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Evaluation of MODIS ocean colour products at a northeast United States coast site near the Martha's Vineyard Coastal Observatory

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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

Affiliations: 1: Ocean Process Analysis Laboratory, Institute for the Study of Earth, Oceans and Space, University of New Hampshire, Durham, USA 2: NASA Goddard Space Flight Center, Greenbelt, USA

Publication date: January 1, 2008

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