TOVS PathP Axel Schweiger Polar Science Center University
- Slides: 10
TOVS Path-P Axel Schweiger Polar Science Center University 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
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 N 40 + 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.
TPP and APP-X Winter DJF 1980 Spring MAM 2001 1980 -4 %/dec -7%/dec 2001 +5%/dec +4%/dec
TPP and APP-X 1980 -2001 (1982 -1999) Summer JJA 1980 Fall SON 2001 1980 2001
APP-X vs. TOVS Path-P: JJA, Beaufort Sea TOVS Path-P (From J. Francis)
ERA-40 Winter (DJF) Total Cloud Fraction (1980 -2001) 57 Trend %/decade 12%/decade 01
ERA-40 and TPP Cloud Fraction Spring (MAM)
ISCCP D 1 Summer Winter TOVS Path-P
ISCCP D 1 Clear Sky Composite vs Surface Obs
