1. GODAE Final Symposium Ocean Briefings Real-time Ocean Brief North West Atlantic Contributors: Naval Research Laboratory Mercator-Ocean Fisheries and Oceans Canada

2. GODAE Final Symposium Ocean Briefings Mercator: 1/12˚ Atlantic and Mediterranean (PSY2V3) Runs once per week, creates a 2-week forecast HYCOM: 1/12˚ global, pre-operational Runs daily: 5-day hindcast and 5-day forecast* C-NOOFS: 1/4˚ Northwest Atlantic, quasi-operational Runs daily, creates a 5-day forecast * Currently HYCOM’s slot has been reduced and the system does not have enough time to run up to the nowcast

3. GODAE Final Symposium Ocean Briefings ‘Events’ of interest Gulf of Mexico: deep Loop Current penetration with the potential for an eddy shedding event (Mercator) Gulf Stream: HYCOM’s performance of this western boundary current Labrador Sea: southward advection of cold water at shallow depths and extreme temperature gradient (C-NOOFS)

4. GODAE Final Symposium Ocean Briefings 1/12˚ HYCOM SSH with drifting buoys overlaid Animation from 10 October – 8 November 2008; only temperature assimilated from drifting buoys

5. GODAE Final Symposium Ocean Briefings Gulf of Mexico: Imminent eddy shedding event? 1/12˚ Mercator SSH analyses 15 Oct 2008 - analysis 22 Oct 2008 - analysis 29 Oct 2008 - analysis 5 Nov 2008 - analysis

6. GODAE Final Symposium Ocean Briefings Gulf of Mexico: Imminent eddy shedding event? 1/12˚ Mercator SSH analyses 5 Nov 2008 - analysis 1 week forecast valid 4 Nov 2008 2 week forecast valid 4 Nov 2008

7. GODAE Final Symposium Ocean Briefings 5 Nov 2008 - analysis Gulf of Mexico: Imminent eddy shedding event? 1/12˚ Mercator SSH analyses 1 week forecast valid 12 Nov 2008 2 week forecast valid 19 Nov 2008

8. Observations assimilated into HYCOM via NCODA 9 October – 8 November 2008

9. GODAE Final Symposium Ocean Briefings Gulf Stream HYCOM SST with independent IR frontal analysis overlaid Frontal analysis < 4 days old = white, analysis ≥ 4 days old = black

10. GODAE Final Symposium Ocean Briefings Gulf Stream HYCOM SST with independent IR frontal analysis overlaid 20 Oct 200826 Oct 2008 28 Oct 2008 30 Oct 2008

11. GODAE Final Symposium Ocean Briefings Labrador Sea C-NOOFS temperature and currents at 00 m 30 October 2008

12. GODAE Final Symposium Ocean Briefings 30 October 2008 Very sharp subsurface temperature gradient Labrador Sea C-NOOFS temperature and currents at 50 m

13. GODAE Final Symposium Ocean Briefings Labrador Sea Available profiles Identified a cluster of XBTs taken in the vicinity of the sharp subsurface temperature gradient Can we use these to verify this phenomenon?

14. GODAE Final Symposium Ocean Briefings Labrador Sea XBTs (red) compared to GDEM3 climatology (green) 51.88˚ W, 43.47˚N52.65˚ W, 44.05˚N 01510520˚C01510520˚C 0 80 40 60 20 0 80 40 60 20

15. GODAE Final Symposium Ocean Briefings Acknowledgements