TOVS Path-P

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TOVS Path-P
Axel SchweigerPolar Science CenterUniversity of
Washington(Given by Jeff Key, NOAA/NESDIS,
Madison)

• Path-P is a derivative of Path-B with polar
  modifications
• Processed north of 60 N, 1979-2004, 100 km grid,
  daily, monthly
• Temperature and humidity profiles, cloud
  fraction, cloud height

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Current Path-P Activities

• Compilation of Collocation Data Set (1979-2004)
• Radiosondes (multiple data sets)
• EECRA (surface cloud observations, 1979-1996)
• Lidar/Radar cloud obs. from (SHEBA, Barrow, SGP)
• Snow and Ice Charts (NSIDC)
• HIRS/MSU (Brightness Temperatures)
• Area N40 SGP, possible future expansion
• Rework of cloud algorithm
• Adjustment of thresholds, validation
• Additional tests (e.g. 7.2 -11 µm after Liu et.
  al. )
• Recomputation of Radiance Bias Adjustments
• Eventual reprocessing
• Will allow point by point comparison of surface
  cloud observations with HIRS/MSU-derived.

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TPP and APP-X
WinterDJF
SpringMAM
-4 /dec -7/dec
5/dec 4/dec
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TPP and APP-X 1980-2001 (1982-1999)
SummerJJA
FallSON
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APP-X vs. TOVS Path-P JJA, Beaufort Sea
APP-X
TOVS Path-P
(From J. Francis)
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ERA-40 Winter (DJF) Total Cloud Fraction
(1980-2001)
57
01
Trend /decade
12/decade
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ERA-40 and TPP Cloud Fraction Spring (MAM)
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ISCCP D1
TOVS Path-P
Summer
Winter
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ISCCP D1 Clear Sky Composite vs Surface Obs
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