Atmospheric Correction of Ocean Color Measurements For the NPOESS/VIIRS Sensor
Abstract
Measurements of ocean color from space are challenging because about 90% of the radiation reaching a satellite sensor come from atmospheric scattering and sea-surface reflection. Removal of these effects is crucial to the retrieval of accurate ocean color information. This atmospheric correction procedure takes into account sea-surface reflection along with atmospheric scattering and absorption. The US National Polar-orbiting Operational Environmental Satellite System Visible/ Infrared Radiometer Suite (NPOESS/ VIIIRS) is currently being developed and ocean color measurements will be generated as one of the VIIRS data products. The atmospheric correction methods for the VIIRS ocean color data are adapted from those developed for the Moderate Resolution Imaging Spectrometer (MODIS) and the Sea-viewing Wide Field-of-view Sensor (SeaWiFS). The multi-spectral bands, from visible to infrared wavelengths, from the VIIRS sensor are expected to provide an accurate cloud mask. The sea surface wind vector based on NPOESS' Conical Scanning Microwave Imager/ Sounder (CMIS) is used to determine whether any pixel is contaminated by sun glint and to correct for the effects of whitecaps, including the spectral dependence of whitecap reflectance. The ozone absorption is corrected based on information derived from the ozone product of the NPOESS Ozone Mapping and Profiling Suite (OMPS). The Rayleigh scattering effect is removed based on the surface pressure from NCEP data. An aerosol model is selected based on near infrared 751nm and 865 nm reflectances, then used to remove the effects of single and multiple aerosol scattering on the visible VIIRS bands. Results of NPOESS/ VIIRS algorithm tests are presented.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2001
- Bibcode:
- 2001AGUFMOS52A0519C
- Keywords:
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- 1635 Oceans (4203);
- 1640 Remote sensing;
- 4806 Carbon cycling;
- 4855 Plankton;
- 6969 Remote sensing