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GV for Snowfall Retrieval Research

Environment Environnement Canada Canada. GV for Snowfall Retrieval Research. David Hudak Paul Joe. 2nd International GPM Ground Validation Workshop, 27-29 September, Taipei, Taiwan. 2477. All active Synoptic Stations north of 50 N. Ref: WMO Publication No. 9 Volume A.

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GV for Snowfall Retrieval Research

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  1. Environment Environnement Canada Canada GV for Snowfall Retrieval Research David Hudak Paul Joe 2nd International GPM Ground Validation Workshop, 27-29 September, Taipei, Taiwan

  2. 2477 All active Synoptic Stations north of 50 N Ref: WMO Publication No. 9 Volume A 29 Oct 2001

  3. POSS Occurrence(1 minute data) YEV=Inuvik 68°N YUL=Montreal 45°N • Surface obs • Doppler XBand • Derived Snowrates • Minutely • Snow only • Typed by observer • 1 winter of data

  4. Vertical Profile Analysis Fort Simpson (62°N) Montreal (45°N)

  5. Quantifying Snow Gauge Errors Systematic errors: • WIND (temperature) • wetting loss • evaporation loss • non-zero trace • capping of gauge orifice • blowing snow Goodison et al

  6. WMO Intercomparison Study Results Catch Efficiency vs Wind for the 4 most widely used gauges

  7. Precipitation Occurrence Sensing System (POSS) • XBand • Bistatic • Continuous Wave • Doppler • Mie Scattering • Terminal Velocity

  8. POSS Research Applications Quantitative Precipitation Estimation (QPE) Under over • Solid precipitation rate validation using the Double Fence Intercomparison Reference (DFIR)

  9. POSS Research ApplicationsQPE Snow Density

  10. 1 minute snow water equivalent precipitation rate 4 A I R S 2 M i r a b e l S n o w E n d i n g : 0 3 1 2 1 8 0 0 : 0 0 ) 1 O b s e r v e r t o t a l a m o u n t = 4 . 8 m m - h m H o t P l a t e 1 ( 5 . 2 3 m m ) m H o t P l a t e 2 ( 4 . 6 9 m m ) ( e P O S S ( 5 . 1 8 m m ) t a 3 r n o i t a t i p i c e r p t 2 n e l a v i u q e r e t a w 1 l l a f w o n S 0 18:00 19:00 20:00 21:00 22:00 23:00 0:00 T i m e Hot plate insensitive POSS Research ApplicationsAirport Vicinity Icing and Snow Advisor (AVISA) NCAR/DRI Hot Plate

  11. 10m met tower Radiation sensors Visibility meter Ceilometer X-band Radar HotPlates Penn State Spectrometer POSS Univ. of Alaska W-band Radar Wind Profiler MW Radiometer McGill Univ. Video Disdrometer Centre fo Atmospheric Research Experiments EC field project deployment suite

  12. NRC Airborne W/X – band radar (NAWX) • Fully Polarimetric and Doppler • W-band: Five ports – Electronic switching • X-band: Two ports - Electronic switching • W-band: • Nadir and Vertical-up: Z, LDR, Vd • Vertical-up – side: Polarimetric, Vd • Nadir-Side: Polarimetric, Doppler • Nadir – Nadir-aft – Dual-Doppler • Side – Side-forward – Dual-Doppler • X-band: • Nadir and vertical-up – Single polarization • Side - Polarimetric

  13. Under-wing particle probes CONVAIR-580 CLOUD MICROPHYSICS (cntd) Standard PMS 2D Imagery 6400 um 800 um

  14. POSS Research ApplicationsPrecipitation TypingDoppler Spectral Mode Analysis RAIN SNOW Mixed SNOW & RAIN

  15. King City C-band Dual Polarized radar Correlation Coefficient ρhv ZR-IP- S YKF YHM

  16. C-band Polarization parameters Correlation Coefficient ρhv Reflectivity Z Specific Differential Phase kdp Differential Reflectivity ZDR

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