1. What are we seeing in the surface currents?
LCDR Jillene Bushnell
OC3570 Operational Oceanography
Winter 2009

2. California, Davidson, or Eddie?

3. Data Collection Methods
ADCP from the MBARI M1 and M2 Moorings, and hull mounted on the Pt Sur
Lagrangian surface drifter, Glider, CODAR, Regional NCOM model

4. Leg One N CRUISE REPORT—OC3570, 29 January – 4 February 2009
1. Stations occupied: (+ indicates oxygen sampling)
Depart 1806Z on 29 January Begin Leg I.
Station Position Depth (dbar) Time (UTC) Comments
January 29, 2009
CTD failed
CTD
January 30, 2009
Glider Deploy
Drift Deploy
Drift Deploy
Drift Deploy
CTD B5
CTD B10
CTD F13/
CTD E13/
CTD D13/
CTD D14/
CTD E14/
HARP Recovered. N

5. MBARI Mooring Locations
Mooring Name
Decimal Latitude
Decimal Longitude M1
36.75 M2
36.70

6. Feb 1 N
Jan 29
Jan 30
Jan 31

7. N

8. Hourly Averaged Hull Mounted ADCP
Jan 29
Feb 1
Jan 30
Jan 31 N

9. current data from MBARI mooring M1
 MBARI Mooring ADCP

11. Drifters Morning of Jan 30th sent off drifters

12. Feb 1 N
Jan 29
Jan 30
Jan 31
N, W and N, W

13.      I think the glider can yield a useful set of average currents for the upper 200 m by calculating the difference between the observed position and the dead reckoning position----that is actually the way you would measure current set and drift for a ship.   Note that the glider was programmed to glide between the two east-west points ( N, W and N, W) and the variability of its track must have been due to the currents it encountered.
Glider Jan 30th

14. 30- red
31 – blue
1 – green
2 – brown
3 – black
4 - yellow

15. Feb 1 N
Jan 29
Jan 30
Jan 31
N, W and N, W

16. http://www7320. nrlssc. navy. mil/ccsnrt/ArchiveGen_5dMODIS_h002e995
9 km regional model
Counterclockwise Jan 26-30, 27-3, and 28-Feb 1 model run

17. CODAR
Clockwise eddie activity?!; closed trajectory; From cross to spot M M

18. CODAR
Clockwise eddie activity?!; closed trajectory; From cross to spot M M

19. CODAR http://cencalcurrents.org/
CODAR working sites: start of cruise works well until 1100Z Jan 30th, then goes down to 2 sites, then 1 site starting 2300Z on 31 Jan

20. CODAR
Clockwise eddie activity?!; closed trajectory; From cross to spot M M

21. Rossby Number Rossby Number approximately 0.005 U/Lf
U = swirl velocity; average speed (10 cm/s)
L = length scale; radius of eddy (20 km)
f = coriolis ( s-1 )
Rossby Number approximately 0.005

22. Questions