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INDIAN Satellite Radiances in UM Assimilation System: An initiative under IMDAA

INDIAN Satellite Radiances in UM Assimilation System: An initiative under IMDAA. Outline. National monsoon Mission (NMM) and IMDAA Megha-Tropiques’ SAPHIR radainces in OPS and VAR system INSAT-3D Sounder radainces in OPS and VAR system. National Monsoon Mission (NMM), India

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INDIAN Satellite Radiances in UM Assimilation System: An initiative under IMDAA

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  1. INDIAN Satellite Radiances in UM Assimilation System: An initiative under IMDAA

  2. Outline • National monsoon Mission (NMM) and IMDAA • Megha-Tropiques’ SAPHIR radainces in OPS and VAR system • INSAT-3D Sounder radainces in OPS and VAR system

  3. National Monsoon Mission (NMM), India • The major objectives of NMM are: • To setup a state of the art dynamical modeling frame work for improving prediction skill of • Seasonal and extended range prediction system • Short and medium range prediction system • 2. To setup the infrastructure and manpower required to improve the prediction skill at all time scales over Indian region • 3. To build a working partnership between the Academic/Research & Development Organizations and the operational Agency to improve the monsoon forecast skill. • IMDAA (Indian Monsoon Data Assimilation and Analysis) project under NMM • OPS and VAR code changes have been made to assimilate radiances from three instruments onboard Indian satellites. • Microwave sounder radiances from SAPHIR onboard Megha-Tropiques • Imager and Sounder radiances from INSAT-3D

  4. Megha-Tropiques The Megha Tropiques (MT), a joint Indo-French satellite, was launched by the Indian launch vehicle, PSLV-C18 on 12 October 2011. MT is positioned in a highly inclined equatorial plane of 20°at a height of 867 km above the Earth so as to orbit the tropical region (30°Sto 30°N) nearly 14–15 times per day. The four payloads on-board MT consisting ofa microwave radiometer(MADRAS), a microwave humidity sounder (SAPHIR), a radiation budget instrument (SCARAB) and a radio-occultation sounder (ROSA) are important for the study of tropical convective systems and hydrological cycle SAPHIR and SCARAB have across-track scanning, MADRAS has conical scanning. SAPHIR and SCARAB images are distorted at the Edge of the Swath, MADRAS images are not.

  5. SAPHIR Channels

  6. Bias Correction: SAPHIR ------------before Bias correction ------------- after bias correction Ch1 Ch2 Ch3 O - B C - B

  7. Bias Correction: SAPHIR contd... ------------before Bias correction ------------- after bias correction Ch4 Ch5 Ch6 O - B C - B

  8. VARSTATS: Impact on Microwave radiances

  9. VARSTATS: Impact on IR and WV radiances

  10. Verification against Observations: Tropics Height at 500hPa: Control:mi-ae010 Trial: mi-ae548 Control:mi-ae010 Trial: mi-ae055

  11. Verification against Observations: Tropics Height profiles Control:mi-ae010 Trial: mi-ae055

  12. Verification against Observations: Tropics Height profiles Control:mi-ae010 Trial: mi-ae055

  13. Verification against Observations: Tropics Relative Humidity Control:mi-ae010 Trial: mi-ae055

  14. Verification against Observations: Tropics Relative Humidity: Profiles Control:mi-ae010 Trial: mi-ae055

  15. SAPHIR: NWP Index Control:mi-ae010 Trial: mi-ae055

  16. SAPHIR: UK Index Control:mi-ae010 Trial: mi-ae055 UK Index:1.82% Control:mi-ae010 Trial: mi-ae548 UK Index: 2.66 %

  17. SAPHIR: UK Index

  18. INSAT3D: First geostationary sounder (82 °E) over India and surrounding oceanic regions, was launched on 26 July 2013. Has19 channel sounder and 6 channel Imager 19 channel Sounder Spectral Bands (µm) Short Wave Infra Red : 6 bands Middle Infra Red : 5 bands Long Wave Infra Red : 7 bands Visible : 1 band Resolution (km): 10 x 10 (all bands) 6 channel Imager Spectral Bands (µm) Visible : 0.55 - 0.75 Short Wave Infra Red : 1.55 - 1.70 Middle Infra Red : 3.80 - 4.00 Water Vapour : 6.50 -7.10 Thermal Infra Red-1 : 10.30 -1.30 Thermal infra Red-2 : 11.50 – 12.50 Resolution : 1 km VIS and SWIR 4 km MIR and TIR 8 km WV

  19. INSAT-3D Sounder Channels

  20. Bias Correction: INSAT3D Ch3 Ch1 Ch2 O - B C - B ------------before ------------- after

  21. Bias Correction: INSAT3D contd... Channel 6

  22. Bias Correction: INSAT3D contd... Channel 7

  23. Bias Correction: INSAT3D contd... Channel 8

  24. Ch10 Ch11 Ch12 O - B C - B ------------before ------------- after

  25. VARSTATS: Impact on IR/WV radiances

  26. VARSTATS: Impact on IR/WV radiances

  27. VARSTATS: Impact on MW radiances

  28. INSAT3D Sounder : NWP Index Control:mi-ad934 Trial: mi-ae385

  29. INSAT-3D Sounder: UK Index

  30. Remarks: Initial trial runs show positive impact of SAPHIR Microwave Radiances in UM Assimilation System. Reduced the standard deviation of radiances from MW, IR and WV channel instrument onboard other satellites. NWP index change of 0.367% and UK Index change of 1.82% over the Tropics. Near-neutral impact of INSAT-3D Sounder radiance in UM Assimilation System

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