Article
Environmental Sciences
Can Xia, Junying Sun, Xinyao Hu, Xiaojing Shen, Yangmei Zhang, Sinan Zhang, Jialing Wang, Quan Liu, Jiayuan Lu, Shuo Liu, Xiaoye Zhang
Summary: The influence of relative humidity on aerosol properties and the direct radiative forcing of PM10 and PM1 were examined in Beijing from January 2018 to December 2019. Results showed that the scattering hygroscopic growth factor of PM10 and PM1, as indicated by f(80%), had an annual mean of 1.60 +/- 0.24 and 1.58 +/- 0.22, respectively. The seasonal variation of f(80%) was higher in spring and summer, and lower in autumn and winter. The study found that humidity has a significant impact on aerosol properties and direct radiative forcing.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Meteorology & Atmospheric Sciences
Annan Chen, Chuanfeng Zhao, Lixing Shen, Tianyi Fan
Summary: Based on the analysis of particle size and absorptivity, aerosols can be divided into four categories: coarse and absorptive aerosols (Type I), mixed aerosols (Type II), fine and absorptive aerosols (Type III), and fine and non-absorptive aerosols (Type IV). The aerosol types and their corresponding radiative forcing efficiency (RFE) exhibit seasonal variations on different continents. The RFEsfc and RFEtoa reach their maximum (minimum) values over Asia and North America (Europe, Oceania, and South America) from June to August. The study also investigates the effects of solar zenith angle, surface albedo, and single-scattering albedo on RFEsfc and RFEtoa. Overall, the research findings suggest that larger particles have a greater cooling effect by reflecting more solar energy into space, while the surface albedo and single-scattering albedo influence the absolute values of RFEsfc and RFEtoa.
ATMOSPHERIC RESEARCH
(2023)
Article
Environmental Sciences
Xinyao Hu, Junying Sun, Can Xia, Xiaojing Shen, Yangmei Zhang, Xiaoye Zhang, Sinan Zhang
Summary: The study in Beijing investigated the aerosol scattering properties of submicron and sub-10 mu m particles under dry conditions. It found that controlling fine particle pollution is crucial to reduce overall PM pollution in urban Beijing. The decrease in scattering coefficients for PM10 and PM1 in 2019 compared to 2018 was similar to the decrease in mass concentrations. The dominant role of fine particles in the size distribution was indicated by the scattering Angstrom exponent and high submicron scattering ratio.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Zhiheng Wang, Yafen Ge, Shasha Bi, Yongmei Liang, Quan Shi
Summary: This study collected atmospheric PM2.5 samples in Beijing and analyzed the organic compounds using multiple mass spectrometric techniques, revealing the molecular characteristics and structural features of the urban organic aerosol. The results showed significant differences in the species, abundance, and subgroups of organic compounds in the aerosol. These findings provide important insights into the composition and physicochemical properties of organic aerosols.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Rajae Meziane, Mohammed Diouri, Abdelmoula Ben-tayeb, Hanae Steli, Nadia Yousra Meziani
Summary: Decadal aerosol optical depth measurements in Beijing by the AERONET network showed that the annual mean values were higher than the air quality threshold defined by WHO, mainly influenced by anthropogenic aerosols. Aerosol radiative forcing remained relatively constant, with a warming tendency in the atmospheric column.
AIR QUALITY ATMOSPHERE AND HEALTH
(2022)
Article
Environmental Sciences
K. M. Markowicz, J. Lisok, P. Xian
Summary: This study presents the climatology of aerosol optical properties and radiative forcing over the Arctic, showing different contributions of various aerosol types to aerosol optical depth and their impact on radiative forcing. Cloud cover reduces surface cooling effect and shifts the radiative forcing towards positive values.
ATMOSPHERIC ENVIRONMENT
(2021)
Article
Environmental Sciences
Yueming Dong, Jing Li, Xing Yan, Chong Li, Zhongjing Jiang, Changrui Xiong, Liang Chang, Lu Zhang, Tong Ying, Zhenyu Zhang, Menghua Wang
Summary: In this study, a machine learning based algorithm is developed to retrieve aerosol single scattering albedo (SSA) using joint surface visibility and satellite radiation measurements. By combining MODIS measured top of the atmosphere apparent reflectance with ground visibility and other auxiliary parameters, SSA is retrieved at over 6000 visibility stations worldwide. The validation results show high consistency with AERONET retrieved SSA, with high correlations and low mean absolute bias values.
