全球50 km分辨率SNU-AGCM模式模擬熱帶氣旋活動

doi:10.3969/2014jms.0050

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全球50 km分辨率SNU-AGCM模式模擬熱帶氣旋活動
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                        10.3969/2014jms.0050
                    
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基金項目:國家自然科學基金資助項目(41275093)

Simulation of global tropical cyclone activity by 50 km resolution SNU-AGCM

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為了驗證50 km分辨率的SNU-AGCM模式(Seoul National University Atmospheric General Circulation Model)模擬TC活動的能力, 利用Hadley中心月平均海溫資料驅動模式, 模擬了1980—2009年全球熱帶氣旋的活動特征。與觀測資料對比分析, 兩組利用不同對流參數(shù)化方案的試驗, 都能夠模擬與觀測類似的TC結構以及全球TC活動的主要特點, 包括全球生成總頻數(shù)、各海區(qū)路徑分布和TC活動的季節(jié)變化。但是各個海域TC生成的年平均頻數(shù)與觀測還存在明顯差異。模式中西北太平洋和南太平洋兩組試驗平均的TC頻數(shù)較觀測分別偏多21.5%和31.3%;而北大西洋、南北印度洋分別偏少11.4%、41.1%和50%。模擬的東北太平洋TC比觀測少了將近88%, 而觀測中TC極少的南大西洋在兩組試驗中平均每年卻有1.5個TC生成。模擬的TC頻數(shù)較觀測的差異主要與模擬的北印度洋季風、西北太平洋季風槽、垂直風切變、850 hPa相對渦度與觀測的差異有關。

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To assess the ability of Seoul National Atmospheric General Circulation Model(SNU-AGCM) AGCM in simulating the characteristics of tropical cyclones(TC₁), the driven model of the observed monthly mean sea surface temperature data from Hadley Centre during 1980-2009 is used to simulate the characteristics of global TCs. Comparison with observations shows that the model with two different convective parametric schemes is capable in reproducing the basic features of the observed tropical cyclone such as TC structure, number of total cyclones, track locations and seasonality. However, differences exist in different oceans. The mean yearly TC frequency in two different experiments is 21.5% and 31.3% more than that in the observations in the Northwest Pacific and the southern Pacific, while 11.4%, 41.1% and 50% less in the northern Atlantic, the southern and the northern Indian Ocean, respectively. Furthermore, the genesis of TC in the eastern Pacific in model is 88% less than in the observation while nearly 1.5 unexpected cyclones per year happen in the southern Atlantic. Further research shows that the differences of TC frequency between simulation and observation are mainly associated with the differences of Indian monsoon, the Northwest Pacific monsoon trough, vertical wind shear and 850 hPa relative vorticity.

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曹翔,吳立廣,曹劍.全球50 km分辨率SNU-AGCM模式模擬熱帶氣旋活動.氣象科學,2015,35(3):258-267 CAO Xiang, WU Liguang, CAO Jian. Simulation of global tropical cyclone activity by 50 km resolution SNU-AGCM. Journal of the Meteorological Sciences,2015,35(3):258-267

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收稿日期:2013-11-10
最后修改日期:2014-05-04
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在線發(fā)布日期: 2015-07-03
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