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# IGCM4: a fast, parallel and flexible intermediate climate model

## Author(s): Joshi, Manoj; Stringer, Marc; van der Wiel, Karin; O'Callaghan, Amee; Fueglistaler, Stephan

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 Abstract: The IGCM4 (Intermediate Global Circulation Model version 4) is a global spectral primitive equation climate model whose predecessors have extensively been used in areas such as climate research, process modelling and atmospheric dynamics. The IGCM4’s niche and utility lies in its speed and flexibility allied with the complexity of a primitive equation climate model. Moist processes such as clouds, evaporation, atmospheric radiation and soil moisture are simulated in the model, though in a simplified manner compared to state-of-the-art global circulation models (GCMs). IGCM4 is a parallelised model, enabling both very long integrations to be conducted and the effects of higher resolutions to be explored. It has also undergone changes such as alterations to the cloud and surface processes and the addition of gravity wave drag. These changes have resulted in a significant improvement to the IGCM’s representation of the mean climate as well as its representation of stratospheric processes such as sudden stratospheric warmings. The IGCM4’s physical changes and climatology are described in this paper. Publication Date: 23-Apr-2015 Citation: Joshi, Manoj, Marc Stringer, Karin Van Der Wiel, Amee O'Callaghan, and Stephan Fueglistaler. "IGCM4: a fast, parallel and flexible intermediate climate model." Geoscientific Model Development 8, no. 4 (2015): 1157-1167. doi:10.5194/gmd-8-1157-2015. DOI: doi:10.5194/gmd-8-1157-2015 ISSN: 1991-959X EISSN: 1991-9603 Pages: 1157 - 1167 Type of Material: Journal Article Journal/Proceeding Title: Geoscientific Model Development Version: Final published version. This is an open access article.

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