REMOTE SENSING OF ENVIRONMENT
(2023)
Article
Meteorology & Atmospheric Sciences
Gopinath Nandini, V. Vinoj, Satyendra Kumar Pandey
Summary: The study investigates the correlation between dust aerosol loading over the Arabian Sea and rainfall over Central India, and how this correlation is influenced by the El-Nino Southern Oscillation (ENSO). The findings show a positive correlation between aerosol loading and rainfall, with the highest correlation during El-Nino years. Regardless of ENSO phase, high aerosol loading conditions are associated with increased winds and enhanced rainfall over Central India.
NPJ CLIMATE AND ATMOSPHERIC SCIENCE
(2022)
Article
Environmental Sciences
Sheila Dewi Ayu Kusumaningtyas, Kenichi Tonokura, Edvin Aldrian, David M. Giles, Brent N. Holben, Dodo Gunawan, Puji Lestari, Windy Iriana
Summary: This study analyzes the seasonal variations of aerosol optical and radiative properties in different regions of Indonesia. The results show a distinct seasonal pattern in all sites except Bandung, where aerosol optical depth (AOD) increased during the dry season due to forest and peat fire outbreaks. The biomass burning sites exhibited wider ranges of observed Angstrom Exponent (AE) and high Fine Mode Fraction (FMF) during the dry burning period. Bandung had more aerosol distribution in a specific range of FMF and AE values, suggesting complex aerosol emissions from different sources and the formation of secondary aerosols. The biomass burning aerosols in Indonesia tend to cool the atmosphere with strong scattering rather than absorbing.
ATMOSPHERIC ENVIRONMENT
(2022)
Article
Engineering, Chemical
K. M. Markowicz, O. Zawadzka-Manko, J. Lisok, M. T. Chilinski, P. Xian
Summary: The impact of moderately absorbing aerosols on the energy budget over Central Europe in the summer of 2015 is discussed, with aerosol events mainly attributed to biomass burning transport from Eastern Europe. Various observational and model-based approaches estimate shortwave aerosol radiative forcings at the surface and the top of the atmosphere, showing differences in aerosol effects between methods.
JOURNAL OF AEROSOL SCIENCE
(2021)
Article
Environmental Sciences
Xiaofei Dong, Bin Chen, Akihiro Yamazaki, Guangyu Shi, Ning Tang
Summary: Atmospheric aerosols play a significant role in climate and environment, making the study of aerosol optical properties crucial for understanding climate change and atmospheric conditions. The variations in Beijing's aerosol optical properties were examined based on SKYNET data from March 2016 to December 2019. Higher values of AOD and AE during summer suggest the need to focus on fine particle pollution during this season. Comparisons between SKYNET and AERONET data show consistent monthly variations in aerosol optical depth. The identification of different aerosol modes provides insights into their optical and radiative properties, highlighting the dominance of weakly absorbing aerosols in Beijing's radiation transport. The combination of CALIPSO and SKYNET data further validates the scientific relevance of the findings. The use of the random forest algorithm effectively interpolates missing AOD500nm observations, as confirmed by the fitting with MODIS. This research is of great significance in understanding the impacts of aerosols on climate and the environment and reducing uncertainties in the Earth's radiation budget. It also provides scientific support for pollution prevention and control measures.
ATMOSPHERIC ENVIRONMENT
(2023)
Article
Engineering, Environmental
Yan Li, Lu Lei, Jiaxing Sun, Yueqi Gao, Peng Wang, Siyu Wang, Zhaolei Zhang, Aodong Du, Zhijie Li, Zifa Wang, Jin Young Kim, Hwajin Kim, Hongliang Zhang, Yele Sun
Summary: The study found that secondary inorganic aerosol and photochemical-related secondary organic aerosol significantly decreased in Beijing summers, while the decreases in primary aerosol species and gaseous precursors were comparably small. Meteorology and emission reductions play important roles in aerosol composition and formation mechanisms.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Zhijie Li, Weiqi Xu, Wei Zhou, Lu Lei, Jiaxing Sun, Bo You, Zifa Wang, Yele Sun
Summary: This study investigates the chemical differences between submicron aerosol (PM1) species and fine particles (PM2.5) in Beijing, China, using a high-resolution AMS and a time-of-flight ACSM. The results show that aerosol species in PM2.5 are highly correlated with those in PM1, but the PM1/PM2.5 ratios vary greatly for different species. Nitrate is dominant in PM1, while a significant fraction of sulfate is observed in the PM1-2.5 range. PM1 organics show higher fractions in PM2.5 in summer. The study also compares the source apportionment of organic aerosol (OA) between PM1 and PM2.5, revealing substantial differences in primary and secondary OA composition, especially in winter. Additionally, a parameterized relationship between oxygen-to-carbon ratio and CV f44 is developed, which has implications for studying the oxidation and hygroscopicity properties of OA.
