Catchment-scale dissolved carbon concentrations and export estimates across six subarctic streams in northern Sweden
Climatic change is currently enhancing permafrost thawing and the flow of water through the landscape in subarctic and arctic catchments, with major consequences for the carbon export to aquatic ecosystems. We studied stream water carbon export in several tundra-dominated catchments in northern Swed...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2014-01-01
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| Series: | Biogeosciences |
| Online Access: | http://www.biogeosciences.net/11/525/2014/bg-11-525-2014.pdf |
| _version_ | 1819181532614492160 |
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| author | R. Giesler S. W. Lyon C.-M. Mörth J. Karlsson E. M. Karlsson E. J. Jantze G. Destouni C. Humborg |
| author_facet | R. Giesler S. W. Lyon C.-M. Mörth J. Karlsson E. M. Karlsson E. J. Jantze G. Destouni C. Humborg |
| author_sort | R. Giesler |
| collection | DOAJ |
| description | Climatic change is currently enhancing permafrost thawing and the flow of
water through the landscape in subarctic and arctic catchments, with major
consequences for the carbon export to aquatic ecosystems. We studied stream
water carbon export in several tundra-dominated catchments in northern
Sweden. There were clear seasonal differences in both dissolved organic
carbon (DOC) and dissolved inorganic carbon (DIC) concentrations. The highest
DOC concentrations occurred during the spring freshet while the highest DIC
concentrations were always observed during winter baseflow conditions for the
six catchments considered in this study. Long-term trends for the period 1982
to 2010 for one of the streams showed that DIC concentrations has increased
by 9% during the 28 yr of measurement while no clear trend was found
for DOC. Similar increasing trends were also found for conductivity, Ca and
Mg. When trends were discretized into individual months, we found a
significant linear increase in DIC concentrations with time for September,
November and December. In these subarctic catchments, the annual mass of C
exported as DIC was in the same order of magnitude as DOC; the average
proportion of DIC to the total dissolved C exported was 61% for the six
streams. Furthermore, there was a direct relationship between total runoff
and annual dissolved carbon fluxes for these six catchments. These
relationships were more prevalent for annual DIC exports than annual DOC
exports in this region. Our results also highlight that both DOC and DIC can
be important in high-latitude ecosystems. This is particularly relevant in
environments where thawing permafrost and changes to subsurface ice due to
global warming can influence stream water fluxes of C. The large proportion
of stream water DIC flux also has implications on regional C budgets and
needs to be considered in order to understand climate-induced feedback
mechanisms across the landscape. |
| first_indexed | 2024-12-22T22:31:44Z |
| format | Article |
| id | doaj.art-1a24f955c2ba4131911c0314f8b88ce9 |
| institution | Directory Open Access Journal |
| issn | 1726-4170 1726-4189 |
| language | English |
| last_indexed | 2024-12-22T22:31:44Z |
| publishDate | 2014-01-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Biogeosciences |
| spelling | doaj.art-1a24f955c2ba4131911c0314f8b88ce92022-12-21T18:10:26ZengCopernicus PublicationsBiogeosciences1726-41701726-41892014-01-0111252553710.5194/bg-11-525-2014Catchment-scale dissolved carbon concentrations and export estimates across six subarctic streams in northern SwedenR. Giesler0S. W. Lyon1C.-M. Mörth2J. Karlsson3E. M. Karlsson4E. J. Jantze5G. Destouni6C. Humborg7Climate Impacts Research Centre, Abisko, SwedenBert Bolin Centre for Climate Research, Stockholm, SwedenDepartment of Geological Sciences, Stockholm, SwedenClimate Impacts Research Centre, Abisko, SwedenSchool of Civil Engineering, Ecological Sciences and Engineering Interdisciplinary Graduate Program, Purdue University, West Lafayette, Indiana, USABert Bolin Centre for Climate Research, Stockholm, SwedenBert Bolin Centre for Climate Research, Stockholm, SwedenDepartment of Applied Environmental Science, Stockholm, SwedenClimatic change is currently enhancing permafrost thawing and the flow of water through the landscape in subarctic and arctic catchments, with major consequences for the carbon export to aquatic ecosystems. We studied stream water carbon export in several tundra-dominated catchments in northern Sweden. There were clear seasonal differences in both dissolved organic carbon (DOC) and dissolved inorganic carbon (DIC) concentrations. The highest DOC concentrations occurred during the spring freshet while the highest DIC concentrations were always observed during winter baseflow conditions for the six catchments considered in this study. Long-term trends for the period 1982 to 2010 for one of the streams showed that DIC concentrations has increased by 9% during the 28 yr of measurement while no clear trend was found for DOC. Similar increasing trends were also found for conductivity, Ca and Mg. When trends were discretized into individual months, we found a significant linear increase in DIC concentrations with time for September, November and December. In these subarctic catchments, the annual mass of C exported as DIC was in the same order of magnitude as DOC; the average proportion of DIC to the total dissolved C exported was 61% for the six streams. Furthermore, there was a direct relationship between total runoff and annual dissolved carbon fluxes for these six catchments. These relationships were more prevalent for annual DIC exports than annual DOC exports in this region. Our results also highlight that both DOC and DIC can be important in high-latitude ecosystems. This is particularly relevant in environments where thawing permafrost and changes to subsurface ice due to global warming can influence stream water fluxes of C. The large proportion of stream water DIC flux also has implications on regional C budgets and needs to be considered in order to understand climate-induced feedback mechanisms across the landscape.http://www.biogeosciences.net/11/525/2014/bg-11-525-2014.pdf |
| spellingShingle | R. Giesler S. W. Lyon C.-M. Mörth J. Karlsson E. M. Karlsson E. J. Jantze G. Destouni C. Humborg Catchment-scale dissolved carbon concentrations and export estimates across six subarctic streams in northern Sweden Biogeosciences |
| title | Catchment-scale dissolved carbon concentrations and export estimates across six subarctic streams in northern Sweden |
| title_full | Catchment-scale dissolved carbon concentrations and export estimates across six subarctic streams in northern Sweden |
| title_fullStr | Catchment-scale dissolved carbon concentrations and export estimates across six subarctic streams in northern Sweden |
| title_full_unstemmed | Catchment-scale dissolved carbon concentrations and export estimates across six subarctic streams in northern Sweden |
| title_short | Catchment-scale dissolved carbon concentrations and export estimates across six subarctic streams in northern Sweden |
| title_sort | catchment scale dissolved carbon concentrations and export estimates across six subarctic streams in northern sweden |
| url | http://www.biogeosciences.net/11/525/2014/bg-11-525-2014.pdf |
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