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气象:2011,37(11):1336-1342
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BCC_AGCM2.0.1模式系统对江淮梅雨期降水的模拟能力
(1.江苏省句容市气象局,句容 212400;2.江苏省气象技术装备中心,南京 210008;3.南京大学大气科学学院,南京 210093;4.江苏省气候中心,南京 210008)
Ability of the Model BCC_AGCM2.0.1 to Reproduce Meiyu Precipitation
(1 Jurong Meteorological Office of Jiangsu, Jurong 212400;2 Jiangsu Meteorological Technology and Equipment Center, Nanjing 210008;3 School of Atmospheric Sciences, Nanjing University, Nanjing 210093;4 Jiangsu Climate Center, Nanjing 210008)
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投稿时间:2010-09-13    修订日期:2011-02-17
中文摘要: 文章通过累积频率方法定义江淮地区观测和模拟的梅雨期,分析国家气候中心大气模式BCC_AGCM2.0.1对我国东部地区暴雨、大雨、中雨和小雨四种等级降水的模拟能力。由于模式的模拟环流背景与实际不同,导致模拟的降水峰值时期与梅雨期有偏差,因此通过累积频率方法定义模拟的梅雨期,模拟梅雨期为6月1候至6月3候,而实际观测梅雨期6月5候至7月2候,模拟期较实际梅雨期提前了20天。模拟结果表明模拟的我国东部总降水量偏少,总雨日数偏多,主要是由于模拟的暴雨日数偏少,小雨日数偏多;观测的江淮地区近40年来暴雨、大雨和中雨呈上升趋势,小雨呈下降趋势,模式模拟的不同等级降水变化趋势与观测相反,暴雨、大雨和中雨呈下降趋势,小雨呈上升趋势。
Abstract:In this study, we assess the ability of the Model AGCM BCC_AGCM2.0.1 to reproduce the precipitation days with different rainfall amount under the atmospheric circulation. By the Cumulative Frequency Distribution (CFD) method, the rainy period in observations is from the fifth pentad of June to the second pentad of July, while the simulated rainy period is from the first pentad to the third pentad of June. Thus the simulation period preceded the observation period by 20 days. Over the Yangtze Huaihe River Basin in general, stormy and heavy rainy days are more, but the moderate and light rainy days are less. Over recent 40 years, as observations indicated, the light rainy days decrease, while the other three rainy days increase. The trend in simulation is opposite to the observation.
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沈 瑱,张耀存,肖 卉,周孝评,2011.BCC_AGCM2.0.1模式系统对江淮梅雨期降水的模拟能力[J].气象,37(11):1336-1342.
Shen Zhen,Zhang Yaocun,Xiao Hui,Zhou Xiaoping,2011.Ability of the Model BCC_AGCM2.0.1 to Reproduce Meiyu Precipitation[J].Meteor Mon,37(11):1336-1342.