Contrasting responses in dissolved organic carbon to extreme climate events from adjacent boreal landscapes in Northern Sweden
The ongoing pressures of climate change, as expressed by the increased intensity, duration, and frequency of temperature and precipitation events, threatens the storage of carbon in northern latitudes. One key concern is how these events will affect the production, mobilization, and export of dissol...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2019-01-01
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| Series: | Environmental Research Letters |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1748-9326/ab23d4 |
| _version_ | 1827870668312543232 |
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| author | Tejshree Tiwari Ryan A Sponseller Hjalmar Laudon |
| author_facet | Tejshree Tiwari Ryan A Sponseller Hjalmar Laudon |
| author_sort | Tejshree Tiwari |
| collection | DOAJ |
| description | The ongoing pressures of climate change, as expressed by the increased intensity, duration, and frequency of temperature and precipitation events, threatens the storage of carbon in northern latitudes. One key concern is how these events will affect the production, mobilization, and export of dissolved organic carbon (DOC), the main form of aquatic carbon export in these regions. In this study, we retrospectively show contrasting effects of climate extremes over 23 years on two adjacent boreal catchments, one dominated by forest cover and the other draining a mire (wetland), despite experiencing the same extreme climate events. During the peak snowmelt, DOC concentrations ranged from 20 to 33 mg l ^−1 in the forest catchment and 10–28 mg l ^−1 in the mire catchment respectively, highlighting large inter-annual variation in the springtime hydrologic C export at both sites. We used climate and discharge variables to predict this variation, and found that DOC from the forested catchment, which is derived largely from riparian soils, had the highest concentrations following cold summers, dry autumns, and winters with high precipitation. By contrast, in the mire outlet, where DOC is primarily derived from decomposing peat, the highest DOC concentrations in the spring followed cold/dry winters and dry summers. Our results indicate that processes regulating stream DOC concentrations during spring in both catchments were dependent on both temperature and precipitation in multiple seasons. Together, these patterns suggest that DOC responses to climatic extremes are complex and generate variable patterns in springtime concentrations that are strongly dependent upon landscape context. |
| first_indexed | 2024-03-12T15:59:31Z |
| format | Article |
| id | doaj.art-5839b1c73393402ebf2ab65a70943cd8 |
| institution | Directory Open Access Journal |
| issn | 1748-9326 |
| language | English |
| last_indexed | 2024-03-12T15:59:31Z |
| publishDate | 2019-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Environmental Research Letters |
| spelling | doaj.art-5839b1c73393402ebf2ab65a70943cd82023-08-09T14:41:22ZengIOP PublishingEnvironmental Research Letters1748-93262019-01-0114808400710.1088/1748-9326/ab23d4Contrasting responses in dissolved organic carbon to extreme climate events from adjacent boreal landscapes in Northern SwedenTejshree Tiwari0Ryan A Sponseller1Hjalmar Laudon2Department of Forest Ecology and Management, Swedish University of Agricultural Sciences , SE-901 83 Umea, SwedenDepartment of Ecology and Environmental Sciences, Umea University , SE-901 87 Umea, SwedenDepartment of Forest Ecology and Management, Swedish University of Agricultural Sciences , SE-901 83 Umea, SwedenThe ongoing pressures of climate change, as expressed by the increased intensity, duration, and frequency of temperature and precipitation events, threatens the storage of carbon in northern latitudes. One key concern is how these events will affect the production, mobilization, and export of dissolved organic carbon (DOC), the main form of aquatic carbon export in these regions. In this study, we retrospectively show contrasting effects of climate extremes over 23 years on two adjacent boreal catchments, one dominated by forest cover and the other draining a mire (wetland), despite experiencing the same extreme climate events. During the peak snowmelt, DOC concentrations ranged from 20 to 33 mg l ^−1 in the forest catchment and 10–28 mg l ^−1 in the mire catchment respectively, highlighting large inter-annual variation in the springtime hydrologic C export at both sites. We used climate and discharge variables to predict this variation, and found that DOC from the forested catchment, which is derived largely from riparian soils, had the highest concentrations following cold summers, dry autumns, and winters with high precipitation. By contrast, in the mire outlet, where DOC is primarily derived from decomposing peat, the highest DOC concentrations in the spring followed cold/dry winters and dry summers. Our results indicate that processes regulating stream DOC concentrations during spring in both catchments were dependent on both temperature and precipitation in multiple seasons. Together, these patterns suggest that DOC responses to climatic extremes are complex and generate variable patterns in springtime concentrations that are strongly dependent upon landscape context.https://doi.org/10.1088/1748-9326/ab23d4extreme climate eventsboreal streamspeatlandboreal forestclimate changewater quality |
| spellingShingle | Tejshree Tiwari Ryan A Sponseller Hjalmar Laudon Contrasting responses in dissolved organic carbon to extreme climate events from adjacent boreal landscapes in Northern Sweden Environmental Research Letters extreme climate events boreal streams peatland boreal forest climate change water quality |
| title | Contrasting responses in dissolved organic carbon to extreme climate events from adjacent boreal landscapes in Northern Sweden |
| title_full | Contrasting responses in dissolved organic carbon to extreme climate events from adjacent boreal landscapes in Northern Sweden |
| title_fullStr | Contrasting responses in dissolved organic carbon to extreme climate events from adjacent boreal landscapes in Northern Sweden |
| title_full_unstemmed | Contrasting responses in dissolved organic carbon to extreme climate events from adjacent boreal landscapes in Northern Sweden |
| title_short | Contrasting responses in dissolved organic carbon to extreme climate events from adjacent boreal landscapes in Northern Sweden |
| title_sort | contrasting responses in dissolved organic carbon to extreme climate events from adjacent boreal landscapes in northern sweden |
| topic | extreme climate events boreal streams peatland boreal forest climate change water quality |
| url | https://doi.org/10.1088/1748-9326/ab23d4 |
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