"Flux data" refers to continuously changing or fluctuating information. It represents data that is constantly being updated or modified over time. Full definition
In this context, Marvel's choice of using OHC data rather than making direct use of the available net flux data from the model runs seems absurd. (climateaudit.org)
Liu, J.P., J.A. Curry, W.B. Rossow, J.R. Key, and X. Wang, 2005: Comparison of surface radiative flux data sets over the Arctic Ocean. (pubs.giss.nasa.gov)
In contrast, closure of the global ocean mean net surface heat flux budget to within 20 W m — 2 from observation based surface flux data sets has still not been reliably achieved (e.g., Trenberth et al., 2009). (skepticalscience.com)