Advancing Global and Regional Reanalyses Bulletin of the American Meteorological Society

This report outlines the structure of and sum-marizes the recommendations made at the Fifth International Conference on Reanalysis (ICR5),1 attended by 259 participants from 37 countries, in Rome, Italy, on 13–17 November 2017. It first summarizes the conference structure. Then, the key recommendations of ICR5 are given for the five main conference topics: production, observations (data rescue and preparation), data assimilation methods, quality assurance of reanalysis, and applications in science, services, and policy making. Finally, five high-level recommendations are proposed for assisting agencies in how best to advance the field of reanalyses, which serves tens of thousands of users, via enhanced research, development, and operations. 2018 OAR (Oceanic and Atmospheric Research) ESRL (Earth System Research Laboratory) PSL (Physical Sciences Laboratory) CIRES (Cooperative Institute for Research in Environmental Sciences) Submitted https://doi.org/10.1175/BAMS-D-17-0312.1 CC BY 1952