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5/21/2018 | 3:15 PM - 3:30 PM | AQUATIC METABOLISM IS AN IMPORTANT DRIVER OF CO2 DYNAMICS IN ARCTIC STREAMS OF SWEDEN | 330 B

AQUATIC METABOLISM IS AN IMPORTANT DRIVER OF CO2 DYNAMICS IN ARCTIC STREAMS OF SWEDEN

Streams play an important role in the carbon (C) cycle, accounting for a large portion of CO2 emissions from inland waters, despite their small areal coverage. However, the relative importance of different terrestrial and aquatic processes driving CO2 evasion from streams remains poorly understood. In this study, we measured CO2 and O2 continuously in seven arctic streams in northern Sweden during the summers of 2015 and 2016 to estimate daily metabolic rates and CO2 evasion simultaneously. Preliminary estimates of stream ecosystem respiration ranged between -3.5 and -10 g O2 m-2 d-1, were comparable to values from the temperate zone, and accounted for a large fraction of the CO2 evaded. While some studies suggest that photooxidation of organic matter is a key pathway for CO2 production in arctic freshwaters, we consistently observed markedly lower CO2 concentrations during the day than at night. Moreover, estimates of gross primary production ranged from 0.2 - 1.4 g O2 m-2 d-1 and explained a substantial part of the diel pattern in CO2 concentrations. Our results indicate that in-stream metabolism plays a large role in the CO2 dynamics of these arctic streams.

Arctic
Carbon
Metabolism

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Presenters/Authors

Gerard Rocher-Ros (), Climate Impacts Research Centre, Department of Ecology and Environmental Science, Umeå University, 981 07 Abisko, Sweden, gerard.rocher@umu.se;