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Reanalysis at ECMWF

ERA-15: 1979 – 1993 ERA-40: 1957 – 2001 ERA-Interim: 1989 onwards ORA-S3: 1959 onwards MACC: 2003 – 2010 . Reanalysis at ECMWF. ERA-CLIM: European Reanalysis of Global Climate Observations An EU project to help prepare the next ECMWF reanalysis. ERA-20C: 1900 onwards.

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Reanalysis at ECMWF

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  1. ERA-15: 1979 – 1993 ERA-40: 1957 – 2001 ERA-Interim: 1989 onwards ORA-S3: 1959 onwards MACC: 2003 – 2010 Reanalysis at ECMWF • ERA-CLIM: • European Reanalysis of Global Climate Observations • An EU project to help prepare the next ECMWF reanalysis ERA-20C: 1900 onwards

  2. Plans for new ERA products ERA-CLIM

  3. radiosonde temperature departures, mean and stdv analysis background ERA-40 dark/dashed ERA-Interim light/solid Fit to temperature data in the Arctic (Jan 2000) Reduced bias Improved vertical consistency Improved consistency between background and analysis ERA-Interim achieves similar accuracy but with smaller analysis increments - therefore better consistency across analysis windows

  4. January mean precipitation Precipitation bias (mm/day) for January in several reanalyses relative to GPCP, for the period 1990-2002.

  5. Annual mean precipitation Taylor diagrams of annual mean precipitation from reanalyses using GPCP as a reference and CMAP as an additional observing reference. Each panel shows the statistics for different regions: (a) globe, (b) tropics, (c) global land, and (c) global oceans. The red and blue lines show limits of expected high and low correlation as determined by comparing GPCP and CMAP observations. See Bosilovich et al. (2008) for details.

  6. Global mean precipitation

  7. Decadal change in precipitation rate

  8. 2m Relative humidity anomaly (global land) %

  9. Atmospheric reanalysis: The user base • Many users: • > 10000 registered users via ECMWF public data services • ≳5M fields retrieved daily by ECMWF and Member-State users • National mirror sites for ERA in many countries • And many citations: • Paper on NCEP/NCAR reanalysis is most cited paper in geosciences • Paper on ERA-40 is most cited recently in the geosciences • Many references in IPCC Fourth Assessment report

  10. Reanalysis of atmospheric composition (MACC project) MACC is producing a reanalysis of greenhouse gases, reactive gases, and aerosol for the period 2003 – 2010. Observations from instruments such as MODIS, SCIAMACHY, OMI, MLS, MOPITT, AIRS, IASI, …. Surface CO Column CH4 Aerosol Optical Depth

  11. ERA-CLIM data recovery and digitization focus on pre-1957 meteorological data in sensitive regions

  12. Extracting information from sparse observations 4D-Var analysis of the 500hPa geopotential height surface 0 UTC, 15 February 2005 using all available observations using surface pressure observations only

  13. ERA-Interim reanalysis is continuing near real-time • Products are updated monthly

  14. Climate monitoring facilities Still under development; prototype version on www.ecmwf.int/research/era

  15. ERA-15: 1979 – 1993 ERA-40: 1957 – 2001 ERA-Interim: 1989 onwards ORA-S3: 1959 onwards MACC: 2003 – 2010 Reanalysis data produced at ECMWF • ERA-CLIM: • European Reanalysis of Global Climate Observations • An EU project to help prepare the next ECMWF reanalysis ERA-20C: 1900 onwards

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