OC4C-SCOPE UExP-FNN-U full surface ocean carbonate system

OC4C/SCOPE UExP-FNN-U full surface ocean carbonate system Changelog Version Changes since previous version v2024-5 Added aragonite saturation state and uncertianties to published file. Added subskin and skin temperature and salinities to published file. Verification of pH and DIC against independent in situ observations from GLODAPv2.2023 (Lauvset et al. 2023) and from SNAP-O-CO2-1 (Metzl et al. 2024). Prior versions Included initial testing of the adding SOM-FNN Total Alkalinity approach to the UExP-FNN-U fCO2sw and air sea CO2 fluxes (as submitted to the Global Carbon Budget 2024; Ford et al. 2024). Iterative refinements of Total Alkalinity approach. Addition of further in situ TA observations to constraint FNN parituclarly in the Baltic Sea (Sharkweb) and the ingestion of the SNAP-O-CO2-v1 (Metzl et al. 2024). Extension to full surface carbonate system with pyCO2sys (Humphreys et al. 2022). Added hybrid tiered salinity dataset approach as described in Gregor et al. (2024). This includes the CCI-SSS v4.41 (Boutin et al. 2022), falling back to the CMEMS GLORYS12V1 reanalysis when not avaiable (Jean-Michel et al. 2021) Implementation of comprehensive uncertainities on the carbonate system components based on the BIPM (2008) principles, and following the Ford et al. (2024) approaches.