Comment on egusphere-2023-2204 DOI Creative Commons

Xiangxinyue Meng,

Zhijun Wu, Jingchuan Chen

et al.

Published: Dec. 25, 2023

Abstract. The particle-phase state is crucial for reactive gas uptake, heterogeneous, and multiphase chemical reactions, thereby impacting secondary aerosol formation. This study provides valuable insights into the significance of transition liquid water (ALW) in winter particulate growth. Our findings reveal that particles predominantly exist as semi-solid or solid during clean days with ambient relative humidity (RH) below 30 %. However, non-liquid to phase occurs when ALW mass fraction exceeds 15 % (dry mass) at RH thresholds 40–60 During haze episodes, transformation rates sulfate nitrate aerosols rapidly increase through increased by 48 11 %, respectively, resulting noticeable increases inorganic (SIA). presence abundant ALW, favored elevated higher proportion SIA, facilitates heterogeneous aqueous processes particles, leading a substantial formation organic oxidation. Consequently, overall hygroscopicity parameters exhibit enhancement mean value 23 These results highlight key factor initiating positive feedback loops between episodes over North China Plain. Accurate predictions necessitate explicit consideration transport models.

Language: Английский

Impact of biomass burning on PM2.5 and organic aerosol: Quantitative estimates and spatial distributions in four Northeast Asian sites DOI
Jayant Nirmalkar, Ji Yi Lee,

Kwangyul Lee

et al.

Atmospheric Environment, Journal Year: 2024, Volume and Issue: 333, P. 120635 - 120635

Published: June 5, 2024

Language: Английский

Citations

1
Hygroscopic growth and activation changed submicron aerosol composition and properties in the North China Plain DOI Creative Commons

Weiqi Xu,

Ye Kuang, Wanyun Xu

et al.

Atmospheric chemistry and physics, Journal Year: 2024, Volume and Issue: 24(16), P. 9387 - 9399

Published: Aug. 28, 2024

Abstract. Aerosol hygroscopic growth and activation under high-relative-humidity (RH) conditions significantly influence the physicochemical properties of submicron aerosols (PM1). However, this process remains poorly characterized due to limited measurements. To address gap, we deployed an advanced aerosol–fog sampling system that automatically switched between PM1, PM2.5 total suspended particulate (TSP) inlets at a rural site in North China Plain cold season. The results revealed aerosol swelling water vapor uptake influenced high-RH by shifting cut-off size impactors. At subsaturated high RH (> 90 %), over 25 % mass with dry diameters below 1 µm resided supermicron ranges, while supersaturated foggy conditions, more than 70 migrated ranges. Hygroscopic particularly affected highly hydrophilic inorganic salts, significant number sulfate nitrate particles 27 %–33 95 ≤ 99 78 conditions. Moreover, 10 biomass burning organic grew beyond 2.5 during fog events, fossil-fuel-related (FFOA) remained dominantly suggesting inefficient aqueous conversion FFOA. two secondary (SOA) factors (OOA1 OOA2) behaved differently OOA2 exhibiting higher activated fraction despite lower oxygen / carbon ratio. A substantial increase organosulfur concentrations droplets events suggested conversions formations brown potential radiative impacts. Overall, our study highlights remarkably different cloud processing behaviors primary aerosols, which would benefit better understanding aerosol–cloud interactions distinct atmospheric

Language: Английский

Citations

1
Comment on egusphere-2024-998 DOI Creative Commons

Weiqi Xu,

Ye Kuang, Wanyun Xu

et al.

