High-resolution time series of day and night outgassing rates of carbon dioxide and methane for six tributaries of Hampshire River Avon (UK) collected with an automated floating chamber in late spring 2015.

Data were collected in six headwater reaches of the lowland catchment of the Hampshire River Avon (UK), specifically on Chalk River Ebble and River Wylye, Greensand River Nadder and West Avon, and clay River Sem and Sem Tributary River Priors between May 19^th and June 5^th 2015. The setup consists of a floating LiCor Long-Term Chamber (Model 8100-101; total volume 6.29 L) connected to a Cambell Scientific Datalogger (CR800-Series) for chamber control and data logging. Fluxes were computed as the initial linear increase in both CO₂ and CH₄ at 10 min intervals. An r² value of 0.9 was used as quality cut-off (i.e., quality check) to flag weak regressions.<br> A more comprehensive description of the datasets is available from the manuscript below. Rovelli L., L. A. Olde, C. M. Heppell, A. Binley, G. Yvon-Durocher, R. N. Glud, M. Trimmer. Contrasting biophysical controls on carbon dioxide and methane outgassing from streams. <i>Journal of Geophysical Research: Biogeosciences</i><i> </i>(under revision as of 12. September 2021; the complete reference will be added as soon as the reviewer process is complete)