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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers | Copyright
https://doi.org/10.5194/gmd-2018-190
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Methods for assessment of models 16 Oct 2018

Methods for assessment of models | 16 Oct 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

Convective response to large-scale forcing in the Tropical Western Pacific simulated by spCAM5 and CanAM4.3

Toni Mitovski1, Jason N. S. Cole1, Norman A. McFarlane2, Knut von Salzen2, and Guang J. Zhang3 Toni Mitovski et al.
  • 1Canadian Centre for Climate Modelling and Analysis, Environment Canada, Toronto, ON, Canada
  • 2Canadian Centre for Climate Modelling and Analysis, Environment Canada, Victoria, BC, Canada
  • 3Scripps Institution of Oceanography, University of California, San Diego, CA, USA

Abstract. Changes in the large-scale environment during convective precipitation events in the Tropical Western Pacific simulated by version 4.3 of the Canadian Atmospheric Model (CanAM4.3) is compared against those simulated by version 5.0 of the super parameterized Community Atmosphere Model (spCAM5). This is done by compositing sub-hourly output of convective rainfall, convective available potential energy (CAPE), CAPE generation due to large-scale forcing in the free troposphere (dCAPELSFT), and near surface vertical velocity (ω) over the time period May–July 1997. Compared to spCAM5, CanAM4.3 tends to produce more frequent light convective precipitation (<0.2mmh−1) and underestimates the frequency of extreme convective precipitation (>2mmh−1). In spCAM5 5% of convective precipitation events lasted less than 1.5h and 75% lasted between 1.5 and 3.0h while in CanAM4.3 80% of the events lasted less than 1.5h. Convective precipitation in spCAM5 is found to be a function of dCAPELSFT and the large-scale near surface ω with variations in ω slightly leading variations in convective precipitation. Convective precipitation in CanAM4.3 does not have the same dependency and instead is found to be a function of CAPE.

Toni Mitovski et al.
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Short summary
Changes in the large-scale environment during convective precipitation events simulated by the Canadian Atmospheric Model (CanAM4.3) are compared against those simulated by the super parameterized Community Atmosphere Model (spCAM5). Compared to spCAM5, CanAM4.3 underestimates the frequency of extreme convective precipitation and the duration of convective events are 50 % shorter. The dependence of precipitation on changes in the large-scale environment differs between CanAM4.3 and spCAM5.
Changes in the large-scale environment during convective precipitation events simulated by the...
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