酸度对无机有机混合液滴冰核的作用
Ziying Lei1, Bo Chen1, Sarah D Brooks1
1Department of Atmospheric Science, Texas A&M University, College Station, Texas 77843, United States.
概括
气溶的酸性阻碍了水滴中的冰核形成,影响了云的形成. 增加的酸度和二硫酸盐的存在降低了冰核化效率,受滴滴形态和粘度的影响.
科学领域:
- 大气中的化学成分
- 物理化学 物理化学
- 云的微物理学 云的微物理学
背景情况:
- 气溶酸度影响化学反应和人类健康.
- 酸度会影响气溶的冰核化特性,影响云形成.
研究的目的:
- 研究pH对无机和有机气溶中的冰核形成的影响.
- 了解酸度如何改变冰核形成能力和云形成.
主要方法:
- 结合冰核化技术与拉曼显微光谱学.
- 研究的气溶在pH值范围为-0.1到5.5.5的范围内.
- 分析了无机 (硫酸,硫酸) 和有机 (糖糖,二甲酸,PEG 400,1,2,6-二醇) 气溶.
主要成果:
- 增加的酸度降低了冰的核化能力.
- 在硫酸,硫酸硫酸和糖系统中观察到均质核化.
- 在混合系统中观察到的液体-液体相分离和核心外形态,核心中开始冷.
- 双硫酸盐的存在与降低冰核化效率相关.
- 形态和粘度影响冰核形成的特性.
结论:
- 酸度是控制大气气溶中的冰核形成的关键因素.
- 这些发现提供了对气溶酸度在大气冰云形成中的作用的见解.
- 了解这些过程对于气候建模和空气质量评估至关重要.
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