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首页> 外文期刊>Paleoceanography >Modeled Influence of Land Ice and CO_2 on Polar Amplification and Paleoclimate Sensitivity During the Past 5 Million Years
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Modeled Influence of Land Ice and CO_2 on Polar Amplification and Paleoclimate Sensitivity During the Past 5 Million Years

机译：过去500万年陆地冰和CO_2对极地放大和古气动敏感性的建模影响

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Polar amplification and paleoclimate sensitivity (S) have been the subject of many paleoclimate studies. While earlier studies inferred them as single constant parameters of the climate system, there are now indications that both are conditioned by the type of forcing. Moreover, they might be affected by fast feedback mechanisms that have different strengths depending on the background climate. Here we use the intermediate complexity climate model CLIMBER-2 to study the influence of land ice and CO_2 on polar amplification and S. We perform transient 5-Myr simulations, forced by different combinations of insolation, land ice, and CO_2. Our results provide evidence that land ice and CO_2 changes have different effects on temperature, both on the global mean and the meridional distribution. Land ice changes are mainly manifested in the high latitudes of the Northern Hemisphere. They lead to higher northern polar amplification, lower southern polar amplification, and lower S than more homogeneously distributed CO_2 forcing in CLIMBER-2. Furthermore, toward colder climates northern polar amplification increases and consequently southern polar amplification decreases, due to the albedo-temperature feedback. As an effect, a global average temperature change calculated from high-latitude temperatures by using a constant polar amplification would lead to substantial errors in our model setup. We conclude that to constrain feedback strengths and climate sensitivity by paleoclimate data, the underlying forcing mechanisms and background climate states have to be taken into consideration.
机译：极性扩增和古古典敏感性是许多古古典研究的主题。虽然早期研究推断出作为气候系统的单一常数参数，但现在有适应症的迹象表明两者都是由强迫的类型调节。此外，它们可能受到具有不同优点的快速反馈机制的影响，这取决于背景气候。在这里，我们使用中间复杂性气候模型攀登 - 2研究土地冰和CO_2对极性放大的影响。我们执行瞬态5-MYR模拟，由不同的缺失，陆冰和CO_2的不同组合。我们的结果提供了陆地冰和CO_2变化对温度不同的证据，也是全球平均值和经历分布的不同影响。陆地冰变化主要表现在北半球的高纬度。它们导致北部极性扩增，低南部极性扩增，低于爬升机-2中的更均匀分布的CO_2。此外，由于反应温度反馈，朝向较冷的气候北极扩增增加，因此Southern极性放大减少。作为一种效果，通过使用恒定极性放大器的高纬度温度计算的全局平均温度变化将导致我们的模型设置中的大量误差。我们得出结论，通过古平衡数据约束反馈优势和气候敏感性，必须考虑潜在的迫使机制和背景气候国家。

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