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Saginaw Bay Area of Concern Color Producing Agents

Saginaw Bay Area of Concern Color Producing Agents. 2012. Color Producing Agents. Water color in inland and coastal water results mainly from three different parameters, known as color-producing agents (CPAs):

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Saginaw Bay Area of Concern Color Producing Agents

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  1. Saginaw Bay Area of Concern Color Producing Agents 2012

  2. Color Producing Agents • Water color in inland and coastal water results mainly from three different parameters, known as color-producing agents (CPAs): • Chlorophyll (CHL): A green pigment found in plant cells. Algal cells that are suspended in water produce a green-yellow color. • Dissolved Organic Carbon (DOC): Organic carbons that are produced as part of micro-organism metabolism or are transported from decaying vegetation products via rivers and streams. DOC only absorbs light, it doesn’t scatter it. It appears yellow to brown in color (CDOM). • Suspended Minerals (SM): Inorganic particulate matter. Scatters and absorbs light. SM DOC CHL

  3. Color Producing Agents • Hydro-optical (HO) models are tables of specific backscattering and absorption coefficients • Different bodies of water have different HO models • Similar types of water bodies have similar HO-models, such as Lake Michigan and Lake Huron • HO model depends of what type of CPAs are in the water

  4. CPA Algorithm • Given an HO-model for a body of water, CPA concentration images can be produced from satellite reflectance images using multivariate inverse procedures • Our algorithm uses the Levenburg-Marquardt (LM) procedure for finding a solution to the inverse problem • A CPA concentration vector is found which minimizes the error between the measured and calculated RSR • For more information about our CPA Algorithm, please contact Dr. Robert Shuchman: shuchman@mtu.edu

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