Key Role of Nitrate in Phase Transitions of Urban Particles: Implications of Important Reactive Surfaces for Secondary Aerosol Formation

Research output: Contribution to journalArticlepeer-review

Standard

Key Role of Nitrate in Phase Transitions of Urban Particles: Implications of Important Reactive Surfaces for Secondary Aerosol Formation. / Sun, Jiaxing; Liu, Lei; Xu, Liang; Wang, Yuanyuan; Wu, Zhijun; Hu, Min; Shi, Zongbo; Li, Yongjie; Zhang, Xiaoye; Chen, Jianmin; Li, Weijun.

In: Journal of Geophysical Research: Atmospheres, 20.02.2018, p. 1234-1243.

Research output: Contribution to journalArticlepeer-review

Harvard

APA

Vancouver

Author

Sun, Jiaxing ; Liu, Lei ; Xu, Liang ; Wang, Yuanyuan ; Wu, Zhijun ; Hu, Min ; Shi, Zongbo ; Li, Yongjie ; Zhang, Xiaoye ; Chen, Jianmin ; Li, Weijun. / Key Role of Nitrate in Phase Transitions of Urban Particles: Implications of Important Reactive Surfaces for Secondary Aerosol Formation. In: Journal of Geophysical Research: Atmospheres. 2018 ; pp. 1234-1243.

Bibtex

@article{68ec9394d1c2468382d8447e87b19999,
title = "Key Role of Nitrate in Phase Transitions of Urban Particles:: Implications of Important Reactive Surfaces for Secondary Aerosol Formation",
abstract = "Ammonium sulfate (AS) and ammonium nitrate (AN) are key components of urban fine particles. Both field and model studies showed that heterogeneous reactions of SO2, NO2, and NH3 on wet aerosols accelerated the haze formation in northern China. However, little is known on phase transitions of AS-AN containing haze particles. Here hygroscopic properties of laboratory-generated AS-AN particles and individual particles collected during haze events in an urban site were investigated using an individual particle hygroscopicity system. AS-AN particles showed a two-stage deliquescence at mutual deliquescence relative humidity (MDRH) and full deliquescence relative humidity (DRH) and three physical states: solid before MDRH, solid-aqueous between MDRH and DRH, and aqueous after DRH. During hydration, urban haze particles displayed a solid core and aqueous shell at RH = 60-80% and aqueous phase at RH > 80%. Most particles were in aqueous phase at RH > 50% during dehydration. Our results show that AS content in individual particles determines their DRH and AN content determines their MDRH. AN content increase can reduce MDRH, which indicates occurrence of aqueous shell at lower RH. The humidity-dependent phase transitions of nitrate-abundant urban particles are important to provide reactive surfaces of secondary aerosol formation in the polluted air.",
keywords = "Deliquescence relative humidity, Haze formation, Heterogeneous reaction, Hygroscopicity, Individual particles",
author = "Jiaxing Sun and Lei Liu and Liang Xu and Yuanyuan Wang and Zhijun Wu and Min Hu and Zongbo Shi and Yongjie Li and Xiaoye Zhang and Jianmin Chen and Weijun Li",
year = "2018",
month = feb,
day = "20",
doi = "10.1002/2017JD027264",
language = "English",
pages = "1234--1243",
journal = "Journal of Geophysical Research: Atmospheres",
issn = "2169-897X",
publisher = "American Geophysical Union",

}

RIS

TY - JOUR

T1 - Key Role of Nitrate in Phase Transitions of Urban Particles:

T2 - Implications of Important Reactive Surfaces for Secondary Aerosol Formation

AU - Sun, Jiaxing

AU - Liu, Lei

AU - Xu, Liang

AU - Wang, Yuanyuan

AU - Wu, Zhijun

AU - Hu, Min

AU - Shi, Zongbo

AU - Li, Yongjie

AU - Zhang, Xiaoye

AU - Chen, Jianmin

AU - Li, Weijun

PY - 2018/2/20

Y1 - 2018/2/20

N2 - Ammonium sulfate (AS) and ammonium nitrate (AN) are key components of urban fine particles. Both field and model studies showed that heterogeneous reactions of SO2, NO2, and NH3 on wet aerosols accelerated the haze formation in northern China. However, little is known on phase transitions of AS-AN containing haze particles. Here hygroscopic properties of laboratory-generated AS-AN particles and individual particles collected during haze events in an urban site were investigated using an individual particle hygroscopicity system. AS-AN particles showed a two-stage deliquescence at mutual deliquescence relative humidity (MDRH) and full deliquescence relative humidity (DRH) and three physical states: solid before MDRH, solid-aqueous between MDRH and DRH, and aqueous after DRH. During hydration, urban haze particles displayed a solid core and aqueous shell at RH = 60-80% and aqueous phase at RH > 80%. Most particles were in aqueous phase at RH > 50% during dehydration. Our results show that AS content in individual particles determines their DRH and AN content determines their MDRH. AN content increase can reduce MDRH, which indicates occurrence of aqueous shell at lower RH. The humidity-dependent phase transitions of nitrate-abundant urban particles are important to provide reactive surfaces of secondary aerosol formation in the polluted air.

AB - Ammonium sulfate (AS) and ammonium nitrate (AN) are key components of urban fine particles. Both field and model studies showed that heterogeneous reactions of SO2, NO2, and NH3 on wet aerosols accelerated the haze formation in northern China. However, little is known on phase transitions of AS-AN containing haze particles. Here hygroscopic properties of laboratory-generated AS-AN particles and individual particles collected during haze events in an urban site were investigated using an individual particle hygroscopicity system. AS-AN particles showed a two-stage deliquescence at mutual deliquescence relative humidity (MDRH) and full deliquescence relative humidity (DRH) and three physical states: solid before MDRH, solid-aqueous between MDRH and DRH, and aqueous after DRH. During hydration, urban haze particles displayed a solid core and aqueous shell at RH = 60-80% and aqueous phase at RH > 80%. Most particles were in aqueous phase at RH > 50% during dehydration. Our results show that AS content in individual particles determines their DRH and AN content determines their MDRH. AN content increase can reduce MDRH, which indicates occurrence of aqueous shell at lower RH. The humidity-dependent phase transitions of nitrate-abundant urban particles are important to provide reactive surfaces of secondary aerosol formation in the polluted air.

KW - Deliquescence relative humidity

KW - Haze formation

KW - Heterogeneous reaction

KW - Hygroscopicity

KW - Individual particles

UR - http://www.scopus.com/inward/record.url?scp=85040863917&partnerID=8YFLogxK

U2 - 10.1002/2017JD027264

DO - 10.1002/2017JD027264

M3 - Article

SP - 1234

EP - 1243

JO - Journal of Geophysical Research: Atmospheres

JF - Journal of Geophysical Research: Atmospheres

SN - 2169-897X

ER -