Optical properties of chromophoric dissolved organic matter (CDOM) in surface and pore waters adjacent to an oil well in a southern California salt marsh

Chromophoric dissolved organic matter (CDOM) optical properties were measured in surface and pore waters as a function of depth and distance from an oil well in a southern California salt marsh. Higher fluorescence and absorbances in pore vs. surface waters suggest soil pore water is a reservoir of...

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Veröffentlicht in:Marine pollution bulletin 2017-01, Vol.114 (1), p.157-168
Hauptverfasser: Bowen, Jennifer C., Clark, Catherine D., Keller, Jason K., De Bruyn, Warren J.
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Keller, Jason K.
De Bruyn, Warren J.
description Chromophoric dissolved organic matter (CDOM) optical properties were measured in surface and pore waters as a function of depth and distance from an oil well in a southern California salt marsh. Higher fluorescence and absorbances in pore vs. surface waters suggest soil pore water is a reservoir of CDOM in the marsh. Protein-like fluorophores in pore waters at distinct depths corresponded to variations in sulfate depletion and Fe(II) concentrations from anaerobic microbial activity. These variations were supported by fluorescence indexes and are consistent with differences in optical molecular weight and aromaticity indicators. Fluorescence indices were consistent with autochthonous material of aquatic origin in surface waters, with more terrestrial, humified allochthonous material in deeper pore waters. CDOM optical properties were consistent with significantly enhanced microbial activity in regions closest to the oil well, along with a three-dimensional excitation/emission matrix fluorescence spectrum peak attributable to oil, suggesting anaerobic microbial degradation of oil. •Autochthonous material of aquatic origin in salt marsh surface waters•More terrestrial, humified allochthonous material in pore waters•Variations in optical properties, sulfate and Fe(II) in bands at depth•Enhanced microbial activity close to oil well, with oil optical signature
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source MEDLINE; Elsevier ScienceDirect Journals
subjects California
CDOM
EEMS
Environmental Monitoring
Fluorescence
Marine
Oil
Oil and Gas Fields
Optical properties
Organic Chemicals - chemistry
Salt marsh
Sodium Chloride
Spectrometry, Fluorescence - methods
Water
Water Pollutants, Chemical - analysis
Water Pollutants, Chemical - chemistry
Wetlands
title Optical properties of chromophoric dissolved organic matter (CDOM) in surface and pore waters adjacent to an oil well in a southern California salt marsh
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