Quantifying the Influence of Cloud Radiative Feedbacks on Arctic Surface Warming Using Cloud Locking in an Earth System Model
Quantifying the Influence of Cloud Radiative Feedbacks on Arctic Surface Warming Using Cloud Locking in an Earth System Model
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DOI：
10.1029/2020gl089207
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发表时间：
2020-07
影响因子：
5.2
通讯作者：
E. Middlemas;J. Kay;B. Medeiros;E. Maroon
中科院分区：
文献类型：
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作者：
E. Middlemas;J. Kay;B. Medeiros;E. Maroon
了解云层对放大的北极表面变暖的影响仍然是一个重要的尚未解决的研究问题。在这里，这种云影响通过禁用云辐射反馈或在最先进和有充分记录的模型中的“云锁定”来直接量化。通过有云锁定和无云锁定的理想温室气体变暖实验的比较，评估了北极和全球云反馈的影响。全球云反馈使全球和北极变暖增加了约25%。相比之下，禁用北极云反馈对北极和全球表面变暖的影响微乎其微。有趣的是，非云辐射反馈的总和不会随着全球或仅限于北极的云锁定而改变。值得注意的是，北极云反馈的影响可能被低估了，因为像许多模型一样，这里使用的模型低估了高纬度过冷云液体。更广泛地说，这项工作在一个特征明确的模型中展示了区域和全球云锁定的价值。
Understanding the influence of clouds on amplified Arctic surface warming remains an important unsolved research problem. Here, this cloud influence is directly quantified by disabling cloud radiative feedbacks or “cloud locking” within a state‐of‐the‐art and well‐documented model. Through comparison of idealized greenhouse warming experiments with and without cloud locking, the influence of Arctic and global cloud feedbacks is assessed. Global cloud feedbacks increase both global and Arctic warming by around 25%. In contrast, disabling Arctic cloud feedbacks has a negligible influence on both Arctic and global surface warming. Interestingly, the sum of noncloud radiative feedbacks does not change with either global or Arctic‐only cloud locking. Notably, the influence of Arctic cloud feedbacks is likely underestimated, because, like many models, the model used here underestimates high‐latitude supercooled cloud liquid. More broadly, this work demonstrates the value of regional and global cloud locking in a well‐characterized model.