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+ Earth Observing System > For Scientists > Validation Program > Terra Validation > Marine Optical and Biological Measurements from the Atlantic Meridional Transect for MODIS Calibration and Validation EOS Validation ProgramMarine Optical and Biological Measurements from the Atlantic Meridional Transect for MODIS Calibration and ValidationStanford B. HookerInstitution: NASA Goddard Space Flight Center Co-Investigators:Charles R. McClain, GSFC EOS Teams: MODISCERES NASA EOS-PSO funding through FY02: $602,100 Progress Reports ABSTRACTThe proposed work is relevant for calibration and validation of SeaWiFS, MODIS, ADEOS/OCTS data and other ocean color missions. This measurement program is based on the Atlantic Meridional Transect (AMT) cruises which are conducted twice a year between UK and the Falkland Islands. Five weeks, 50N-50S cruises intersect a broad variety of oceanic systems and atmospheric aerosol regimes. The optical data collection is conducted with several instruments discrete band profiling radiometers (7 channels), two free-fall profiling systems (13 channels) and a hyperspectral radiometer. Such deployment scheme allows intercomparisons between radiometers and assessments of experimental and environmental variability. All instruments are calibrated at least twice a year and their stability during the cruises is verified after every cast using the SeaWiFS Quality Monitor (SQM) built by NIST. CTD, AC-9, fluorometric measurements and HPLC analyses are also performed. The shipboard data are processed in near-real time and can be easily transferred to the SeaWiFS, MODIS and SIMBIOS Projects for comparison with satellite data and archival in the SeaWiFS Bio-optical Archive and Storage System which will also be utilized by SIMBIOS. Beside basic in-water radiance and irradiance measurements, typical "near-real time" derived products are Remote-sensing reflectances, Normalized Water-Leaving Radiances, Diffuse attenuation coefficients as well as CTD and fluorometric measurements. |
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