2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/24/2021 | 8:30 AM - 10:30 AM | CONTRIBUTION OF SMALL RESERVOIRS TO GREENHOUSE GAS EMISSIONS IN BRAZIL’S AMAZON-CERRADO AGRICULTURAL FRONTIER | Virtual Platform
CONTRIBUTION OF SMALL RESERVOIRS TO GREENHOUSE GAS EMISSIONS IN BRAZIL’S AMAZON-CERRADO AGRICULTURAL FRONTIER
Damming tropical streams has created hundreds of thousands of small reservoirs across Brazil’s agricultural frontier, a legacy of the country’s long history of cattle ranching. The low-oxygen conditions typical of these artificial wetlands favors methane production, yet we know little about their cumulative contribution to the global carbon budget. This study combines field measurements, remote sensing, and gas transfer modeling to quantify annual methane and carbon dioxide emissions from reservoirs in the Amazon-Cerrado region. Monthly field measurements from six representative reservoirs indicate strong seasonality, with the highest diffusive fluxes (~50 mg-C/m^2/d) observed at the onset of the rainy season and the lowest (~4 mg-C/m^2/d) at the peak of the dry season. Methane fluxes (per unit area) were inversely correlated with reservoir size, which ranged from 0.5-6 ha. Ebullitive fluxes dominated (63%) net emissions from large reservoirs, whereas outlet degassing (94%) dominated in small reservoirs. Preliminary maps based on Sentinel 1 and 2 data identified over 600,000 such reservoirs across the Amazon-Cerrado agricultural frontier – suggesting that they may be an important blind spot in our understanding of greenhouse gas contributions from inland waters in tropical regions.
- Tropical streams and lakes
- Land use
- Connectivity
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Presenters/Authors
Marcia Macedo
(), Woodwell Climate Research Center, mmacedo@woodwellclimate.org;
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Sarah Ludwig
(), Columbia University, sml2278@columbia.edu;
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Kathleen Savage
(), Woodwell Climate Research Center, savage@woodwellclimate.org;
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KathiJo Jankowski
(), U.S. Geological Survey, Upper Midwest Environmental Sciences Center, kjankowski@usgs.gov ;
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Kylen Solvik
(), University of Colorado at Boulder, Kylen.Solvik@colorado.edu;
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Paul Lefebvre
(), Woodwell Climate Research Center, paul@woodwellclimate.org;
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Leonardo Maracahipes-Santos
(), Instituto de Pesquisa Ambiental da Amazônia, leonardo.maracahipes@ipam.org.br;
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João Vitor Silva Costa
(), Universidade Federal de Goiás, joaovsc17@gmail.com;
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Ayanna Butler-Hooker
(), Howard University, ayanna421.ab@gmail.com;
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