SS3.03 Recent Advances in Coastal and River Plume Remote Sensing
Date: Thursday, June 13, 2002
Time: 4:30:00 PM
Location: View Royal
 
NelsonJR, Skidaway Institute of Oceanography, Savannah, USA, nelson@skio.peachnet.edu
Blanton, J, O, Skidaway Institute of Oceanography, Savannah, USA, jack@skio.peachnet.edu
 
TEMPORAL EVOLUTION OF A CDOM EVENT ON THE CONTINENTAL SHELF OFF THE SE UNITED STATES
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River discharge to the South Atlantic Bight (SAB) in late winter-early spring of 1997-1998 was anomalously high, up to 4-5x the long-term average, followed by low discharge associated with the beginning of a prolonged drought. Shipboard measurements showed a low salinity surface layer extended across the shelf in April-May, carrying a strong optical signal due to high concentrations of colored dissolved organic matter (CDOM). We describe the development and dissipation of the CDOM signal, employing the 'acdm' product of SeaWiFS (recently added to the SeaDAS L2 product set). The stability of the mid-shelf water column, an important factor in the evolution of the event, is evaluated using ship CTD and buoy wind data. The CDOM event also provides a case study for the progression of SeaWiFS processing algorithms and geophysical product offerings since the beginning of operations. In particular, the retrieval of negative water-leaving radiance in Bands 1 and 2 has been greatly reduced (modified atmospheric correction), and a CDOM-related product is available. Regional adjustments may further enhance the application of various non-chlorophyll products in coastal environments.