Last edited by gilbert.p.compo on Mon, 11/02/2015 - 11:02



  • January 10-14, 2016: AMS Annual Meeting - Sessions on Reanalysis , New Orleans, Louisiana.

20th Century Reanalysis: Methods and Applications
To better understand and model the observed variability of the earth system, one can rapidly expand the available record by objectively combining disparate observations with numerical model-generated guesses. The "reanalyses" or "syntheses" of atmospheric, oceanic, land, and cryospheric observations generated by such a data assimilation process provide comprehensive physically consistent descriptions of evolving system states. Such widely used datasets have become essential to the study of the earth system on timescales from hours to a century. However, they are not without room for improvement. This session welcomes all contributions on applications of reanalysis data, on comparisons of reanalyses and observations, on advancing reanalysis methodology, and on issues in using reanalysis for weather and climate problems.

Earth System Climate Reanalyses: Low Frequency Variability and Trends
The last three decades have been marked by major shifts in a number of climate modes of variability including the Atlantic Multi-decadal Oscillation and the Pacific Decadal Oscillation – shifts that have been linked to changes in drought and weather extremes throughout the world, as well as the recent hiatus in long-term surface temperature trends. Reanalyses offer a dynamically and physically consistent global interdisciplinary framework for assessing and understanding the nature of such regional changes. This session seeks contributions that take advantage of reanalyses of observations to address various aspects of climate variability and change as outlined above. This includes comparisons between the multi-disciplinary set of reanalyses of the Earth System(e.g. land, ocean, aerosol and cryosphere) and observations, downscaling of reanalyses including an assessment of changes in weather extremes, modeling (e.g., AGCM) studies that put the reanalysis results in the context of underlying climate uncertainty, as well as studies that seek to assess, understand and/or correct inhomogeneities that limit the usefulness of reanalyses for assessing low frequency variability and trends including efforts to improve the ability to produce consistent reanalyses of the coupled climate system. and choose one of the above topics

Deadline for abstract: has passed


  • December 14-18, 2015: AGU Fall Meeting - Session on Reanalysis Evaluation and Intercomparison, San Francisco, California.

Evaluating Reanalysis: What Can We Learn about Past Weather and Climate? (Monday, 14 Dec.) (Monday, AM 1: Oral) (Monday, AM 2: Oral) (Monday, PM: Poster) 

The session welcomes contributions on the evaluation and intercomparison of reanalyses, including global, regional, atmospheric, ocean, and coupled reanalyses. In particular, intercomparison of multiple reanalyses and comparisons with independent (non-assimilated) data are encouraged.

Deadline for abstract: has passed


The workshop will focus upon the progress of S-RIP Report Chapters on the current and past reanalyses to SPARC.

This workshop will overlap with the SPARC Data Assimilation worksop which begins on September 8-10, 2014.

Both workshops will be held at the NOAA Center for Climate and Weather Prediction in College Park, Maryland, USA.

Information about the workshops, registration, directions, etc can be found on the meeting website.


  • April 29-May 1, 2013: SPARC Reanalysis/analysis Intercomparison Project (S-RIP) Planning Meeting in Exeter, UK.

    The scientific objectives, scope and aims of the meeting appear on the meeting website  

    Important Additional Information:  
      The meeting is open to all, but since space is limited all participants must register. To do this, please  send the following information to Name, 2: Email address, 3: Affiliation, 4: Title and short abstract (if you are submitting a poster))  .

    Information on travelling to the Met Office is found   at the meeting webpage.

  • June 17-21, 2013: American Meteorological Society Conference on the Middle Atmosphere, Newport, Rhode Island, USA. Members of the SPARC Data Assimilation Working Group are encouraged to submit abstracts (there shall be no separate SPARC Data Assimilation Workshop in 2013). Special sessions on Data Assimilation will be convened at the conference, provided enough relevant abstracts are submitted. A side meeting will be organised to discuss SPARC Data Assimilation Working Group-related business.


  • October 7-11 2013: Sixth WMO Symposium on Data Assimilation, College Park, Maryland, USA
    Symposium Goals:
    (1) Assess recent progress in atmospheric, oceanographic, and hydrologic data assimilation, in both research and operational environments.
    (2) Reach common understanding of the main challenges and opportunities that lie ahead in data assimilation.
  • December 9-13 2013: AGU Fall Meeting - Session on Atmospheric Reanalysis, San Francisco, California, USA
    The session is open to contributions on current reanalysis developments including data assimilation, ensemble methods, coupled reanalysis, regional reanalysis, and the evaulation of reanalysis products. We especially encourage contributions on the verification of reanalyses using independent observations.

    We will have invited contributions from the following authors:
    - Michael Bosilovich (NASA) - Earth System reanalysis
    - Gil Compo (NOAA) - Sparse Input Reanalysis




Legler, D., Dole R., 2011: Identifying Challenges and Opportunities for Earth System Reanalyses. EOS Transactions, 92, 172.

Legler D., Dole R., Allan R., Compo G., Carton J., 2011:  Evaluation of Reanalyses – Developing an Integrated Earth System Analysis (IESA) Capability Workshop and the 3rd Atmospheric Circulation Reconstructions over the Earth (ACRE) Workshop: Reanalysis and Applications. US Clivar Variations, 9, 5-6, May 2011.

Allan R., Compo G., Carton J., 2011: Recovery of Global Surface Weather Observations for Historical Reanalyses and International Users, EOS Transactions, 92, 154.

Legler D., Dole R., Allan R., Compo G., Carton J., 2011:  Evaluation of Reanalyses – Developing an Integrated Earth System Analysis (IESA) Capability Workshop and the 3rd Atmospheric Circulation Reconstructions over the Earth (ACRE) Workshop: Reanalysis and Applications. US Clivar Variations, 9, 5-6, May 2011. 


Meeting and other Presentations

Webinar:  Reanalysis Research: Laying the Groundwork for the Next Generation of NOAA Reanalyses. 24 June 2014, 2-3pm Eastern Daylight Time. Download mp4 recording.

By Topics (in progress)

Reanalysis Overviews:

Observational Data

  Data Recovery

Extremes and Variability

Specific Events

Outreach and Education


Comments (1)

Re: Meetings

A report manuscript for the S-RIP Planning Meeting (April 29-May 1, 2013) is now available at

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