Using stable isotopes to assess surface water source dynamics and hydrological connectivity in a high-latitude wetland and permafrost influenced landscape

JOURNAL OF HYDROLOGY

卷:556

Article

Ala-aho, P.¹  Soulsby, C.¹  Pokrovsky, O. S.^2,3  Kirpotin, S. N.⁴  Karlsson, J.⁵  Serikova, S.⁵  Vorobyev, S. N.⁴  Manasypov, R. M.⁴  Loiko, S.⁴  Tetzlaff, D.¹ 

[1] Univ Aberdeen, Sch Geosci, Northern Rivers Inst, Aberdeen, Scotland

[2] Univ Toulouse, CNRS, GET, UMR 5563, Toulouse, France

[3] Russian Acad Sci, N Laverov Fed Ctr Integrated Arctic Res, Moscow, Russia

[4] Tomsk State Univ, BIO GEO CLIM Lab, Tomsk, Russia

[5] Umea Univ, Dept Ecol & Environm Sci, Umea, Sweden

关键词: Stable water isotopes;    Hydrological connectivity;    Runoff generation;    Snowmelt;    Low-relief;   

DOI  :  10.1016/j.jhydrol.2017.11.024

来源: Elsevier

【 摘 要 】

Climate change is expected to alter hydrological and biogeochemical processes in high-latitude inland waters. A critical question for understanding contemporary and future responses to environmental change is how the spatio-temporal dynamics of runoff generation processes will be affected. We sampled stable water isotopes in soils, lakes and rivers on an unprecedented spatio-temporal scale along a 1700 km transect over three years in the Western Siberia Lowlands. Our findings suggest that snowmelt mixes with, and displaces, large volumes of water stored in the organic soils and lakes to generate runoff during the thaw season. Furthermore, we saw a persistent hydrological connection between water bodies and the landscape across permafrost regions. Our findings help to bridge the understanding between small and large scale hydrological studies in high-latitude systems. These isotope data provide a means to conceptualise hydrological connectivity in permafrost and wetland influenced regions, which is needed for an improved understanding of future biogeochemical changes. (C) 2017 The Authors. Published by Elsevier B.V.

【 授权许可】

Free