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2015 , Vol. 34 >Issue 4: 890 - 909

DOI: https://doi.org/10.7522/j.issn.1000-0534.2014.00113

Evaluation and Comparison of Two Double-Moment Bulk Microphysics Schemes Using WRF Single-Column Model

  • MEI Haixia ,
  • SHEN Xinyong ,
  • WANG Weiguo ,
  • HUANG Wei
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  • Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology, Nanjing 210044, China;2. Jiangsu Institute of Meteorological Sciences, Nanjing 210009, China;3. Key Laboratory of Cloud-Precipitation Physics and Severe Storms, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;4. National Centers for Environmental Prediction, National Oceanic and Atmospheric Administration, Maryland 20746, USA

Received date: 2014-03-05

  Online published: 2015-08-28

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Abstract

Two double-moment Bulk Microphysics Schemes, Milbrandt 2-mon(MY) and Morrison 2-mon(MORR), were compared using the WRF single-column model during the period of the Tropical Warm Pool International Cloud Experiment. Results from the control simulations with the default settings of the two microphysics schemes in the Weather Research and Forecasting(WRF) model were able to reasonably reproduce the characteristics of the rain rate, the liquid water content, and the frozen water content, as compared with observations and cloud resolving model(CRM) results. The surface downward longwave radiation and outgoing longwave radiation were very close to observations as well. There is little difference in the macro-and micro-physical properties of the raindrops but a large divergence in the mixing ratio of cloud droplets between two schemes throughout the whole period. In the MY scheme, Ice crystals are dominant in ice clouds while snow particles make more contributions to the ice clouds in the MOR scheme. On a micro level, in the MOR scheme, water clouds contain more smaller cloud droplets while ice clouds are made up of less bigger ice crystals than those in the MY scheme. The distribution differences in ice clouds between two schemes are closely related with conversion rates of microphysical. Analyses of the conversion terms of microphysical processes suggest that ice crystals in both schemes are mainly related to processes of deposition growth, autoconversion of ice crystals to snow, collection by snow and sedimentation during the active monsoon period. The dominating conversion terms of snow in MY scheme are more various than those in the MOR scheme with deposition growth and sedimentation processes included in two schemes. The differences in vertical distribution and magnitude of the main conversion terms are pretty consistent with the composition features of ice clouds simulated by two schemes during the active monsoon period. In the depressed monsoon period, ice crystals in both schemes are dominated by deposition growth and sedimentation processes with ice nucleation in deposition mode and condensation freezing mode playing an equally important role only in the MY scheme. Snow clouds in the MOR scheme develop stronger with more kinds of primary conversion terms about one order of magnitude higher than the MY ones during the depressed monsoon period.

Key words： Single-Column Model; Double-moment; Ice crystals; Snow; Microphysics

Cite this article

MEI Haixia , SHEN Xinyong , WANG Weiguo , HUANG Wei . Evaluation and Comparison of Two Double-Moment Bulk Microphysics Schemes Using WRF Single-Column Model[J]. Plateau Meteorology, 2015 , 34(4) : 890 -909 . DOI: 10.7522/j.issn.1000-0534.2014.00113

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