• Adv. Atmos. Sci.  2018, Vol. 35 Issue (7): 771-784    DOI: 10.1007/s00376-017-7177-0
    Evaluation of Unified Model Microphysics in High-resolution NWP Simulations Using Polarimetric Radar Observations
    Marcus JOHNSON1, 2, Youngsun JUNG1, 2, Daniel DAWSON3, Timothy SUPINIE1, 2, Ming XUE1, 2, Jongsook PARK4, Yong-Hee LEE4
    1Center for Analysis and Prediction of Storms (CAPS), University of Oklahoma, Norman, OK 73072, USA
    2School of Meteorology, University of Oklahoma, Norman, OK 73072, USA
    3Purdue University, West Lafayette, IN 47907, USA
    4Korea Meteorological Administration, Seoul 07062, Korea
    Abstract
    Abstract  

    The UK Met Office Unified Model (UM) is employed by many weather forecasting agencies around the globe. This model is designed to run across spatial and time scales and known to produce skillful predictions for large-scale weather systems. However, the model has only recently begun running operationally at horizontal grid spacings of 1.5 km [e.g., at the UK Met Office and the Korea Meteorological Administration (KMA)]. As its microphysics scheme was originally designed and tuned for large-scale precipitation systems, we investigate the performance of UM microphysics to determine potential inherent biases or weaknesses. Two rainfall cases from the KMA forecasting system are considered in this study: a Changma (quasi-stationary) front, and Typhoon Sanba (2012). The UM output is compared to polarimetric radar observations in terms of simulated polarimetric radar variables. Results show that the UM generally underpredicts median reflectivity in stratiform rain, producing high reflectivity cores and precipitation gaps between them. This is partially due to the diagnostic rain intercept parameter formulation used in the one-moment microphysics scheme. Model drop size is generally both under- and overpredicted compared to observations. UM frozen hydrometeors favor generic ice (crystals and snow) rather than graupel, which is reasonable for Changma and typhoon cases. The model performed best with the typhoon case in terms of simulated precipitation coverage.

    Keywords Unified Model      microphysics      polarimetric radar      radar simulator      numerical weather prediction     
    Just Accepted Date: 08 March 2018   Issue Date: 15 May 2018
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    Articles by authors
    Marcus JOHNSON
    Youngsun JUNG
    Daniel DAWSON
    Timothy SUPINIE
    Ming XUE
    Jongsook PARK
    Yong-Hee LEE
    Cite this article:   
    Marcus JOHNSON,Youngsun JUNG,Daniel DAWSON, et al. Evaluation of Unified Model Microphysics in High-resolution NWP Simulations Using Polarimetric Radar Observations[J]. Adv. Atmos. Sci., 2018, 35(7): 771 -784 .
    URL:  
    http://159.226.119.58/aas/EN/10.1007/s00376-017-7177-0     OR     
    http://159.226.119.58/aas/EN/Y2018/V35/I7/771
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