Sensitivity of calibration gains to ocean color processing in coastal and open waters using ensembles members for NPP-VIIRS

R. Arnone, R. Vandermeulen, S. D. Ladner, J. Bowers, P. Martinolich, G. Fargion, M. Ondrusek, Weilin W. Hou, Robert A. Arnone
2014 Ocean Sensing and Monitoring VI  
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more » ... rvices and Communications Directorate (0704-01881. Respondents should be aware that notwithstanding any other provision of law, no person shali be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid 0MB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ORGANIZATION. REPORT DATE (DD-MM-YYYY) water types for Suomi-NPP VIIRS. Blue water vicarious gains from MOBY in situ data, which is used for global open waters, and green water gains derived from complex coastal WaveCIS AERONET waters, have a different impact on spectral normalized water leaving radiances and the derived ocean color products (inherent optical properties, chlorophyll). We evaluated the influence of gains from open and coastal waters by establishing a set of ensemble-processed products. The TOA gains show a non-linear impact on derived ocean color products, since gains affect multiple ocean color processing algorithms such as atmospheric correction, NIR iterations, etc. We show how the variations within the ensemble TOA gain members spatially impact derived products from different water types (high CDOM, high backscattering, etc). The difference in color products derived from the Blue and Green water gain show a spatial distribution to characterize the product uncertainty in coastal and open ocean water types. The resuhs of the ensemble gain members are evaluated with in situ matchups. Results suggest the sensitivity of the ocean color processing for open ocean verses coastal waters. 15. SUBJECT TERMS satellite, SNPP VllRS, ocean color, optics, validation, vicarious calibration 16. SECURITY CLASSIFICATION OF: a. REPORT Unclassified b. ABSTRACT Unclassified c. THIS PAGE Unclassified 17. LIMITATION OF ABSTRACT uu 18. NUMBER OF PAGES 7 19a. NAME OF RESPONSIBLE PERSON Sherwin Ladner 19b. TELEPHONE NUMBER (Include area code) (228) 688-5754 Standard Form 298 (Rev. 8/98) ABSTRACT The sensitivity of ocean color products to variations in vicarious calibration gains at Top of Atmosphere (TOA) shows varying impacts in different water types for Suomi-NPP VIIRS. Blue water vicarious gains from MOBY in situ data, which is used for global open waters, and green water gains derived from complex coastal WaveClS AERONET waters, have a different impact on spectral normalized water leaving radiances and the derived ocean color products (inherent optical properties, chlorophyll). We evaluated the influence of gains from open and coastal waters by establishing a set of ensemble-processed products. The TOA gains show a non-linear impact on derived ocean color products, since gains affect multiple ocean color processing algorithms such as atmospheric correction, NIR iterations, etc. We show how the variations within the ensemble TOA gain members spatially impact derived products from ditTerent water types (high CDOM, high backscattering, etc). The difference in color products derived from the Blue and Green water gain show a spatial distribution to characterize the product uncertainty in coastal and open ocean water types. The results of the ensemble gain members are evaluated with in situ matchups. Results suggest the sensitivity of the ocean color processing for open ocean verses coastal waters.
doi:10.1117/12.2053409 fatcat:d2ymfblxf5bwnihrj4in66vhxq