The GloSea5 Ocean and Sea Ice Analysis with Global Ocean 5.0
Abstract:
Besides its use in a leading edge seasonal forecast system, this ocean and sea ice re-analysis is an important tool in the estimations of past ocean states. The GloSea5 ocean and sea ice analysis participated in the GSOP/GODAE ocean re-analysis intercomparison project (ORA-IP) and continues to be active in other ocean analysis projects such as the evaluating ocean synthesis EU-COST action (EOS-COST).
Since February 2015, the operational version of GloSea5 has used the joint NERC/Met Office global ocean 5.0 (GO5.0) and global sea ice 6.0 (GSI6.0) version of the ocean and sea ice analysis based on NEMO/CICE. In addition to improvements in turbulent kinetic energy vertical mixing schemes used in this version of NEMO, additional improvements have been made to the albedo and surface roughness parameters used in CICE. The NEMOVAR assimilation scheme has also been updated to include two length scale background error covariances to better represent the sparse profile observations in the analysis.
Here we will present some results from the GloSea5 ocean and sea ice analysis, GO5.0/GSI6.0, demonstrating some of the improvements of the system over past versions. In particular, its performance in observing the variability of the heat and salt content of the ocean, surface fluxes, the Atlantic meridional overturning, and meridional heat transport will be amongst the characteristics presented.