2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/24/2021 | 8:30 AM - 10:30 AM | Greenhouse Gas Emission from Tropical Reservoirs: Spatial and Temporal Dynamics | Virtual Platform

Greenhouse Gas Emission from Tropical Reservoirs: Spatial and Temporal Dynamics

Methane (CH4) and carbon dioxide (CO2) emissions from reservoirs make up for 1.3% of the global anthropogenic greenhouse gas emission, and reservoir emissions are expected to increase with climate change. We present here the results from three years of extensive field studies in four Brazilian reservoirs, aiming to identify spatio-temporal patterns and drivers of CH4 and CO2 emissions from reservoir water surfaces, for robust future emission estimates. We found that CH4 and CO2 emissions varied greatly at different timescales. Seasonal variability was identified as the most important temporal scale to be covered for ebullition inventories. Patterns of spatial variability in diffusive emission differed between seasons, and overall, spatial variability was large for all pathways. For both ebullition and diffusion, river inflow areas were prone to elevated greenhouse gas emission, and the most productive reservoir was highest in total CO2-equivalent emission. We suggest that for retrieving solid emission estimates from tropical reservoirs, there is no alternative to time-consuming measurements in the field. Measurements should be repeated at least once during each hydrological season and cover different morphological regions at high resolution, including areas with and without river inflows, and different water column depths.

Tropical streams and lakes
Tropical
Biogeochemistry

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Presenters/Authors

Annika Linkhorst (), Uppsala University, liannika@alumni.ethz.ch;