Ecosystem processes and human influences regulate streamflow response to climate change at long-term ecological research sites

  • Authors: Jones, Julia A.; Creed, Irena F.; Hatcher, Kendra L.; Warren, Robert J.; Adams, Mary Beth; Benson, Melinda H.; Boose, Emery; Brown, Warren A.; Campbell, John L.; Covich, Alan; Clow, David W.; Dahm, Clifford N.; Elder, Kelly; Ford, Chelcy R.; Grimm, Nancy B.; Henshaw, Donald L; Larson, Kelli L.; Miles, Evan S.; Miles, Kathleen M.; Sebestyen, Stephen D.; Spargo, Adam T.; Stone, Asa B.; Vose, James M.; Williams, Mark W.
  • Publication Year: 2012
  • Publication Series: Scientific Journal (JRNL)
  • Source: BioScience. 62(4): 390-404.
  • DOI: 10.1525/bio.2012.62.4.10

Abstract

Analyses of long-term records at 35 headwater basins in the United States and Canada indicate that climate change effects on streamflow are not as clear as might be expected, perhaps because of ecosystem processes and human influences. Evapotranspiration was higher than was predicted by temperature in water-surplus ecosystems and lower than was predicted in water-deficit ecosystems. Streamflow was correlated with climate variability indices (e.g., the El Niño-Southern Oscillation, the Pacific Decadal Oscillation, the North Atlantic Oscillation), especially in seasons when vegetation influences are limited. Air temperature increased significantly at 17 of the 19 sites with 20- to 60-year records, but streamflow trends were directly related to climate trends (through changes in ice and snow) at only 7 sites. Past and present human and natural disturbance, vegetation succession, and human water use can mimic, exacerbate, counteract, or mask the effects of climate change on streamflow, even in reference basins. Long-term ecological research sites are ideal places to disentangle these processes.

  • Citation: Jones, Julia A.; Creed, Irena F.; Hatcher, Kendra L.; Warren, Robert J.; Adams, Mary Beth; Benson, Melinda H.; Boose, Emery; Brown, Warren A.; Campbell, John L.; Covich, Alan; Clow, David W.; Dahm, Clifford N.; Elder, Kelly; Ford, Chelcy R.; Grimm, Nancy B.; Henshaw, Donald L; Larson, Kelli L.; Miles, Evan S.; Miles, Kathleen M.; Sebestyen, Stephen D.; Spargo, Adam T.; Stone, Asa B.; Vose, James M.; Williams, Mark W. 2012. Ecosystem processes and human influences regulate streamflow response to climate change at long-term ecological research sites. BioScience. 62(4): 390-404.
  • Keywords: precipitation/runoff ratio, trend, succession, socioecological systems, Budyko curve
  • Posted Date: April 12, 2012
  • Modified Date: January 4, 2013
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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
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