Sensitivity of idealized mixed‐phase stratocumulus to climate perturbations
Sensitivity of idealized mixed‐phase stratocumulus to climate perturbations
复制标题
理想化混合相层积云对气候扰动的敏感性
DOI：
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发表时间：
2020
影响因子：
8.9
通讯作者：
C. Kaul
中科院分区：
文献类型：
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作者：
Xiyue Zhang;T. Schneider;C. Kaul
利用明确解析边界层湍流和云的大涡模拟（LESs）来探索理想化北极边界层云对气候扰动的敏感性。LESs侧重于类似春季的情况，此时海冰表面热通量较弱，云辐射效应主要由长波效应主导。在低气压区，凝结水路径随边界层温度和自由对流层相对湿度的增加而增加，但随逆温强度的增大而减小。云性质对LES所显示的环境变量的依赖性可以通过混合层模式在很大程度上再现。混合层模式分析表明，液态水路径随着变暖而增加，因为变暖下液态水梯度的增加过度补偿了云的几何变薄。这种响应与副热带层积云对变暖的响应形成对比，在变暖条件下，层积云的液态水路径随着云层呈几何型变薄而减少。结果表明，用于解释低纬度BL云对气候变化响应的方法也可以解释理想化北极BL云的变化，尽管亚热带和北极云具有不同的热力学机制。
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.
影响因子：
6.8
作者：
Zhaoyi Shen;K. Pressel;Zhihong Tan;T. Schneider
通讯作者：
Zhaoyi Shen;K. Pressel;Zhihong Tan;T. Schneider
影响因子：
4.4
作者：
Sherwood, Steven C.;Ingram, William;O'Gorman, Paul A.
通讯作者：
O'Gorman, Paul A.