微塑料被不同菌株 Pseudomonas Syringae 殖民化增加了冰核活动
Carrie Carpenter1, Kelsey Kern2, Regina Hanlon1
1School of Plant and Environmental Sciences, Virginia Tech, Blacksburg, Virginia 24061, United States.
Environmental science & technology
|March 11, 2026
概括
微塑料 (MPs) 在大气中充当冰核粒子. 微生物殖民显著增强了它们的冰核活动,可能会影响云的形成.
科学领域:
- 大气中的化学成分
- 环境科学环境科学
- 微生物学 微生物学
背景情况:
- 微塑料 (MP) 在大气中无处不在.
- MPs可能作为冰核粒子 (INPs) 起作用,可能是由于微生物殖民.
- 了解MP冰核活动 (INA) 对大气过程至关重要.
研究的目的:
- 量化聚钢 (PS) 和聚乙烯 (PE) MP 的 INA.
- 研究表面衰老和微生物殖民对MP INA的影响.
- 确定MP如何影响云相关的冰核形成.
主要方法:
- 评估原始和老化的0.5-100微米PS和100微米PEMP的INA.
- 在国会议员身上培养了*Pseudomonas syringae*菌株.
- 测量了殖民和未殖民国会议员的结温度.
主要成果:
- 未被殖民的MP显示INA,平均结温度在-21.0°C和-23.8°C之间.
- 表面老化 (热水,光氧化) 对INA有轻微影响.
- 生物膜殖民使中位结温度增加了6.5°C,显著增强了INA.
结论:
- 大气相关的国会议员,特别是当年龄和殖民时,会呈现高INA.
- 微生物修饰是增强MP冰核形成的关键因素.
- 微生物生长的MP代表了一种被低估的影响云微物理的途径.
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