Cross calibration of ocean-color bands from moderate resolution imaging spectroradiometer on Terra platform.
Ocean-color applications require maximum uncertainties in blue-wavelength water-leaving radiances in oligotrophic ocean of approximately 5%. Water-leaving radiances from Moderate Resolution Imaging Spectroradiometer (MODIS) on the Terra satellite, however, exhibit temporal drift of the order of 15% as well as sensor changes in response versus scan and polarization sensitivity, which cannot be tracked by onboard calibrators. This paper introduces an instrument characterization approach that uses Earth-view data as a calibration source. The approach models the top of the atmosphere signal over ocean that the instrument is expected to measure, including its polarization, with water-leaving radiances coming from another well-calibrated global sensor. The cross calibration allows for significant improvement in derived MODIS-Terra ocean-color products, with largest changes in the blue wavelengths.
Kwiatkowska
Ewa J
EJ
Ocean Biology Processing Group, 614.8, National Aeronautics and Space Administration, Goddard Space Flight Center, Maryland 20771, USA. ewa.kwiatkowska@gmail.com
Franz
Bryan A
BA
Meister
Gerhard
G
McClain
Charles R
CR
Xiong
Xiaoxiong
X
D002138:Calibration; D003116:Color; D003124:Colorimetry / Q000295:instrumentation / Q000592:standards; D004784:Environmental Monitoring / Q000295:instrumentation* / Q000592:standards*; D009792:Oceans and Seas; D018531:Spacecraft / Q000295:instrumentation* / Q000592:standards*; D013057:Spectrum Analysis / Q000295:instrumentation* / Q000592:standards*