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MRI-CGCM模式对东亚夏季风的模拟评估及订正

罗连升 段春锋 杨玮 徐敏 程智 丁小俊

罗连升, 段春锋, 杨玮, 徐敏, 程智, 丁小俊. MRI-CGCM模式对东亚夏季风的模拟评估及订正[J]. 大气科学, 2016, 40(6): 1320-1332. doi: 10.3878/j.issn.1006-9895.1602.15188
引用本文: 罗连升, 段春锋, 杨玮, 徐敏, 程智, 丁小俊. MRI-CGCM模式对东亚夏季风的模拟评估及订正[J]. 大气科学, 2016, 40(6): 1320-1332. doi: 10.3878/j.issn.1006-9895.1602.15188
LUO Liansheng, DUAN Chunfeng, YANG Wei, XU Min, CHENG Zhi, DING Xiaojun. Evaluation and Correction of the East Asian Summer Monsoon Simulated by MRI Coupled Ocean–Atmosphere General Circulation Model[J]. Chinese Journal of Atmospheric Sciences, 2016, 40(6): 1320-1332. doi: 10.3878/j.issn.1006-9895.1602.15188
Citation: LUO Liansheng, DUAN Chunfeng, YANG Wei, XU Min, CHENG Zhi, DING Xiaojun. Evaluation and Correction of the East Asian Summer Monsoon Simulated by MRI Coupled Ocean–Atmosphere General Circulation Model[J]. Chinese Journal of Atmospheric Sciences, 2016, 40(6): 1320-1332. doi: 10.3878/j.issn.1006-9895.1602.15188

MRI-CGCM模式对东亚夏季风的模拟评估及订正

doi: 10.3878/j.issn.1006-9895.1602.15188
基金项目: 公益性行业(气象)科研专项201406021,安徽省自然科学基金项目1308085QD69、1408085MD73

Evaluation and Correction of the East Asian Summer Monsoon Simulated by MRI Coupled Ocean–Atmosphere General Circulation Model

  • 摘要: 本文利用CMAP月降水资料、NCEP再分析资料、NOAA的ERSST资料和日本气象厅海气耦合模式(MRI-CGCM)的输出结果,从东亚夏季风气候态、主模态和年际变率等方面分析了MRI-CGCM模式对东亚夏季风的预测性能,并且利用观测的东亚夏季风指数(EASMI)与模拟PC(principal component)的关系建立多元线性回归方程来订正EASMI(简称PC订正法)。结果表明:MRI-CGCM模式能够较好再现东亚夏季风降水和低层风场的气候态,但模拟的西北太平洋反气旋偏弱、偏东,使得模拟的副热带地区降水量偏小。模式较好地模拟出东亚夏季风降水第一模态(EOF1)及相应的低层风场,能够较好再现出EOF1对应El Niño衰减位相;模拟降水的EOF1与观测之间的空间相关系数(ACC)为0.72,且能较好地再现其对应的年际变率,其时间系数PC1与观测之间的相关系数为0.41,能模拟出观测EOF1的2 a和5 a主导周期;但模拟的我国以东梅雨锋区雨带位置偏南,这与模拟的西北太平洋反气旋位置偏南有关。模式对降水第二模态EOF2的模拟能力比EOF1明显下降,模拟EOF2与观测之间的ACC降到0.36;虽然模式能较好地再现出EOF2对应El Niño发展位相,但模拟的西太平洋反气旋位置偏南,使得雨带位置偏南,模拟的我国梅雨锋区雨带位于江南,与观测场上江南少雨相反。模式较好地模拟出我国东部夏季降水和气温空间异常分布和年际变化,模拟与观测夏季降水和气温的多年平均ACC分别为0.74和0.68。模式模拟我国东部、江淮流域和华南地区夏季降水多年平均PS评分分别为69、70和68分,略高于我国夏季降水业务预测多年平均评分(65分)。模拟的我国东部夏季气温与观测多年平均PS评分为74分。PC订正后EASMI与实况的相关系数由0.51提高到0.65、符号一致率由84%升到91%、标准差由0.75增大到1.4、大于1个标准差年数由6年变为12年,订正后在模拟变幅偏小和梅雨锋区雨带偏南等方面均有一定的改善,对应西太平洋反气旋位置和梅雨锋区雨带位置与实况较为吻合。
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