Diel, seasonal, and inter-annual variation in carbon dioxide effluxes from lakes and reservoirs
Bibliographic Data
Accounting for temporal changes in carbon dioxide (CO 2 ) effluxes from freshwaters remains a challenge for global and regional carbon budgets. Here, we synthesize 171 site-months of flux measurements of CO 2 based on the eddy covariance method from 13 lakes and reservoirs in the Northern Hemisphere, and quantify dynamics at multiple temporal scales. We found pronounced sub-annual variability in CO 2 flux at all sites. By 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. Similar to studies on streams, nighttime emissions regularly exceeded daytime emissions. Biophysical regulations of CO 2 flux variability were delineated through mutual information analysis. Sample analysis of CO 2 fluxes indicate the importance of continuous measurements. Better characterization of short- and long-term variability is necessary to understand and improve detection of temporal changes of CO 2 fluxes in response to natural and anthropogenic drivers. Our results indicate that existing global lake carbon budgets relying primarily on daytime measurements yield underestimates of net emissions
Atmospheric sciences · Carbon dioxide · Carbon sink · Climate change · Climatology · Daytime · Diel vertical migration · Ecosystem · Eddy covariance · Flux (metallurgy · Northern Hemisphere · Range (aeronautics · Seasonality · Atmospheric and Environmental Gas Dynamics · Chemistry · Environmental Science · Marine and coastal ecosystems · Oceanographic and Atmospheric Processes · Ecology · Geology · Oceanography
Development and validation of a global database of lakes, reservoirs and wetlands
Global Carbon Budget 2020
Plumbing the Global Carbon Cycle
Large CO 2 effluxes at night and during synoptic weather events significantly contribute to CO 2 emissions from a reservoir
Greenhouse gas fluxes from reservoirs determined by watershed lithology, morphometry, and anthropogenic pressure
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