Large‐eddy simulations (LESs) that explicitly resolve boundary layer (BL) turbulence and clouds are used to explore the sensitivity of idealized Arctic BL clouds to climate perturbations. The LESs focus on conditions resembling springtime, when surface heat fluxes over sea ice are weak, and the cloud radiative effect is dominated by the long‐wave effect. In the LES, the condensed water path increases with BL temperature and free‐tropospheric relative humidity, but it decreases with inversion strength. The dependencies of cloud properties on environmental variables exhibited by the LES can largely be reproduced by a mixed‐layer model. Mixed‐layer model analysis shows that the liquid water path increases with warming because the liquid water gradient increase under warming overcompensates for geometric cloud thinning. This response contrasts with the response of subtropical stratocumulus to warming, whose liquid water path decreases as the clouds thin geometrically under warming. The results suggest that methods used to explain the response of lower‐latitude BL clouds to climate change can also elucidate changes in idealized Arctic BL clouds, although subtropical and Arctic clouds occupy different thermodynamic regimes.

中文翻译：

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理想化混合相平流层对气候扰动的敏感性

大涡模拟（LESs）可显式解决边界层（BL）的湍流和云层，用于探索理想的北极BL云对气候扰动的敏感性。LES集中在类似于春季的条件上，当时海冰上的表面热通量较弱，而云辐射效应主要由长波效应主导。在LES中，冷凝水路径随BL温度和对流层相对湿度的增加而增加，但随反演强度的增加而减小。LES所显示的云特性对环境变量的依赖性可以通过混合层模型来再现。混合层模型分析表明，随着变暖，液态水路径增加，因为在变暖下液态水梯度的增加过度补偿了几何云的稀疏。该响应与亚热带平流层积云对变暖的响应形成了鲜明对比，后者随着云层在变暖下呈几何形状变薄，其液态水路径减少。结果表明，用于解释低纬度BL云对气候变化的响应的方法也可以阐明理想的北极BL云的变化，尽管亚热带和北极云占据了不同的热力学状态。