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首页> 外文期刊>Surveys in Geophysics: An International Review Journal of Geophysics and Planetary Sciences >Response of a Coupled Ocean-Atmosphere Model to Greenland Ice Melting
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Response of a Coupled Ocean-Atmosphere Model to Greenland Ice Melting

机译：海洋-大气耦合模型对格陵兰冰融化的响应

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摘要

We investigate the transient response of the global coupled ocean-atmosphere system to enhanced freshwater forcing representative of melting of the Greenland ice sheets. A 50-year long simulation by a coupled atmosphere-ocean general circulation model (CGCM) is compared with another of the same length in which Greenland melting is prescribed. To highlight the importance of coupled atmosphere-ocean processes, the CGCM results are compared with those of two other experiments carried out with the oceanic general circulation model (OGCM). In one of these OGCM experiments, the prescribed surface fluxes of heat, momentum and freshwater correspond to the unperturbed simulation by the CGCM; in the other experiment, Greenland melting is added to the freshwater flux. The responses by the CGCM and OGCM to the Greenland melting have similar patterns in the Atlantic, albeit the former having five times larger amplitudes in sea surface height anomalies. The CGCM shows likewise stronger variability in all state variables in all ocean basins because the impact of Greenland melting is quickly communicated to all ocean basins via atmospheric bridges. We conclude that the response of the global climate to Greenland ice melting is highly dependent on coupled atmosphere-ocean processes. These lead to reduced latent heat flux into the atmosphere and an associated increase in net freshwater flux into the ocean, especially in the subpolar North Atlantic. The combined result is a stronger response of the coupled system to Greenland ice sheet melting.
机译：我们调查了全球耦合的海洋-大气系统对增强淡水的瞬态响应，这代表了格陵兰冰原的融化。通过大气海洋耦合环流模型（CGCM）进行的长达50年的模拟与另一个规定了格陵兰融化的相同长度的模拟进行了比较。为了强调大气-海洋耦合过程的重要性，将CGCM结果与使用海洋总环流模型（OGCM）进行的其他两个实验的结果进行了比较。在这些OGCM实验之一中，规定的表面热量，动量和淡水通量与CGCM的无扰动模拟相对应。在另一个实验中，将格陵兰融化添加到淡水通量中。 CGCM和OGCM对格陵兰融化的反应在大西洋具有相似的模式，尽管前者在海面高度异常中的振幅大五倍。 CGCM在所有海盆的所有状态变量中同样显示出较强的可变性，因为格陵兰融化的影响通过大气桥迅速传达给所有海盆。我们得出的结论是，全球气候对格陵兰岛冰融化的响应高度依赖于大气-海洋耦合过程。这些导致潜入大气的潜热通量减少，并导致进入海洋的净淡水通量增加，特别是在北极亚极地区。综合结果是耦合系统对格陵兰冰盖融化的响应更强。

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