Model-based remote sensing algorithms for particulate organic carbon (POC) in the Northeastern Gulf of Mexico |
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| Authors: | Young Baek Son Wilford D Gardner Alexey V Mishonov Mary Jo Richardson |
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| Institution: | (1) Department of Fisheries, Nagasaki University, 1-14 Bunkyo, Nagasaki, Nagasaki 852-8521, Japan;(2) Department of Oceanography, Texas A&M University, College Station, Texas 77843-3146, USA;(3) National Oceanographic Data Center, 1315 East West Highway, Silver Spring, MD 20910-3282, USA |
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| 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 R
2 = 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. |
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| Keywords: | Particulate organic carbon principal component analysis remote sensing algorithm |
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