2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/22/2018 | 9:15 AM - 9:30 AM | GREENHOUSE GAS FLUXES FROM AQUATIC ECOSYSTEMS ALONG A RURAL TO URBAN GRADIENT ARE DRIVEN BY N LOADING | 330 B
GREENHOUSE GAS FLUXES FROM AQUATIC ECOSYSTEMS ALONG A RURAL TO URBAN GRADIENT ARE DRIVEN BY N LOADING
The effects of urbanization on net greenhouse gas (GHG) exchange from streams and rivers to the atmosphere is poorly understood. Here we examine 4 years of weekly samples in multiple headwater streams and a downstream main stem site in New Hampshire. Our results show that within a single drainage network, CH4 concentrations are higher downstream than the headwaters, which span a range of land use and wetland coverage. Methane is also very strongly seasonal in concentration in the tributaries (peaking in late summer), but is aseasonal in the main stem. In contrast, N2O concentrations are strongly seasonal at all sites, but peak in early winter and are much higher in more urban tributaries than the main stem. Urbanization results in a flipping of GHG concentrations, with highest N2O and lowest CH4 in the most urban watershed. CO2 shows no strong patterns with respect to landscape position, urbanization, or season. We examined multiple biogeochemical drivers of net CH4 and N2O production, and found that the increased NO3 concentration associated with urbanization is a good predictor of N2O concentrations and NH4:NO3 is a good predictor of CH4 concentrations.
- Biogeochemistry
- Urban
- Climate Change
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Presenters/Authors
Jody Potter
(), University of New Hampshire, jody.potter@unh.edu;
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Adam Wymore
(), University of New Hampshire, adam.wymore@unh.edu;
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William H. McDowell
(), University of New Hampshire, bill.mcdowell@unh.edu;
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