Coupled Aqua and Ridge Planets in the Community Earth System Model
Coupled Aqua and Ridge Planets in the Community Earth System Model
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DOI：
10.1029/2020ms002418
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发表时间：
2020-11
影响因子：
6.8
通讯作者：
Xiaoning Wu;K. Reed;C. Wolfe;G. Marques;S. Bachman;F. Bryan
中科院分区：
文献类型：
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作者：
Xiaoning Wu;K. Reed;C. Wolfe;G. Marques;S. Bachman;F. Bryan
理想化的模型可以通过减少其复杂性来揭示对地球气候系统的见解。然而，他们的潜力是削弱了稀缺的完全耦合的理想化模型的组成部分可比当代，全面的地球系统模型。为了填补这一空白，我们比较和对比两个理想化的行星，建立在社区地球系统模型（CESM）的简单模型倡议的气候。使用完全耦合的CESM，除了两个极地陆帽之外，Aqua配置是海洋覆盖的，而Ridge配置具有额外的极到极网格单元范围的大陆。与大多数海洋表面温度廓线假设的只有大气层的水行星实验在赤道上的热最大值相反，耦合的Aqua配置的特征是风驱动的赤道上涌的全球冷带，类似于东太平洋冷舌。洋脊上纬向边界的存在导致了热力和环流特征的纬向不对称性，类似于西太平洋和东太平洋的对比。这种纬向不对称性导致了与Aqua截然不同的气候状态，通过云和水蒸气的辐射反馈冷却了0.22 °C。海脊的纬向边界对于产生比Aqua更像地球的气候状态也至关重要，包括大气和海洋环流的特征，热带辐合带的季节循环和纬向热量输送。这两个基本配置的平均气候提供了一个基线，探索其他理想化的海洋几何形状，以及它们的应用程序，调查耦合气候系统中的各种功能和尺度的相互作用。
Idealized models can reveal insights into Earth’s climate system by reducing its complexities. However, their potential is undermined by the scarcity of fully coupled idealized models with components comparable to contemporary, comprehensive Earth System Models. To fill this gap, we compare and contrast the climates of two idealized planets which build on the Simpler Models initiative of the Community Earth System Model (CESM). Using the fully coupled CESM, the Aqua configuration is ocean‐covered except for two polar land caps, and the Ridge configuration has an additional pole‐to‐pole grid‐cell‐wide continent. Contrary to most sea surface temperature profiles assumed for atmosphere‐only aquaplanet experiments with the thermal maximum on the equator, the coupled Aqua configuration is characterized by a global cold belt of wind‐driven equatorial upwelling, analogous to the eastern Pacific cold tongue. The presence of the meridional boundary on Ridge introduces zonal asymmetry in thermal and circulation features, similar to the contrast between western and eastern Pacific. This zonal asymmetry leads to a distinct climate state from Aqua, cooled by ∼2°C via the radiative feedback of clouds and water vapor. The meridional boundary of Ridge is also crucial for producing a more Earth‐like climate state compared to Aqua, including features of atmospheric and ocean circulation, the seasonal cycle of the Intertropical Convergence Zone, and the meridional heat transport. The mean climates of these two basic configurations provide a baseline for exploring other idealized ocean geometries, and their application for investigating various features and scale interactions in the coupled climate system.