New insights into 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 the magnitude and dynamics at; multiple temporal scales. We found pronounced diel and sub-monthly; oscillatory variations in CO; 2; flux at all sites. Diel; variation converted sites to daily net sinks of CO; 2; in; only 11% of site-months. Upscaled annual emissions had an average of; 25% (range 3-58%) interannual variation. Given temporal variation; remains under-represented in inventories of CO; 2; emissions from lakes and reservoirs, revisions in CO; 2; flux are needed using a better representation of sub-daily to; interannual variability. 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; Desai AR; Vesala T; Mammarella I; Ojala A; Bohrer G; Weyhenmeyer GA; Blanken PD; Eugster W; Koebsch F

VIVO