Potential Vorticity along CALCOFI Line 67

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Potential Vorticity along CALCOFI Line 67

• LCDR David Ruth
• Winter 2001

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Overview

• Objectives
• Potential vorticity defined
• Method
• Observations
• Conclusions

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Objectives

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

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Potential vorticity defined

• PV ? f?-1d?/dz
• Utility CONSERVATION
• (large-scale circulation)

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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

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Observations
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Conclusions

• Potential vorticity analysis revealing, but not
  intuitive

• Lesson in liberty with data

• SEAWATER library provides excellent
• tools

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QUESTIONS?