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气象:2016,42(1):97-106
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边界强迫场订正的区域气候模式对2013年夏季中国东部极端高温预测的改进试验
(1.南京信息工程大学大气科学学院,南京 210044;2.上海市气候中心,上海 200030;3.中国气象局上海台风研究所,上海 200030)
The Improvement of Predicting Extreme Heat Event of Eastern China in Summer 2013 Through Correcting Lateral Boundary Condition of Regional Climate Model
(1.College of Atmospheric Science, Nanjing University of Information Science and Technology, Nanjing 210044;2.Shanghai Climate Centre, Shanghai 200030;3.Shanghai Typhoon Institute, CMA, Shanghai 200030)
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投稿时间:2015-01-21    修订日期:2015-11-05
中文摘要: 使用NCEP再分析资料对国家气候中心全球海气耦合模式BCC_CM1.0的多年平均场进行订正,然后嵌套区域气候模式RegCM3,建立基于边界强迫场订正的区域气候模式系统。使用该系统进行28年夏季回报及2013年夏季业务预测,并与直接使用BCC_CM1.0模式与RegCM3模式嵌套的模式系统进行对比。结果表明,引入边界强迫场订正技术后,区域气候模式系统对多年平均夏季气温、降水回报能力有了显著提高,且回报的高温界限值分布更接近于观测。除对2013年夏季东北地区气温距平预测效果变差外模式系统对于2013年中国东部中部地区夏季气温距平异常偏高、夏季高温日数异常偏多等观测事实的预测性能有显著提高。区域气候模式系统回报的多年平均夏季西太平洋副热带高压与观测更为接近是其对2013年夏季极端高温事件预测能力提高的关键所在。
Abstract:The 28 year hindcast experiments (1983-2010) and the 2013 summer prediction are performed by using regional climate model (RegCM3) which is embedded in the global atmosphere ocean coupled model (BCC_CM1.0) whose climatological means are adjusted based on the NCEP R2 reanalysis datasets. A traditional dynamical downscaling (TDD) parallel run by using RegCM3 that is driven by original BCC_CM1.0 output is also conducted. The results indicate that after using GCM (Global Climate Model) bias corrected method, the capability of hindcasting multi year mean summer temperature and precipitation is greatly improved. Compared to TDD approach, although the predictability of temperature anomaly in northeastern China declines, the prediction of summer extreme heat event over the central part of Eastern China in 2013 is remarkably enhanced. The enhanced performance of hindcasting multi year averaged Western Pacific subtropical high (WPSH) mainly leads to the improvement of predicting summer extreme heat event in 2013.
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基金项目:国家自然科学基金项目(41205060和41571044)、公益性行业(气象)科研专项(GYHY201306021)、国家重大基础研究计划项目(2012CB956000)、中国科学院战略性先导科技专项子课题(XDA05090204)、江苏省普通高校研究生科研创新计划项目(CXLX12_0492)和上海市气象局研究型业务专项(YJ201502)共同资助
引用文本:
董广涛,陈葆德,陈伯民,史军,2016.边界强迫场订正的区域气候模式对2013年夏季中国东部极端高温预测的改进试验[J].气象,42(1):97-106.
DONG Guangtao,CHEN Baode,CHEN Bomin,SHI Jun,2016.The Improvement of Predicting Extreme Heat Event of Eastern China in Summer 2013 Through Correcting Lateral Boundary Condition of Regional Climate Model[J].Meteor Mon,42(1):97-106.