Published: May 9, 2024

Abstract. Aerosol hygroscopic growth and activation under high relative humidity (RH) conditions significantly influence the physicochemical properties of submicron aerosols (PM1). However, this process remains poorly characterized due to limited measurements. To address gap, we deployed an advanced aerosol-fog sampling system that automatically switched between PM1, PM2.5, TSP inlets at a rural site in North China Plain cold season. The results revealed aerosol swelling water vapor uptake influenced RH by shifting cut-off size impactors. Under subsaturated (> 90 %), over 25 % mass with dry diameters below 1 μm resided supermicron ranges, while supersaturated foggy conditions, more than 70 migrated ranges. Hygroscopic particularly affected highly hydrophilic inorganic salts significant sulfate nitrate particles 27 – 33 95 ≤ 99 %, 65.5 conditions. Moreover, 10 biomass burning organic grew beyond 2.5 during fog events, fossil fuel-related OA (FFOA) remained dominantly suggesting inefficient aqueous conversion FFOA. two SOA factors (OOA1 OOA2) behaved differently OOA2 exhibiting higher activated fraction despite lower oxygen-to-carbon ratio. A substantial increase organosulfur concentrations droplets events suggested conversions formations brown carbon potential radiative impacts. Overall, our study highlights remarkably different processing primary secondary PM1 components distinct ambient

Language: Английский

Citations

0
Comment on egusphere-2024-998 DOI Creative Commons

Weiqi Xu,

Ye Kuang, Wanyun Xu

et al.

Published: May 21, 2024

Abstract. Aerosol hygroscopic growth and activation under high relative humidity (RH) conditions significantly influence the physicochemical properties of submicron aerosols (PM1). However, this process remains poorly characterized due to limited measurements. To address gap, we deployed an advanced aerosol-fog sampling system that automatically switched between PM1, PM2.5, TSP inlets at a rural site in North China Plain cold season. The results revealed aerosol swelling water vapor uptake influenced RH by shifting cut-off size impactors. Under subsaturated (> 90 %), over 25 % mass with dry diameters below 1 μm resided supermicron ranges, while supersaturated foggy conditions, more than 70 migrated ranges. Hygroscopic particularly affected highly hydrophilic inorganic salts significant sulfate nitrate particles 27 – 33 95 ≤ 99 %, 65.5 conditions. Moreover, 10 biomass burning organic grew beyond 2.5 during fog events, fossil fuel-related OA (FFOA) remained dominantly suggesting inefficient aqueous conversion FFOA. two SOA factors (OOA1 OOA2) behaved differently OOA2 exhibiting higher activated fraction despite lower oxygen-to-carbon ratio. A substantial increase organosulfur concentrations droplets events suggested conversions formations brown carbon potential radiative impacts. Overall, our study highlights remarkably different processing primary secondary PM1 components distinct ambient

Language: Английский

Citations

0
Impact of sea ice on the physicochemical characteristics of marine aerosols in the Arctic Ocean DOI
Shanshan Wang,

Liping Jiao,

Jinpei Yan

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 949, P. 175135 - 175135

Published: July 30, 2024

Language: Английский

Citations

0
Substantial contribution of transported emissions to organic aerosol in Beijing DOI Creative Commons

Kaspar R. Daellenbach,

Jing Cai, Simo Hakala

et al.

Nature Geoscience, Journal Year: 2024, Volume and Issue: 17(8), P. 747 - 754

Published: Aug. 1, 2024

Haze in Beijing is linked to atmospherically formed secondary organic aerosol, which has been shown be particularly harmful human health. However, the sources and formation pathways of these aerosols remain largely unknown, hindering effective pollution mitigation. Here we have quantified aerosol via direct near-molecular observations central Beijing. In winter, arises mainly from fresh solid-fuel emissions originating both combustion aqueous processes, probably involving multiphase chemistry with aromatic compounds. The most severe haze combustion, transported Beijing-Tianjing-Hebei Plain rural mountainous areas west summer, increased fraction dominated by Xi'an-Shanghai-Beijing region, while contribution biogenic remains relatively small. Overall, identify main affecting Beijing, clearly extend beyond local Our results suggest that targeting key precursor emission sectors regionally may needed effectively mitigate pollution.

