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Modeling the dissolved organic carbon output from a boreal mire using the convection-dispersion equation: Importance of representing sorption

Yurova, Alla LU ; Sirin, Andrey; Buffam, Ishi; Bishop, Kevin and Laudon, Hjalmar (2008) In Water Resources Research 44(7).
Abstract
In this paper we present a model of the dissolved organic carbon (DOC) concentrations and fluxes in mire water based on the convection-dispersion equation. The dynamics of sorbed, potentially soluble organic carbon (SPSOC) in the peat matrix are simulated in parallel with DOC. First, the model is applied solely to stagnant water conditions in order to interpret the results of laboratory peat incubations, with the focus on sorption processes. Some important model parameters are derived using literature data complemented by information from new incubation experiments. Second, the model is fully applied to simulate the DOC concentrations in the outlet of a steam draining a small headwater mire in northern Sweden during the period 1993-2001. A... (More)
In this paper we present a model of the dissolved organic carbon (DOC) concentrations and fluxes in mire water based on the convection-dispersion equation. The dynamics of sorbed, potentially soluble organic carbon (SPSOC) in the peat matrix are simulated in parallel with DOC. First, the model is applied solely to stagnant water conditions in order to interpret the results of laboratory peat incubations, with the focus on sorption processes. Some important model parameters are derived using literature data complemented by information from new incubation experiments. Second, the model is fully applied to simulate the DOC concentrations in the outlet of a steam draining a small headwater mire in northern Sweden during the period 1993-2001. A relatively good model fit (mean bias error (MBE) = -0.6-2.2 mg L-1, Willmott index of agreement d > 0.7 for the daily concentrations) was found for all the categories of stream discharge, except periods with very low flow (q < 0.3 mm d(-1)). When seeking explanations for the interannual variability in DOC concentrations, we, like previous authors, could find the influence of temperature, flow path, and intensity. However, the model has helped to demonstrate that the system also has a "memory'': the store of sorbed, potentially soluble organic carbon in a year affects the DOC concentrations and fluxes in the following year. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Water Resources Research
volume
44
issue
7
publisher
American Geophysical Union
external identifiers
  • wos:000258003100001
  • scopus:53649101357
ISSN
0043-1397
DOI
10.1029/2007WR006523
language
English
LU publication?
yes
id
fa3eea23-e308-4b80-ae7c-7ea60ce4477b (old id 1253552)
date added to LUP
2008-10-28 16:29:00
date last changed
2017-08-20 03:57:51
@article{fa3eea23-e308-4b80-ae7c-7ea60ce4477b,
  abstract     = {In this paper we present a model of the dissolved organic carbon (DOC) concentrations and fluxes in mire water based on the convection-dispersion equation. The dynamics of sorbed, potentially soluble organic carbon (SPSOC) in the peat matrix are simulated in parallel with DOC. First, the model is applied solely to stagnant water conditions in order to interpret the results of laboratory peat incubations, with the focus on sorption processes. Some important model parameters are derived using literature data complemented by information from new incubation experiments. Second, the model is fully applied to simulate the DOC concentrations in the outlet of a steam draining a small headwater mire in northern Sweden during the period 1993-2001. A relatively good model fit (mean bias error (MBE) = -0.6-2.2 mg L-1, Willmott index of agreement d &gt; 0.7 for the daily concentrations) was found for all the categories of stream discharge, except periods with very low flow (q &lt; 0.3 mm d(-1)). When seeking explanations for the interannual variability in DOC concentrations, we, like previous authors, could find the influence of temperature, flow path, and intensity. However, the model has helped to demonstrate that the system also has a "memory'': the store of sorbed, potentially soluble organic carbon in a year affects the DOC concentrations and fluxes in the following year.},
  author       = {Yurova, Alla and Sirin, Andrey and Buffam, Ishi and Bishop, Kevin and Laudon, Hjalmar},
  issn         = {0043-1397},
  language     = {eng},
  number       = {7},
  publisher    = {American Geophysical Union},
  series       = {Water Resources Research},
  title        = {Modeling the dissolved organic carbon output from a boreal mire using the convection-dispersion equation: Importance of representing sorption},
  url          = {http://dx.doi.org/10.1029/2007WR006523},
  volume       = {44},
  year         = {2008},
}