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Research article - Peer-reviewed, 2020

Increasing non-linearity of the storage-discharge relationship insub-Arcticcatchments

Hinzman, Alexa M.; Sjoeberg, Ylva; Lyon, Steve W.; Ploum, Stefan W.; van der Velde, Ype

Abstract

The Arctic is warming at an unprecedented rate. We hypothesis that as seasonally frozen soils thaw and recede in extent as a response to this warming, flow path diversity and thus hydrologic connectivity increases. This enhanced hydrologic connectivity then increases the non-linearity of the storage-discharge relationship in a catchment. The objective of this study is to test this hypothesis by quantifying trends and spatio-temporal differences in the degree of linearity in the storage-discharge relationships for 16 catchments within Northern Sweden from 1950 to 2018. We demonstrate a clear increase in non-linearity of the storage-discharge relationship over time for all catchments with 75% showing a statistically significant increase in non-linearity. Spring has significantly more linear storage-discharge relationships than summer for most catchments (75%) supporting the idea that seasonally frozen soils with a low degree of hydrological connectivity have a linear storage-discharge relationship. For the period considered, spring also showed greater change in storage-discharge relationship trends than summer signifying that changes in recessions are primarily occurring during the thawing period. Separate storage-discharge analyses combined with preceding winter conditions demonstrated that especially cold winters with little snow yielded springs and summers with more linear storage-discharge relationships. We show that streamflow recession analysis reflects ongoing hydrological change of an arctic landscape as well as offering new metrics for tracking change across arctic and sub-arctic landscapes.

Keywords

arctic hydrology; recession analysis; seasonally frozen soil; storage-discharge; thaw

Published in

Hydrological Processes
2020, Volume: 34, number: 19, pages: 3894-3909
Publisher: WILEY

    UKÄ Subject classification

    Oceanography, Hydrology, Water Resources
    Climate Research

    Publication identifier

    DOI: https://doi.org/10.1002/hyp.13860

    Permanent link to this page (URI)

    https://res.slu.se/id/publ/107045