2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/08/2017 | 9:30 AM - 9:45 AM | CLIMATE DRIVERS OF VARIABILITY AND SYNCHRONY IN DISCHARGE AND NUTRIENT LOADS IN THE MISSISSIPPI BASIN | 302B
CLIMATE DRIVERS OF VARIABILITY AND SYNCHRONY IN DISCHARGE AND NUTRIENT LOADS IN THE MISSISSIPPI BASIN
Agriculture in the Mississippi Basin contributes to nutrient loading to the Gulf of Mexico. However, climatic fluctuations result in annual variability in nutrient loads to the Gulf. Climate phenomena such as El-Niño Southern Oscillation (ENSO) influence regional precipitation and temperature and may drive synchrony in streamflow, but climate-driven effects on solute export from the Mississippi Basin are poorly understood. Here, we investigate how large-scale climactic patterns (ENSO, North Atlantic Oscillation (NAO), Northern Hemisphere Land-Surface Air Temperature Anomaly (SAT)) influence N, P, and Si loads from four large Mississippi sub-basins: the Upper Mississippi, Ohio-Tennessee, Missouri, and Arkansas-Red. We fit multivariate autoregressive state-space models to USGS estimated solute loads from these four basins (1979 – 2014) to investigate how climate affects temporal and spatial variation in solute load dynamics. Discharge and solute loads in the Upper Mississippi and Missouri displayed synchronous dynamics ( delta AICc > 2 for all solutes), whereas the Ohio-Tennessee and Arkansas-Red were independent. Climate indices (ENSO, SAT, NAO) had significant effects on discharge and solute loads, and the magnitude and direction of these effects varied by solute and region.
- C06 Large River Ecology
- C10 Biogeochemistry
- S24 Towards a predictive freshwater ecology: using time-series data to understand and forecast responses to a changing environment
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Presenters/Authors
Adrianne Smits
(), University of California, Davis, asmits@ucdavis.edu;
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Claire Ruffing
(), University of British Columbia, ruffing.cathcart@ubc.ca;
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Todd V. Royer
(), Indiana University Bloomington, troyer@indiana.edu;
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Alison Appling
(), US Geological Survey, alison.appling@gmail.com;
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Natalie Griffiths
(), Oak Ridge National Laboratory, griffithsna@ornl.gov;
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Rebecca Bellmore
(), Southeast Alaska Watershed Coalition, rebecca@sawcak.org;
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Mark Scheuerell
(), University of Washington , scheuerl@uw.edu;
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Tamara Harms
(), University of Alaska Fairbanks, tamara.harms@alaska.edu;
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Jeremy Jones
(), University of Alaska Fairbanks, jbjonesjr@alaska.edu;
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