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TOA Radiative products

ScaRaB-3 (Scanner for Radiation Budget) is an optical scanning radiometer devoted to the measurements of radiative fluxes at the top-of-atmosphere (TOA) in the shortwave and longwave domain, described in Chomette et al, 2010.The TOA albedo is also computed.

Level-2 products

The level-2 product contains instantaneous top-of-atmosphere fluxes and albedo at ScaRaB pixel scale.  The conversion between radiance and hemispherical flux is obtained with an algorithm based on an artificial neural network approach and is called SANN (ScaRaB Artificial Neural Network). You can find a description of this approach in Viollier et al. (2009). 

In the level-2 products, the user can also find the unfiltered radiances for ScaRaB-3 deduced from the filtered radiances. The unfiletered radiances are obtained using computing scene dependent factor.

In Figure 1, we have the SANN Flux for one orbit on the 09 december 2011. 

SANN_L2_lw.png
 
Sann_L2_sw.png
 
Figure 1: Example of instantaneous LW (top) and SW  L2 fluxes in Wm-2.   
 

Level-2B products

The Level 2-SANN product has also been projected (with a PSF approach, see gif et al. 2011) on a 1°x1° grid to create this L2-B product. The Figure 2 shows an example.   

 

L2B_LW.png

 

Figure 2: TOA Longwave Fluxes Level 2B. 
 
  

Contacts

Rémy Roca : This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Olivier Chomette : This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Patrick Raberanto : This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Documentation

Product Definition Document: Top Of the Atmosphere Fluxes & Albedo, L2 products derived from SCARAB (L2 files format UPDATED March 2015)

Level 1 products definition  (CNES documentation)

References 

Gif, N., O. Chomette, and P. Raberanto, 2011: Co-location algorithms. Geophysical data projection using pixel point spread function.Megha-Tropiques Technical Memorandum n°2  

Viollier, M., C. Standfuss, O. Chomette and A.Quesney 2009: Top-of-Atmosphere Radiance-to-Fluxconversion in the SW domain for the ScaRaB-3 instrument on Megha-Tropiques. J. Atmos. Oceanic Technol., 26, 2161-2171.

Chomette, O., P. Raberanto, and R. Roca: The SCARAB instrument on the Megha-Tropiques missionproceeding of the 13th Conference on Atmospheric Radiation, American Meteorological Society,  28 June – 2 July 2010, Portland, Oregon.    

 

Last Updated ( Monday, 09 March 2015 )