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

Schwarz, Jill and Kowalczuk, Piotr and Kaczmarek, Slawek and Cota, G. and Mitchell, B. G. and Kahru, M. and Chavez, F. and Cunningham, Alex and McKee, David and Gege, Peter and Kishino, M. and Phinney, D. and Raine, Robin (2002) Two models for absorption by coloured dissolved organic matter (CDOM). Oceanologia, 44 (2), pp. 209-241.

Full text not available from this repository.

Abstract

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 400 nm (s440) ranged between < 0.01 and 0.04 nm-1. No relationship was found between ag 440 or s440 and salinity. Except in the southern Baltic, s440 was found to have a broad distribution (0.0165 +- 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.

Item URL in elib:https://elib.dlr.de/7953/
Document Type:Article
Additional Information: LIDO-Berichtsjahr=2002,
Title:Two models for absorption by coloured dissolved organic matter (CDOM)
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schwarz, JillUNSPECIFIEDUNSPECIFIED
Kowalczuk, PiotrIOPAS, SopotUNSPECIFIED
Kaczmarek, SlawekIOPAS, SopotUNSPECIFIED
Cota, G.ODUUNSPECIFIED
Mitchell, B. G.SIOUNSPECIFIED
Kahru, M.SIOUNSPECIFIED
Chavez, F.MBARIUNSPECIFIED
Cunningham, AlexUS, GlasgowUNSPECIFIED
McKee, DavidUS, GlasgowUNSPECIFIED
Gege, PeterUNSPECIFIEDUNSPECIFIED
Kishino, M.IPCRUNSPECIFIED
Phinney, D.BLOSUNSPECIFIED
Raine, RobinNUI, IrelandUNSPECIFIED
Date:2002
Journal or Publication Title:Oceanologia
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:44
Page Range:pp. 209-241
Status:Published
Keywords:CDOM, Gelbstoff, Ocean colour, UV absorption
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Entwicklung und Erprobung von Verfahren zur Gewässerfernerkundung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute
Deposited By: DLR-Beauftragter, elib
Deposited On:23 Feb 2006
Last Modified:06 Jan 2010 22:10

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