Does eddy subduction matter in the northeast Atlantic Ocean

摘要: [1] Mesoscale eddies are an important contributor to subduction in the Gulf Stream region and Antarctic Circumpolar Current, but is eddy also relatively quiescent interior of world's subtropical gyres? Observations from Subduction Experiment northeast Atlantic do not have spatial resolution necessary calculate answer this question. Regional numerical models can diagnose subduction, their representativeness unknown. Furthermore, water mass budgets open-ocean domain show that simulated properties subducted directly depend upon uncertain open-boundary conditions surface fluxes. To remedy these problems, a state estimate ocean circulation formed by constraining eddy-permitting general model observations adjusting parameters within uncertainty. The resulting self-consistent with equations motion has for diagnosing subduction. In during 1991–1993, time-variable contributes less than 1 Sv net while total 4 Sv. Eddy volume fluxes 40 m/yr North Equatorial Current Azores however, significant rival Ekman pumping locally. at 1/6° 2–3 more density bands centered around σ = 24.0 kg/m3 26.0 2° estimate. This result implies inability accurately simulate mesoscale phenomena climate would lead accumulation errors over 10–20 years, even gyre.