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Eddy Hildebrand HRD Research Report 10 July 2009

Validation of Atmospheric Infrared Sounder (AIRS) Data Using GPS Dropsondes in Tropical Cyclone Environments. Eddy Hildebrand HRD Research Report 10 July 2009. Atmospheric Infrared Sounder - AIRS. Aboard Aqua satellite launched in May 2002 2378 spectral channels

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Eddy Hildebrand HRD Research Report 10 July 2009

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  1. Validation of Atmospheric Infrared Sounder (AIRS) Data Using GPS Dropsondes in Tropical Cyclone Environments Eddy Hildebrand HRD Research Report 10 July 2009

  2. Atmospheric Infrared Sounder - AIRS Aboard Aqua satellite launched in May 2002 2378 spectral channels Expected performance ability (Tobin et al. 2006): Temperature – 1K RMS differences in 1km layers RH – 20% in 2km layers Vertical profiles ~50km horizontal resolution with 28 vertical levels (Wu et al. 2006) Compare this data with NOAA/HRD dropsonde data from each TC Courtesy: www.nasa.gov

  3. Tracking the SAL • IR and microwave satellites – e.g. GOES, Meteosat • Twice-daily weather balloons – sparse coverage • Aircraft measurements in and around TCs

  4. All 3 storms (Irene, Debby, Helene) combined – 50 sondes, 123 AIRS profiles • Greatest differences around 850 hPa – lots of variability in moisture here

  5. All Non-SAL profiles – 5 sondes, 16 AIRS profiles (not a whole lot of non-SAL sondes to begin with, plus some did not have any AIRS matches) • AIRS does OK (within 10-15% of sonde RH) except around 600mb.

  6. All SAL sondes – 35 sondes, 84 AIRS profiles • AIRS shows a greater decrease in moisture with height near the SAL base • AIRS also carries dry mid-level air further down than what the sondes show • Slight AIRS moist bias in mid-levels

  7. Drop 2 from Helene 16 Sep 2006 • SAL base ~850-900 hPa • Dry all the way to 200 hPa

  8. Irene 7 Aug 2005 – Drop 20

  9. Future Work More accurate to compare one AIRS match or an average of AIRS matches to a given dropsonde? Does AIRS performance vary with different layers of the troposphere? Calculate TPW for each AIRS granule Compare with TPW calculated from dropsonde profiles Compare with other TPW measurements (AMSR-E) Expand to the entire N.H. tropical Atlantic PDF of AIRS mixing ratio 2002-present PDF of dropsonde mixing ratio 2002-present Is AIRS better/worse in each quadrant of a TC? Life cycle of TC?

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