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Snow Analysis for CFSRR. George Gayno, Jack Woollen, Ken Mitchell, Bob Kistler. FIRST CFSRR ADVISORY BOARD MEETING 7-8 NOVEMBER 2007. Background. Current GFS OPS updates snow pack once per day (00z). SNO2MDL program maps NESDIS IMS and AFWA snow analysis data to physics grid.

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snow analysis for cfsrr

Snow Analysis for CFSRR

George Gayno,

Jack Woollen,

Ken Mitchell,

Bob Kistler

FIRST CFSRR ADVISORY BOARD MEETING

7-8 NOVEMBER 2007

background
Background
  • Current GFS OPS updates snow pack once per day (00z).
    • SNO2MDL program maps NESDIS IMS and AFWA snow analysis data to physics grid.
    • Output from SNO2MDL ingested by SFC-CYCLE program.
      • Snow updated on model grid via direct replacement.
  • CFSRR will follow similar procedure.
nesdis ims data
NESDIS IMS Data
  • IMS – Interactive Multisensor Snow and Ice Mapping System.
    • NESDIS-SSD analyst uses satellite imagery and snow detection algorithms to determine snow cover over NH once per day.
    • Cover is yes/no flag.
    • 4 km resolution since Feb. 2004.
    • Product started Feb. 1997 (23 km resolution).
    • NIC in Suitland assumes responsibility for IMS starting Feb. 2008.
afwa snow depth data
AFWA Snow Depth Data
  • AFWA SNODEP model produces global snow depth analysis once per day (47 km resolution).
    • Uses microwave-based detection algorithms, in-situ reports of snow depth, and its own climatology.
    • Analyst adjusts analysis based on satellite imagery in NH each day and in SH twice per week.
  • Product has long history. Data available for all years of CFSRR.
    • 1979-1998 acquired from NCDC by Mike Fennessy (COLA), who Gribbed it with help from EMC.
      • EMC filled some gaps and removed several “bad” analyses.
    • 2002 to present in Air Force non-grib format used in present ops (via EMC archive of Jesse Meng)
    • 1999-2001 extracted from NCO run history files.
sno2mdl program
SNO2MDL Program
  • Maps IMS and AFWA snow data to any GFS (or NAM) grid.
  • Structured around IPOLATES interpolation libraries.
    • Nearest neighbor or “budget” interpolation only.
  • If IMS indicates >50% coverage, depth set to the greater of AFWA value or 2.5 cm.
  • If IMS not available, depth set from AFWA data.
  • Will be run as pre-processing step to create T382 snow data for all days in CFSRR period.
  • If IMS and AFWA data missing, model will “cycle” the snow depth.
    • Happened for about 65 days through period.
more information
More Information
  • Current IMS, AFWA, and GFS snow data may be viewed at:
  • http://www.emc.ncep.noaa.gov/jcsda/ggayno/home.html
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