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2010•Advances in MeteorologyOpen access

Evaluation of the WRF Double‐Moment 6‐Class Microphysics Scheme for Precipitating Convection

Song‐You Hong, Kyo‐Sun Sunny Lim, Yong Hee Lee, Jong-Chul Ha, Hyung-Woo Kim, Sook-Jeong Ham, Jimy Dudhia

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Abstract

This study demonstrates the characteristics of the Weather Research and Forecasting (WRF) Double‐Moment 6‐Class (WDM6) Microphysics scheme for representing precipitating moist convection in 3D platforms, relative to the WSM6 scheme that has been widely used in the WRF community. For a case study of convective system over the Great Plains, the WDM6 scheme improves the evolutionary features such as the bow‐type echo in the leading edge of the squall line. We also found that the WRF with WDM6 scheme removes spurious oceanic rainfall that is a systematic defect resulting from the use of the WSM6 scheme alone. The simulated summer monsoon rainfall in East Asia is improved by weakening (strengthening) light (heavy) precipitation activity. These changes can be explained by the fact that the WDM6 scheme has a wider range in cloud and rain number concentrations than does the WSM6 scheme.

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What this paper is about

This study demonstrates the characteristics of the Weather Research and Forecasting (WRF) Double‐Moment 6‐Class (WDM6) Microphysics scheme for representing precipitating moist convection in 3D platforms, relative to the WSM6 scheme that has been widely used in the WRF community. For a case study of convective system over the Great Plains, the WDM6 scheme improves the evolutionary features such as the bow‐type echo in the leading edge of the squall line. We also found that the WRF with WDM6 scheme removes spurious oceanic rainfall that is a systematic defect resulting from the use of the WSM6 scheme alone. The simulated summer monsoon rainfall in East Asia is improved by weakening (strengthening) light (heavy) precipitation activity. These changes can be explained by the fact that the WDM6 scheme has a wider range in cloud and rain number concentrations than does the WSM6 scheme.

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Available abstract

This study demonstrates the characteristics of the Weather Research and Forecasting (WRF) Double‐Moment 6‐Class (WDM6) Microphysics scheme for representing precipitating moist convection in 3D platforms, relative to the WSM6 scheme that has been widely used in the WRF community. For a case study of convective system over the Great Plains, the WDM6 scheme improves the evolutionary features such as the bow‐type echo in the leading edge of the squall line. We also found that the WRF with WDM6 scheme removes spurious oceanic rainfall that is a systematic defect resulting from the use of the WSM6 scheme alone. The simulated summer monsoon rainfall in East Asia is improved by weakening (strengthening) light (heavy) precipitation activity. These changes can be explained by the fact that the WDM6 scheme has a wider range in cloud and rain number concentrations than does the WSM6 scheme.

Key concepts: Weather Research and Forecasting Model, Climatology, Squall line, Convection, Precipitation, Meteorology, Monsoon, Mesoscale convective system

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