Sediment respiration drives circulation and production of CO2 in ice-covered Alaskan arctic lakes MacIntyre, Sally Cortés Cortés, Alicia Sadro, Steven Under-ice circulation Density currents Sediment respiration Carbon dioxide (CO2) Dissolved oxygen The goals of our study were to (1) quantify production of CO2 during winter ice-cover in arctic lakes, (2) develop methodologies which would enable prediction of CO2 production from readily measured variables, and (3) improve understanding of under-ice circulation as it influences the distribution of dissolved gases under the ice. To that end, we combined in situ measurements with profile data. CO2 production averaged 20 mg C m−2 d−1 in a 3 m deep lake and ∼ 45 mg C m−2 d−1 in four larger lakes, similar to experimental observations at temperatures below 4°C. CO2 production was predicted by the initial rate of loss of oxygen near the sediments at ice-on and by the full water column loss of oxygen throughout the winter. The time series data also showed the lake-size and time dependent contribution of sediment respiration to under-ice circulation and the decreased near-bottom flows enabling anoxia and CH4 accumulation. 2026-02-18T07:40:42Z 2026-02-18T07:40:42Z 2018-04-23 journal article MacIntyre, S., A. Cortés, S. Sadro. 2018. Sediment respiration drives circulation and production of CO2 in ice-covered Alaskan arctic lakes. Limnol. Oceanogr. Letters. 3:302-310, doi: 10.1002/lol2.10083 https://hdl.handle.net/10481/111130 10.1002/lol2.10083 eng http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 Internacional Wiley