Blue band reflectance uncertainties in coastal waters and their impact on retrieval algorithms

Eder Herrera Estrella; Philipp Grotsch; Alex Gilerson; Mateusz Malinowski; Sam Ahmed

doi:10.1117/12.2559895

13 May 2020 Blue band reflectance uncertainties in coastal waters and their impact on retrieval algorithms

Eder Herrera Estrella, Philipp Grotsch, Alex Gilerson, Mateusz Malinowski, Sam Ahmed

Proceedings Volume 11420, Ocean Sensing and Monitoring XII; 1142006 (2020) https://doi.org/10.1117/12.2559895
Event: SPIE Defense + Commercial Sensing, 2020, Online Only

Abstract

Blue bands on the satellite sensors are widely used in algorithms for the estimation of chlorophyll-a concentration and CDOM absorption. Recent studies showed that high uncertainties in these bands in coastal waters are not only due to inaccurate aerosol retrievals during atmospheric correction but also due to variable sky and sun glint that is reflected from the wind-roughened ocean surface, and which is especially pronounced in waters with low blue-band reflectance. These uncertainties are estimated for the 2019 VIIRS calibration/validation cruise by the comparison of data from several satellite sensors and in situ data. Results are compared with satellite – in situ matchups at the Long Island Sound Coastal Observatory (LISCO) and other AERONET-OC sites, showing significant vulnerability of blue bands reflectance to surface effects. It is shown that uncertainties in satellite R_rs retrievals can be explained predominantly with surface reflectance and in-water variability. Propagation of these increased uncertainty levels can be mitigated by avoiding blue bands in the retrieval of chlorophyll-a concentrations in coastal waters.

Citation Download Citation

Eder Herrera Estrella, Philipp Grotsch, Alex Gilerson, Mateusz Malinowski, and Sam Ahmed "Blue band reflectance uncertainties in coastal waters and their impact on retrieval algorithms", Proc. SPIE 11420, Ocean Sensing and Monitoring XII, 1142006 (13 May 2020); https://doi.org/10.1117/12.2559895

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KEYWORDS

Satellites

Reflectivity

Water

Sensors

Remote sensing

Spatial resolution

MODIS

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