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Water 2017, 9(2), 118; doi:10.3390/w9020118

Climate Change Impacts on US Water Quality Using Two Models: HAWQS and US Basins

1
Industrial Economics, Inc., Cambridge, MA 02140, USA
2
Department of Ecosystem Science and Management and Biological and Agricultural Engineering, Texas A&M University, College Station, TX 77843, USA
3
Joint Program on the Science and Policy of Global Change, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
4
Civil and Environmental Engineering, Tufts University, Medford, MA 02155, USA
5
U.S. Environmental Protection Agency (EPA), Washington, DC 20460, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Lei Chen
Received: 22 November 2016 / Revised: 1 February 2017 / Accepted: 7 February 2017 / Published: 14 February 2017
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Abstract

Climate change and freshwater quality are well-linked. Changes in climate result in changes in streamflow and rising water temperatures, which impact biochemical reaction rates and increase stratification in lakes and reservoirs. Using two water quality modeling systems (the Hydrologic and Water Quality System; HAWQS and US Basins), five climate models, and two greenhouse gas (GHG) mitigation policies, we assess future water quality in the continental U.S. to 2100 considering four water quality parameters: water temperature, dissolved oxygen, total nitrogen, and total phosphorus. Once these parameters are aggregated into a water quality index, we find that, while the water quality models differ under the baseline, there is more agreement between future projections. In addition, we find that the difference in national-scale economic benefits across climate models is generally larger than the difference between the two water quality models. Both water quality models find that water quality will more likely worsen in the East than in the West. Under the business-as-usual emissions scenario, we find that climate change is likely to cause economic impacts ranging from 1.2 to 2.3 (2005 billion USD/year) in 2050 and 2.7 to 4.8 in 2090 across all climate and water quality models. View Full-Text
Keywords: water quality; climate change; economic valuation; mitigation; greenhouse gases; model comparison water quality; climate change; economic valuation; mitigation; greenhouse gases; model comparison
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Fant, C.; Srinivasan, R.; Boehlert, B.; Rennels, L.; Chapra, S.C.; Strzepek, K.M.; Corona, J.; Allen, A.; Martinich, J. Climate Change Impacts on US Water Quality Using Two Models: HAWQS and US Basins. Water 2017, 9, 118.

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