2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2019 | 2:00 PM - 2:15 PM | SEASONAL DYNAMICS AND CONTROLS ON STREAM DOC TRANSPORT IN THE HIGH-CARBON REGION OF THE PACIFIC COASTAL TEMPERATURE RAINFOREST | 250 AB
SEASONAL DYNAMICS AND CONTROLS ON STREAM DOC TRANSPORT IN THE HIGH-CARBON REGION OF THE PACIFIC COASTAL TEMPERATURE RAINFOREST
Streams in British Columbia's humid, organic-rich Pacific Coastal Temperate Rainforest (PCTR) deliver globally significant yields of soil-derived dissolved organic carbon (DOC) to the ocean, which can affect ocean acidification, provide energy to coastal food webs, and off-gas to the atmosphere as CO2. We collected high-frequency data from automated, in-situ fDOM sensors for two years in four PCTR watershed outlets to determine seasonal controls on stream DOC in the PCTR, and to develop a model of subsurface DOC transport and hydrological connectivity. We corrected fDOM sensor output for temperature, turbidity, and inner filter effects to achieve reliable estimates of stream DOC (R2=0.47-0.89). Storm event DOC concentrations primarily exhibited dilution across all seasons with flushing at the end of the dry summer period and the beginning of the wet autumn period, and were significantly correlated with precipitation, 3-day pre-event soil moisture, and watershed area (p < 0.05, R2=0.22). Establishing seasonal controls on stream DOC transport in this high-carbon region has critical implications for coastal ecology and the global carbon cycle, and improves our ability to predict how these systems may be affected by environmental and climatic changes in the future.
- Carbon
- Biogeochemistry
- Organic Matter
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Presenters/Authors
Anna Bishop
(), University of Alberta, abishop@ualberta.ca;
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