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See Platform deployments for cruise specific documentation<\/p>\n
\nProcess Cruises 2, 6 and 7\n\nChuck Trees\nParticulate absorption methodology\nArabesque 1 and Process Cruises 2, 6 and 7\n\nParticulate matter was collected by filtering approximately 1.1 liters of\nsample through 25 mm GF\/F glass fiber filters having a nominal pore size\nof 0.7 micrometers. Spectral absorption was measured on a Perkin-Elmer\nLambda 3b dual beam spectrophotometer. Diffuse absorption coefficients\nfor total particulate matter was calculated using the equations described\nin the SeaWiFS Optical Protocols (Mueller and Austin, 1995) and a pathlength\namplification factor determined from two diatom cultures. The amplification\nfactor, beta, is calculated by plotting optical densities on a filter versus\noptical densities in suspension and fitting a 2nd order polynomial to the\ndata. 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