在有机影响的云滴激活中,表面张力胜过溶解物效应
Jurgita Ovadnevaite1, Andreas Zuend2, Ari Laaksonen3,4
1School of Physics and Centre for Climate and Air Pollution Studies, National University of Ireland Galway, Galway, Ireland.
Nature
|June 22, 2017
概括
有机表面活性剂可以通过比预期的更低地降低表面张力来显著增加云滴形成,从而影响气候模型. 这种现象是由气溶颗粒的相分离驱动的,导致云凝结核 (CCN) 度更高.
科学领域:
- 大气化学
- 云物理
- 气候科学
背景情况:
- 经典的科勒理论描述了基于罗尔特和凯尔文效应的云凝聚核 (CCN) 激活.
- 已知有机表面活性剂降低了表面张力,影响了CCN的激活.
- 溶解物度和液滴大小之间的相互作用会影响激活潜力.
研究的目的:
- 研究有机表面活性剂对环境空气中CCN激活的影响.
- 探索液体-液体相分离在气溶粒子行为中的作用.
- 量化CCN度增强对云特性和气候模型的影响.
主要方法:
- 使用了观察证据和理论模型.
- 分析的重点是降低表面张力和减少劳尔特效应之间的平衡.
- 将分相效应纳入激活热力学进行了.
主要成果:
- 通过有机表面活性剂降低表面张力可以胜过环境条件下的劳尔特效应降低.
- 液相分离解释了持续的表面张力降低和缺乏罗尔特效应的减少.
- 观察和建模的CCN数量度高于标准气候模型预测的十倍.
结论:
- 气溶颗粒中的相分离显著增强了CCN激活.
- 目前的气候模型可能低估了CCN度,因为忽视了相隔.
- 对气溶与云相互作用的准确表示对于改善气候变化预测至关重要.
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