In this page, the following ERA-CLIM2 related material is presented:
  1. The ERA-CLIM2 project time-line
  2. ERA-CLIM2 in numbers
  3. Reanalyses resources (web sites)
  4. The European Union Framework-7 (EU-FP7) sisters's projects in reanalysis

1. The ERA-CLIM2 project time line:
  • 1 January 2014 - The official start date of the project; the project should last 3 years, and end on 31/12/2016.
  • February 2014 - The official kick-off meeting for the ERA-CLIM2 project took place at ECMWF in Reading, UK on 24-25/02/2014. Representatives from all sixteen institutions comprising the ERA-CLIM2 consortium were present at the meeting;
  • April 2014 - The First General Assembly is held at ECMWF. Work plans are drawn and agreed among the participants.
  • August 2014 - An internal workshop on quality control of upper-air observations was held in Bern on 27 Aug 2014, involving participants of work packages 3 and 4; this short meeting was focused on evaluation of ERA-CLIM data rescue and reanalysis outputs, as a starting point for further activities in ERA-CLIM2.
  • September 2015 - The project is extended by 1 year, to 31/12/2017. Initially, ERA-CLIM2 was supposed to last 3 years, but following a request from the project's coordinator and work-package leaders in 2015, the EU has agreed to extend the project by one year to 31/12/2017.The main reasons behind the extension's request were: (a) to be able to deliver a prototype coupled analysis system to the Copernicus Climate Change Services (C3S), and thus transfer ERA-CLIM2 R&D outcomes into pre-operational and eventually operational phases of C3S; and (b) to be able to complete as many deliverables as possible, including quality-controlled CERA-20C and CERA-20C/Carbon data, and a few years of CERA-SAT and CERA-SAT/Land data. The first Progress Report is submitted (the First Report Publishable Summary can be accessed here).
  • December 2015 - Second General Assembly held at EUMETSAT. GA2 provided the ERA-CLIM2 partners and contributors the forum to assess progress since the 1st General Assembly (19-24 November 2014). During the meeting, open and outstanding scientific and technical issues were discussed, and the work-packages’ plans to advance work were presented.
  • January 2017 - Third General Assembly held at the University of Vienna. The past 12 months have seen the CERA-20C reanalysis been completed: this is the first coupled reanalysis of the 20th century, a very impressive and unique achievement. CERA-20C is now being used to generate the CERA-20C/Land and CERA-20C/Carbon reanalyses. The production of a few years of the CERA-SAT reanalysis has started: the aim is to complete 8-to-10 years, say from 2008 to date. Thanks to the extension, more data are being rescued and post-processed, and are delivered to relevant data bases so that they can be used in future reanalysis (e.g. in the forthcoming C3S ERA5 reanalysis, and in the future C3S ERA6 reanalysis). Furthermore, new assimilation methods developed within the project are being integrated in the software repositories, and some of them will be tested to assess their possible impact on future reanalysis.
  • February 2017 - Second Progress Report submitted (the Second Report Publishable Summary can be accessed here).
  • December 2017 - The Fourth and last General Assembly is held at the University of Bern. The past 12 months have seen the completion of 9 years of the higher-resolution, coupled CERA-SAT reanalysis: this is the first coupled reanalysis of part of the satellite-era, generated using a coupled 3-dimensional ocean, sea-ice, land and atmosphere model, and all available observations. CERA-20C has been used to generate the land and ocean carbon reanalyses of the 20th century. More data have been rescued and post-processed, and have been delivered to relevant data bases so that they can be used in future reanalysis (e.g. in the ECMWF/Copernicus ERA5 reanalysis under production, and in the future ERA6 reanalysis). New assimilation methods have been developed, tested and integrated in the software repositories.
  • 1 February 2018 - All deliverables have been submitted.
  • 9 February 2018 - The Third Periodic Report has been prepared (the Third Publishable Summary can be accessed here).
  • 15 February 2018 - The Final Scientific and Technical Report has been submitted: the Final Publishable Report can be accessed here).
  • 28 February 2018 - The deadline for the submission of the ERA-CLIM2 Final Report and Financial Account.


2. ERA-CLIM2 in numbers:

The production of climate reanalyses required a huge effort and a large amount of human and computer resources. Here are few numbers that summarizes the ERA-CLIM2 project:

  • 4: the number of years spanned by the project (January 2014 to December 2017);
  • 9: the number of years covered by CERA-SAT, the first European ensemble of coupled reanalyses covering some satellite years, more specifically 2008-2016;
  • 10: the number of ensemble members in the CERA-20C and CERA-SAT reanalyses, to provide uncertainty estimations;
  • 12: the number of days that the ERA-CLIM2 participants spent in the 4 ERA-CLIM2 General Assemblies;
  • 16: ERA-CLIM2 involved 16 organizations;
  • 50: about 50 people were funded (either full- or part-time) by ERA-CLIM2;
  • 68: the number of ERA-CLIM2 publications written/submitted/published to date (31/01/2018);
  • 110: the number of years spanned by CERA-20C (from 1901 to 2010), and by the CERA-20C-carbon reanalyses;
  • 1,100: about 1,100 person-months were funded by European Union contribution to the ERA-CLIM2 project;
  • 500,000: the number of coupled assimilation cycles needed to generate CERA-20C;
  • 700,000: about 0.7M station-days of upper-air data have been catalogued and digitized;
  • 1,300,000: about 1.3M snow course observations data have been catalogued and digitized;
  • 2,200,000: about 2.2M station days of surface data have been digitized;
  • 7,000,000: about 7M Euro was the European Union contribution to the ERA-CLIM2 project;
  • 16,000,000: about 16M Euro was the total ERA-CLIM2 budget;
  • 1,600,000,000,000,000: 1,600 Tb is the amount of CERA-20C data.


3. Reanalyses resources (web sites):

Reanalyses have been produced for many years by many organizations, and ERA-CLIM2 can be considered as a major European contribution to the science behind reanalyses production, observation rescuing and re-processing and data production.

Hereafter, links to some of the reanalyses most used web sites are listed:


4. The European Union FP7 projects in reanalysis (web sites):

ERA-CLIM2 was at the heart of a concerted effort in Europe to build the information infrastructure needed to support climate monitoring, climate research and climate services, based on the best available science and observations. ERA-CLIM2 was one of the five designated precursor projects of C3S. It has rescued and post-processed a large volume of observations, and assimilation methods and reanalyses produced thanks to ERA-CLIM2 have started to support the development and implementation of the C3S services. The other four sisters' projects were: