Comment on acp-2021-683 DOI Creative Commons
Haoran Zhang, Nan Li,

Keqin Tang

и другие.

Опубликована: Дек. 6, 2021

Abstract. PM2.5, generated via both direct emission and secondary formation, can have varying environmental impacts due to different physical chemical properties of its components. However, traditional methods quantify class="inline-formula">2.5 components are often based on online or offline observations numerical models, which generally high economic cost- labor-intensive. In this study, we develop a new method, named Multi-Tracer Estimation Algorithm (MTEA), identify the primary from routine observation class="inline-formula">2.5. By comparing with long-term short-term measurements aerosol in China United States, it is proven that MTEA successfully capture magnitude variation (PPM) (SPM). Applying National Air Quality Network, find (1) SPM accounted for 63.5 % cities southern average during 2014–2018, while proportion dropped 57.1 % north China, at same time regional background regions was ∼ 19 % higher than populous regions; (2) summertime presented slight but consistent increasing trend (from 58.5 % 59.2 %) most cities, mainly because recent increase O3 pollution China; (3) Beijing significantly increased by 34 % COVID-19 lockdown, might be main reason observed unexpected PM special period; finally, (4) showed similar positive correlations Beijing-Tianjin-Hebei (BTH) Yangtze River Delta (YRD) regions, between total these two as determined PPM levels, were quite different. general, promising tool efficiently estimating SPM, has huge potential future mitigation.

Язык: Английский

The impacts of ship emissions on ozone in eastern China DOI

Xinyi Fu,

Dongsheng Chen,

Xiaotong Wang

и другие.

The Science of The Total Environment, Год журнала: 2023, Номер 903, С. 166252 - 166252

Опубликована: Авг. 11, 2023

Язык: Английский

Процитировано

17
Estimation of secondary PM<sub>2.5</sub> in China and the United States using a multi-tracer approach DOI Creative Commons
Haoran Zhang, Nan Li,

Keqin Tang

и другие.

Atmospheric chemistry and physics, Год журнала: 2022, Номер 22(8), С. 5495 - 5514

Опубликована: Апрель 26, 2022

Abstract. PM2.5, generated via both direct emission and secondary formation, can have varying environmental impacts due to different physical chemical properties of its components. However, traditional methods quantify PM2.5 components are often based on online or offline observations numerical models, which generally high economic cost- labor-intensive. In this study, we develop a new method, named Multi-Tracer Estimation Algorithm (MTEA), identify the primary from routine observation PM2.5. By comparing with long-term short-term measurements aerosol in China United States, it is proven that MTEA successfully capture magnitude variation (PPM) (SPM). Applying National Air Quality Network, find (1) SPM accounted for 63.5 % cities southern average during 2014–2018, while proportion dropped 57.1 north China, at same time regional background regions was ∼ 19 higher than populous regions; (2) summertime presented slight but consistent increasing trend (from 58.5 59.2 %) most cities, mainly because recent increase O3 pollution China; (3) Beijing significantly increased by 34 COVID-19 lockdown, might be main reason observed unexpected PM special period; finally, (4) showed similar positive correlations Beijing-Tianjin-Hebei (BTH) Yangtze River Delta (YRD) regions, between total these two as determined PPM levels, were quite different. general, promising tool efficiently estimating SPM, has huge potential future mitigation.

Язык: Английский

Процитировано

18
Observational study of the regional PM2.5–O3 pollution in the Yangtze River Delta region: Vertical distribution, temporal evolution and comparison of different pollution types DOI
Yulin Wang, Honglei Wang, Shuangshuang Shi

и другие.

Atmospheric Environment, Год журнала: 2025, Номер unknown, С. 121072 - 121072

Опубликована: Янв. 1, 2025

Язык: Английский

Процитировано

0
Effects of 2010–2045 climate change on ozone levels in China under a carbon neutrality scenario: key meteorological parameters and processes DOI Creative Commons

Ling Kang,

Hong Liao, Ke Li

и другие.

Atmospheric chemistry and physics, Год журнала: 2025, Номер 25(6), С. 3603 - 3621

Опубликована: Март 26, 2025

Abstract. We examined the effects of 2010–2045 climate change on ozone (O3) levels in China under a carbon neutrality scenario using Global Change and Air Pollution version 2.0 (GCAP 2.0) model. In eastern (EC), GCAP six other models from Coupled Model Intercomparison Project Phase 6 (CMIP6) all projected increases daily maximum 2 m temperature (T2max), surface incoming shortwave radiation (SW), planet boundary layer height decreases relative humidity (RH) sea level pressure. Future is simulated by to have large O3 even pathway, with summertime regional seasonal mean 8 h average (MDA8) concentrations increasing 2.3 ppbv (3.9 %) over EC, 4.7 (7.3 North Plain, 3.0 (5.1 Yangtze River Delta. Changes key meteorological parameters were found explain 58 %–76 % climate-driven MDA8 changes EC. The most important summer are T2max SW northern central EC RH southern Analysis showed net chemical production was process that O3, accounting for 34.0 %–62.5 sum processes within layer. also quantified uncertainties climate-induced CMIP6 multi-model projections stepwise multiple linear regression results at lower end multi-models. These implications policy-making regarding emission controls against background warming.

