Surface-layer similarity sets the smallest greenhouse gas flux detectable above a tropical pasture

Data and code supporting the article "Surface-layer similarity sets the smallest greenhouse gas flux detectable above a tropical pasture" (Paraíba, Lima & Pazianotto), submitted to Water, Air, & Soil Pollution. The deposit contains the static chamber fluxes of CO2, CH4 and N2O measured in two 24 h campaigns in a 23.4 ha palisadegrass pasture at FZEA/USP, Pirassununga, São Paulo, Brazil (21°58.763'S, 47°26.438'W, 630 m a.s.l.), on 13-14 February 2020 and 25-26 January 2022; the geometry of the pasture; the upper-air soundings and the cloud cover used to drive AERMET; the AERMET and AERMOD (version 24142) control files of the reference configuration and of the eleven alternative configurations of the sensitivity analysis; the hourly dispersion factors produced by AERMOD at the mast and on a polar receptor grid; the output of a backward Lagrangian stochastic model used as an independent check; the tables of results; and the Python scripts of the whole analysis. Version 2 accompanies a rewriting of the manuscript around the separation between flux and transport. It adds the hourly table of friction velocity, Obukhov length, upwind fetch and dispersion factor used to fit the similarity law of the article, the hourly minimum detectable flux of each gas against the WMO compatibility goals, and the enhancements, the uncertainty decomposition and the configuration ratios recomputed under a single declared nocturnal window of 19:00 to 09:00 local time. It also adds the scripts of the similarity analysis, the numerical verification of the shape factor of the slab balance, and two self-contained scripts that regenerate Figures 1 and 3 of the article from the files of this deposit alone. The files of version 1, computed with a window one hour wider, are retained for reference. The on-site surface meteorology that drives AERMET is the property of the operators of the eddy-covariance station and is available from them on request. See README.md for the folder structure, the units and the conventions of time.