2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

<< BACK TO AGENDA

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

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

Adrianne Smits (), University of California, Davis, asmits@ucdavis.edu;


ASHA DISCLOSURE:

Financial -

Nonfinancial -

Claire Ruffing (), University of British Columbia, ruffing.cathcart@ubc.ca;


ASHA DISCLOSURE:

Financial -

Nonfinancial -

Todd V. Royer (), Indiana University Bloomington, troyer@indiana.edu;


ASHA DISCLOSURE:

Financial -

Nonfinancial -

Alison Appling (), US Geological Survey, alison.appling@gmail.com;


ASHA DISCLOSURE:

Financial -

Nonfinancial -

Natalie Griffiths (), Oak Ridge National Laboratory, griffithsna@ornl.gov;


ASHA DISCLOSURE:

Financial -

Nonfinancial -

Rebecca Bellmore (), Southeast Alaska Watershed Coalition, rebecca@sawcak.org;


ASHA DISCLOSURE:

Financial -

Nonfinancial -

Mark Scheuerell (), University of Washington , scheuerl@uw.edu;


ASHA DISCLOSURE:

Financial -

Nonfinancial -

Tamara Harms (), University of Alaska Fairbanks, tamara.harms@alaska.edu;


ASHA DISCLOSURE:

Financial -

Nonfinancial -

Jeremy Jones (), University of Alaska Fairbanks, jbjonesjr@alaska.edu;


ASHA DISCLOSURE:

Financial -

Nonfinancial -