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Controls on snowmel...
Controls on snowmelt water mean transit times in northern boreal catchments
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- Lyon, Steve W. (author)
- Department of Physical Geography and Quaternary Geology, Stockholm University, Stockholm, Sweden
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- Laudon, Hjalmar (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management,Department of Forest Ecology and Management, SLU, Umeå, Sweden
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- Seibert, J. (author)
- Department of Physical Geography and Quaternary Geology, Stockholm University, Stockholm, Sweden
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- Mörth, Magnus (author)
- Department of Geology and Geochemistry, Stockholm University, Stockholm, Sweden
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- Tetzlaff, Doerthe (author)
- School of Geosciences, University of Aberdeen, Aberdeen, Scotland
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- Bishop, Kevin (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för vatten och miljö,Department of Aquatic Sciences and Assessment,Department of Aquatic Sciences and Assessment, SLU, Uppsala, Sweden
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(creator_code:org_t)
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- 2010-01-08
- 2010
- English.
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In: Hydrological Processes. - : Wiley. - 0885-6087 .- 1099-1085. ; 24:12, s. 1672-1684
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Abstract
Subject headings
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- Catchment-scale transit times for water are increasingly being recognized as an important control on geochemical processes. In this study, snowmelt water mean transit times (MTTs) were estimated for the 15 Krycklan research catchments in northern boreal Sweden. The snowmelt water MTTs were assumed to be representative of the catchment-scale hydrologic response during the spring thaw period and, as such, may be considered to be a component of the catchment's overall MTT. These snowmelt water MTTs were empirically related to catchment characteristics and landscape structure represented by using different indices of soil cover, topography and catchment similarity. Mire wetlands were shown to be significantly correlated to snowmelt MTTs for the studied catchments. In these wetlands, shallow ice layers form that have been shown to serve as impervious boundaries to vertical infiltration during snowmelt periods and, thus, alter the flow pathways of water in the landscape. Using a simple thought experiment, we could estimate the potential effect of thawing of ice layers on snowmelt hydrologic response using the empirical relationship between landscape structure (represented using a catchment-scale Pe number) and hydrologic response. The result of this thought experiment was that there could be a potential increase of 20-45% in catchment snowmelt water MTTs for the Krycklan experimental catchments. It is therefore possible that climatic changes present competing influences on the hydrologic response of northern boreal catchments that need to be considered. For example, MTTs may tend to decrease during some times of the year due to an acceleration in the hydrologic cycle, while they tend to increase MTTs during other times of the year due to shifts in hydrologic flow pathways. The balance between the competing influences on a catchment's MTT has consequences on climatic feedbacks as it could influence hydrological and biogeochemical cycles at the catchment scale for northern latitude boreal catchments. Copyright (C) 2010 John Wiley & Sons, Ltd.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)
Keyword
- mean transit time
- catchment similarity
- boreal systems
- climate change
- wetlands
- snowmelt
Publication and Content Type
- ref (subject category)
- art (subject category)
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