期刊
ATMOSPHERIC CHEMISTRY AND PHYSICS
卷 20, 期 12, 页码 7259-7269出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/acp-20-7259-2020
关键词
-
资金
- National Key R&D Program of China [2018YFC0213105]
- National Science Foundation of China [91644105]
- Natural Science Foundation of Shanghai [18230722600, 19ZR1421100]
- China Postdoctoral Science Foundation [2019M651365]
Ammonia in the atmosphere is essential for the formation of fine particles that impact air quality and climate. Despite extensive prior research to disentangle the relationship between ammonia and haze pollution, the role of ammonia in haze formation in high ammonia-emitting regions is still not well understood Aiming to better understand secondary inorganic aerosol (sulfate, nitrate, ammonium - SNA) formation mechanisms under high-ammonia conditions, 1-year hourly measurement of water-soluble inorganic species (gas and particle) was conducted at a rural supersite in Shanghai. Exceedingly high levels of agricultural ammonia, constantly around 30 mu g m(-3), were observed. We find that gas-particle partitioning of ammonia (epsilon(NH4+)), as opposed to ammonia concentrations, plays a critical role in SNA formation during the haze period. From an assessment of the effects of various parameters, including temperature (T), aerosol water content (AWC), aerosol pH, and activity coefficient, it seems that AWC plays predominant regulating roles for epsilon(NH4+). We propose a self-amplifying feedback mechanism associated with epsilon(NH4+) for the formation of SNA, which is consistent with diurnal variations in epsilon(NH4+), AWC, and SNA. Our results imply that a reduction in ammonia emissions alone may not reduce SNA effectively, at least at rural agricultural sites in China.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据