Access and visualization of theTwentieth Century Reanalysis dataset

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Presentation transcript:

Access and visualization of theTwentieth Century Reanalysis dataset Gilbert P. Compo, Cathy Smith, Jeffrey S. Whitaker, and Prashant D. Sardeshmukh compo@colorado.edu Univ. of Colorado/CIRES Climate Diagnostics Center and NOAA Earth System Research Laboratory/PSD Compo, Whitaker, Sardeshmukh 2006 Special thanks to N. Matsui, R. Vose, R. Allan, S. Woodruff, NCEP/EMC

Requires international cooperation, e.g., Advances and Improvements towards Surface Input Reanalysis for Climate Applications (SIRCA) 19th-21st centuries More land and marine observations back to early 19th century, especially S. Hemisphere. Tailoring of reanalysis products, e.g., downscaling User requirements for, and applications of, reanalyses Verification and Validation of reanalysis products Higher resolution, improved methods, other surface variables (e.g., wind, T, Tropical Cyclone position) Requires international cooperation, e.g., Atmospheric Circulation Reconstruction over the Earth http://www.met-acre.org

Current and future International Surface Pressure Databank station component (1670 to 2009) ftp://ftp.ncdc.noaa.gov/pub/data/ispd/add-station Courtesy X. Yin and R. Allan

Reanalysis Dataset Current and Planned Access 20th Century Reanalysis Project Data Access: Analyses and ISPD (with feedback) will be freely available from NCAR, NOAA/ESRL and NOAA/NCDC. Spring 2009: version 1 1908-1958 (complete, more data being added online) http://www.esrl.noaa.gov/psd/data/gridded/data.20thC_Rean.html (NOAA ESRL) http://dss.ucar.edu/datasets/ds131.0 (NCAR) Fall 2009: version 2 1891-2006 (including time-varying CO2, aerosols, upgraded GFS from NCEP) ftp://ftp.cdc.noaa.gov/Public/gcompo/ (NOAA ESRL) Spring 2010: version 2 1871-2008 http://dss.ucar.edu/datasets/ds131.1 (NCAR) http://nomads.ncdc.noaa.gov (NOAA NCDC) Coordinate with PCMDI CMIP5 distribution and validation for IPCC AR5

500 hPa Geopotential Height Northern Hemisphere Ensemble Mean Analysis and Spread 15 December 1891 00UTC www.cdc.noaa.gov/data/20thC_Rean/ SLP 15 December 1891 500 hPa GPH Note uncertainty changes, polar regions early on. mb m Sea Level Pressure 500 hPa Geopotential Height Contours- ensemble mean Shading- blue: more uncertain, white: more certain

20th Century Reanalysis Project Homepage http://www. cdc. noaa

http://www.cdc.noaa.gov/data/20thC_Rean/

Monthly mean composites (beta) http://www.cdc.noaa.gov/cgi-bin/data/composites/plot20thc.pl Plotting page courtesy Cathy Smith (U. of Colorado CIRES and NOAA ESRL PSD) Daily means are also available

Comparison of El Nino composite of 300 hPa Geopotential Height from January to March (1952+1958) – (1951+1957) NCEP/NCAR Reanalysis 20th Century Reanalysis The overall patterns are very similar. 20th Century reanalysis data appears to have stronger signals in extratropics of both hemispheres, weaker signals in Tropics.

Monthly mean composites on Google Earth http://www. cdc. noaa

Monthly mean composites on Google Earth

Thank you Questions? Contact : Jeffrey.S.Whitaker@noaa.gov compo@colorado.edu

Higher resolution example of Surface Input Reanalyses for Climate Applications (SIRCA)

2008 NCEP GFS at ~50km resolution September 1938 New England (movie) T254L64 (~50 km) Is the extraordinary upper-level trough correct?

2008 NCEP GFS at ~50km resolution 21 September 1938 00 UTC Sea Level Pressure 500 hPa geopotential height Is the extraordinary upper-level trough correct?

Any Skill Forecasting the Track? 36 hour forecast verifying 21 Sept 1938 18Z Ensemble Forecast HURDAT Track using 56 ensemble members T254L64 (about 0.5 degree)