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Optical properties of dissolved organic matter (DOM): Effects of biological and photolytic degradation

Limnology and oceanography, 2016-05, Vol.61 (3), p.1015-1032 [Peer Reviewed Journal]

Published 2016. This article is a U.S. Government work and is in the public domain in the USA. Limnology and Oceanography published by Wiley Periodicals, Inc. on behalf of Association for the Sciences of Limnology and Oceanography ;ISSN: 0024-3590 ;EISSN: 1939-5590 ;DOI: 10.1002/lno.10270

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  • Title:
    Optical properties of dissolved organic matter (DOM): Effects of biological and photolytic degradation
  • Author: Hansen, Angela M. ; Kraus, Tamara E. C. ; Pellerin, Brian A. ; Fleck, Jacob A. ; Downing, Bryan D. ; Bergamaschi, Brian A.
  • Subjects: Marine
  • Is Part Of: Limnology and oceanography, 2016-05, Vol.61 (3), p.1015-1032
  • Description: Advances in spectroscopic techniques have led to an increase in the use of optical properties (absorbance and fluorescence) to assess dissolved organic matter (DOM) composition and infer sources and processing. However, little information is available to assess the impact of biological and photolytic processing on the optical properties of original DOM source materials. Over a 3.5 month laboratory study, we measured changes in commonly used optical properties and indices in DOM leached from peat soil, plants, and algae following biological and photochemical degradation to determine whether they provide unique signatures that can be linked to original DOM source. Changes in individual optical parameters varied by source material and process, with biodegradation and photodegradation often causing values to shift in opposite directions. Although values for different source materials frequently overlapped, multivariate statistical analyses showed that unique optical signatures could be linked to original DOM source material, with 17 optical properties determined by discriminant analysis to be significant (p < 0.05) in distinguishing between DOM source and environmental processing. These results demonstrate that inferring source material from optical properties is possible when parameters are evaluated in combination even after extensive biological and photochemical alteration.
  • Publisher: Blackwell Publishing Ltd
  • Language: English
  • Identifier: ISSN: 0024-3590
    EISSN: 1939-5590
    DOI: 10.1002/lno.10270
  • Source: Alma/SFX Local Collection
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