CTD AND XBT TEMPERATURE MEASUREMENT COMPARISON

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CTD AND XBT TEMPERATURE MEASUREMENT COMPARISON

• LT Scott Boedeker

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CTD 10/XBT 4
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REPRESENTATIVE PAIRS
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• For the 27 comparisons from this cruise, the XBT
  temperature has a warm bias of .0882 degrees C
  over the depth range
• This is similar to results obtained from previous
  OC3570 cruises
• The greatest bias was in the upper levels

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CTD-XBT Temp Difference
R/V Point Sur
08/2001 02/2001
07-08/2000 Roth (2001)
Schmeiser (2000)  
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Why the Bias?

• Manufacturing Defects
• Method of deployment

-CTD casts are made nearly vertical with the
vessel stopped. -XBT casts are made with the
vessel in motion and are therefore not as
vertical. This results in the XBT being
shallower than it is recorded.
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Questions?