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 of methane will increase by 7%. Note (30 May 2023). An error in the calculation of Ice Water Path [IWP(L)] in the standalone driver code for Cloud-J versions 7.6 through 8.0 has been discovered. This does not affect any of the results or example output archived here because the calculations of with and without UV H2O absorption were done with clear skies. A corrected version 8.0c is posted. The corrected code line goes from "IWP(L) = 1000.d0*WIC(L)*PDEL*G100 / CLF(L)" to "IWP(L) = 1000.d0*WIC(L)*PDEL*G100"

本数据集（Cloud-J v8.0）涵盖了水汽近紫外吸收截面，可依托新版光解代码UCI Cloud-J 8.0版，用于大气化学模式中的光解速率计算。本数据集及配套代码为上一公开版本7.6c的更新优化版本（Prather, Michael; Hsu, Juno, 2019, Solar-J与Cloud-J模型7.6c版，Dryad数据集，https://doi.org/10.7280/D1096P）。本版本修复了部分细微漏洞（详见注释），新增了290~340 nm紫外波段的水汽吸收计算选项。本次新增的水汽吸收截面源自Pei等人2019年的研究成果（Water vapor near‐UV absorption: Laboratory spectrum, field evidence, and atmospheric impacts. JGR-Atmos, 124, 14310–14324. doi: 10.1029/2019JD030724）。依托该新增水汽吸收截面，低层大气可吸收更多太阳紫外辐射，地表附近多数主要光解速率将降低10%。我们估算甲烷的大气寿命将提升7%。注释（2023年5月30日）：现已发现Cloud-J 7.6至8.0版独立驱动代码中冰水路径[IWP(L)]计算存在错误。该错误不影响本仓库中已归档的所有结果与示例输出，因为此前开展的有无紫外水汽吸收的对比计算均以晴空为条件。现已发布修正后的8.0c版本。修正后的代码行从`IWP(L) = 1000.d0*WIC(L)*PDEL*G100 / CLF(L)`变更为`IWP(L) = 1000.d0*WIC(L)*PDEL*G100`