EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/25/2021 | 8:30 AM - 10:30 AM | Spectroscopic time series from continental network of in situ sensors indicate water clarity influences organic matter processing rates | Virtual Platform
Spectroscopic time series from continental network of in situ sensors indicate water clarity influences organic matter processing rates
High frequency spectroscopy measurements in freshwaters hold promise for estimating organic matter processing rates in situ. However, difficulties correcting and interpreting spectroscopy data have limited application of this tool. We leveraged a network spanning the United States—including National Ecological Observatory Network (NEON) sites—of in situ sensors measuring ultraviolet-visible (UV-Vis) absorbance (collected with SUNA sondes) to interpret freshwater optical spectroscopy time series. We predicted that diel changes to high frequency UV-Vis absorbance spectra can be used to measure transformation and production of DOM. For example, we expected that streams with high aromatic DOM levels and low canopy cover would exhibit changes to UV-Vis absorbance spectra around solar noon indicative of DOM photo-oxidation. Where water clarity was high (low turbidity and aromatic DOM) and canopy cover was low, we predicted certain fractions of DOM would increase throughout the day, indicative of photosynthetic DOM production. After applying a revised temperature correction to UV-Vis and fDOM time series, we found that diel signals were correlated to insolation, turbidity, canopy cover, and fDOM levels. Using this analysis, we estimate that photosynthesis exceeds photo-oxidation in most lakes, streams, and rivers studied.
- Carbon cycle
- Nutrient cycling
- Big data
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Presenters/Authors
Jacob Hosen
(), Purdue University, jhosen@purdue.edu;
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Joanna Blaszczak
(), Global Water Center and Department of Natural Resources and Environmental Science, University of Nevada, Reno, jblaszczak@unr.edu;
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Matthew Cohen
(), University of Florida, mjc@ufl.edu;
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Robert Hensley
(), Battelle, National Ecological Observatory Network , hensley@battelleecology.org;
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Kelly Hondula
(), National Environmental Observation Network, khondula@sesync.org;
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William H. McDowell
(), University of New Hampshire, bill.mcdowell@unh.edu;
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Jody Potter
(), University of New Hampshire, jody.potter@unh.edu;
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Peter Raymond
(), Yale University, peter.raymond@yale.edu;
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Kevin Ryan
(), Northeastern University, ryan.kevi@northeastern.edu;
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Bryan Yoon
(), Northeastern University, b.yoon@northeastern.edu;
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