Moderate Resolution Imaging Spectroradiometer (MODIS) marine and atmospheric products were evaluated using match-ups of MODIS and in situ measurements collected by an above-water radiometric system, the SeaWiFS Photometer Revision for Incident Surface Measurements (SeaPRISM), deployed near the Martha's Vineyard Coastal Observatory from 2004 to 2005. The products evaluated include the normalized water-leaving radiance L wn in the visible and near-infrared bands, and the aerosol optical thickness at 870 nm a(870), and the Ångstrom exponent α(531). With a restricted match-up criterion, the result shows that the MODIS-retrieved L wn at 488, 531 and 551 nm agree very well with SeaPRISM measurements, giving mean per cent differences (%) of 3-7%, absolute mean per cent differences ||(%) of ∼16%, and coefficient of determination R 2 of 0.84-0.88. However, the MODIS-retrieved L wn at 412 nm are underestimated significantly with (%), ||(%) and R 2 of -35%, 57% and 0.32, respectively, corresponding to a consistent overestimation and underestimation for the MODIS-retrieved a(870) and α(531), respectively. Temporal patterns of match-ups revealing two distinct cases of the discrepancy of MODIS retrievals from in situ SeaPRISM measurements are discussed.
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Document Type: Research Article
Ocean Process Analysis Laboratory, Institute for the Study of Earth, Oceans and Space, University of New Hampshire, Durham, USA
NASA Goddard Space Flight Center, Greenbelt, USA
January 1, 2008
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