Greta Leber Rosenstiel School of Marine and Atmospheric Science Student Seminar Presentation: December 1, 2010 Advisor: Dr. Lisa Beal.

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Presentation transcript:

Greta Leber Rosenstiel School of Marine and Atmospheric Science Student Seminar Presentation: December 1, 2010 Advisor: Dr. Lisa Beal

Image Courtesy Dr. Lisa Beal

Average Vertical Spacing: 2m Average Horizontal Spacing: 23km Lowered Acoustic Doppler Current Profiler (LADCP) with Conductivity- Temperature-Depth (CTD) Line 1: LADCP + CTD During Deployment: Less Synoptic: April 7-15 Steamed back for a continuous underway shipboard ADCP section Line 2: LADCP + CTD More Synoptic: April Image Courtesy Dr. Lisa Beal

Images Courtesy Dr. Lisa Beal Agulhas Undercurrent Experiment East London line February-March 2003

Solitary Meander Characteristics (de Ruijter et al, 1999): Downstream velocity ranges from 5 (North) to 20 (South) km day-1, Diameter ranges from km Period between 50 and 150 days. Marine Remote Sensing Unit;

April 7 April 12 Line 1 Diameter: ~100km Velocity: ~15 km day -1 downstream SSALTO/ Data Unification and Altimeter Combination System (DUACS) Real-Time AVISO MADT Product

Line 1Line 2

Line 1Line 2 Northeastward (Undercurrent) Southwestward (Agulhas) Total (Southwestward)

Need a ZVS… commonly:But, we know that the ZVS is V-shaped, so use ZVS from LADCP data: Still no Northeastward (Barotropic Feature)!

 SOLUTION: Demean the Geostrophic Velocity and add Geostrophic Barotropic component from LADCP.

Line 1Line 2

 During the passage of a Solitary Meander, the northward flow strengthens and extends to the surface as a barotropic feature.  Geostrophic velocity is highly sensitive to the choice of a ZVS, with comparison to LADCP barotropic component giving the best results.  Ageostrophic flows in the Agulhas are concentrated in the surface layer.  Next Steps (with the hydrographic data): Investigate structure of ageostrophic flow (Cylostrophic? Ekman? Data artifact?). Continue evaluating meander properties (vorticity, mixing, etc.).

 My advisor, Dr. Lisa Beal.  The crew of the R.V. Knorr  Funded by NSF

Images Courtesy Dr. Lisa Beal

 Largest WBC in the world (Bryden and Beal, 2005)  Large heat and salt transports.  Important inter-ocean link in the Thermohaline Circulation as the so- called ‘warm-water route’ first described by Gordon,  Upstream dynamics have been linked to frequency of ring-shedding events (Lutjeharms and van Ballegooyen, 1988; van Leeuwen et al, 2000). Zahn, 2009

SSALTO/ Data Unification and Altimeter Combination System (DUACS) Real-Time AVISO MADT Product