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

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 CO 2 and DOC concentrations. The relationship between the concentrations and discharge was stronger in the typical year. CO 2 concentrations in medium-sized streams correlated negatively with the discharge, indicating dilution effect of melting

Ozone Fluxes Over a Boreal Lake Exhibit Enhanced Deposition at Nights

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Browning of boreal lakes: Do public perceptions and governance align with the biological foundations?

“…Periods with heavy rainfall can result in significantly increased loading of organic matter and ferrous compounds from exposed terrains (Hongve et al, 2004; Kothawala et al, 2014; Tuvendal & Elmqvist, 2011). These impacts are magnified with anthropogenic impacts such as climate change, intensive forestry, and peatland drainage (Björnerås et al, 2021; Klante et al, 2021; Miettinen et al, 2020; Peltomaa & Ojala, 2016; Sarkkola et al, 2013; Strock et al, 2017).…”