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Climate Dynamics

, Volume 45, Issue 1–2, pp 325–335 | Cite as

GCMs with implicit and explicit representation of cloud microphysics for simulation of extreme precipitation frequency

  • In-Sik Kang
  • Young-Min Yang
  • Wei-Kuo Tao
Article

Abstract

The present study aims to develop a general circulation model (GCM) with improved simulation of heavy precipitation frequency by improving the representations of cloud and rain processes. GCMs with conventional convective parameterizations produce common bias in precipitation frequency: they overestimate light precipitation and underestimate heavy precipitation with respect to observed values. This frequency shift toward light precipitation is attributed here to a lack of consideration of cloud microphysical processes related to heavy precipitation. The budget study of cloud microphysical processes using a cloud-resolving model shows that the melting of graupel and accretion of cloud water by graupel and rain water are important processes in the generation of heavy precipitation. However, those processes are not expressed explicitly in conventional GCMs with convective parameterizations. In the present study, the cloud microphysics is modified to allow its implementation into a GCM with a horizontal resolution of 50 km. The newly developed GCM, which includes explicit cloud microphysics, produces more heavy precipitation and less light precipitation than conventional GCMs, thus simulating a precipitation frequency that is closer to the observed. This study demonstrates that the GCM requires a full representation of cloud microphysics to simulate the extreme precipitation frequency realistically. It is also shown that a coarse-resolution GCM with cloud microphysics requires an additional mixing process in the lower troposphere.

Keywords

Frequency of heavy precipitation Cloud resolving model GCM Cold-cloud processes Cloud microphysics 

Notes

Acknowledgments

This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MEST) (NRF-2012M1A2A2671775) and by the Brain Korea 21 Plus. Wei-Kuo Tao was supported by the NASA Precipitation Measurement Missions (PMM), the NASA Modeling, Analysis, and Prediction (MAP) Program.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.School of Earth and Environmental SciencesSeoul National UniversitySeoulSouth Korea
  2. 2.International Pacific Research Center, SOESTUniversity of HawaiiHonoluluUSA
  3. 3.Mesoscale Atmospheric Processes LaboratoryNASA/Goddard Space Flight CenterGreenbeltUSA

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