Nowcasting ocean surface currents Madeleine Cahill 19 June 2008 Wealth From Oceans.
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Transcript of Nowcasting ocean surface currents Madeleine Cahill 19 June 2008 Wealth From Oceans.
Nowcasting ocean surface currents
Madeleine Cahill
19 June 2008
Wealth From Oceans
2. June, 2007
• Velocities in excess of 1.5m/s observed just north of NW Cape
• much greater than speeds associated with mesoscale processes in the region
• appear to be related to small-scale vorticies O(20km)
3. Analysis height map and geostrophic velocities May 21 2008
• map of total height
• Infer velocities assuming geostrophy
4. Available height data
• Time and location of available height data can be limiting
5. Height anomaly map May 21,2008 using altimeter and tidegauge height
• High along track resolution but large distances between tracks - determines the length scale of the mapping
• Mapping is constrained at the coast with the tidegauges
6. Height anomaly map including MCC vectors from SST
• Including MCC vectors from Ian Barton
7. 1 day composite SST May 22, 2008
• MCC vectors are associated with northward intrusion of cold water
8. Now add mean height – Ken Ridgway and Andreas Schiller
OFAM – global model, 0.1° resolution in this region.
Bluelink
OFAMFusion
9. May 21 2008 height and geostrophic velocities
10. Right now, June 17, 2008
• Similar conditions to 2007
but small vortex doesn’t appear to be spinning
11. Fusion – OFAM mean
12. Fusion – BRAN
Thank you
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Phone: +61 3 9545 2176Email: [email protected]: www.csiro.au/group
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