9 September 2009 Particulate absorption properties from MODIS ocean color and four in-situ transects in the southeastern Bering Sea shelf during July 2008
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Abstract
Measurements of particulate absorption, namely absorption by phytoplankton and non-algal particles (NAP) are important components in bio-optical models; only a few studies have been reported for the southeastern Bering Sea. This study analyzes variability in spectral particulate absorption (aP(λ)) including phytoplankton (aPHY(λ)) and NAP absorption (aNAP(λ)) from in-situ data in conjunction with ocean color satellite data (MODIS - Moderate Resolution Imaging Spectroradiometer) along four transects in the southeastern Bering Sea shelf during a cruise in July 2008. Results obtained indicate that surface aPHY(λ) at 443 nm is higher in middle shelf near the Pribilof Islands with aNAP(λ) decreasing from north to south across the shelf. Greater than 90% of variability in aP(λ) could be explained by aPHY(λ) indicating biogenic matter dominates changes in particulate absorption. Good correlations were found between aP(λ), aPHY(λ) at 443 nm and chlorophyll-a (R2 = 0.65 and 0.80, respectively). aPHY(λ) spectra were highly variable, with larger variability in blue than red part of the spectrum, indicating change in pigment composition or package effect. MODIS satellite derived aPHY(λ) using quasi-analytical algorithms (QAA) revealed patterns similar to in-situ absorption data for a major part of the study area. Inconsistencies seen between in-situ absorption and QAA retrieved satellite absorption could probably be attributed to temporal differences between in-situ data collection and satellite overpass.
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Puneeta Naik, Puneeta Naik, Eurico J. D'Sa, Eurico J. D'Sa, Joaquim I. Goés, Joaquim I. Goés, Helga do R. Gomes, Helga do R. Gomes, } "Particulate absorption properties from MODIS ocean color and four in-situ transects in the southeastern Bering Sea shelf during July 2008", Proc. SPIE 7473, Remote Sensing of the Ocean, Sea Ice, and Large Water Regions 2009, 747302 (9 September 2009); doi: 10.1117/12.831351; https://doi.org/10.1117/12.831351
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