Language: Английский

Citations

0
Unequal toxic effects of size-segregated single particles emitted from typical industrial plants, vehicles, and road dust DOI
Qi Zhang,

Shuibing Wang,

Chen Xiu

et al.

Journal of Hazardous Materials, Journal Year: 2024, Volume and Issue: 480, P. 136419 - 136419

Published: Nov. 5, 2024

Language: Английский

Citations

0
Reply on RC2 DOI Creative Commons
Zhijun Wu

Published: Jan. 15, 2024

Abstract. The particle-phase state is crucial for reactive gas uptake, heterogeneous, and multiphase chemical reactions, thereby impacting secondary aerosol formation. This study provides valuable insights into the significance of transition liquid water (ALW) in winter particulate growth. Our findings reveal that particles predominantly exist as semi-solid or solid during clean days with ambient relative humidity (RH) below 30 %. However, non-liquid to phase occurs when ALW mass fraction exceeds 15 % (dry mass) at RH thresholds 40–60 During haze episodes, transformation rates sulfate nitrate aerosols rapidly increase through increased by 48 11 %, respectively, resulting noticeable increases inorganic (SIA). presence abundant ALW, favored elevated higher proportion SIA, facilitates heterogeneous aqueous processes particles, leading a substantial formation organic oxidation. Consequently, overall hygroscopicity parameters exhibit enhancement mean value 23 These results highlight key factor initiating positive feedback loops between episodes over North China Plain. Accurate predictions necessitate explicit consideration transport models.

Language: Английский

Citations

0
Reply on RC1 DOI Creative Commons
Zhijun Wu

Published: Jan. 15, 2024

Abstract. The particle-phase state is crucial for reactive gas uptake, heterogeneous, and multiphase chemical reactions, thereby impacting secondary aerosol formation. This study provides valuable insights into the significance of transition liquid water (ALW) in winter particulate growth. Our findings reveal that particles predominantly exist as semi-solid or solid during clean days with ambient relative humidity (RH) below 30 %. However, non-liquid to phase occurs when ALW mass fraction exceeds 15 % (dry mass) at RH thresholds 40–60 During haze episodes, transformation rates sulfate nitrate aerosols rapidly increase through increased by 48 11 %, respectively, resulting noticeable increases inorganic (SIA). presence abundant ALW, favored elevated higher proportion SIA, facilitates heterogeneous aqueous processes particles, leading a substantial formation organic oxidation. Consequently, overall hygroscopicity parameters exhibit enhancement mean value 23 These results highlight key factor initiating positive feedback loops between episodes over North China Plain. Accurate predictions necessitate explicit consideration transport models.

Language: Английский

Citations

0
Particle Phase State and Aerosol Liquid Water Greatly Impact Secondary Aerosol Formation: Insights into Phase Transition and Role in Haze Events DOI Creative Commons

Xiangxinyue Meng,

Zhijun Wu, Jingchuan Chen

et al.

Published: Nov. 2, 2023

Abstract. The particle-phase state is crucial for reactive gas uptake, heterogeneous, and multiphase chemical reactions, thereby impacting secondary aerosol formation. This study provides valuable insights into the significance of transition liquid water (ALW) in winter particulate growth. Our findings reveal that particles predominantly exist as semi-solid or solid during clean days with ambient relative humidity (RH) below 30 %. However, non-liquid to phase occurs when ALW mass fraction exceeds 15 % (dry mass) at RH thresholds 40–60 During haze episodes, transformation rates sulfate nitrate aerosols rapidly increase through increased by 48 11 %, respectively, resulting noticeable increases inorganic (SIA). presence abundant ALW, favored elevated higher proportion SIA, facilitates heterogeneous aqueous processes particles, leading a substantial formation organic oxidation. Consequently, overall hygroscopicity parameters exhibit enhancement mean value 23 These results highlight key factor initiating positive feedback loops between episodes over North China Plain. Accurate predictions necessitate explicit consideration transport models.

Language: Английский

Citations

0