Comparison of Surface Temperature Measurements

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Comparison of Surface Temperature Measurements

• 28 Jan 2002 04 Feb 2002

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JCOMM Graphic for SST
IGOSS nmc Reyn_SmithOIv1 weekly SST Weekly mean
sea surface temperature (blended from ship, buoy,
and bias-corrected satellite data). USA
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Data Sets

• Bucket Temperature
• Along-Track System
• Hand Held IR Gun
• CTD temperatures at SFC
• AVHRR Imagery from NOAA 12 and NOAA 16.

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Bucket Temperature

• The method was to lower a mercury thermometer
  enclosed in a PCV pipe over the side. The
  thermometer was then brought onboard and read.
• Measured the mixed water. (Within the first
  meter)

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Along-Track System

• This is the sea water injection temperature as
  measured by the Pt Sur.
• Measured the water just below the surface.
  (Within a few meters)

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Hand Held IR Gun

• The procedure was to take a reading of the
  undisturbed water off of the bow of the Pt Sur.

• Next take a reading of the sky directly above.

• These two readings were used to calculate the
  surface temperature.

• Measured the skin temperature. (First few mm
  of the surface)

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CTD temperatures at SFC

• The top temperature of each CTD cast during the
  first leg were collected from the CTD logs.
• Measured water in the first few meters.

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AVHRR Imagery from NOAA 12 and NOAA 16.

• Imagery from NOAA 12 and 16 was analyzed using
  Xview to pull off temperatures that were closest
  to the times and locations of the ship tracks.
• Measured the skin temperature. (First few mm
  of the surface)

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Expectations

• Bucket, Along-Track, and CTD temperatures
  were expected to match well.
• The hand held IR gun and the AVHRR data were
  expected to match well.

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Leg 128JAN02 - 31JAN02
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Leg 201FEB02 - 04FEB02
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Correlations
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Correlations
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Possible reasons for non correlations.

• Leg 1 was very cloudy.
• Seas were rough for leg 1.
• Bucket thermometer was large scale.