Technical note: Estimating light-use efficiency of benthic habitats using underwater O2 eddy covariance

This datafile contains all data required to recreate figures presented
in Attard KM & Glud RN (2020) Technical
Note: Estimating light-use efficiency of benthic habitats using
underwater O2 eddy covariance. Biogeosciences 
https://doi.org/10.5194/bg-2020-140  Paper abstract Light-use
efficiency defines the ability of primary producers to convert sunlight
energy to primary production and is computed as the ratio between the
gross primary production and the intercepted photosynthetic active
radiation. While this measure has been applied broadly within the
atmospheric sciences to investigate resource-use efficiency in terrestrial
habitats, it remains underused within the aquatic realm. This report
provides a conceptual framework to compute hourly and daily light-use
efficiency using underwater O2 eddy covariance, a recent technological
development that produces habitat-scale rates of primary production under
unaltered in situ conditions. The analysis, tested on two benthic flux
datasets, documents that hourly light-use efficiency may approach the
maximum theoretical limit of 0.125 O2 photon-1 under low light conditions
but it decreases rapidly towards the middle of the day and is typically
tenfold lower on a 24 h basis. Overall, light-use efficiency provides a
useful measure of habitat functioning and facilitates site comparison in
time and space.