A coupled atmosphere/ice/ocean model for the North Sea and the Baltic Sea
A coupled atmosphere/ice/ocean model for the North Sea and the Baltic Sea
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DOI：
10.1007/s00382-003-0322-8
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发表时间：
2003-05
期刊：
影响因子：
4.6
通讯作者：
Corinna Schrum;U. Hübner;Daniela Jacob;R. Podzun
中科院分区：
文献类型：
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作者：
Corinna Schrum;U. Hübner;Daniela Jacob;R. Podzun
利用波罗的海和北海区域大气/冰/海洋耦合模式进行了一次后报试验。该实验是在一个完整的季节周期进行的，并通过与独立数据的比较进行验证。进一步与大气和海洋子模式进行了非耦合模式试验，并分析了大气全球气候变率的不同耦合和区域化策略对区域系统的敏感性。总体而言，可以表明，区域耦合大气/冰/海洋模式在整个季节周期内是稳定的。此外，在区域尺度上的耦合被证明是一个明显的改善与大气模型的非耦合运行相比。由于耦合的稳定作用，气候模式（没有重新初始化）的区域模式结果与北海和波罗的海的大气再分析结果质量相似。在预报模式中，即当没有观测数据可用于通过同化来改进模式估计时，可以预期，使用区域耦合模式系统将大大提高预报质量。然而，海洋子系统对不同区域化策略的响应表现出一些差异，这对耦合系统的局部应用很重要。本研究确定了三个不同的敏感表面参数：海表温度和连接海冰，显示出相当大的敏感性区域化以及耦合，和海表海拔，显示出较高的敏感性区域化的短期变化。
A hindcast experiment with a regional coupled atmosphere/ice/ocean model for the Baltic and North seas has been carried out. The experiment was performed over a full seasonal cycle and verified by comparisons with independent data. Further un-coupled model runs with the atmospheric and oceanic sub-models have been made and analyzed to evaluate the sensitivity of different coupling and regionalization strategies of atmospheric global climate variability to the regional system. Overall it could be shown that the regional coupled atmosphere/ice/ocean model is stable over a full seasonal cycle. Furthermore, the coupling on the regional scale turned out to be a clear improvement compared to the un-coupled run with the atmospheric model. The regional model results in the climate mode (without re-initialization) are of similar quality compared to atmospheric re-analysis for the North and Baltic seas, due to the stabilizing effect of the coupling. In the forecast mode, i.e. when no observational data are available to improve model estimates by assimilation, it can be expected that the usage of a regional coupled model system will improve the qualitiy of predictions strongly. Nevertheless, the response of the oceanic sub-system on the different regionalization strategies showed some differences important for local applications of the coupled system. Three different sensitive surface-parameters have been identified by the present study: the sea surface temperature and connected the sea ice, showing considerable sensitivity on the regionalization as well as on the coupling, and the sea surface elevation, showing a high sensitivity for the short term variability on the regionalization.