The Labile Nature of Ice Nucleation by Arizona Test Dust

The Labile Nature of Ice Nucleation by Arizona Test Dust
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亚利桑那试验尘埃冰核的不稳定性质

DOI:
10.1021/acsearthspacechem.9b00304
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发表时间:
2020
影响因子:
3.4
通讯作者:
DeMott, Paul J.
DeMott, Paul J.
中科院分区:
化学3区
文献类型:
--
作者:
Perkins, Russell J.;Gillette, Samantha M.;Hill, Thomas C.;DeMott, Paul J.

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沙尘气溶胶因其冰核能力而成为重要的大气成分,影响云相和降水。亚利桑那试验粉尘 (ATD) 在实验室研究中经常被用作环境粉尘气溶胶的替代指标。在这项工作中,我们研究了 ATD 的冰成核行为如何随着不同溶液相和多种条件下的干老化过程而改变。我们发现 ATD 冰成核能力在大多数条件下都会显着降低,包括在去离子水或 NaCl 溶液中老化不到一天。其他研究还详细介绍了酸性溶液、盐溶液、过氧化物处理、热处理和蛋白酶处理。我们发现了高温冰成核颗粒的证据,这些颗粒具有有机冰成核剂的分析特征属性,但其热稳定性超出了有机材料的正常范围。我们假设这是由于矿物表面有机材料的结合和稳定。
Dust aerosol is an important atmospheric component due to its ice nucleating ability, which affects cloud phase and precipitation. Arizona Test Dust (ATD) is often used as a proxy for environmental dust aerosol in laboratory studies. In this work, we examine how the ice nucleating behavior of ATD is altered with different solution phase and dry aging processes under several conditions. We find that ATD ice nucleating ability is degraded in significant ways under most conditions, including aging for less than a day in deionized water or NaCl solution. Additional studies are detailed for processing in acidic solutions, salt solutions, peroxide treatment, heat treatment, and protease enzyme treatment. We find evidence of warm-temperature ice nucleating particles that share the analytically characteristic attributes of organic ice nucleators but are heat stable beyond the normal range for organic materials. We hypothesize that this is due to binding and stabilization of organic materials at the mineral surface.
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