Atmospheric Humic-Like Substances (HULIS) Act as Ice Active Entities
Atmospheric Humic-Like Substances (HULIS) Act as Ice Active Entities
复制标题
大气腐殖质类物质 (HULIS) 作为冰活性实体
DOI：
10.1029/2021gl092443
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发表时间：
2021-07-28
影响因子：
5.2
通讯作者：
Li, S. M.
中科院分区：
文献类型：
--
作者：
Chen, J.;Wu, Z. J.;Li, S. M.
研究了腐植酸样物质（HULIS）的冰核活性。HULIS是有机气溶胶（OA）的重要组成部分，来源于大气和生物质燃烧气溶胶，并由水相化学反应产生。在混合相云条件下，各自的HULIS可以有效触发异构IN。HULIS冰活性实体（IAE）是大小在0.02 ~ 0.10 μ m之间的聚集体。在-20℃时，每单位HULIS质量的IAE数量在213 ~ 8.7 × 10(4) mg（-1）之间变化。这些结果与以往研究中在水生腐殖质（HS）中检测到的结果不同，这意味着使用HS作为替代品可能无法可靠地估计真实大气中IAE的浓度。将大气中HULIS的丰度与目前的结果结合起来，表明HULIS可能是大气中其他冰核粒子物种（如尘埃和生物粒子）浓度低或不存在的重要IAE贡献者。
We investigated the ice nucleation activities of humic-like substances (HULIS), an important component of organic aerosol (OA), derived from atmospheric and biomass burning aerosols, and produced from aqueous-phase chemical reactions. Respective HULIS can effectively trigger heterogeneous IN under mixed-phase cloud conditions. HULIS ice active entities (IAE) were aggregates in size between 0.02 and 0.10 mu m. At -20 degrees C, the IAE numbers per unit HULIS mass varied from 213 to 8.7 x 10(4) mg(-1). Such results were different than those detected in aquatic humic substances (HS) from previous studies, implying using HS as surrogates may not robustly estimate the IAE concentrations in the real atmosphere. Combining the abundance of atmospheric HULIS with the present results suggests that HULIS could be an important IAE contributor in the atmosphere where other ice nucleating particle species, such as dust and biological particles, are either low in concentration or absent.