Contribution of CO2 and CH4 emissions at ice-melt to annual emissions from 450 and 270 lakes, respectively, 1986 to 2014

• Main Authors: Blaize A. Denfeld, Helen M. Baulch, Paul A. Del Giorgio, Stephanie E. Hampton, Jan Karlsson
• Format: Dataset
• Language: unknown
• Published: Environmental Data Initiative 2018
• Subjects: Carbon dioxide flux; methane flux; ice-melt emission; GLEON; Global Lake Observatory Network; CO2; CH4; lake; ice; emission; Arctic; Siberia
• Online Access: https://pasta.lternet.edu/package/metadata/eml/edi/137/3

The ice-covered period on lakes in the northern hemisphere can be extensive, lasting up to 7 months of the year. During this time, C cycling in lakes is altered affecting CO2 and CH4 dynamics below ice. Lake ice impedes atmospheric exchange, trapping CO2 and CH4 in the lake over winter. As lake ice-melts, CO2 and CH4 that has accumulated over winter is emitted from the into the atmosphere. To investigate the importance of CO2 and CH4 emissions during the ice-melt period, we conducted a literature search for studies that had CO2 and CH4 emission estimates for both the ice-melt and open water period. From these literature values, we could calculate the percent contribution of the ice-melt period to annual CO2 and CH4 emissions. We obtained data for 271 (n= 258) and 447 (n= 689) individual lakes, for CH4 and CO2, respectively.