Altimetric assimilation with water property conservation

摘要: A simple method for assimilating surface pressure data into a 21-level, eddy-resolving Cox model in double-gyre configuration [see Cox, 1985] is introduced. conservation principle used to derive the new water column structure based on rearrangement of preexisting masses. This respects long timescales required modify properties deeper isopycnals, while still allowing immediate changes isopycnal geometry and associated currents. Water columns are displaced vertically by an amount which reduces update zero at bottom. Current updates then calculated geostrophically. An identical twin experiment performed 1 year with complete assimilated every 9 days. Thermocline temperature current errors decrease rapidly after single assimilation pressure. Errors subthermocline currents potential vorticity (stratification) within thermocline only integration. Deep (3000 m) RMS are, year, reduced up 60%. mixed layer scheme added procedure account better near (where property less realistic). Assimilation, both provided, also described. Surface have biggest impact circulation where deep, e.g., subtropical gyre or far north, although it does not contribute much over alone. We speculate that will more temporally varying boundary conditions, influences subducted thermocline. should be easy implement any framework can modified incorporate error analysis use real sets.