Document Detail


Biogeochemical controls on Diel cycling of stable isotopes of dissolved O2 and dissolved inorganic carbon in the Big Hole River, Montana.
MedLine Citation:
PMID:  16201639     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Rivers with high biological productivity typically show substantial increases in pH and dissolved oxygen (DO) concentration during the day and decreases at night, in response to changes in the relative rates of aquatic photosynthesis and respiration. These changes, coupled with temperature variations, may impart diel (24-h) fluctuations in the concentration of trace metals, nutrients, and other chemical species. A better understanding of diel processes in rivers is needed and will lead to improved methods of data collection for both monitoring and research purposes. Previous studies have used stable isotopes of dissolved oxygen (DO) and dissolved inorganic carbon (DIC) as tracers of geochemical and biological processes in streams, lakes, and marine systems. Although seasonal variation in 6180 of DO in rivers and lakes has been documented, no study has investigated diel changes in this parameter. Here, we demonstrate large (up to 13%o) cycles in delta18O-DO for two late summer sampling periods in the Big Hole River of southwest Montana and illustrate that these changes are correlated to variations in the DO concentration, the C-isotopic composition of DIC, and the primary productivity of the system. The magnitude of the diel cycle in delta18O-DO was greater in August versus September because of the longer photoperiod and warmer water temperatures. This study provides another biogeochemical tool for investigating the O2 and C budgets in rivers and may also be applicable to lake and groundwater systems.
Authors:
Stephen R Parker; Simon R Poulson; Christopher H Gammons; Michael D DeGrandpre
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Environmental science & technology     Volume:  39     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2005 Sep 
Date Detail:
Created Date:  2005-10-05     Completed Date:  2005-12-12     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  7134-40     Citation Subset:  IM    
Affiliation:
Department of Chemistry and Geochemistry, Montana Tech of The University of Montana, Butte, Montana, USA. sparker@mtech.edu
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MeSH Terms
Descriptor/Qualifier:
Anions
Carbon / chemistry*
Carbon Compounds, Inorganic / analysis
Carbon Isotopes / analysis*
Carbonates / analysis
Chemistry / methods*
Environmental Monitoring / methods*
Geologic Sediments / analysis
Hydrogen-Ion Concentration
Isotopes / analysis*
Models, Chemical
Montana
Organic Chemicals / analysis
Oxygen / analysis,  chemistry*
Oxygen Consumption
Photosynthesis
Seasons
Temperature
Time Factors
Trace Elements
Water / analysis
Chemical
Reg. No./Substance:
0/Anions; 0/Carbon Compounds, Inorganic; 0/Carbon Isotopes; 0/Carbonates; 0/Isotopes; 0/Organic Chemicals; 0/Trace Elements; 7440-44-0/Carbon; 7732-18-5/Water; 7782-44-7/Oxygen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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