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    Author(s): Julia A. Jones; Irena F. Creed; Kendra L. Hatcher; Robert J. Warren; Mary Beth Adams; Melinda H. Benson; Emery Boose; Warren A. Brown; John L. Campbell; Alan Covich; David W. Clow; Clifford N. Dahm; Kelly ElderChelcy R. Ford; Nancy B. Grimm; Donald L Henshaw; Kelli L. Larson; Evan S. Miles; Kathleen M. Miles; Stephen D. Sebestyen; Adam T. Spargo; Asa B. Stone; James M. Vose; Mark W. Williams
    Date: 2012
    Source: BioScience. 62(4): 390-404.
    Publication Series: Scientific Journal (JRNL)
    Station: Northern Research Station
    PDF: View PDF  (1.01 MB)

    Description

    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 NiƱo-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.

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    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.

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    Keywords

    precipitation/runoff ratio, trend, succession, socioecological systems, Budyko curve

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