1. Potential Vorticity along CALCOFI Line 67
LCDR David Ruth
Winter 2001

2. Overview Objectives Potential vorticity defined Method Observations
Conclusions

3. Objectives
Compute potential vorticity along CALCOFI Line 67 using cruise data from 4-8 December 2000
Evaluate output: explain apparent features

4. Potential vorticity defined
PV  fρ-1dρ/dz
Utility: CONSERVATION
(large-scale circulation)

5. Method Data collection - 20 CTD stations along Line 67 sampled to
1000 dbar at 2 dbar intervals
- ADCP data down to 400m
Data analysis
- MATLAB 5.3
- Hanning filter for smoothing
- SEAWATER library routine to compute potential vorticity

6. Line 67 stations

7. Observations

9. Density anomaly

14. Conclusions Potential vorticity analysis revealing, but not intuitive
Lesson in “liberty” with data
SEAWATER library provides excellent
tools

15. QUESTIONS?