气候变化领域集成服务门户(CCPortal): Mutual promotion between aerosol particle liquid water and particulate nitrate enhancement leads to severe nitrate-dominated particulate matter pollution and low visibility

CCPortal

DOI	10.5194/acp-20-2161-2020
	Mutual promotion between aerosol particle liquid water and particulate nitrate enhancement leads to severe nitrate-dominated particulate matter pollution and low visibility
	Wang Y.; Chen Y.; Wu Z.; Shang D.; Bian Y.; Du Z.; H. Schmitt S.; Su R.; I. Gkatzelis G.; Schlag P.; Hohaus T.; Voliotis A.; Lu K.; Zeng L.; Zhao C.; Rami Alfarra M.; McFiggans G.; Wiedensohler A.; Kiendler-Scharr A.; Zhang Y.; Hu M.
发表日期	2020
ISSN	16807316
起始页码	2161
结束页码	2175
卷号	20 期号:4
英文摘要	As has been the case in North America and western Europe, the SO2 emissions have substantially reduced in the North China Plain (NCP) in recent years. Differential rates of reduction in SO2 and NOx concentrations result in the frequent occurrence of particulate matter pollution dominated by nitrate ( $p {NO}_{3}^{-}$ ) over the NCP. In this study, we observed a polluted episode with the particulate nitrate mass fraction in nonrefractory PM1 (NR-PM1) being up to 44 % during wintertime in Beijing. Based on this typical $p {NO}_{3}^{-}$ -dominated haze event, the linkage between aerosol water uptake and $p {NO}_{3}^{-}$ enhancement, further impacting on visibility degradation, has been investigated based on field observations and theoretical calculations. During haze development, as ambient relative humidity (RH) increased from ĝ1/410 % to 70 %, the aerosol particle liquid water increased from ĝ1/41 μg m-3 at the beginning to ĝ1/475 μg m-3 in the fully developed haze period. The aerosol liquid water further increased the aerosol surface area and volume, enhancing the condensational loss of N2O5 over particles. From the beginning to the fully developed haze, the condensational loss of N2O5 increased by a factor of 20 when only considering aerosol surface area and volume of dry particles, while increasing by a factor of 25 when considering extra surface area and volume due to water uptake. Furthermore, aerosol liquid water favored the thermodynamic equilibrium of HNO3 in the particle phase under the supersaturated HNO3 and NH3 in the atmosphere. All the above results demonstrated that $p {NO}_{3}^{-}$ is enhanced by aerosol water uptake with elevated ambient RH during haze development, in turn facilitating the aerosol take-up of water due to the hygroscopicity of particulate nitrate salt. Such mutual promotion between aerosol particle liquid water and particulate nitrate enhancement can rapidly degrade air quality and halve visibility within 1 d. Reduction of nitrogen-containing gaseous precursors, e.g., by control of traffic emissions, is essential in mitigating severe haze events in the NCP. © 2020. This work is distributed under the Creative Commons Attribution 4.0 License.
关键词	aerosol atmospheric pollution haze nitrate particulate matter relative humidity severe weather thermodynamics visibility water uptake winter Beijing [China]China North China Plain
语种	英语
来源机构	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132213
推荐引用方式 GB/T 7714	Wang Y.,Chen Y.,Wu Z.,et al. Mutual promotion between aerosol particle liquid water and particulate nitrate enhancement leads to severe nitrate-dominated particulate matter pollution and low visibility[J]. Atmospheric Chemistry and Physics,2020,20(4).
APA	Wang Y..,Chen Y..,Wu Z..,Shang D..,Bian Y..,...&Hu M..(2020).Mutual promotion between aerosol particle liquid water and particulate nitrate enhancement leads to severe nitrate-dominated particulate matter pollution and low visibility.,20(4).
MLA	Wang Y.,et al."Mutual promotion between aerosol particle liquid water and particulate nitrate enhancement leads to severe nitrate-dominated particulate matter pollution and low visibility".20.4(2020).