Temperature-Dependent Composition of Summertime PM2.5 in Observations and Model Predictions across the Eastern U.S. DOI
Pietro F. Vannucci, Kristen M. Foley, Benjamin N. Murphy

et al.

ACS Earth and Space Chemistry, Journal Year: 2024, Volume and Issue: 8(2), P. 381 - 392

Published: Feb. 5, 2024

Throughout the U.S., summertime fine particulate matter (PM2.5) exhibits a strong temperature (T) dependence. Reducing PM2.5 enhancement with T could reduce public health burden of now and in warmer future. Atmospheric models are critical tool for probing processes components driving observed behaviors. In this work, we describe how modeled aerosol abundance composition vary present-day Eastern specific attention to two major components: sulfate (SO42–) organic carbon (OC). Observations U.S. show an average measured PM2.5-T sensitivity 0.67 μg/m3/K, CMAQv5.4 regional model predictions closely matching value. Observed SO42– OC also increase T; however, has component-specific discrepancies observations. Specifically, underestimates concentrations their while overestimating T. Here, explore series interventions aimed at correcting these deviations. We conclude that relationship is driven by inorganic systems highly coupled, it possible design simultaneously address biases component as well responses

Language: Английский

Secondary Formation of Submicron and Supermicron Organic and Inorganic Aerosols in a Highly Polluted Urban Area DOI
Yan Zheng, Ruqian Miao, Qi Zhang

et al.

Journal of Geophysical Research Atmospheres, Journal Year: 2023, Volume and Issue: 128(4)

Published: Feb. 16, 2023

Abstract Different adverse health effects of submicron (PM 1 ) and fine particles 2.5 may be attributed to their chemical differences, requiring a better understanding size‐resolved composition. Herein, extensive online measurements were conducted across seasons in Beijing by two aerosol mass spectrometers, one which alternately sampled PM . Source apportionment organic (OA) indicated that traffic‐ cooking‐related OA together accounted for ∼20%−30% the , showing insignificant seasonal variations. Coal‐combustion biomass‐burning‐related had minor contributions. The secondary (SOA) factors 59%−73% distributions particulate components varied greatly seasons. Secondary formation played key role particle size growth during cold During severe hazes with high liquid water content (ALWC), supermicron fraction (MF 1−2.5 reached ∼40%−50% while those primary remained at ∼20%. Heterogeneous uptake, aqueous processing, dissolution likely all contributed enhanced concentration components, former perhaps more important. increase MF increasing ALWC spring was less than winter, possibly due shorter duration stagnant conditions limiting formation. Early autumn showed higher values changes as varied, plausibly explained intensive new hindering persistent growth. Our results highlight importance heterogeneous uptake processing distributing SOA mode polluted areas.

Language: Английский

Citations

22
Primary Sulfate Is the Dominant Source of Particulate Sulfate during Winter in Fairbanks, Alaska DOI Creative Commons
Allison Moon, Ursula A. Jongebloed, Kayane K. Dingilian

et al.

ACS ES&T Air, Journal Year: 2023, Volume and Issue: 1(3), P. 139 - 149

Published: Nov. 29, 2023

Within and surrounding high-latitude cities, poor air quality disturbs Arctic ecosystems, influences the climate, harms human health. The Fairbanks North Star Borough has wintertime particulate matter (PM) concentrations that exceed Environmental Protection Agency's (EPA) threshold for public Particulate sulfate (SO

Language: Английский

Citations

20
Sulfate formation via aerosol-phase SO2 oxidation by model biomass burning photosensitizers: 3,4-dimethoxybenzaldehyde, vanillin and syringaldehyde using single-particle mixing-state analysis DOI Creative Commons
Liyuan Zhou, Zhancong Liang,

Brix Raphael Go

et al.

Atmospheric chemistry and physics, Journal Year: 2023, Volume and Issue: 23(9), P. 5251 - 5261

Published: May 10, 2023

Abstract. Atmospheric oxidation of sulfur dioxide (SO2) to sulfate has been widely investigated by means gas-phase and in-cloud chemistry studies. Recent field measurements have shown significant formation in cloud-free environments with high aerosol loadings. As an important fraction biomass burning components, particulate phenolic non-phenolic aromatic carbonyls may initiate photosensitized multiphase SO2 aerosols, which our knowledge however is still its nascent stage. In this study, on the basis single-particle mass spectrometry (SPAMS) measurements, we find evident biomass-burning-derived photosensitizer particles under UV exposure, attributable S(IV), while almost no was observed dark conditions. The efficiency production irradiation, represented number percentage sulfate-containing (99 %–43 %) relative peak area (RPA) (0.67–0.12) spectra, descending order, were 3,4-dimethoxybenzaldehyde (DMB), vanillin (VL) syringaldehyde (SyrAld). Internal mixtures VL potassium nitrate (KNO3) gave a slightly lower RPA than alone. externally mixed KNO3 particles, predominantly formed former, confirming that via photosensitization prevails over photolysis. Our results suggest S(IV) could make contribution formation, especially areas influenced burning.

Language: Английский

Citations

19
Aerosol high water contents favor sulfate and secondary organic aerosol formation from fossil fuel combustion emissions DOI Creative Commons
Huang Xiao-juan, Zhe Liu,

Yanzhen Ge

et al.

npj Climate and Atmospheric Science, Journal Year: 2023, Volume and Issue: 6(1)

Published: Oct. 27, 2023

Abstract Fine-particle pollution associated with high sulfate and secondary organic aerosol (SOA) contents still occurs in winter, despite considerable reductions precursor emissions China. The chemical mechanisms involved are consistently acknowledged to be linked water but remain poorly understood. Here, we present findings demonstrating that the synergistic effect of elevated content particles originating from fossil fuel combustion significantly enhanced rapid formation SOAs under humidity conditions during winter northern presence promoted aging process containing elemental carbon (EC) facilitated SOAs. Evidence single reveals an increased potential for SOA primary aerosols (POAs) combustion, increasing water. Under relative exceeding 85%, multiphase oxidation SO 2 by in-particle nitrite/nitrous acid, generated through reactions involving aged EC-containing iron-rich particles, as well aqueous-phase hydroxymethanesulfonate (HMS), led a substantial increase production. This study emphasizes critical role chemistry concerning SOAs, highlighting urgent necessity mitigate combustion.

Language: Английский

Citations

17
Temperature-Dependent Composition of Summertime PM2.5 in Observations and Model Predictions across the Eastern U.S. DOI
Pietro F. Vannucci, Kristen M. Foley, Benjamin N. Murphy

et al.

ACS Earth and Space Chemistry, Journal Year: 2024, Volume and Issue: 8(2), P. 381 - 392

Published: Feb. 5, 2024

Throughout the U.S., summertime fine particulate matter (PM2.5) exhibits a strong temperature (T) dependence. Reducing PM2.5 enhancement with T could reduce public health burden of now and in warmer future. Atmospheric models are critical tool for probing processes components driving observed behaviors. In this work, we describe how modeled aerosol abundance composition vary present-day Eastern specific attention to two major components: sulfate (SO42–) organic carbon (OC). Observations U.S. show an average measured PM2.5-T sensitivity 0.67 μg/m3/K, CMAQv5.4 regional model predictions closely matching value. Observed SO42– OC also increase T; however, has component-specific discrepancies observations. Specifically, underestimates concentrations their while overestimating T. Here, explore series interventions aimed at correcting these deviations. We conclude that relationship is driven by inorganic systems highly coupled, it possible design simultaneously address biases component as well responses

Language: Английский

Citations

8