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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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