Can reducing the incoming energy flux over the Southern Ocean in a CGCM improve its simulation of tropical climate?
Can reducing the incoming energy flux over the Southern Ocean in a CGCM improve its simulation of tropical climate?
复制标题
DOI：
10.1002/2016gl071150
复制
发表时间：
2016-10-28
影响因子：
5.2
通讯作者：
Toniazzo, Thomas
中科院分区：
文献类型：
--
作者：
Mechoso, Carlos R.;Losada, Teresa;Toniazzo, Thomas
大气-海洋环流模式（CGCM）显示出重要的系统误差。在赤道以南的海洋上，热带地区的模拟降水量通常被高估，而在过于温暖的海面温度（SST）之上，层积云（SCu）被低估。在热带外，南大洋的SST也太温暖了。我们认为，改善这些outtratrophic误差在CGCM可以导致一个改进的模式的性能在热带地区的成功模拟的敏感性SCU底层SST的依赖。我们的论点得到了支持的非常不同的响应与两个CGCM的理想化减少太阳辐射通量入射在大气层顶部的南大洋。结果表明，两个模式的局地扰动影响非常相似，但SCu-SST反馈较强的模式对南亚热带SCu区SST的削减作用较强。
Atmosphere-ocean general circulation models (CGCMs) show important systematic errors. Simulated precipitation in the tropics is generally overestimated over the oceans south of the equator, and stratocumulus (SCu) clouds are underestimated above too warm sea surface temperatures (SSTs). In the extratropics, SSTs are also too warm over the Southern Ocean. We argue that ameliorating these extratropical errors in a CGCM can result in an improved model's performance in the tropics depending upon the success in simulating the sensitivity of SCu to underlying SST. Our arguments are supported by the very different response obtained with two CGCMs to an idealized reduction of solar radiation flux incident at the top of the atmosphere over the Southern Ocean. It is shown that local perturbation impacts are very similar in the two models but that SST reductions in the SCu regions of the southern subtropics are stronger in the model with the stronger SCu-SST feedbacks.