SPARC Reanalysis Intercomparison Project

S-RIP Report Overview

The SPARC Reanalysis Intercomparison Project (S-RIP) is a coordinated activity to compare all (or some of the newer) reanalysis data sets for various key diagnostics, understand the causes of differences among reanalyses, provide guidance on the appropriate usage of various reanalysis products in scientific studies, and connect such activities with future improvements in the reanalysis products by establishing collaborative links between the reanalysis centres and the SPARC community.

S-RIP focuses on reanalysis output in the stratosphere, upper troposphere and lower mesosphere. This activity is closely connected with the SPARC Data Assimilation activity (see also SPARC's current activities). We welcome your contributions to this project. Please contact the S-RIP preparation team and/or the co-leads of the relevant chapters directly.

The S-RIP report will be structured with four "basic" chapters summarizing the underlying structure, climatology, and interannual variability of the reanalysis systems (Chapters 1–4 as listed in the report structure). This initial summary will be followed by seven "advanced" chapters detailing the performance of each reanalysis with respect to key aspects of the stratospheric structure and circulation (e.g., the Brewer–Dobson circulation, the quasi-biennial oscillation, stratosphere–troposphere coupling), with particular focus on commonly used metrics (Chapters 5–11). The report will conclude with a synthesis summary (Chapter 12).

We encourage the contributors to use the S-RIP colour definition for each reanalysis data set to enhance the readability of the whole report. Contact Masatomo Fujiwara for more information.

The idea for the S-RIP was first discussed in June 2011 at the 8th SPARC Data Assimilation workshop in Brussels, Belgium, and was officially endorsed as an emerging activity by the SPARC Scientific Steering Group in February 2012. The S-RIP working group was formed with 11 members in July 2012. This working group discussed prospective chapter titles, co-leads, and contributors to the report. A kickoff planning meeting was held with 39 participants at the Met Office in Exeter, UK from 29 April to 1 May 2013. The S-RIP was endorsed as a full SPARC activity in January 2014. The 2014 workshop was held at NOAA in Maryland, USA from 10 to 12 September 2014. The 2015 workshop was held at Université Pierre-et-Marie-Curie in Paris, France from 12 to 14 October 2015. The 2016 workshop was held in Victoria, Canada from 19 to 21 October 2016.