Mass Transport Streamfunction from a 1/16 1

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Mass Transport Streamfunction from a 1/16 1 Mass Transport Streamfunction from a 1/16 1.5 layer linear simulation forced by the smoothed Hellerman-Rosenstein wind stess climatology plus the northward upper ocean flow of the meridional overturning circulation Sverdrup (1947) interior flow with Munk (1950) western boundary layers Observed mean IR north wall pathway (1982-1996) +/- 1 std. dev. by Cornillon and Sirkes (from Hurlburt and Hogan, 2008, DAO) Model domain used for 5-layer nonlinear hydrodynamic simulations by the NRL Layered Ocean Model (NLOM) in Hurlburt and Hogan (2000, DAO; 2008, DAO)

Gulf Stream Separation from the Coast Roles of the DWBC and the Eddy-Driven Abyssal Circulation From Hurlburt and Hogan (2008, DAO) Mean sea surface height forced by Hellerman and Rosenstein (1983) wind stress and meridional overturning northward upper ocean flow. Observed mean IR north wall pathway (1982-1996) by Cornillon and Sirkes

Abyssal Current Steering of Upper Ocean Current Pathways

Simulated mean abyssal currents in the Gulf Stream region Model layer 5 with the Cornillon-Sirkes mean Gulf Stream IR northwall frontal pathway overlaid ( ). DWBC is most easily seen paralleling the northern boundary north of 41N, 65W-51W (left panels vs right panels). From Hurlburt and Hogan (2008, DAO)

Mean abyssal currents from 1/32 eddy-resolving and 1/8 eddy-permitting simulations in the Gulf Stream region Zoom of 1/32 simulation with CB=.002 and a DWBC 1/32 1/8 Box outlines zoom region used in left panel Abyssal layer = model layer 5 Overlaid on full amplitude uncompressed depth contours Cornillon-Sirkes mean Gulf Stream IR northwall frontal pathway ( ) From Hurlburt and Hogan (2008, DAO)

26-month mean currents observed by a current meter array in the Gulf Stream region near 68W Abyssal currents From Johns et al. (1995, JGR-O)

Mean current meter velocities 100-300 m off the bottom from historical measurements The measurement record lengths vary from 4 mo. to 2 yrs, and the box associated with each vector gives the uncertainty of the mean, typically 1-2 cm/s. From Pickart and Watts (1990, JMR).

Mean abyssal currents (arrows) from 1/32 simulation with CB= Mean abyssal currents (arrows) from 1/32 simulation with CB=.002 and a DWBC overlaid on full amplitude, uncompressed topographic contours And mean depth at the base of the thermocline And Eulerian mean abyssal layer relative vorticity Mean depth of the model interface between layers 4 and 5 Abyssal layer = model layer 5 Cornillon and Sirkes mean Gulf Stream IR northwall frontal pathway ( ) From Hurlburt and Hogan (2008; DAO)

Quasi-contemporaneous along-track SSH variability from satellite altimeter data in 4 orbits in the Gulf Stream region Overlaid on topographic contours From Hurlburt and Hogan (2008, DAO), provided by Gregg Jacobs (NRL)

Original CAV trajectory reference: C.-G. Rossby (1940, QJRMS)

CAV trajectories ( ) vs. model mean Gulf Stream velocity axis ( ) and mean SSH contour nearest the axis ( ) Overlaid on model mean SSH variability and the Cornillon-Sirkes mean Gulf Stream IR northwall frontal pathway ( ) From Hurlburt and Hogan (2008, DAO)

Mean abyssal currents (arrows) from 1/32 simulation with CB= Mean abyssal currents (arrows) from 1/32 simulation with CB=.002 and a DWBC overlaid on full amplitude, uncompressed topographic contours and mean depth of the base of the thermocline Mean depth of the model interface between layers 4 and 5 Cornillon and Sirkes mean Gulf Stream IR northwall frontal pathway ( ) From Hurlburt and Hogan (2008; DAO)