HR: 14:00h
AN: OS23E-05    [Abstracts]
TI: CDOM Ocean Color Algorithm for a River-Dominated Coastal Environment: An Assessment
AU: * D'Sa, E
EM: ejdsa@lsu.edu
AF: Louisiana State University, Department of Oceanography and Coastal Sciences, Coastal Studies Institute, Baton Rouge, LA 70803, United States
AU: DiMarco, S
EM: sdimarco@tamu.edu
AF: Texas A&M University, Department of Oceanography, College Station, TX 77843, United States
AU: Miller, R
EM: Richard.L.Miller@nasa.gov
AF: NASA, Science and Engineering Division, Stennis Space Center, MS 39529, United States
AB: Colored dissolved organic matter (CDOM) absorption at 412 nm and the ratios of reflectances Rrs(412)/Rrs(510), Rrs443)/Rrs(510), and Rrs(510)/Rrs(555) were found to be highly correlated for coastal waters influenced by the Mississippi River. A preliminary assessment of these relationships indicate the Rrs(510)/Rrs(555) band ratio provides the best estimates of CDOM absorption from the Sea-viewing Wide Field-of-view Sensor (SeaWiFS) satellite imagery. Using an extensive field data set of CDOM absorption collected during four hydrographic cruises of the eastern Texas-Louisiana Shelf in March, May, July, and August of 2005, we further assess the performance of these algorithms in a highly dynamic coastal environment influenced by discharge from the combined Mississippi-Atchafalaya River system. Linear relationships between CDOM absorption and salinity during the various cruises indicated strong hydrographic controls on CDOM distribution with potential for using satellite ocean color data for estimating salinity patterns in coastal waters influenced by large rivers. As the fresh nutrient-rich river water controls the timing and placement of organic flux to the benthos, an improved CDOM algorithm for this system may have important implications for the prediction of the seasonal hypoxia in the region.
DE: 4217 Coastal processes
DE: 4264 Ocean optics (0649)
DE: 4271 Physical and chemical properties of seawater
DE: 4275 Remote sensing and electromagnetic processes (0689, 2487, 3285, 4455, 6934)
SC: Ocean Sciences [OS]
MN: 2007 Joint Assembly