doi:  10.3878/j.issn.1006-9895.1806.18146
耦合模式FGOALS-s2海洋同化试验模拟的西北太平洋海气相互作用特征

Ocean-Atmosphere Interaction Characteristics over the Northwestern Pacific Simulated by an Ocean Data Assimilation System Based on the Coupled Model FGOALS-s2
摘要点击 983  全文点击 337  投稿时间:2018-04-08  
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基金:  国家自然科学基金项目41330423,中国科学院国际伙伴计划134111KYSB20160031
中文关键词:  FGOALS模式  西北太平洋  海洋同化  海气相互作用
英文关键词:  FGOALS (Flexible Global Ocean-Atmosphere-Land System)  Northwestern Pacific  Ocean assimilation  Air-sea interaction
           
作者中文名作者英文名单位
江洁JIANG Jie中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室(LASG),北京100029;中国科学院大学,北京100049
周天军ZHOU Tianjun中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室(LASG),北京100029;中国科学院大学,北京100049
吴波WU Bo中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室(LASG),北京100029
邹立维and ZOU Liwei中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室(LASG),北京100029
引用:江洁,周天军,吴波,邹立维.2019.耦合模式FGOALS-s2海洋同化试验模拟的西北太平洋海气相互作用特征[J].大气科学,43(3):467-482,doi:10.3878/j.issn.1006-9895.1806.18146.
Citation:JIANG Jie,ZHOU Tianjun,WU Bo,and ZOU Liwei.2019.Ocean-Atmosphere Interaction Characteristics over the Northwestern Pacific Simulated by an Ocean Data Assimilation System Based on the Coupled Model FGOALS-s2[J].Chinese Journal of Atmospheric Sciences (in Chinese),43(3):467-482,doi:10.3878/j.issn.1006-9895.1806.18146.
中文摘要:
      观测发现,西北太平洋区域夏季降水—SST存在显著的负相关,主要是由于El Niño衰减年西北太平洋异常反气旋持续至夏季,该过程是检验耦合模式性能的重要参照标准。本文利用中国科学院大气物理研究所近期气候预测系统IAP-DecPreS,通过海洋同化试验、大气模式AMIP试验与观测结果的比较,评估海洋同化试验对西北太平洋夏季局地海气相互作用特征的模拟影响。结果表明,海洋同化试验能够模拟出西北太平洋区域夏季降水—SST负相关,但负相关区域范围偏小。其与观测之间的最大差异出现在8月,西北太平洋负降水异常及异常反气旋位置偏东,强度偏弱。这是由于其模拟的El Niño衰减年夏季赤道东印度洋正降水异常偏弱且移动至赤道南侧,对流层增温偏弱,对西太平洋的遥相关作用偏弱。AMIP试验未考虑大气对海洋的反馈作用,不能再现西北太平洋降水—SST负相关,无法模拟出El Niño衰减年夏季西北太平洋异常反气旋。研究表明,海洋同化试验对西北太平洋区域局地海气相互作用特征的模拟能力较AMIP试验有所提升,其对8月西北太平洋降水与环流场的模拟偏差与东赤道印度洋降水模拟偏差有关。
Abstract:
      Observations show evident negative correlation between summer sea surface temperature (SST) and precipitation anomalies over the northwestern Pacific (NWP), which is due to the maintenance of the NWP anomalous anticyclone from the El Niño peak winter to subsequent summer. This process has been a useful metric for assessing the capability of climate models. Based on the near-term climate prediction system of the Institute of Atmospheric Physics (IAP-DecPreS), this study evaluates the result of the ocean data assimilation experiment using the coupled model FGOALS-s2 to simulate the air-sea interaction over the NWP through comparing the result with observations and standalone AGCM (atmospheric general circulation model) simulation. The coupled data assimilation system performs better than AGCM and reasonably reproduces the negative correlation between summer SST and precipitation anomalies over the NWP, although the area with negative correlation coefficient is smaller than the observation, especially in August when the NWP anticyclone is weaker than that in the observation and shifts eastward. Further analysis indicates that the bias is associated with the southward shift and weakening of positive precipitation anomalies over the equatorial eastern Indian Ocean in the El Niño decaying summer. The standalone AGCM experiments fails in simulating the negative correlation between summer SST and precipitation anomalies over the NWP, which is attributed to the absence of atmospheric forcing. Our analysis demonstrates that the ocean assimilation system performs better than the AMIP experiment in simulating the air-sea interaction over the NWP, and the bias in the NWP anticyclone simulation in August is due to the bias in precipitation anomalies over the equatorial eastern Indian Ocean.
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