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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Model experiment description paper
26 Oct 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).
Overview of experiment design and comparison of models participating in phase 1 of the SPARC Quasi-Biennial Oscillation initiative (QBOi)
Neal Butchart1, James A. Anstey2, Kevin Hamilton3, Scott Osprey4, Charles McLandress5,2, Andrew C. Bushell6, Yoshio Kawatani7, Young-Ha Kim8, Francois Lott9, John Scinocca2, Tim Stockdale10, Omar Bellprat11, Peter Braesicke12, Chiara Cagnazzo13, Chih-Chieh Chen14, Hye-Yeong Chun15, Mikhail Dobrynin16, Rolando R. Garcia14, Javier Garcia-Serrano11, Lesley J. Gray4, Laura Holt17, Tobias Kerzenmacher12, Hiroaki Naoe18, Holger Pohlmann19, Jadwiga H. Richter14, Adam A. Scaife1,20, Verena Schenzinger4, Federico Serva13,21, Stefan Versick12, Shingo Watanabe7, Kohei Yoshida18, and Seiji Yukimoto18 1Met Office Hadley Centre (MOHC), Exeter, UK
2Canadian Centre for Climate Modelling and Analysis (CCCma), Victoria, Canada
3International Pacific Research Center (IPRC), Honolulu, USA
4National Centre for Atmospheric Science (NCAS), University of Oxford, Oxford, UK
5University of Toronto, Toronto, Canada
6Met Office, Exeter, UK
7Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama, Japan
8Ewha Womans University, Seoul, South Korea
9Laboratoire de Météorologie Dynamique (LMD), Paris, France
10European Centre for Medium-Range Weather Forecasts (ECMWF), Reading, UK
11Barcelona Supercomputing Center (BSC), Barcelona, Spain
12Karlsruher Institut für Technologie (KIT), Karlsruhe, Germany
13Istituto di Scienze Dell’Atmosfera e del Clima (ISAC), Roma, Italy
14National Center for Atmospheric Research (NCAR), Boulder, USA
15Yonsei University, Seoul, South Korea
16Universität Hamburg, Hamburg, Germany
17NorthWest Research Associates (NWRA), Boulder, USA
18Meteorological Research Institute (MRI), Tsukuba, Japan
19Max-Planck-Institut für Meteorologie (MPI), Hamburg, Germany
20University of Exeter, Exeter, UK
21Università degli Studi di Napoli “Parthenope", Napoli, Italy
Abstract. The Stratosphere-troposphere Processes And their Role in Climate (SPARC) Quasi-Biennial Oscillation initiative (QBOi) aims to improve the fidelity of tropical stratospheric variability in general circulation and Earth system models by conducting coordinated numerical experiments and analysis. In the equatorial stratosphere, the QBO is the most conspicuous mode of variability. Five coordinated experiments have therefore been designed to (i) evaluate and compare the verisimilitudeof modelled QBOs under present-day conditions, (ii) identify robustness (or, alternatively the spread/uncertainty) in the simulated QBO response to commonly imposed changes in model climate forcings (e.g., a doubling of CO2 amounts) and, (iii) examine model dependence of QBO predictability. This paper documents these experiments and the recommended output diagnostics. The rationale behind the experimental design and choice of diagnostics is presented. To facilitate scientific interpretation of the results in other planned QBOi studies, consistent descriptions of the models performing each experiment set are given, with those aspects particularly relevant for simulating the QBO tabulated for easy comparison.

Citation: Butchart, N., Anstey, J. A., Hamilton, K., Osprey, S., McLandress, C., Bushell, A. C., Kawatani, Y., Kim, Y.-H., Lott, F., Scinocca, J., Stockdale, T., Bellprat, O., Braesicke, P., Cagnazzo, C., Chen, C.-C., Chun, H.-Y., Dobrynin, M., Garcia, R. R., Garcia-Serrano, J., Gray, L. J., Holt, L., Kerzenmacher, T., Naoe, H., Pohlmann, H., Richter, J. H., Scaife, A. A., Schenzinger, V., Serva, F., Versick, S., Watanabe, S., Yoshida, K., and Yukimoto, S.: Overview of experiment design and comparison of models participating in phase 1 of the SPARC Quasi-Biennial Oscillation initiative (QBOi), Geosci. Model Dev. Discuss.,, in review, 2017.
Neal Butchart et al.
Neal Butchart et al.
Neal Butchart et al.


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Short summary
This paper documents the numerical experiments to be used in phase1 of the Stratosphere-Troposphere Processes and their role in Climate (SPARC) Quasi-Biennial Oscillation initiative (QBOi) set up to improve the representation of the QBO and tropical stratospheric variability in global climate models.
This paper documents the numerical experiments to be used in phase1 of the...