The building maintenance scheduled for Friday February 27th at 5:00pm MST has been postponed until 5:00pm March 6th. PSD's website will be down during the maintenance.

Announcement of the release of the collaborative website

November 10, 2010

A reanalyses comparison table on the website

ESRL is hosting a new, wiki-based collaborative website, designed for international reanalysis creators and users. Reanalysis is a scientific method for developing a comprehensive record of how weather and climate are changing over time. Observations and a numerical model that simulates aspects of the Earth system are combined to objectively generate a synthesized estimate of the state of the system. Reanalysis products are used extensively in climate research and services for monitoring and comparing current climate conditions with those of the past, identifying the causes of climate variations and change, and preparing climate predictions. Information derived from reanalyses is also being used increasingly in commercial and business applications in sectors such as energy, agriculture, water resources and insurance.

The goal of is to facilitate comparison between reanalysis and observational datasets. The website content will be provided by reanalysis developers and users. Detailed data descriptions, data access methods, analysis and plotting tools, and dataset references will be made available. As a wiki, it will be easy to keep up-to-date. Knowledgeable contributors can easily write about a topic. Comparisons and diagnoses of reanalysis datasets will be facilitated by the ease of adding to a wiki. Wiki contributors will have the option of keeping some discussions within the contributing group as drafts until they are ready to be made public, encouraging scientific discourse. brings together climate researchers from across the globe (NOAA, NASA, ECMWF, JMA, UK Met Office, NCAR and universities), facilitating the quick exchange of ideas.

( is a collaboration of the Atmospheric Circulation Reconstructions over the Earth initiative, the Global Climate Observing System (GCOS) Working Group on Surface Pressure, and the GCOS/World Climate Research Programme Working Group on Observational Data Sets for Reanalysis, and their partners.)

Contact: Gil Compo More Information: