| 利用大气环流模式模拟北大西洋海温异常强迫响应 |
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| 引用本文： | 李建,周天军,宇如聪.利用大气环流模式模拟北大西洋海温异常强迫响应[J].大气科学,2007,31(4):561-570. |
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| 作者姓名： | 李建 周天军 宇如聪 |
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| 作者单位： | 1.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,北京,100029;中国科学院研究生院,北京,100049 |
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| 基金项目： | 国家重点基础研究发展规划项目2005CB321703，中国科学院创新团队国际合作伙伴计划“气候系统模式研发及应用研究”，国家自然科学基金资助项目40375029、40233031 |
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| 摘 要： | 北大西洋地区的海温异常能够在多大程度上对大气产生影响，一直是一个有争议的问题。作者利用伴随北大西洋涛动出现的海温异常对大气环流模式CAM2.0.1进行强迫，考察了模式在冬季（12月、1月和2月）对三核型海温异常的响应。通过与欧洲中期天气预报中心提供的再分析资料的对比，发现该模式可以通过海温强迫在一定程度上再现具有北大西洋涛动特征的温度场和环流场。在北大西洋及其沿岸地区，模式模拟出了三核型的准正压响应，与经典的北大西洋涛动型大气异常是一致的。模式结果与北大西洋地区大气内部主导模态的差别主要体现在两个方面:一是异常中心位置多偏向于大洋上空，在陆地上的异常响应强度很弱；二是高纬地区对海温异常的响应不显著，没有强迫出与实际的大气模态相对应的异常中心，表明该地区海洋的反馈作用较弱。
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| 关 键 词： | 北大西洋 涛动 三核型海温异常 大气环流模式 |
| 文章编号： | 1006-9895（2007）04-0561-10 |
| 修稿时间： | 2006-01-252006-03-27 |
Atmospheric Response to the North Atlantic SST Anomalies in CAM2 |
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| LI Jian,ZHOU Tian-Jun and YU Ru-Cong.Atmospheric Response to the North Atlantic SST Anomalies in CAM2[J].Chinese Journal of Atmospheric Sciences,2007,31(4):561-570. |
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| Authors: | LI Jian ZHOU Tian-Jun and YU Ru-Cong |
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| Institution: | State Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029; 2 Graduate University of Chinese Academy of Sciences, Beijing 100049 ;3 China Meteorological Administration, Beijing 100081 |
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| Abstract: | It has been well known that the tripole-pattern interannual SST anomalies in the North Atlantic are principally forced by the dominant modes of atmosphere variability,the North Atlantic Oscillation(NAO).But to what extent the North Atlantic SST anomalies can affect the atmosphere remains to be an open problem.To estimate the potential feedback of the oceanic surface conditions onto the atmosphere in a GCM is the main motivation of this work.In this paper,the atmospheric GCM CAM2.0.1 is forced by the tripole-SST anomalies,which are associated with NAO.The authors characterize the typical patterns of SST associated with the NAO by constructing SST anomaly composites for positive-minus-negative NAO years.Then,in the following two experiments,the SST anomalies are added and subtracted to the surface climatology respectively.To detect the influence of the SST anomaly in the presence of atmospheric internal variability,the authors perform an ensemble of 8 integrations for each experiment.The integrations differ under different initial conditions.Each integration runs for 7 months,from early autumn to the end of next spring.The model's responses to the SST anomalies in winter(DJF) are compared with the ERA40 reanalysis data.The experiment results show that equivalent barotropic anomalies with meridionally distributed three-cores dominate the North Atlantic area.In comparison with the reanalysis data,it is found that these SST-induced atmospheric anomalies are consistent with the typical pattern of NAO,especially in the low and middle latitudes.Over the North Atlantic,the vertical structures of temperature,height and zonal wind in the model results are very similar to the corresponding fields in the reanalysis data.There are two main differences between the model responses and the reanalysis results.The first one is,in the model simulation,the anomaly centers tend to be located over the ocean area and the responses over the land area are too weak.The second one is the missing of the high latitude anomaly center,which indicates the weak feedback from the ocean in this area.The GCM responses to the SST tripole show asymmetry about the sign of the SST anomalies.Through diagnosing the model outputs,it is found that the GCM CAM2.0.1 can reproduce a NAO-like atmospheric response by the feedback from ocean.So this model can be used in the further research concerning the climate influences of NAO. |
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| Keywords: | the North Atlantic oscillation(NAO) the North Atlantic SST tripole atmospheric general circulation model(AGCM) |
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