Observational Data Used for Assimilation in the NCEP North American Regional Reanalysis Perry Shafran 1 , Jack Woollen 1 , Wesley Ebisuzaki 2 , Wei Shi 3 , Yun Fan 3 , Robert Grumbine 4 , Michael Fennessy 5 1 SAIC/GSO and NCEP/EMC, 2 NCEP/CPC, 3 RSIS and NCEP/CPC, 4 NCEP/EMC, 5 Center for Land-Ocean-Atmosphere Studies North American Regional Reanalysis Workshop, 11 January 2005, GAPP
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Observational Data Used for Assimilation in the NCEP North American Regional Reanalysis
GAPP. Observational Data Used for Assimilation in the NCEP North American Regional Reanalysis Perry Shafran 1 , Jack Woollen 1 , Wesley Ebisuzaki 2 , Wei Shi 3 , Yun Fan 3 , Robert Grumbine 4 , Michael Fennessy 5 - PowerPoint PPT Presentation
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Observational Data Used for Assimilation in the NCEP North American Regional Reanalysis
Perry Shafran1, Jack Woollen1, Wesley Ebisuzaki2, Wei Shi3, Yun Fan3, Robert Grumbine4, Michael Fennessy5
1SAIC/GSO and NCEP/EMC, 2NCEP/CPC, 3RSIS and NCEP/CPC, 4NCEP/EMC, 5Center for Land-Ocean-Atmosphere Studies
North American Regional Reanalysis Workshop, 11 January 2005, 85th AMS Annual Meeting, San Diego, CA
GAPP
Introduction
• North American Regional Reanalysis (NARR) assimilated great deal of data
• Data usage– Assimilated in analysis– Boundary conditions– Used during execution of Eta model
• Most data from NCAR/NCEP Global Reanalysis; some data from other sources
Data Used in Global Reanalysis and Regional Reanalysis
Dataset Details Source
Radiosondes Temperature, winds, moisture
NCEP/NCAR Global Reanalysis (GR)
Dropsondes Same as above GR
Pibals Wind GR
Aircraft Temp. and wind GR
Surface Pressure GR
Cloud drift winds Geostationary satellite GR
Radiosonde Data
Precipitation Data Sources
• CMAP used for Oceanic Data– CPC Merged Analysis of Precipitation– Global 2.5 deg dataset, pentads– Disaggregated using R2 precipitation weighting factors– Reliable up to about 50 deg N– Blending of CMAP influence in 15-degree zone over
oceans to eliminate discontinuities– Not reliable in areas of very heavy precipitation (<100
mm/day) or near centers of tropical storms
Precipitation Data Sources
• CONUS precipitation– From 1/8-degree grid– Several sources
• NCDC daily cooperative stations (~8000 reports/day)• River Forecast Center from CPC (~7000/day)• Hourly Precipitation Data (HPD) (~2500/day)
– Analyzed using orographic Mountain Mapper also known as PRISM