Sources and assumptions for the vicarious calibration of ocean color satellite observations
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Spaceborne ocean color sensors require vicarious calibration to sea-truth data to achieve accurate waterleaving radiance retrievals. The assumed requirements of an in situ data set necessary to achieve accurate vicarious calibration were set forth in a series of papers and reports developed nearly a decadeago, which were embodied in the development and site location of the Marine Optical BuoY (MOBY).Since that time, NASA has successfully used data collected by MOBYas the sole source of sea-truth data for vicarious calibration of the Sea-viewing Wide field-of-view Sensor (SeaWiFS) and Moderate Resolution Imaging Spectroradiometer instruments. In this paper, we make use of the 10-year, global time series of SeaWiFS measurements to test the sensitivity of vicarious calibration to the assumptions inherent in the in situ requirements (e.g., very low chlorophyll waters, hyperspectral measurements). Our study utilized field measurements from a variety of sources with sufficient diversity in data collection methods and geophysical variability to challenge those in situ restrictions.We found that some requirements could be relaxed without compromising the ability to vicariously calibrate to the level required for accurate water-leaving radiance retrievals from satellite-based sensors.
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Leymarie, E.; Penkerc'h, C.; Vellucci, V.; Lerebourg, C.; Antoine, David; Boss, E.; Lewis, M.; D'Ortenzio, F.; Claustre, H. (2018)An efficient system to produce in situ high quality radiometric measurements is compulsory to rigorously perform the vicarious calibration of satellite sensors dedicated to Ocean Color Radiometry (OCR) and to validate ...
System Vicarious Calibration for Ocean Color Climate Change Applications: Requirements for In Situ DataZibordi, G.; Mélin, F.; Voss, K.; Johnson, C.; Franz, B.; Kwiatkowska, E.; Huot, J.; Wang, M.; Antoine, David (2015)System Vicarious Calibration (SVC) ensures a relative radiometric calibration to satellite ocean color sensors that minimizes uncertainties in the water-leaving radiance Lw derived from the top of atmosphere radiance LT. ...
Assessment of uncertainty in the water-leaving reflectance determined by three satellite ocean color sensors (MERIS, SeaWiFS, MODIS-A) at an offshore site in the Mediterranean Sea (BOUSSOLE project)Antoine, David; D’Ortenzio, F.; Hooker, S.; Becu, G.; Gentili, B.; Tailliez, D.; Scott, A. (2008)The match-up of satellite-derived reflectances with in situ observations is crucial to evaluate their quality and temporal stability. To contribute to this effort, a project has been set up to collect a data set of in ...