Home About Browse Search
Svenska


Hydrological control of water quality – modelling base cation weathering and dynamics across heterogeneous boreal catchments

Jutebring Sterte, Elin and Lidman, Fredrik and Balbarini, Nicola and Lindborg, Emma and Sjöberg, Ylva and Selroos, Jan-Olof and Laudon, Hjalmar (2021). Hydrological control of water quality – modelling base cation weathering and dynamics across heterogeneous boreal catchments. Science of the Total Environment. 799 , 149101
[Research article]

[img] PDF
2MB

Abstract

Linking biogeochemical processes to water flow paths and solute travel times is important for understanding internal catchment functioning and control of water quality. Base cation weathering is a process closely linked to key factors affecting catchment functioning, including water pathways, soil contact time, and catchment characteristics, particularly in silicate-dominated areas. However, common process-based weathering models are often calibrated and applied for individual soil profiles, which can cause problems when trying to extrapolate results to catchment scale and assess consequences for stream water and groundwater quality. Therefore, in this work, base cation export was instead modelled using a fully calibrated 3D hydrological model (Mike SHE) of a boreal catchment, which was expanded by adding a relatively simple but still reasonably flexible and versatile weathering module including the base cations Na, K, Mg, and Ca. The results were evaluated using a comprehensive dataset of water chemistry from groundwater and stream water in 14 nested sub-catchments, representing different catchment sizes and catchment characteristics. The strongest correlations with annual and seasonal observations were found for Ca (r = 0.89-0.93, p < 0.05), Mg (r = 0.90-0.95, p < 0.05), and Na (r = 0.80-0.89, p < 0.05). These strong correlations suggest that catchment hydrology and landscape properties primarily control weathering rates and stream dynamics of these solutes. Furthermore, catchment export of Mg, Ca, and K was strongly connected to travel times of discharging stream water (r = 0.78-0.83). Conversely, increasing Na export was linked to a reduced areal proportion of mires (r = -0.79). The results suggest that a significant part (~45%) of the catchment stream export came from deep-soil weathering sources (>2.5 m). These results have implications for terrestrial and aquatic water quality assessments. If deep soils are present, focusing mainly on the shallow soil could lead to misrepresentation of base cation availability and the acidification sensitivity of groundwater and water recipients such as streams and lakes.K

Authors/Creators:Jutebring Sterte, Elin and Lidman, Fredrik and Balbarini, Nicola and Lindborg, Emma and Sjöberg, Ylva and Selroos, Jan-Olof and Laudon, Hjalmar
Title:Hydrological control of water quality – modelling base cation weathering and dynamics across heterogeneous boreal catchments
Series Name/Journal:Science of the Total Environment
Year of publishing :2021
Volume:799
Article number:149101
ISSN:0048-9697
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Oceanography, Hydrology, Water Resources
Keywords:Calcium, Magnesium, Potassium, Sodium, ExportT, ravel time
URN:NBN:urn:nbn:se:slu:epsilon-p-112984
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-112984
Additional ID:
Type of IDID
DOI10.1016/j.scitotenv.2021.149101
ID Code:24975
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Ecology and Management
Deposited By: SLUpub Connector
Deposited On:20 Aug 2021 11:42
Metadata Last Modified:20 Aug 2021 11:51

Repository Staff Only: item control page

Downloads

Downloads per year (since September 2012)

View more statistics

Downloads
Hits