Zhang Yixiao, Bloch-Johnson Jonah, Romps David M, Abbot Dorian S
Department of the Atmospheric and Oceanic Sciences Peking University Beijing China.
DNCAS-Climate University of Reading Reading UK.
J Adv Model Earth Syst. 2021 Nov;13(11):e2021MS002505. doi: 10.1029/2021MS002505. Epub 2021 Oct 30.
The high computational cost of Global Climate Models (GCMs) is a problem that limits their use in many areas. Recently an inverse climate modeling (InvCM) method, which fixes the global mean sea surface temperature (SST) and evolves the mixing ratio to equilibrate climate, has been implemented in a cloud-resolving model. In this article, we apply InvCM to ExoCAM GCM aquaplanet simulations, allowing the SST pattern to evolve while maintaining a fixed global-mean SST. We find that InvCM produces the same climate as normal slab-ocean simulations but converges an order of magnitude faster. We then use InvCM to calculate the equilibrium for SSTs ranging from 290 to 340 K at 1 K intervals and reproduce the large increase in climate sensitivity at an SST of about 315 K at much higher temperature resolution. The speedup provided by InvCM could be used to equilibrate GCMs at higher spatial resolution or to perform broader parameter space exploration in order to gain new insight into the climate system. Additionally, InvCM could be used to find unstable and hidden climate states, and to find climate states close to bifurcations such as the runaway greenhouse transition.
全球气候模型（GCMs）的高计算成本是一个限制其在许多领域应用的问题。最近，一种逆气候建模（InvCM）方法已在云分辨模型中得以应用，该方法固定全球平均海表面温度（SST）并使混合比演化以平衡气候。在本文中，我们将InvCM应用于ExoCAM GCM水行星模拟，使SST模式在保持固定全球平均SST的同时演化。我们发现InvCM产生的气候与正常平板海洋模拟相同，但收敛速度快一个数量级。然后，我们使用InvCM以1K间隔计算290至340K范围内SST的平衡，并在更高的温度分辨率下重现了约315K的SST时气候敏感性的大幅增加。InvCM提供的加速可用于在更高空间分辨率下平衡GCMs或进行更广泛的参数空间探索，以便对气候系统获得新的见解。此外，InvCM可用于发现不稳定和隐藏的气候状态，以及找到接近诸如失控温室转变等分岔点的气候状态。
