EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/24/2021 | 8:30 AM - 10:30 AM | GREENHOUSE GAS EMISSIONS FROM HIGHLY CONTRASTING STREAMS IN THE TRANSITIONAL TROPICAL DRY FOREST, MARITZA BIOLOGICAL STATION, COSTA RICA. | Virtual Platform
GREENHOUSE GAS EMISSIONS FROM HIGHLY CONTRASTING STREAMS IN THE TRANSITIONAL TROPICAL DRY FOREST, MARITZA BIOLOGICAL STATION, COSTA RICA.
Contributions of greenhouse gases from tropical headwaters to the global carbon cycle are underrepresented. We measured carbon dioxide (CO2) and methane (CH4) emissions from Marilín and Yegüitas, two headwater streams in the transitional dry forest of Costa Rica. For this, we collected water samples for analysis of CO2 and CH4 concentrations and conducted continuous solute and gas tracer injections in 100-m study reaches to determine discharge (Q) and gas exchange rates (K). Only a few kilometers apart, but on different sides of the continental divide, Marilín is perennial and wetter than Yegüitas, which is intermittent. Average CH4 concentration was similar at both sites (~550ppm), whereas average CO2 was much higher at Yegüitas (~16,800ppm) than at Marilín (~5,600ppm). At Marilín (Q =10L/s, travel time, tt = 40min), emissions averaged 915 µmolCO2/m2/day and 2 µmolCH4/m2/day; comparable to values reported for other tropical headwaters. We were not able to determine K at Yegüitas because of an unexpected long tt (~5hr), which was likely due to a high subsurface transient storage and significant subsurface flow. Traditional gas tracer methods to measure K in small streams are not appropriate for these hydrologic conditions.
- Carbon cycle
- Tropical streams and lakes
- Biogeochemistry
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Presenters/Authors
Diana Oviedo Vargas
(), Stroud Water Research Center, doviedo@stroudcenter.org;
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Melinda Daniels
(), Stroud Water Research Center, mdaniels@stroudcenter.org;
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Marc Peipoch
(), Stroud Water Research Center, mpeipoch@stroudcenter.org;
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