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  • AMER SOC LIMNOLOGY OCEANOGRAPHY  (1)
  • Extended Abstract of the Ocean Optics Conference XXIV, Dubrovnik, Croatia, 7 October 2018 - 12 October 2018  (1)
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  • 1
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    Mass-specific light absorption coefficients of natural aquatic particles in the near-infrared spectral region. (2014)
    AMER SOC LIMNOLOGY OCEANOGRAPHY
    In:  EPIC3Limnology and Oceanography, AMER SOC LIMNOLOGY OCEANOGRAPHY, 59(5), pp. 1449-1460, ISSN: 0024-3590
    Details
    Publication Date: 2014-07-23
    Description: The extent of light absorption in the near-infrared spectral region (NIR; 700­900 nm) of natural suspended particles was investigated by determining the absorption and mass-specific absorption coefficients of samples from different environments: river, coastal waters, tropical lagoon, and oceanic waters. Large amounts of sample were collected onto glass-fiber filters and measured inside the integrating sphere of a spectrophotometer. The absorption coefficient of particle suspension was also determined for visible wavelengths with a point-source integrating cavity absorption meter. Measurable nonzero particulate absorption in the NIR was determined in all samples, even in algal cultures. It was highest in the river samples (e.g., 1.7 m21 at 850 nm), reaching values similar to the NIR absorption of pure water--a strong NIR absorber. Lowest values were in oligotrophic waters and in algal cultures. Ratios of absorption at 750 nm to absorption at 442 and 672 nm varied between 2% to 30% and 3% to 80%, respectively. Mass-specific absorption in the NIR at 850 nm was also highest in the river (0.012 m2 g21) and lowest in oligotrophic waters (0.002­0.003 m2 g21). The observed NIR absorption can partly be explained by absorption of minerogenic particles, whereas the contribution of organic detritus to the NIR absorption is still mostly unknown.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 2
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    Retrieval of phytoplankton pigments and functional types from underway spectrophotometry in the Fram Strait (2018)
    Extended Abstract of the Ocean Optics Conference XXIV, Dubrovnik, Croatia, 7 October 2018 - 12 October 2018
    In:  EPIC3Extended Abstract of the Ocean Optics Conference XXIV, Dubrovnik, Croatia, 7 October 2018 - 12 October 2018
    Details
    Publication Date: 2018-11-29
    Description: Gaussian decomposition and Singular Value Decomposition combined with Non-Negative Least Squares (SVD-NNLS) method are compared and combined to estimate the concentration of 18 phytoplankton pigments (names and abbreviations are displayed in Table 2) from phytoplankton absorption spectra. Results show that both methods tend to overestimate pigment concentration. Gaussian decomposition method provides robust estimation of TChl-a, TChl-b, Chl-c1/2, PSC and PPC. The estimates of TChl-a, Fuco, Diato, $\beta$-Caro, Prasino, TChl-b, Zea, Viola and Lut from SVD-NNLS show reasonable estimation accuracy, while the other pigments are subjected to relatively large prediction errors. The estimated pigments concentrations are further exploited based on Diagnostic Pigment Analysis to derive four phytoplankton functional types, i.e. diatoms, prymnesiophytes, green algae and prokaryotes. By the application of these two methods to the particulate absorption spectra collected by underway spectrophotometry during three summer cruises in 2015 - 2017 in the Fram Strait, continuous surface phytoplankton functional types are estimated along the cruise course.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Book , peerRev
    Format: application/pdf
    Location Call Number Limitation Availability
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    PAPER (OA)
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