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Model-based remote sensing algorithms for particulate organic carbon (POC) in the Northeastern Gulf of Mexico


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Title: Model-based remote sensing algorithms for particulate organic carbon (POC) in the Northeastern Gulf of Mexico
Authors: Son, Young Baek / Gardner, Wilford D. / Mishonov, Alexey V. / Richardson, Mary Jo
Issue Date: Feb-2009
Publisher: Springer India
Citation: Journal of Earth System Science, 118(1), pp.1-10; 2009
Abstract: Hydrographic data, including particulate organic carbon (POC) from the Northeastern Gulf of Mexico (NEGOM) study, were combined with remotely-sensed SeaWiFS data to estimate POC concentration using principal component analysis (PCA). The spectral radiance was extracted at each NEGOM station, digitized, and averaged. The mean value and spurious trends were removed from each spectrum. De-trended data included six wavelengths at 58 stations. The correlation between the weighting factors of the first six eigenvectors and POC concentration were applied using multiple linear regression. PCA algorithms based on the first three, four, and five modes accounted for 90, 95, and 98% of total variance and yielded significant correlations with POC with R2 = 0.89, 0.92, and 0.93. These full waveband approaches provided robust estimates of POC in various water types. Three different analyses (root mean square error, mean ratio and standard deviation) showed similar error estimates, and suggest that spectral variations in the modes defined by just the first four characteristic vectors are closely correlated with POC concentration, resulting in only negligible loss of spectral information from additional modes. The use of POC algorithms greatly increases the spatial and temporal resolution for interpreting POC cycling and can be extrapolated throughout and perhaps beyond the area of shipboard sampling.
Keywords: Particulate organic carbon / Principal component analysis / Remote sensing algorithm
URI: http://hdl.handle.net/10069/22903
ISSN: 02534126
DOI: 10.1007/s12040-009-0001-1
Rights: © Printed in India. / The original publication is available at www.springerlink.com
Type: Journal Article
Text Version: author
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/22903

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