This report documents a comparison between two long integrations of HadCM3 which have been performed for COAPEC: one on a Cray T3E using Unified Model version 4.4, the other on a Beowulf cluster using UM version 4.5. A detailed comparison of difference plots between the two models shows a number of statistically significant differences in some fields, but these are small in magnitude, and both models are judged to be equally valid for scientific use for climate studies. Data are available from both runs at the NCAS/British Atmospheric Data Centre, and can be supplied to the research community.

Previously curated at: http://cedadocs.ceda.ac.uk/92/ The publish date on this item was its original completed date. This item was previously associated with content (as an official url) at: http://badc.nerc.ac.uk/data/coapec/comparison.pdf. Associated projects: Coupled Ocean-Atmosphere Processes and European Climate (COAPEC) Main files in this record: comparison.pdf Item originally deposited with Centre for Environmental Data Analysis (CEDA) document repository by Ms Belinda Robinson. Transferred to CEDA document repository community on Zenodo on 2022-11-24