2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/21/2019 | 2:30 PM - 2:45 PM | HIGH-RESOLUTION SPATIO-TEMPORAL DOM DYNAMICS IN WHITE CLAY CREEK, PENNSYLVANIA | 250 AB
HIGH-RESOLUTION SPATIO-TEMPORAL DOM DYNAMICS IN WHITE CLAY CREEK, PENNSYLVANIA
Chromophoric dissolved organic matter (CDOM) is the fraction of DOM that absorbs light in the ultraviolet-visible spectral region. In the last decades, several absorbance-based metrics have been developed to help quantify dissolved organic carbon (DOC) concentrations, characterize the complex chemical character of DOM, and identify DOM sources and processing in the environment. Using in situ spectrophotometers to measure high-frequency absorbance spectra, we evaluated how DOM dynamics reflected watershed and reach-scale biogeochemical processes in White Clay Creek, a temperate third-order stream in Pennsylvania, USA. In January 2018, three field spectrophotometers (s::can®) were deployed ~1 km apart, and set to collect data at 5-15 minute intervals. Preliminary results of specific UV absorbance (a proxy for aromaticity) and spectral slope (a proxy for molecular weight and photodegradation) showed variation in DOM quality at small spatial (<1 km reaches) and temporal (diurnal, storm event) scales. These appear related to DOM source and transformation during transport, likely through photodegradation. While in situ, high-frequency measurements yielded new insights into stream DOM dynamics, the application of this technology requires several logistical and technical considerations related to power supply, chemical and biological fouling, and data management.
- Biogeochemistry
- Organic Matter
- Light
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Presenters/Authors
Diana Oviedo Vargas
(), Stroud Water Research Center, doviedo@stroudcenter.org;
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Nonfinancial -