Inicio  /  Water  /  Vol: 8 Núm: 1 Par: 2 (2016)  /  Artículo
ARTÍCULO
TITULO

CO2 is Dominant Greenhouse Gas Emitted from Six Hydropower Reservoirs in Southeastern United States during Peak Summer Emissions

Mark S. Bevelhimer    
Arthur J. Stewart    
Allison M. Fortner    
Jana R. Phillips    
Jennifer J. Mosher    

Resumen

During August?September 2012, we sampled six hydropower reservoirs in southeastern United States for CO2 and CH4 emissions via three pathways: diffusive emissions from water surface; ebullition in the water column; and losses from dam tailwaters during power generation. Estimates of average areal emission rates of CO2 attributable to the six reservoirs (i.e., reservoir plus tailwater emissions) ranged from 994 to 2760 mg·m-2·day-1, which is low to moderate compared to CO2 emissions rates reported for tropical hydropower reservoirs and boreal ponds and lakes, and similar to rates reported for other temperate reservoirs. Similar average rates for CH4 were also relatively low, ranging from 6 to 187 mg·m-2·day-1. On a whole-reservoir basis, estimates of total emissions of CO2 ranged 10-fold, from 42,740 kg per day for Fontana to 501,151 kg per day for Guntersville, and total emissions of CH4 ranged over 30-fold, from 251 kg per day for Fontana to 9153 kg per day for Allatoona. Emissions through the tailwater pathway varied among reservoirs, comprising from 19% to 65% of total CO2 emissions and 0% to 84% of CH4 emissions, depending on the reservoir. Emission rates were significantly correlated with several reservoir morphological and water quality characteristics, including metrics related to vertical stratification (e.g., minimum water column temperature and maximum dissolved oxygen) and reservoir productivity (e.g., water transparency and chlorophyll a concentration).

 Artículos similares

       
 
Michele Mutchek, Gregory Cooney, Gavin Pickenpaugh, Joe Marriott and Timothy Skone    
The construction of two marine bulk terminals in the Pacific Northwest region of the United States are currently under review and would open up additional thermal coal exports to Asia on the order of almost 100 million additional tonnes per year. The maj... ver más
Revista: Energies

 
Marlia M. Hanafiah, Mark A.J. Huijbregts and A. Jan Hendriks    
The ecological footprint (EF) commonly neglects the influence of other stressors than land use and CO2 emissions on the land area required for human activities. This study analyzes the relevancy of including nutrients and non-CO2 gr... ver más
Revista: Sustainability