrieval performances. The RS TPW from 34 India Meteorological Department (IMD) stations over the Indian region from May to September 2016 has been considered for the validation. The analysis is performed on daily, monthly, sub-divisional and overall basis over the Indian region. On daily and monthly scale against RS TPW, the root mean square error (RMSE) and correlation coefficients (CC) of INSAT-3D TPW are in and around of 8mm and above 0.8 respectively. However, on sub-divisional and overall scale, the RMSE found to be in the range of 1 to 2mm and CC was around 0.9 in comparison with RS and NOAA. The spatial distribution of INSAT-3D TPW with actual rainfall observation is also been investigated. In general, INSAT-3D TPW correspond well with rainfall observation however, heavy rainfall events occurs in the presence of high TPW values. Furthermore, a case study with INSAT-3D TPW and ground based Global Navigation Satellite System (GNSS) receiver network have been demonstrated. It is noticed that, INSAT-3D TPW can be considered as a precursor for mesoscale activity very well. The purpose of this study is to investigate the potential use of operational INSAT-3D sounder derived TPW to weather forecast. However, the major source of improvement in INSAT-3D TPW is mainly applying the GSICS calibration corrections (Global Space-based Inter-Calibration System) on Infra-Red (IR) sounder channels at IMDPS, New Delhi, which aims to produce corrections, ensuring the data consistency and allowing them to be used to produce globally homogeneous products for environmental monitoring. The current TPW from INSAT-3D satellite can be utilized operationally for weather purpose and it can also offer substantial opportunities for improvement in now casting studies.

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Shailesh Parihar et al.
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Shailesh Parihar et al.
Shailesh Parihar et al.
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Current work is based on operational work carried out at IMD, New Delhi using INSAT-3D satellite derived sounder product TPW for the weather events such as rainfall and thunderstorm. The INSAT-3D TPW is being used by forecasters as well as many user community from last 2 years. This work is mainly bring out the in-depth validation with in-situ ground measurement data as well as GNSS system for its suitability in weather prediction. This paper can be utilized operationally for weather purpose.
Current work is based on operational work carried out at IMD, New Delhi using INSAT-3D satellite...
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