Язык: Английский

Процитировано

0
Process analysis of the impacts of ship emissions on PM2.5 and O3 in the Yangtze River Delta, China DOI

Xinyi Fu,

Xiaotong Wang,

Dongsheng Chen

и другие.

Journal of Environmental Sciences, Год журнала: 2025, Номер unknown

Опубликована: Май 1, 2025

Язык: Английский

Процитировано

0
Horizontal flux of ozone in the planetary boundary layer in Hong Kong using wind LiDAR measurements DOI
Changqing Lin, Jimmy Chi Hung Fung, Chao Ren

и другие.

Atmospheric Environment, Год журнала: 2023, Номер 312, С. 120046 - 120046

Опубликована: Авг. 19, 2023

Язык: Английский

Процитировано

6
Machine-learning-based corrections of CMIP6 historical surface ozone in China during 1950–2014 DOI

Yuanxi Tong,

Yingying Yan, Jintai Lin

и другие.

Environmental Pollution, Год журнала: 2024, Номер 357, С. 124397 - 124397

Опубликована: Июнь 19, 2024

Язык: Английский

Процитировано

2
Variations in summertime ozone in Nanjing between 2015 and 2020: roles of meteorology, radical chain length and ozone production efficiency DOI
Lin Li, Jingyi Li, Momei Qin

и другие.

Frontiers of Environmental Science & Engineering, Год журнала: 2024, Номер 18(11)

Опубликована: Сен. 6, 2024

Язык: Английский

Процитировано

2
Stratospheric intrusion may aggravate widespread ozone pollution through both vertical and horizontal advections in eastern China during summer DOI Creative Commons
Fengyi Chang, Jiandong Li, Nan Li

и другие.

Frontiers in Environmental Science, Год журнала: 2023, Номер 10

Опубликована: Янв. 16, 2023

Stratospheric intrusion (SI) is an important source of tropospheric ozone (O 3 ). Here, we used the online coupled Weather Research and Forecasting-Chemistry (WRF-Chem) model to simulate a typical SI event that occurred over eastern China on 15–19 July 2016 investigate impacts near-surface O pollution. The results show large-scale circulation was characterized by deep trough central South Asia high Western Pacific Subtropical located east west trough, respectively. With evolution strong downdrafts behind lead -rich air injected into lower troposphere across China. By using tracer tagging method in WRF-Chem, quantified contributed up 6.5 ppb surface concentration. According integrated process rate analyses, which were employed quantify contribution different physical/chemical processes , advection dominated variations with positive ranging from 0.1 13.8 h −1 . As altitude decreases, diminishes as intensity gradually weakens. Although vertical limited directly reached ground, revealed has significant impact large territory through regional transport horizontal process. Below 691 m, ranges 1.6 13.4 This study highlights natural effect summertime pollution will help development future alert system.

Язык: Английский

Процитировано

5
Ozone Pollution and Its Response to Nitrogen Dioxide Change from a Dense Ground-Based Network in the Yangtze River Delta: Implications for Ozone Abatement in Urban Agglomeration DOI Creative Commons
Zhonghua He, Yue He, Gaofeng Fan

и другие.

Atmosphere, Год журнала: 2022, Номер 13(9), С. 1450 - 1450

Опубликована: Сен. 7, 2022

Understanding the response of tropospheric ozone (O3) to nitrogen dioxide (NO2) change is important for local O3 control. The relationship between and NO2 at county scale in China has been extensively studied using models, but there a lack results from direct measurements. In this study, we used measurements O3, meteorological conditions dense network Yangtze River Delta (YRD), satellite observed formaldehyde (HCHO) column densities analysis variabilities its NO2. As result, severe pollution occurred mainly Shanghai city, southern Jiangsu northern Zhejiang provinces YRD during April–September. addition, could explain 54% diurnal variation over YRD. During April–September 2015–2021, showed significant positive (r = 0.61 ± 0.10) with after removing impact conditions. However, be reversed concentration change. Our result suggested that controllable related up 100 μg·m−3 megacities province. much more sensitive reduction than surrounding areas. evaluate different impacts changes on formation, which provides explanation simultaneously alleviated reduced 2020 Zhejiang, as well increased most counties before 2019 October–March. driving mechanism revealed study will valuable abatement through sub-county China.

Язык: Английский

Процитировано

8