The new and improved LLC4320v2 dataset is being transferred to SciServer and transformed for public access under the Kraken domain. The LLC4320v2 run is a global-ocean-ice-river-tides simulation. Like LLC4320, it uses a 1/48° horizontal grid (about 2km grid spacing).
Key features are:
– Newer bathymetry (GEBCO 2025)
– Non-linear free surface and z* vertical coordinates
– Ice shelf cavities based on Bedmachine around Greenland and Antarctica
– 173 (not 90) vertical levels based on global mean WOA23 N2
– Carried out during the NASA SWOT period, i.e., starting in January 2023
– Initial conditions from GLORYS12 followed by llc1080 spin-up
– Hourly atmospheric forcing form ERA5 with Large/Yeager 2009 bulk formulae
– Daily river discharge from JRA55-do followed by GloFAS, including river temperature
– Tidal forcing from JPL’s SPICE library with accurate, online SAL corrections
This configuration fixes many known biases with the original LLC4320 run. Watch this space!