A Lagrangian Cloud Model for the Study of Marine Fog
A Lagrangian Cloud Model for the Study of Marine Fog
复制标题
研究海洋雾的拉格朗日云模型
DOI：
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发表时间：
2021
影响因子：
4.3
通讯作者：
C. Wainwright
中科院分区：
文献类型：
--
作者：
D. Richter;Theodore MacMillan;C. Wainwright
将大涡模拟模式与拉格朗日云模式耦合，对海雾进行了数值模拟。在这个模型中，气溶胶和液滴处理从拉格朗日参考系，在传统的散装和箱微物理模型。通过冷凝的液滴生长由科勒理论和液滴局部的环境条件决定。耦合到蒸汽和温度场的流动，确保质量，动量和能量之间的空气和液滴阶段的守恒。基于最近的C-FOG现场活动，进行了模拟，突出了这种类型的模型的好处和潜力。通过用测量的气溶胶尺寸分布初始化模拟并对多个峰的化学成分进行假设，模拟为C-FOG期间观察到的双峰液滴分布提供了清晰的解释：高过饱和度水平导致几乎所有粗模式气溶胶的冷凝生长（据推测由海盐组成）以及大量的积累模式气溶胶（据推测为大陆来源，吸湿性较低）。所得到的液滴分布中的最大峰值是由具有高吸湿性的粗模式气溶胶产生的，而第二峰值仅可能是由于最大峰值对雾内饱和度的有限影响。因此，对于模拟的过饱和度水平，这是有限数量的粗模式气溶胶，这是一个更大的第二个高峰的出现负责。
A large-eddy simulation model is coupled with a Lagrangian cloud model to study marine fog. In this model, aerosols and droplets are treated from a Lagrangian frame of reference, in contrast to the traditional bulk and bin microphysical models. Droplet growth via condensation is governed by Köhler theory and environmental conditions local to the droplet. Coupling to the vapour and temperature fields of the flow ensures mass, momentum, and energy conservation between the air and droplet phases. Based on the recent C-FOG field campaign, a simulation is performed which highlights the benefits and potential of this type of model. By initializing the simulation with the measured aerosol size distribution and making assumptions about the chemical composition of the multiple peaks, the simulations provide a clear explanation for the observed bimodal droplet distribution during C-FOG: high supersaturation levels cause condensational growth of nearly all coarse-mode aerosols (presumed to be composed of marine salt), as well as a large number of accumulation model aerosols (presumed to be of continental origin with a lower hygroscopicity). The largest peak in the resulting droplet distribution is created from coarse-mode aerosols with high hygroscopicity, while the secondary peak is only possible due to the limited impact of the largest peak on saturation levels inside the fog. Thus, for the simulated levels of supersaturation, it is the limited number of coarse-mode aerosols which is responsible for the emergence of a larger second peak.
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影响因子：
3.1
作者：
F. Hoffmann;Y. Noh;S. Raasch
通讯作者：
F. Hoffmann;Y. Noh;S. Raasch
影响因子：
6.8
作者：
Morrison H;van Lier-Walqui M;Fridlind AM;Grabowski WW;Harrington JY;Hoose C;Korolev A;Kumjian MR;Milbrandt JA;Pawlowska H;Posselt DJ;Prat OP;Reimel KJ;Shima SI;van Diedenhoven B;Xue L
通讯作者：
Xue L
影响因子：
5.1
作者：
S. Unterstrasser;F. Hoffmann;Marion Lerch
通讯作者：
S. Unterstrasser;F. Hoffmann;Marion Lerch
影响因子：
5.5
作者：
Hoffmann, F.;Raasch, S.;Noh, Y.
通讯作者：
Noh, Y.
基于嵌入式拉格朗日云模型更好地表示大涡模拟中的雾微物理
影响因子：
2.9
作者：
Schwenkel;B. Maronga
通讯作者：
B. Maronga