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Intercomparison of bulk microphysics schemes in model simulations of polar lows Prudence Chien 2010.12.14 Wu, L., and G. W. Petty, 2010: Intercomparison.

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Presentation on theme: "Intercomparison of bulk microphysics schemes in model simulations of polar lows Prudence Chien 2010.12.14 Wu, L., and G. W. Petty, 2010: Intercomparison."— Presentation transcript:

1 Intercomparison of bulk microphysics schemes in model simulations of polar lows
Prudence Chien Wu, L., and G. W. Petty, 2010: Intercomparison of bulk microphysics schemes in model simulations of polar lows. Mon. Wea. Rev., 138, 2211–2228. Progress report

2 OUTLINE Introduction Model configuration Observation data
Model results Summary

3 Introduction Morrison et al. 2005曾使用WSM5、Older Thompson和Morrison schemes對於北冰洋 進行模擬,其敏感度不顯著 尚未有人針對極區低壓使用其他雲微物理方案之模擬研究 本研究選定四個個案進行研究 兩個案發生在日本海(JP1, JP2) 兩個案發生在北歐海域(ND1, ND2)

4 Model configuration Use WRFV3 2 nested domain, 25km -> 5km
28 sigma level Two-way nesting NCEP FNL (1∘x 1∘) 5 Bulk microphysics schemes are used: Lin, WSM6, GCE, Thompson 2008, and Morrison include 5 hydrometeors: vapor, cloud water, cloud ice, rain, snow, and graupel

5 Observation data AMSR-E : Advanced Microwave Scanning Radiometer for Earth Observing System Aqua 衛星承載之微波輻射儀,用來反演空氣柱之水氣量、雲水、地表降水率、 地面風速、海冰範圍、海表溫度等。 AMSR-E觀測到四個極區低壓的時間及位置:

6 1) Precipitation rate: UWPA (University of Wiscosin Precipitation Algorithm) 可反演 AMSE-R在海上的降雨率
2) AMSR-E 反演風 3) AMeDAS─雷達估計降水資料 (只有JP1個案有資料) 4) MODIS 雲頂溫度(CTT)資料

7 綜觀天氣圖─ SLP hPa 厚度 992 988 980

8 AMSR-E 風速 模式模擬風速 (WSM6) AMeDAS 降雨率 UWPA 降雨率

9 Model results

10 模式模擬綜觀氣象場─SLP、1000hPa-500hPa之厚度
路徑圖─ 利用SLP定位極地低壓中心位置

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13 CTT Lin OBS GCE WSM6 New-THMN MORI

14 Precipitation rate MORI Lin WSM6 New-THMN GCE Same pattern

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16 降雨分布之空間相關性分析

17 網域平均降雨─模擬雨量與觀測雨量之比例分析

18 SUMMARY 本研究比較5種雲微物理方案對於極區低壓系統之模擬結果,主要可由以下四 個物理量來評估:雲頂溫度、最大降雨率、降雨空間分布、水相粒子


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