Air - water temperature relationships in the trout streams of southeastern Minnesota’s carbonate - sandstone landscape

Journal of the American Water Resources Association
By: , and 

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Abstract

Carbonate-sandstone geology in southeastern Minnesota creates a heterogeneous landscape of springs, seeps, and sinkholes that supply groundwater into streams. Air temperatures are effective predictors of water temperature in surface-water dominated streams. However, no published work investigates the relationship between air and water temperatures in groundwater-fed streams (GWFS) across watersheds. We used simple linear regressions to examine weekly air-water temperature relationships for 40 GWFS in southeastern Minnesota. A 40-stream, composite linear regression model has a slope of 0.38, an intercept of 6.63, and R2 of 0.83. The regression models for GWFS have lower slopes and higher intercepts in comparison to surface-water dominated streams. Regression models for streams with high R2 values offer promise for use as predictive tools for future climate conditions. Climate change is expected to alter the thermal regime of groundwater-fed systems, but will do so at a slower rate than surface-water dominated systems. A regression model of intercept vs. slope can be used to identify streams for which water temperatures are more meteorologically than groundwater controlled, and thus more vulnerable to climate change. Such relationships can be used to guide restoration vs. management strategies to protect trout streams.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Air - water temperature relationships in the trout streams of southeastern Minnesota’s carbonate - sandstone landscape
Series title Journal of the American Water Resources Association
DOI 10.1111/jawr.12046
Volume 49
Issue 4
Year Published 2013
Language English
Publisher Wiley
Contributing office(s) Coop Res Unit Leetown
Description 12 p.
First page 896
Last page 907
Country United States
State Minnesota
Online Only (Y/N) N
Additional Online Files (Y/N) N