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A Brief Introduction to CRU, GHCN, NCEP2, CAM3.5

Learn about CRU, GHCN, NCEP2, and CAM3.5 data sets for climate research. Explore anomalies, variables, and resolutions of each dataset to enhance your data analysis skills.

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A Brief Introduction to CRU, GHCN, NCEP2, CAM3.5

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  1. A Brief Introduction to CRU, GHCN, NCEP2, CAM3.5 Yi-Chih Huang

  2. CRU (I) • Gridded dataset produced by the Climate Research Unit at the University of East Anglia • Anomaly method • CRUTEM3 • Land surface temperature anomalies • Monthly since January 1850, on a 5x5 degree grid • HadCRUT3 • A blend of CRUTEM3 and HadSST2 • Monthly since January 1850, on a 5x5 degree grid

  3. CRU (II) • TS3 • Variables: precipitation, wet-day frequency, mean temperature, diurnal temperature range, vapor pressure, sunshine, cloud cover, ground frost frequency • Monthly during 1901~2006 on a 0.5° × 0.5° grid

  4. GHCN • Global Historical Climatology Network • Anomaly Method • Monthly precipitation anomalies 1900-2009 • Monthly temperature anomalies 1880-2009 • 5 X 5 degree grid

  5. NCEP-DOE Reanalysis 2 (I) • Monthly, Daily, Sub-Daily for 1979/1/1 -2008/12/31 • An improved version of the NCEP/NCAR Reanalysis I • Same resolution as N/N Reanalysis: T62 L28 • Same raw observed data • Same dependence of satellite temperature retrievals • Fixed known errors in N/N Reanalysis • S. H. PAOBs • Snow cover • Oceanic albedo • Discontinuities in radiation fluxes

  6. NCEP-DOE Reanalysis 2 (II) • Improved diagnostics • Snow/water budget • Cloud diagnostics field • Winter time precipitation, surface temp and fluxes in high latitudes • Tropical precipitation • Some improvements in the assimilation system • Soil wetness, especially the interannual variations

  7. NCEP-DOE Reanalysis 2 (III) • Possible drawbacks • Overestimates OLR over warm pool • Equatorial upper level moisture much drier over convection area • Summer precipitation rates in Arctic region • Long term spin-down of soil wetness in polar latitudes

  8. CAM3.5 (I) • Community Atmospheric Model • 1.9x2.5 deg / 26 levels • Separates parameterization suite from dynamical core • Slab Ocean Model • Mixed layer temperature • Thermodynamic sea ice model • Snow depth, surface temperature, ice thickness, ice fractional coverage, and internal energy

  9. CAM3.5 (II) • Lin-Rood finite volume dynamic core • Flux-form semi-Lagrangian scheme • Sub-cycling within the 2D Lagrangian dynamics • Deep Convection • Convective momentum transports • Dilute plume calculation • Cloud Fraction • Polar cloud freeze-drying

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