The Sensitivity of Springtime Arctic Mixed-Phase Stratocumulus Clouds to Surface-Layer and Cloud-Top Inversion-Layer Moisture Sources
The Sensitivity of Springtime Arctic Mixed-Phase Stratocumulus Clouds to Surface-Layer and Cloud-Top Inversion-Layer Moisture Sources
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DOI：
10.1175/jas-d-13-0179.1
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发表时间：
2014-01
影响因子：
3.1
通讯作者：
A. Solomon;M. Shupe;O. Persson;H. Morrison;T. Yamaguchi;P. Caldwell;G. Boer
中科院分区：
文献类型：
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作者：
A. Solomon;M. Shupe;O. Persson;H. Morrison;T. Yamaguchi;P. Caldwell;G. Boer
摘要：在这项研究中，采用一系列理想化的大涡模拟来了解云顶和云下层水分源对北极混合相层积云（AMPS）云系统中微物理-辐射-动力反馈的相对影响。本研究重点关注 2008 年 4 月 8 日阿拉斯加巴罗附近间接和半直接气溶胶活动期间对持续性单层 AMPS 云层的观测得出的案例。水分和湿静态能量预算用于检查混合相云中冰的潜在影响、与作为云系统水分来源的温度倒转一致的比湿度倒转，以及混合层顶部上方云液态水的存在。这项研究表明 AMPS 对水分源的变化具有显着的不敏感性。当上层空气最初干燥时，辐射冷却和湍流夹带会增加从表面层进入的水分。当表层干燥后...
AbstractIn this study, a series of idealized large-eddy simulations is used to understand the relative impact of cloud-top and subcloud-layer sources of moisture on the microphysical–radiative–dynamical feedbacks in an Arctic mixed-phase stratocumulus (AMPS) cloud system. This study focuses on a case derived from observations of a persistent single-layer AMPS cloud deck on 8 April 2008 during the Indirect and Semi-Direct Aerosol Campaign near Barrow, Alaska. Moisture and moist static energy budgets are used to examine the potential impact of ice in mixed-phase clouds, specific humidity inversions coincident with temperature inversions as a source of moisture for the cloud system, and the presence of cloud liquid water above the mixed-layer top. This study demonstrates that AMPS have remarkable insensitivity to changes in moisture source. When the overlying air is dried initially, radiative cooling and turbulent entrainment increase moisture import from the surface layer. When the surface layer is dried in...