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Sensitivity of Climate Feedbacks to Vertical Resolution in a General Circulation Model

Geophysical research letters(2021)SCI 2区

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Cited 5|Views12
Abstract
Many of the current, Coupled Model Intercomparison Project 6 (CMIP6), General Circulation Models (GCMs) show climate sensitivity higher than currently accepted uncertainty ranges. There is a weak correlation between increases in vertical resolution and in climate sensitivity from CMIP5. In particular, the MO Hadley Centre GCM’s vertical resolution has more than doubled, and its climate sensitivity has also increased substantially. We therefore compare estimates of climate sensitivity from the CMIP6 model HadGEM3‐GC3.1‐LL, with 85 levels, and a version with 242 levels. This is far higher resolution than in any previously published simulations with a mainstream GCM, though still less than many scales important for clouds. The climate sensitivity and feedbacks, including the cloud feedback, change little. This suggests that vertical resolution did not drive recent increases in GCM climate sensitivity, though this result should be further tested in other GCMs and over a broader range of resolutions.
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climate change,climate sensitivity,climate feedbacks,GCM,vertical resolution,general circulation model
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要点】:本论文研究了大气环流模型(GCMs)中气候反馈对垂直分辨率的敏感性,并发现尽管垂直分辨率显著提高,气候敏感性和反馈(包括云反馈)并未显著变化,这暗示垂直分辨率的变化并非导致GCMs气候敏感性增高的主要因素。

方法】:研究者对比了CMIP6模型HadGEM3-GC3.1-LL的两个版本,一个具有85个垂直层次,另一个具有242个垂直层次,后者分辨率远高于之前发布的任何主流GCM的模拟。

实验】:实验结果显示,尽管MO Hadley Centre GCM的垂直分辨率加倍,其气候敏感性也有显著提高,但在所研究的HadGEM3-GC3.1-LL模型中,更高分辨率并未带来气候敏感性和反馈的显著变化。该实验使用的数据集为HadGEM3-GC3.1-LL模型,实验结果需要在其他GCMs中进行验证,并扩展到更广泛的分辨率范围。