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The Labile Nature of Ice Nucleation by Arizona Test Dust
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2020-01-06 , DOI: 10.1021/acsearthspacechem.9b00304 Russell J. Perkins 1 , Samantha M. Gillette 2 , Thomas C. J. Hill 1 , Paul J. DeMott 1
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2020-01-06 , DOI: 10.1021/acsearthspacechem.9b00304 Russell J. Perkins 1 , Samantha M. Gillette 2 , Thomas C. J. Hill 1 , Paul J. DeMott 1
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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.
中文翻译：
亚利桑那试验粉尘对冰核形成的不稳定性质
沙尘气溶胶由于其成冰能力而成为重要的大气成分，影响冰期和降水。亚利桑那试验粉尘（ATD）通常在实验室研究中用作环境粉尘气溶胶的替代物。在这项工作中，我们研究了在几种条件下，ATD的冰成核行为如何随固溶相和干法老化过程而改变。我们发现，在大多数情况下，包括在去离子水或NaCl溶液中老化不到一天，ATD的冰成核能力都会大大降低。有关在酸性溶液，盐溶液，过氧化物处理，热处理和蛋白酶处理中进行处理的其他研究也进行了详细说明。我们发现有证据表明，温暖温度下的冰核颗粒具有有机冰核子的分析特征，但它们的热稳定性超出有机材料的正常范围。我们假设这是由于有机材料在矿物表面的结合和稳定。
更新日期：2020-01-07
中文翻译：
亚利桑那试验粉尘对冰核形成的不稳定性质
沙尘气溶胶由于其成冰能力而成为重要的大气成分，影响冰期和降水。亚利桑那试验粉尘（ATD）通常在实验室研究中用作环境粉尘气溶胶的替代物。在这项工作中，我们研究了在几种条件下，ATD的冰成核行为如何随固溶相和干法老化过程而改变。我们发现，在大多数情况下，包括在去离子水或NaCl溶液中老化不到一天，ATD的冰成核能力都会大大降低。有关在酸性溶液，盐溶液，过氧化物处理，热处理和蛋白酶处理中进行处理的其他研究也进行了详细说明。我们发现有证据表明，温暖温度下的冰核颗粒具有有机冰核子的分析特征，但它们的热稳定性超出有机材料的正常范围。我们假设这是由于有机材料在矿物表面的结合和稳定。
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