Carbon dynamics in a Boreal land-stream-lake continuum during the spring freshet of two hydrologically contrasting years

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http://hdl.handle.net/10138/313715

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Miettinen , H , Pumpanen , J , Rantakari , M & Ojala , A 2020 , ' Carbon dynamics in a Boreal land-stream-lake continuum during the spring freshet of two hydrologically contrasting years ' , Biogeochemistry , vol. 148 , no. 1 , pp. 91-109 . https://doi.org/10.1007/s10533-020-00648-9

Title: Carbon dynamics in a Boreal land-stream-lake continuum during the spring freshet of two hydrologically contrasting years
Author: Miettinen, H.; Pumpanen, J.; Rantakari, M.; Ojala, A.
Contributor: University of Helsinki, Faculty of Biological and Environmental Sciences
University of Helsinki, Ecosystems and Environment Research Programme
Date: 2020-03
Language: eng
Number of pages: 19
Belongs to series: Biogeochemistry
ISSN: 0168-2563
URI: http://hdl.handle.net/10138/313715
Abstract: We studied in 2013 and 2014 the spring carbon dynamics in a Boreal landscape consisting of a lake and 15 inflowing streams and an outlet. The first year had weather and a hydrological regime typical of past years with a distinct spring freshet connected with the thaw of the average snowpack. The latter year had higher air temperatures which did not permit snow accumulation, despite similar winter precipitation. As such, there was hardly any spring freshet in 2014, and stream discharge peaked in January, i.e., the conditions resembled those predicted in the future climate. Despite the hydrological differences between the years, there were only small interannual differences in the stream CO2 and DOC concentrations. The relationship between the concentrations and discharge was stronger in the typical year. CO2 concentrations in medium-sized streams correlated negatively with the discharge, indicating dilution effect of melting snowpacks, while in large-sized streams the correlation was positive, suggesting stronger groundwater influence. The DOC pathway to these streams was through the subsurface soil layers, not the groundwater. The total amount of carbon transported into the lake was ca. 1.5-fold higher in the typical year than in the year with warm winter. In 2013, most of the lateral inputs took place during spring freshet. In 2014, the majority of inputs occurred earlier, during the winter months. The lateral CO2 signal was visible in the lake at 1.5 m depth. DOC dominated the carbon transport, and in both years, 12% of the input C was in inorganic form.
Subject: CO2
DOC
Lake carbon dynamics
Temporality
Terrestrial carbon export
DISSOLVED ORGANIC-CARBON
WATER CO2 CONCENTRATION
AQUATIC CARBON
TEMPORAL VARIABILITY
PEATLAND CATCHMENTS
HEADWATER STREAMS
SOIL-WATER
DIOXIDE
SNOWMELT
FLUXES
1181 Ecology, evolutionary biology
1172 Environmental sciences
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