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Mapping CDOM Concentration in Waters Influenced by the Mississippi River PlumeColored dissolved organic matter (CDOM) is often an important component of the organic carbon pool in river-dominated coastal margins. CDOM directly influences remote sensing applications through its strong absorption in the UV and blue regions of the spectrum. This effect can complicate the use of chlorophyll a retrieval algorithms and phytoplankton production models that are based on remotely sensed ocean color. As freshwater input is the principle source of CDOM in coastal margins, CDOM distribution can often be described by conservative mixing with open ocean waters and may serve as an optical tracer of riverine water. Hence, there is considerable interest in the ability to accurately measure and map CDOM concentrations as well as understand the processes that govern the optical properties and distribution of CDOM in coastal environments. We are examining CDOM dynamics in the waters influenced by the Mississippi River plume. Our program incorporates discrete samples, flow-through measurements, and remote sensing. CDOM absorption spectra of discrete samples are measured at sea using a portable, multiple pathlength waveguide system. A SAFire multi-spectral fluorescence meter provides spectral characterization of CDOM (fluorescence and absorption) using a ship flow-through system for continuous surface mapping. In situ reflectance spectra are obtained by a hand held spectroradiometer. Remotely sensed images are obtained from the SeaWiFS and CRIS (Coastal Research Imaging Spectrometer) instruments. We describe here the instruments used, sampling protocols employed, and the relationships derived between in situ measurements and remotely sensed data for this optically complex environment.
Document ID
20040005852
Document Type
Preprint (Draft being sent to journal)
Authors
Miller, Richard L. (NASA Stennis Space Center Stennis Space Center, MS, United States)
DelCastillo, Carlos E. (NASA Stennis Space Center Stennis Space Center, MS, United States)
Powell, Rodney T. (Louisiana Univ. Marine Consortium Chauvin, LA, United States)
DSa, Eurico (Louisiana Univ. Marine Consortium Chauvin, LA, United States)
Spiering, Bruce (NASA Stennis Space Center Stennis Space Center, MS, United States)
Date Acquired
August 21, 2013
Publication Date
May 1, 2002
Subject Category
Oceanography
Report/Patent Number
NASA/SE-2002-04-00035-SSC
Meeting Information
Oceans 2002 MTS/IEEE(Biloxi, MS)
Distribution Limits
Public
Copyright
Other