As discussed with @mzamyatina, there's a bug in the calculation of the day-night average of the transmission flux, output by the UM. Currently, the averaging function makes one of the flux arrays (e.g. day) mismatch the other (e.g. night), making the average flux higher than individual (day- or night-only) fluxes.
As discussed with @mzamyatina, there's a bug in the calculation of the day-night average of the transmission flux, output by the UM. Currently, the averaging function makes one of the flux arrays (e.g. day) mismatch the other (e.g. night), making the average flux higher than individual (day- or night-only) fluxes.
Possible solutions are either