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Increasing non-linearity of the storage-discharge relationship in sub-Arctic catchments
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2020 (Engelska)Ingår i: Hydrological Processes, ISSN 0885-6087, E-ISSN 1099-1085, Vol. 34, nr 19, s. 3894-3909Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

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.

Ort, förlag, år, upplaga, sidor
John Wiley & Sons, Ltd , 2020. Vol. 34, nr 19, s. 3894-3909
Nyckelord [en]
arctic hydrology, recession analysis, seasonally frozen soil, storage-discharge, thaw
Nationell ämneskategori
Geovetenskap och miljövetenskap
Identifikatorer
URN: urn:nbn:se:polar:diva-8633DOI: 10.1002/hyp.13860OAI: oai:DiVA.org:polar-8633DiVA, id: diva2:1519425
Tillgänglig från: 2021-01-18 Skapad: 2021-01-18 Senast uppdaterad: 2021-01-18Bibliografiskt granskad

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