全球海洋模式对CFC-11分布的初步模拟研究  

Preliminary Study of the Simulated Distribution of CFC-11 in the Global Ocean Circulation Model

作　　者：李阳春[1] 徐永福[1] 赵亮[2] 王明星[1] 

机构地区：[1]中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室 [2]中国海洋大学物理海洋研究所,青岛266003

出　　处：《大气科学》2006年第4期671-681,共11页Chinese Journal of Atmospheric Sciences

基　　金：中国科学院知识创新工程重大项目KZCX1-SW-01-16;中国科学院"引进国外杰出人才"计划项目"全球环境变化-碳循环研究"

摘　　要：使用中国科学院大气物理研究所(IAP)三十层全球海洋模式(L30T63)研究了CFC-11在全球海洋中的吸收和分布,初步讨论了决定其分布特征的可能因素。该模式采用自由表面结构和Gent-McWilliams中尺度示踪物参数化方案。通过对控制试验得到的CFC-11模拟结果分析可知,CFC-11海表浓度受温度影响显著,其分布形状大致与温度相似,但梯度相反。通量的分布受温度影响很大,且表现出很明显的季节变化特征,如不饱和区一般出现在冬季海区的中层水形成处或者强对流混合存在的区域。另外,对CFC-11的模拟结果与三个大洋的五个断面航测资料做了对比,发现模拟结果与观测资料吻合较好,能比较清楚地反映CFC-11输送与等密度面垂直分布以及环流场的密切关系,如在南大洋50°S以北至35°S以南等密度面的向下加深区是CFC-11的主要贮存区等。与大多数前人的工作相比,该模拟结果较好地反映了CFC-11在南大洋的分布特征。从这些反映出该模式对于大洋十年尺度物质交换与海洋内部输送的模拟是比较准确的。Ocean general circulation models （OGCMs） are widely used to understand the role of the ocean as a sink for greenhouse gases. To get realistic amounts of absorbed gases, it is necessary to assess the ability of ocean models simulating ocean realistic processes, especially the oceanic ventilation. Chlorofluorocarbons （CFCs） are very useful tracers for the study of oceanic ventilation on decadal timescales. As a result, many OGCMs have been used to study the oceanic uptake and storage of CFCs, including the influences of mesoscale tracer mixing scheme on the distribution of the CFCs concentration. However, a large difference still exists between the observation and simulated results of CFCs, and even between the models. To improve the ability of estimate of oceanic CFC inventories, the further research is required, including use of different models. The uptake and distribution of CFC-11 are investigated in a thirty-level global ocean general circulation model （L30T63）, which is developed by the Institute of Atmos-pheric Physics, Chinese Academy of Sciences. The model employs the free surface formulation and the Gent-McWillianas parameterization of mesoscale mixing of tracers. The possible factors that determine the features of CFC-11 distributions are preliminarily discussed in this paper. In the control numerical experiment, the model is spun up from climatological initial conditions, and it is run for 1050 years to obtain equilibration. On the basis of the 1050 years simulated results, an additional passive tracer of CFC-11 is included in the model, and the model is run for another 55 years from 1944 to 1998. CFC-11 enters the ocean by the air-sea gas exchange at the ocean surface. According to the simulated results of CFC-11 in the control numerical experiment, the distributions of CFC-11 concentrations in the ocean surface are remarkably affected by sea surface temperature. The pattern of CFC-11 distributions is similar to that of sea surface temperature, but the direction of gradient is converse. Th

关 键 词：全球海洋 海洋环流模式 CFC-1 1 Gent-McWilliams参数化 

分 类 号：P732[天文地球—海洋科学]