An updated cloud-overlap photolysis module for atmospheric chemistry models, UCI Cloud-J v8.0, with near-UV H2O absorption

This new data set (Cloud-J v8.0) includes near-UV cross sections for water vapor absoprtion that can be used to calculate photolysis rates in atmospheric chemistry models using the new photolysis code UCI Cloud-J version 8.0. This data set and the code that uses it are updated and improved versions of the last published version 7.6c (Prather, Michael; Hsu, Juno, 2019, Solar-J and Cloud-J models version 7.6c, Dryad, Dataset, https://doi.org/10.7280/D1096P). It cleans up some minor bugs (see notes) and now includes the option for water vapor absorption in the ultraviolet region 290-340 nm. The new H2O cross sections are derived from Pei et al. (2019, Water vapor near‐UV absorption: Laboratory spectrum, field evidence, and atmospheric impacts. JGR-Atmos, 124, 14,310–14,324. doi: 10.1029/2019JD030724). With these new H2O cross sections, more solar UV is absorbed in the lower atmomsphere and many major photolysis rates are reduced by 10% near the surface. We estimate that the lifetime o..., The dataset was taken directly from the Pei et al. 2019 published tables and then re-mapped onto the Cloud-J wavelength bins., The primary dataset (FJX_spec.dat) can be opened and read with any editor. The use of this data to calculate photolysis rates (J-values) requires the Cloud-J v8.0 FORTRAN F90 source code and a FORTRAN compiler. No special libraries are needed. A standalone version of the code and necessary data tables are provided in the Zenodo software archive linked to this Dryad data DOI.