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    Watershed Classification Predicts Streamflow Regime and Organic Carbon Dynamics in the Northeast Pacific Coastal Temperate Rainforest

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    Name:
    Global Biogeochemical Cycles - ...
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    Author
    Giesbrecht, Ian
    Tank, Suzanne
    Frazer, Gordon W.
    Hood, Eran
    Gonzalez Arriola, Santiago G.
    Butman, David E.
    D'amore, David V.
    Hutchinson, David
    Bidlack, Allison Lynn
    Lertzman, Ken P.
    Keyword
    watershed classification
    hydrological sciences
    coastal temperate rainforest
    streamflow
    runoff
    Metadata
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    URI
    http://hdl.handle.net/11122/13152
    Abstract
    Watershed classification has long been a key tool in the hydrological sciences, but few studies have been extended to biogeochemistry. We developed a combined hydro-biogeochemical classification for watersheds draining to the coastal margin of the Northeast Pacific coastal temperate rainforest (1,443,062 km2), including 2,695 small coastal rivers (SCR) and 10 large continental watersheds. We used cluster analysis to group SCR watersheds into 12 types, based on watershed properties. The most important variables for distinguishing SCR watershed types were evapotranspiration, slope, snowfall, and total precipitation. We used both streamflow and dissolved organic carbon (DOC) measurements from rivers (n = 104 and 90 watersheds respectively) to validate the classification. Watershed types corresponded with broad differences in streamflow regime, mean annual runoff, DOC seasonality, and mean DOC concentration. These links between watershed type and river conditions enabled the first region-wide empirical characterization of river hydrobiogeochemistry at the land-sea margin, spanning extensive ungauged and unsampled areas. We found very high annual runoff (mean > 3,000 mm, n = 10) in three watershed types totaling 59,024 km2 and ranging from heavily glacierized mountain watersheds with high flow in summer to a rain-fed mountain watershed type with high flow in fall-winter. DOC hotspots (mean > 4 mg L−1, n = 14) were found in three other watershed types (48,557 km2) with perhumid rainforest climates and less-mountainous topography. We described four patterns of DOC seasonality linked to watershed hydrology, with fall-flushing being widespread. Hydro-biogeochemical watershed classification may be useful for other complex regions with sparse observation networks.
    Date
    2022-01-28
    Publisher
    American Geophysical Union
    Type
    Article
    Peer-Reviewed
    Yes
    Citation
    Giesbrecht, I. J., Tank, S. E., Frazer, G. W., Hood, E., Gonzalez Arriola, S. G., Butman, D. E., D’Amore, D. V., Hutchinson, D., Bidlack, A., & Lertzman, K. P. (2022). Watershed classification predicts streamflow regime and Organic Carbon Dynamics in the northeast pacific coastal temperate rainforest. Global Biogeochemical Cycles, 36(2). https://doi.org/10.1029/2021gb007047
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    Hood, Eran

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