L. K. Shay, J. Martinez-Pedraja , A. B. Parks

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Presentation transcript:

L. K. Shay, J. Martinez-Pedraja , A. B. Parks Application of High Frequency Radar & Okubo-Weiss Parameter to Analyze Variability in the Florida Current Ocean Sciences 2012 Matthew Archer L. K. Shay, J. Martinez-Pedraja , A. B. Parks www.rsmas.miami.edu/users/marcher

[Source: http://oceancurrents.rsmas.miami.edu] Florida Current [Source: http://oceancurrents.rsmas.miami.edu] Gulf Stream IMPORTANCE – MOC/heat transport + wind driven gyre circulation. Previous research focused mainly on explaining this larger scale variability. Loop Current Drifter Trajectories between 1978 - 2003

Florida Current Meanders Cyclonic eddies; Florida Atlantic Ocean ⌐ Bahamas¬ Cuba Florida Keys Cal Say Bank Santaren Channel  Gulf of Mexico NW Providence Channel South Bight Meanders Cyclonic eddies; Tortugas eddies (TE) Frontal eddies (FE) Submesoscale motions… IMPORTANCE – MOC/heat transport + wind driven gyre circulation. Previous research focused mainly on explaining this larger scale variability.

Vortices in the Florida Current Shay et al., 1998; Shay et al., 2000 ; Parks et al., 2009 Shay et al. [1998] ; Shay et al. [2000] ; Parks et al. [2009] Forcing Abrupt wind change Length Scale 2-30 km (cross-shelf) 4-40 km (along-shelf) Translational Velocity 15-40 km/day Rotation -Cyclonic -Dipole excited by near-inertial wave propagation Vortices research

Objectives Using high frequency (HF) radar as tool to monitor the evolution of the Florida Current, for: Oil spill mitigation procedures in the surface layer Search and Rescue (Cuban Rafters) Larvae transport Optimizing commercial shipping interests (i.e. going with the flow) FOCUS To understand the surface current signals associated with energetic vortices to improve real time monitoring across the FC in addressing the above issues.

ADCP mooring (80-m depth) Radar domain Radar Site ADCP mooring (80-m depth) CMAN Buoy

WEllen RAdar (WERA) Specifications Frequency Modulated Continuous Wave (FMCW) System: Chirp Interval: 0.26 sec Operating frequency: 16.045 MHz Range: 80 km Horizontal resolution: 1.2 km Sampling interval: 10 min Flexible: can be altered to sample a few minutes to several hours (e.g. 128, 256, 512……samples in the averaging)

In Florida Current velocities often exceed 200 cm s-1 Accuracy Total radial accuracy ~ 3-5 cms-1 In Florida Current velocities often exceed 200 cm s-1 ADCP Comparison: [14-m bin depth Vs. radar cell] Complex correlation ~ 0.8 ADCP Mooring Adapted from Parks et al. [2009]

Case Study: Submesoscale Vortex January 2005

Spatial Dimensions ~30-km Along-Shelf ≈ 17-km Cross-Shelf ≈ 24-km Peters et al., 2002: Radius of Deformation in the Florida Straits shelf break: ~30-km

= 46 km/day u-component velocity Slope ̴ 66 km/34 hrs Wind Shift Cold Front Wind Shift Adapted from Parks et al., JGR [2009] Wind Stress calculation following Fairall et al., JGR [1996]

Okubo-Weiss (OW) Criterion Based on the eigenvalues of the velocity gradient tensor. Physically it describes the balance between vorticity and deformation: OW = Sn2 + Ss2 - ω2 Normal Strain Shear Strain Vorticity Refer to: McWilliams [1984]; Isern-Fontanet et al. [2003; 2004; 2006] ; Chelton et al. [2007]; Chaigneau et al. [2008]

Application of OW

Application of OW

Application of OW

Summary: Work In progress WERA resolves submesoscale features. Marked bin to bin coherence in the surface signals. Several years of data sensing the FC Regarding implementation of Okubo-Weiss … Jury is still out on using OW given importance of shear and strain along the western flank of the Florida Current and its impact on submesoscale structures. Need to change this – put future work at the very end (or very start) not just in the middle! Frequency analysis to determine forcing mechanisms?

Future Work Subsurface structure from ADCP suggests barotropic nature over the shelf break – relationship to the topography and bottom boundary layer? Relationship to the wind stress field Frequency decomposition Parks et al., JGR [2009]