Document Detail


Evaluation of two current approaches for the measurement of carbon dioxide diffusive fluxes from lentic ecosystems.
MedLine Citation:
PMID:  18497151     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The dry ice sowing experiment (DISE) consisted in adding dry ice to a lake and monitoring the subsequent evasion of carbon dioxide (CO2). DISE allowed us to evaluate two approaches commonly used for measuring aquatic CO2 diffusive fluxes: the boundary layer equation (BLE) from Cole and Caraco (1998) and a particular model of static chamber (SC). CO2 evasion measurements with both approaches were compared to CO2 mass budgets as a relative reference to define their recovery coefficients (p). p for the BLE and the SC over the whole measurement period were 101 +/- 14% and 115 +/- 56%, respectively. Results from discrete sampling intervals revealed that the BLE generally provided estimations in good agreement (80-130%) with the mass budgets during both daytime and nighttime. Variations in p for the BLE were related to wind speed and, consequently, piston velocity (k600). The SC overestimated CO2 evasion during daytime (149 +/- 39%), and underestimated it during nighttime (57 +/- 18%). Variations in p for the SC were related to k600, stemming mainly from the alteration of the air/ water temperature gradient.
Authors:
Nicolas Soumis; René Canuel; Marc Lucotte
Publication Detail:
Type:  Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental science & technology     Volume:  42     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2008 Apr 
Date Detail:
Created Date:  2008-05-23     Completed Date:  2008-07-25     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2964-9     Citation Subset:  IM    
Affiliation:
GEOTOP/Institut des sciences de l'environnement, Université du Québec a Montréal, C.P. 8 888, Succ. Centre-Ville, Montréal, Québec, Canada H3C 3P8. nicolas.soumis@internet.uqam.ca
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MeSH Terms
Descriptor/Qualifier:
Carbon Dioxide / analysis*
Dry Ice
Ecosystem
Environmental Monitoring / methods*
Fresh Water
Chemical
Reg. No./Substance:
0/Dry Ice; 124-38-9/Carbon Dioxide

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