Effects of Circulation on Tropical Cloud Feedbacks in High-Resolution Simulations
Effects of Circulation on Tropical Cloud Feedbacks in High-Resolution Simulations
复制标题
高分辨率模拟中环流对热带云反馈的影响
DOI：
10.1029/2022ms003516
复制
发表时间：
2023
影响因子：
6.8
通讯作者：
Mackie A
中科院分区：
文献类型：
--
作者：
Mackie A
云对全球变暖反应的不确定性仍然是减少气候敏感性不确定性的一个重大障碍。一个关键的问题是，动力分量在多大程度上是由于环流的变化，而不是云的热力学性质的变化，有助于总的云反馈。在这里，分析了一系列云解析模型的模拟，以量化环流变化对热带云反馈的影响。云反馈的动态分量对于某些模式来说是重要的，并且由海表面温度（SST）引起的环流变化和云与环流之间气候关系的非线性控制。我们发现上升区域在响应SST变化时缩小或扩大的程度存在显着的模型间差异，我们将其与模型间长波和短波动态分量的差异联系起来。上升区变化的多样性与上升区非辐射非绝热加热的模型间差异相耦合。
Uncertainty in the response of clouds to global warming remains a significant barrier to reducing uncertainty in climate sensitivity. A key question is the extent to which the dynamic component—that which is due to changes in circulation rather than changes in the thermodynamic properties of clouds—contributes to the total cloud feedback. Here, simulations with a range of cloud‐resolving models are analyzed to quantify the impact of circulation changes on tropical cloud feedbacks. The dynamic component of the cloud feedback is substantial for some models and is controlled both by sea surface temperature (SST) induced changes in circulation and nonlinearity in the climatological relationship between clouds and circulation. We find notable inter‐model differences in the extent to which ascending regions narrow or expand in response to a change in SST, which we link to differences in the longwave and shortwave dynamic components across models. The diversity of changes in ascent area is coupled to intermodel differences in non‐radiative diabatic heating in ascending regions.