The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 909, P. 168582 - 168582
Published: Nov. 14, 2023
Language: Английский
Nature Geoscience, Journal Year: 2023, Volume and Issue: 17(1), P. 20 - 25
Published: Nov. 27, 2023
Language: Английский
Citations
36
Environmental Science Atmospheres, Journal Year: 2023, Volume and Issue: 3(3), P. 506 - 520
Published: Jan. 1, 2023
Negligible losses were observed for many atmospheric trace species after traversing the PFA Teflon tubing that was hundreds of meters in length.
Language: Английский
Citations
24
The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 919, P. 170836 - 170836
Published: Feb. 10, 2024
Language: Английский
Citations
11
Atmospheric chemistry and physics, Journal Year: 2023, Volume and Issue: 23(16), P. 9455 - 9471
Published: Aug. 25, 2023
Abstract. Fine particulate matter (PM2.5) pollution is still one of China's most important environmental issues, especially in northern cities during wintertime. In this study, intensive real-time measurement campaigns were conducted Xi'an, Shijiazhuang, and Beijing to investigate the chemical characteristics source contributions PM2.5 explore formation heavy for policy implications. The compositions three all dominated by organic aerosol (OA) nitrate (NO3-). Results apportionment analyzed a hybrid receptor model (HERM) showed that secondary contributed more compared other primary sources. Biomass burning was dominant pilot cities. contribution coal combustion non-negligible Xi'an Shijiazhuang but no longer an contributor capital city due execution strict coal-banning policy. potential mechanisms further explored establishing correlations between sources liquid water content (ALWC) Ox (O3+NO2), respectively. results photochemical oxidation aqueous-phase reaction two pathways formation. According variations, air events occurred classified into types: biomass-combustion-dominated, secondary-formation-source-dominated, combination Additionally, study compares changes composition past decades. suggest clean-energy replacements rural households should be urgently encouraged reduce emissions China, collaborative control on ozone needs continuously promoted weaken atmosphere capacity sake reducing
Language: Английский
Citations
21
The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 932, P. 173011 - 173011
Published: May 7, 2024
Language: Английский
Citations
6
Atmospheric chemistry and physics, Journal Year: 2023, Volume and Issue: 23(1), P. 611 - 636
Published: Jan. 16, 2023
Abstract. To investigate the impact of aging on sources, volatility, and viscosity organic aerosol (OA) in Chinese outflows, a high-resolution time-of-flight mass spectrometer (HR-AMS) coupled with thermodenuder (TD) was deployed spring 2018 Dongying, which is regional receptor site metropolitan emissions North China Plain (NCP). The average concentration PM1 31.5±22.7 µg m−3, mainly composed nitrate (33 %) OA (25 %). source apportionment results show that contributed by oxygenated (OOA) from secondary including background-OOA representing background (2.6 m−3) NCP area, transported-OOA oxidized urban emissions. other two factors include aged hydrocarbon-liked (aged-HOA, 28 transported vehicle biomass burning (BBOA, 5 local open burning. volatility total (average C*=3.2×10-4 this study generally lower than reported previous field studies, due to high oxidation level resulting processes during transport. volatilities follow order C*=2.7×10-5 < (3.7×10-4µgm-3)< aged-HOA (8.1×10-4µgm-3)< BBOA (0.012 m−3). Extremely low ambient air indicate oligomers may exist plumes. estimation suggests majority behaves as semisolid (60 %), liquifies at higher relative humidity (RH) (21 solidifies (19 noon when RH high. Finally, estimated mixing time molecules 200 nm varies dramatically minutes night years afternoon, emphasizing need consider its dynamic kinetic limits modeling OA. In general, overall improve our understanding viscosity.
Language: Английский
Citations
16
Atmospheric chemistry and physics, Journal Year: 2023, Volume and Issue: 23(20), P. 13107 - 13124
Published: Oct. 18, 2023
Abstract. Nighttime ozone in the lower boundary layer regulates atmospheric chemistry and surface air quality, but our understanding of its vertical structure impact is largely limited by extreme sparsity direct measurements. Here we present 3-year (2017–2019) measurements (up to 500 m) from Canton Tower Guangzhou, core megacity South China, interpret with a 1-month high-resolution chemical simulation Community Multiscale Air Quality (CMAQ) model. Measurements are available at 10, 118, 168, 488 m, highest (488 measurement platform higher than typical height nighttime stable that allows residual (RL). We find increases altitude throughout day, gradient between 10 m heights (ΔO3/ΔH10–488 3.6–6.4 ppbv hm−1 4.4–5.8 daytime. identify high ratio, defined as ratio concentration averaged over afternoon (14:00–17:00 LT), 69 %–90 % January, April, October, remarkably other three layers (29 %–51 %). Ozone convective mixing provides source RL, strong temperature inversion facilitates ability RL store daytime layer. The tower-based also indicates Ox (Ox= O3+NO2) level can be an effective indicator if not available. further significant influences nocturnal on both following day's quality. During enhancement (NOE) event, observe decrease increase NO2 CO height, contrast their changes surface, feature enhanced mixing. leads NOE event introducing ozone-rich NOx-poor into enter CMAQ model simulations demonstrate positive contribution diffusion (ΔVDIF) 118 negative 168 during event. correlation maximum daily 8 h average (MDA8) ozone. This tied collapse development layer, which supported diagnosis budget, suggesting downward via entrainment important mechanism for aggravating pollution day. bias CMAQ-simulated MDA8 day shows coefficient (r= 0.74) highlighting necessity correct quality accurate prediction Our study thus highlights value long-term coupling dynamics.
Language: Английский
Citations
16
Environment International, Journal Year: 2023, Volume and Issue: 183, P. 108361 - 108361
Published: Nov. 30, 2023
Due to the implementation of air pollution control measures in China, quality has significantly improved, although there are still additional issues be addressed. This study used long-term trends pollutants discuss achievements and challenges further improving China. The Kolmogorov-Zurbenko (KZ) filter multiple-linear regression (MLR) were quantify meteorology-related emission-related from 2014 2022 KZ analysis showed that PM2.5 decreased by 7.36 ± 2.92 % yr−1, while daily maximum 8-h ozone (MDA8 O3) an increasing trend with 3.71 2.89 yr−1 decrease increase MDA8 O3 primarily attributed changes emission, relative contribution 85.8% 86.0%, respectively. Meteorology variations, including increased ambient temperature, boundary layer height, reduced humidity, also contributed reduction enhancement O3. exhibited continuous increase, respectively, 2022, variation rates slowed during 2018-2020 compared 2014-2017, highlighting quality, particularly simultaneously reducing recommends NH3 emissions agriculture sector rural areas transport urban levels. Addressing requires precursor gases based on site-specific atmospheric chemistry considerations.
Language: Английский
Citations
16
The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 914, P. 169778 - 169778
Published: Jan. 3, 2024
Language: Английский
Citations
5
Atmospheric Environment, Journal Year: 2023, Volume and Issue: 301, P. 119702 - 119702
Published: March 10, 2023
Language: Английский
Citations
12