Abstract
Abstract. Anthropogenic activity has led to significant emissions of greenhouse gas (GHG), which is thought to play important roles in global climate changes. It remains unclear about the kinetics of GHG emissions, including carbon dioxide (CO2), methane (CH4) and nitrous Oxide (N2O) from the Three Gorges Reservoir (TGR) of China, which was formed after the construction of the famous Three Gorges Dam. Here we report monthly measurements for one year of the fluxes of these gases at multiple sites within the TGR region, including three major tributaries, six mainstream sites, two downstream sites and one upstream site. The tributary areas have lower CO2 fluxes than the main storage; CH4 fluxes in the tributaries and upper reach mainstream sites are relative higher. Overall, TGR showed significantly lower CH4 emission rates than most new reservoirs in temperate and tropical regions. We attribute this to the well-oxygenated deep water and high water velocities that may facilitate the consumption of CH4. TGR's CO2 fluxes were lower than most tropical reservoirs and higher than most temperate systems. This could be explained by the high load of labile soil carbon delivered through erosion to the Yangtze River. Compared to fossil-fuelled power plants of equivalent power output, TGR is a very small GHG emitter – annual CO2-equivalent emissions are approximately 1.7% of that of a coal-fired generating plant of comparable power output.
Highlights
Introduction turnoverFor example, Three Gorges Reservoir (TGR) occupies a steep-sided gorge rather than a relatively shallow basin characteristic of theThe Three Gorges Dam, regarded as one of the world’s largest hydropower dams, has been operating at full capacity since the end of 2008
The present study has shown that the TGR is generally a source of atmospheric greenhouse gas (GHG)
This study has explored the spatial–temporal patterns of GHG fluxes at TGR
Summary
Introduction turnoverFor example, TGR occupies a steep-sided gorge rather than a relatively shallow basin characteristic of theThe Three Gorges Dam, regarded as one of the world’s largest hydropower dams, has been operating at full capacity since the end of 2008. The amount of organic matter that is the main precursor for GHG generation through microbial metabolisms is low. Y. Zhao et al.: Spatial and temporal patterns of GHG emissions the fact that 1.2 million habitants in the small and narrow riverine floodplain were relocated and much of the vegetation and organic materials removed before the zone was flooded (Zhang and Lou, 2011). Zhao et al.: Spatial and temporal patterns of GHG emissions the fact that 1.2 million habitants in the small and narrow riverine floodplain were relocated and much of the vegetation and organic materials removed before the zone was flooded (Zhang and Lou, 2011) This situation is distinctly different from the Brazilian reservoirs where organic-matter-rich rainforests were inundated. Surface plant biomass boosts initial CO2 emissions in boreal reservoirs, whereas it is driven by sediment and pelagic respiration in the long term (Teodoru et al, 2011)
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