Two models for absorption by coloured dissolved organic matter (CDOM)

• Autorzy: Schwarz J. N. , Kowalczuk P. , Kaczmarek S. , Cota G. F. , Mitchell B. G. , Kahru M. , Chavez F. P. , Cunningham A. , McKee D. , Gege P. , Kishino M. , Phinney D. A. , Raine R.
• Języki publikacji: EN

Abstrakty

EN

The standard exponential model for CDOM absorption has been applied to data from diverse waters. Absorption at 440 nm (ag440) ranged between close to zero and 10 m-1, and the slope of the semilogarithmic absorption spectrum over a minimum range of 400 to 440 nm (s440) ranged between < 0.01 and 0.04 nm-1. No relationship was found between ag440 or s440 and salinity. Except in the southern Baltic, s440 was found to have a broad distribution (0.0165 š 0.0035), suggesting that it should be introduced as an additional variable in bio-optical models when ag440 is large. An alternative model for CDOM absorption was applied to available high quality UV-visible absorption spectra from the Wisla river (Poland). This model assumes that the CDOM absorption spectrum comprises distinct Gaussian absorption bands in the UV, similar to those of benzene. Five bands were fit to the data. The mean central energy of all bands was higher in early summer (E~7.2, 6.6, 6.4, 6.2 and 5.5 eV or 172, 188, 194, 200 and 226 nm) than in winter. The higher energy bands were found to decay in both height and width with increasing salinity, while lower energy bands broadened with increasing salinity. s440 was found to be correlated with shape parameters of the bands centred at 6.4 and 5.5 eV. While the exponential model is convenient for optical modelling and remote sensing applications, these results suggest that the Gaussian model offers a deeper understanding of chemical interactions affecting CDOM molecular structure.

Słowa kluczowe

EN

CDOM; Gelbstoff; ocean colour; UV absorption

• Wydawca: Polish Academy of Sciences, Institute of Oceanology ; Elsevier
• Czasopismo: Oceanologia
• Rocznik: 2002
• Tom: No. 44 (2)
• Strony: 209--241
• Opis fizyczny: Bibliogr. 80 poz., rys., tab., wykr.

Twórcy

autor

Schwarz J. N.

• Remote Sensing Technology Institute, German Aerospace Centre, Rutherfordstr. 2, 12489 Berlin, Germany
• Alfred Wegener Institute for Polar & Marine Research, Postfach 12 0161, 27515 Bremerhaven, Germany

autor

Kowalczuk P.

• Institute of Oceanology, PAS, Powstańców Warszawy 55, 81-712 Sopot, Poland, P.O. Box 68

autor

Kaczmarek S.

• Institute of Oceanology, PAS, Powstańców Warszawy 55, 81-712 Sopot, Poland, P.O. Box 68

autor

Cota G. F.

• Center for Coastal Physical Oceanography, Old Dominion University, 768W 52nd Street, Norfolk, VA 23508, USA

autor

Mitchell B. G.

• Scripps Institution of Oceanography, 9500 Gilman Dr., La Jolla, CA 92093-0218, USA

autor

Kahru M.

• Scripps Institution of Oceanography, 9500 Gilman Dr., La Jolla, CA 92093-0218, USA

autor

Chavez F. P.

• Monterey Bay Aquarium, Research Institute, 7700 Sandholdt Road, Moss Landing, CA 95039-9644, USA

autor

Cunningham A.

• Dept. Physics & Applied Physics, University of Strathclyde, 107 Rottenrow, Glasgow, G4 0NG, U.K.

autor

McKee D.

• Dept. Physics & Applied Physics, University of Strathclyde, 107 Rottenrow, Glasgow, G4 0NG, U.K.

autor

Gege P.

• Remote Sensing Technology Institute, German Aerospace Centre, Oberpfaffenhofen, 82234 Wessling, Germany

autor

Kishino M.

• RIKEN - The Institute of Physical and Chemical Research, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan

autor

Phinney D. A.

• Bigelow Laboratory for Ocean Sciences, 180 McKown Point Road, P.O. Box 475, West Boothbay Harbor, ME 04575, USA

autor

Raine R.

• Martin Ryan Marine Science Institute, National University of Ireland, Galway, Ireland

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