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GK-2A’s AMV and CSR Data Release on GTS
2020/06/08
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GK-2A’s AMV and CSR Data Release on GTS


The Korea Meteorological Administration (KMA) has announced that Atmospheric Motion Vector (AMV) and Clear Sky Radiance (CSR) products from the Geostationary Earth Orbit–Korea Multi-Purpose Satellite–2A (GK-2A)’s observation data will be released on the Global Telecommunication System (GTS) from 25 June 2020. The file format of the AMV and CSR output is the Binary Universal Form for the Representation of meteorological data (BUFR). Preliminary results from our test on the KMA’s Numerical Weather Prediction (NWP) system have shown that the GK-2A’s AMV and CSR data have positive effects.


The GK-2A is Korea’s second geostationary meteorological satellite launched on 4 December 2018. It has an Advanced Meteorological Imager (AMI) with 16 channels. KMA has been officially operating the GK-2A since July 2019. KMA wanted to distribute the AMV and CSR products first, and in the future All Sky Radiance (ASR) product will also be added on the GTS.

Please refer to the following sections for a brief explanation of the AMV and CSR data.


For more information, please contact JaeGwan Kim (kimjgwan@korea.kr).



1. GK-2A’s AMV data


The GK-2A’s AMV product is defined as the output of the atmospheric movement obtained by tracking clouds or water vapor fields with the satellite. To calculate the motion vectors, consecutive three images are used in a time series.


GK-2A AMV product information for BUFR file


WMO BUFR Master table version: 32 (Table Reference: 310077)


Channels: VIS (0.6 ), SWIR (3.8 ), WV (6.3, 6.9, 7.3 ), IR (10.5, 11.2 )


Spatial Resolution: 24 x 24 km² for VIS, 32 x 32 km² for SWIR, WV, and IR


AMV Product Temporal Resolution: 30 minutes


Observation Mode: Full Disk


Satellite Orbit: 128.2E GEO


Valid Output Area: Satellite (Viewing) Zenith Angle within 70 degrees


Major Components of Subset: Wind Direction, Wind Speed, Height Assignment Method, Pressure, QI Index, Satellite Zenith Angle, Solar Zenith Angle, etc.


File Division


1. Classified by channels


2. Bulletin header: INVN##_RKSL for northern hemisphere,


INVS##_RKSL for southern hemisphere


Sample images  

01



2. GK-2A’s CSR data


The GK-2A’s CSR product is defined as the output of the area-averaged brightness temperatures for given pixels in the clear sky area observed by the satellite.


GK-2A CSR product information for BUFR file


Channels: SWIR (3.8 ), WV (6.3, 6.9, 7.3 ), IR (8.7, 9.6, 10.5, 11.2, 12.3, 13.3 )



Spatial Resolution: 24 x 24 km²


CSR Product Temporal Resolution: 30 minutes (or 10 minutes: To Be Confirmed)


Observation Mode: Full Disk


Satellite Orbit: 128.2E GEO


Valid Output Area: Satellite (Viewing) Zenith Angle within 80 degrees


Major Components of Subset: Bright Temperature for 10 channels, Standard Deviation, Clear Pixel Ratio, Land/Sea Qualifier, Satellite Zenith Angle, Solar Zenith Angle, etc.


File Division (Bulletin header): “INRN##_RKSL” for northern hemisphere,


“INRS##_RKSL” for southern hemisphere


Notice

  1. The GK2A’s CSR utilizes the GK-2A cloud detection (CLD) to screen cloudy sky pixels.

  2. For the Water Vapor channels, low-level cloudy pixels are regarded as a clear sky area where the contribution of cloud top emission is negligible compared to the satellite observed radiance.


Sample images 

02








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