Diel to interannual variation in carbon dioxide emissions from lakes and reservoirs | CU Experts

; Accounting for temporal changes in carbon dioxide (CO; 2; ); emissions from freshwaters remains a challenge for global and regional; carbon budgets. Here, we synthesize 171 site-months of eddy covariance; flux measurements of CO; 2; from 13 lakes and reservoirs in; the Northern Hemisphere (NH) and quantify dynamics at multiple temporal; scales. We found pronounced sub-annual variability in; CO; 2; flux at all sites. Accounting for diel variation,; only 11% of site-months were net daily sinks of CO; 2; .; Annual CO; 2; emissions had an average of 25% (range; 3-58%) interannual variation. Nighttime emissions regularly exceeded; daytime emissions. Sources of CO; 2; flux variability were; delineated through mutual information analysis. Sample analysis of; CO; 2; fluxes indicate importance of continuous sampling.; Constraining short- and long-term variability is necessary to improve; detection of temporal changes of CO; 2; fluxes in response; to natural and anthropogenic drivers.;

Golub M; Koupaei-Abyazani N; Vesala T; Mammarella I; Ojala A; Bohrer G; Weyhenmeyer GA; Blanken PD; Eugster W; Koebsch F

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