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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Key role of organic carbon in the sunlight-enhanced atmospheric aging of soot by O_2
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Key role of organic carbon in the sunlight-enhanced atmospheric aging of soot by O_2

机译：有机碳在阳光下通过O_2增强烟灰的大气老化中的关键作用

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摘要

Soot particles are ubiquitous in the atmosphere and have important climatic and health effects. The aging processes of soot during long-range transport result in variability in its morphology, micro-structure, and hygroscopic and optical properties, subsequently leading to the modification of soot's climatic and health effects. In the present study the aging process of soot by molecular O_2 under simulated sunlight irradiation is investigated. Organic carbon components on the surface of soot are found to play a key role in soot aging and are transformed into oxygen-containing organic species including quinones, ketones, aldehydes, lactones, and anhydrides. These oxygen-containing species may become adsorption centers of water and thus enhance the cloud condensation nuclei and ice nuclei activities of soot. Under irradiation of 25 mW-cm~(-2), the apparent rate constants (k_(1,obs)) for loss or formation of species on soot aged by 20% O_2 were larger by factors of 1.5-3.5 than those on soot aged by 100 ppb O_3. Considering the abundance of O_2 in the troposphere and its higher photoreactivity rate, the photochemical oxidation by O_2 under sunlight irradiation should be a very important aging process for soot.
机译：烟尘颗粒在大气中无处不在，并具有重要的气候和健康影响。烟灰在远距离运输过程中的老化过程会导致其形态，微观结构以及吸湿和光学特性发生变化，从而导致烟灰的气候和健康影响发生变化。在本研究中，研究了在模拟阳光照射下，分子O_2对烟灰的老化过程。发现烟灰表面上的有机碳成分在烟灰老化中起关键作用，并转化为含氧有机物，包括醌，酮，醛，内酯和酸酐。这些含氧物质可能成为水的吸附中心，从而增强烟尘的云凝结核和冰核活性。在25 mW-cm〜（-2）的辐照下，年龄在20％O_2上的烟灰上物种消失或形成的表观速率常数（k_（1，obs））比烟灰上的表观速率常数大1.5-3.5倍。老化100 ppb O_3。考虑到对流层中O_2的丰度及其较高的光反应速率，阳光照射下O_2引起的光化学氧化应该是烟灰的重要老化过程。

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    Chong Han; Yongchun Liu; Jinzhu Ma; Hong He;

  • 作者单位

    Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

    Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

    Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

    Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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