Recent development of the Met Office operational ocean forecasting system: an overview and assessment of the new Global FOAM forecasts

摘要: Abstract. The Forecast Ocean Assimilation Model (FOAM) is an operational ocean analysis and forecast system run daily at the Met Office. FOAM provides modelling capability in both deep coastal shelf sea regimes using NEMO (Nucleus for European Modelling of Ocean) model as its dynamical core. Deep suite produces analyses 7-day forecasts tracers, currents ice global 1/4° resolution. Satellite situ observations temperature, salinity, level anomaly concentration are assimilated by each day over a 48 h observation window. configurations have recently undergone major upgrade which has involved implementation new variational, first guess appropriate time (FGAT) 3D-Var, assimilation scheme (NEMOVAR); coupling to different, multi-thickness-category, (CICE); use coordinated ocean-ice reference experiment (CORE) bulk formulae specify surface boundary condition; increased vertical resolution model. In this paper introduced details recent changes provided. Results presented from 2-year reanalysis integrations Global configuration including assessment short-range accuracy. Comparisons made with previous non-assimilative system. Assessments reveal considerable improvements near-surface fields. However there some degradation sub-surface tracer fields equatorial regions highlights specific areas upon focus future improvements.