2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/05/2017 | 9:00 AM - 9:15 AM | USING SPATIAL VARIABILITY IN CARBON AND NUTRIENT CHEMISTRY TO IDENTIFY DRIVERS AND DETECT CHANGE IN ARCTIC WATERSHEDS | 302B
USING SPATIAL VARIABILITY IN CARBON AND NUTRIENT CHEMISTRY TO IDENTIFY DRIVERS AND DETECT CHANGE IN ARCTIC WATERSHEDS
Dissolved organic carbon (DOC) and nutrient concentrations are increasing in rivers across the Arctic. Two hypotheses have been proposed to explain these trends: 1. distributed, top-down permafrost degradation, and 2. discrete, point-source delivery of DOC and nutrients from permafrost collapse features. While long-term monitoring at a single station cannot discriminate between these mechanisms, synoptic sampling of multiple points in the stream network could reveal the spatial structure of solute sources. In this context, we sampled carbon and nutrient chemistry in 119 subcatchments of three distinct Arctic watersheds (North Slope, Alaska). Subcatchments ranged from 0.1 to 80 km2, and included mountainous, tundra, and glacial-lake landscapes. We found that variance in solute concentrations between subcatchments collapsed at spatial scales between 1 to 20 km2, indicating a continuum of diffuse- and point-source dynamics, depending on solute and watershed characteristics (e.g. topography, vegetation, surficial geology). Spatially-distributed mass balance revealed conservative transport of DOC and nitrogen, but strong in-stream retention of phosphorus. We present new approaches to analyzing synoptic data for change detection and quantification of ecohydrological mechanisms in ecosystems in the Arctic and beyond.
- C20 Climate Change
- C27 Landuse and Non-Point source Impacts
- C14 Hydroecology
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Presenters/Authors
Jay Zarnetske
(), Department of Earth and Environmental Sciences, Michigan State University, jpz@msu.edu;
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Benjamin Abbott
(), Department of Earth and Environmental Sciences, Michigan State University, USA, benabbo@gmail.com;
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William Breck Bowden
(), University of Vermont, breck.bowden@uvm.edu;
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Samuel P. Parker
(), University of Vermont, samuel.parker@uvm.edu;
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Frances Iannucci
(), University of Alaska Fairbanks, fiannucci@alaska.edu;
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Joshua Benes
(), University of Vermont, Joshua.Benes@uvm.edu;
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