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Model performance metrics and process diagnostics for boreal summer intraseasonal variability

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Abstract

Representation of the boreal summer intraseasonal oscillations (BSISO) is evaluated in the 20-year climate simulations from 27 general circulation models (GCMs), produced as part of a global multi-model evaluation project coordinated to study the vertical structure and physical processes of the Madden–Julian oscillation (MJO). Model performance metrics are developed to assess the simulated BSISO characteristics, with a special focus on its northward propagation over the Asian monsoon domain. Several process-oriented diagnostics developed by the MJO community are also tested for the BSISO. Simulating the phase speed and meridional extent of BSISO northward propagation, the northwest–southeast tilted rain-band structure and the quasi-biweekly mode are identified as some of the persisting problems for many GCMs. Interestingly, many of the GCMs, which capture BSISO eastward propagation, also show good fidelity in simulating BSISO northward propagation. Meridional vertical profiles of anomalous wind, temperature and diabatic heating of BSISO are better simulated in the GCMs that simulate the northward propagation. Process-oriented diagnostics based on seasonal mean vertical shear of zonal and meridional wind, large-scale rain fraction and relative humidity are also examined, but it still remains challenge to find a process diagnostic which is strongly linked to BSISO northward propagation. The complex spatial structure and presence of multi-scale disturbances, demand the development of more focused GCM evaluation metrics and process diagnostics specifically for the BSISO.

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  1. https://www.earthsystemcog.org/projects/gass-yotc-mip/.

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Acknowledgments

The multi-model output analyzed in this study is available for free download from https://earthsystemcog.org/projects/gassyotc-mip/. This study was supported by Indian National Monsoon Mission. Neena Mani and Xianan Jiang acknowledge the support of JIFRESSE-UCLA. X. Jiang acknowledges support by US NSF Climate and Large-Scale Dynamics Program under Award AGS-1228302, and NOAA Climate Program Office under Awards NA12OAR4310075, NA15OAR4310098, and NA15OAR4310177. D. W.’s contribution was carried out on behalf of the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. We thank Drs. Ken Sperber, Harry Hendon and Steve Woolnough for useful suggestions and discussions that helped this study.

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Authors and Affiliations

  1. Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, CA, USA

    J. M. Neena, Duane Waliser & Xianan Jiang

  2. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA

    Duane Waliser

  3. Indian Institute of Science Education and Research, Pune, India

    J. M. Neena

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  1. J. M. Neena
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Correspondence to J. M. Neena.

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Neena, J.M., Waliser, D. & Jiang, X. Model performance metrics and process diagnostics for boreal summer intraseasonal variability. Clim Dyn 48, 1661–1683 (2017). https://doi.org/10.1007/s00382-016-3166-8

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