2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/24/2021 | 8:30 AM - 10:30 AM | DISSOLVED ORGANIC CARBON CHEMOSTASIS IN ANTARCTIC POLAR DESERT STREAMS | Virtual Platform
DISSOLVED ORGANIC CARBON CHEMOSTASIS IN ANTARCTIC POLAR DESERT STREAMS
In the McMurdo Dry Valleys [MDV], Antarctica, little is known about concentration-discharge (C-q) relationships for biological solutes like DOC. Because MDV streams are low in organic carbon and experience large diel fluctuations in discharge(q), we expected that the MDV DOC-q relationship would be dilution-based and limited by the DOC generation rate, not the fluid transit time. To evaluate the DOC-q relationship in these glacial-meltwater streams, we fit the long-term DOC-q data to two models: a power law and an advection-reaction model. We then used model outputs and other common metrics to quantify the DOC-q relationship. Surprisingly, our results demonstrate this relationship is chemostatic; however, they do not provide a clear explanation why. After examining and eliminating various potential DOC-q drivers, we propose a conceptual model where hyporheic carbon storage, hyporheic exchange rates, and net DOC generation rates are key interacting components that enable chemostatic DOC-q behavior in MDV streams. This model clarifies the role of autochthonous carbon stores in maintaining DOC-q chemostasis and may be useful for examining these relationships in temperate systems, where the role of autochthonous carbon is masked by a far larger allochthonous signal.
- Ecosystem Dynamics
- Carbon cycle
- Biogeochemistry
Presentation:
This presentation has not yet been uploaded.
Handouts:
Handout is not Available
Transcripts:
CART transcripts are NOT YET available, but will be posted shortly after the conference
Presenters/Authors
Christa Torrens
(), University of Colorado at Boulder, christa.torrens@colorado.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Michael Gooseff
(), University of Colorado, michael.gooseff@colorado.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -
Diane McKnight
(), University of Colorado, diane.mcknight@colorado.edu;
ASHA DISCLOSURE:
Financial -
Nonfinancial -