ATMOSPHERIC ENVIRONMENT
(2023)
Article
Environmental Sciences
Weiqi Xu, Chun Chen, Yanmei Qiu, Ying Li, Zhiqiang Zhang, Eleni Karnezi, Spyros N. Pandis, Conghui Xie, Zhijie Li, Jiaxing Sun, Nan Ma, Wanyun Xu, Pingqing Fu, Zifa Wang, Jiang Zhu, Douglas R. Worsnop, Nga Lee Ng, Yele Sun
Summary: The study reveals that volatility and viscosity of aerosols in the North China Plain are significantly impacted by various factors, leading to differences in composition and formation pathways among different organic aerosol factors. The results suggest that kinetically limited gas-particle partitioning may play a crucial role in simulating secondary organic aerosol formation in the region.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)
Article
Environmental Sciences
Natalia E. Chubarova, Heike Vogel, Elizaveta E. Androsova, Alexander A. Kirsanov, Olga B. Popovicheva, Bernhard Vogel, Gdaliy S. Rivin
Summary: Urban aerosol pollution over the Moscow megacity region was analyzed using the COSMO-ART model system and intensive measurements, revealing a strong correlation between black carbon and concentrations of NO2 and PM10, with the BC/PM10 ratio increasing with a decrease in the intensity of particle dispersion.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Review
Environmental Sciences
Ting Yang, Hongyi Li, Haibo Wang, Youwen Sun, Xi Chen, Futing Wang, Lei Xu, Zifa Wang
Summary: This article mainly discusses the spatiotemporal distribution and vertical structure characteristics of aerosols using observations and numerical models to understand aerosol pollution and its effects. However, the limitations of observations and uncertainties of numerical models introduce biases in aerosol calculations and predictions. Data assimilation integrates observations and numerical models to improve model accuracy and facilitate the development of atmospheric aerosol pollution research.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2023)
Article
Environmental Sciences
Di Liu, Shaofeng Xu, Yunchao Lang, Shengjie Hou, Lianfang Wei, Xiaole Pan, Yele Sun, Zifa Wang, Kimitaka Kawamura, Pingqing Fu
Summary: This study investigated the source, formation, and seasonality of biogenic secondary organic aerosol (BSOA) in Beijing, China from April 2017 to January 2018. BSOA tracers derived from isoprene, monoterpene, and sesquiterpene were measured and showed significant seasonal variations. Isoprene SOA tracers correlated with biomass burning and long-range transport, while sesquiterpene SOA tracer was associated with local biomass burning. These results suggest that BSOA tracers are promising for understanding the source, formation, and seasonality of BSOA.
ENVIRONMENTAL POLLUTION
(2023)
Article
Engineering, Environmental
Jing Wei, Zhanqing Li, Xi Chen, Chi Li, Yele Sun, Jun Wang, Alexei Lyapustin, Guy Pierre Brasseur, Mengjiao Jiang, Lin Sun, Tao Wang, Chang Hoon Jung, Bing Qiu, Cuilan Fang, Xuhui Liu, Jinrui Hao, Yan Wang, Ming Zhan, Xiaohong Song, Yuewei Liu
Summary: In this study, a four-dimensional spatiotemporal deep forest model was used to estimate the chemical composition of PM2.5 in China. The results show that secondary inorganic aerosols (SIAs) are a major component of PM2.5, and their proportion has been decreasing in the eastern region. During the COVID-19 lockdown, there was a sharp decline in SIA concentrations and an increase in SIA-to-PM2.5 ratios, indicating enhanced atmospheric oxidation capacity and the formation of secondary particles.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Jiangchuan Tao, Ye Kuang, Biao Luo, Li Liu, Hanbin Xu, Nan Ma, Pengfei Liu, Biao Xue, Miaomiao Zhai, Wanyun Xu, Weiqi Xu, Yele Sun
Summary: The commercial continuous-flow streamwise thermal-gradient cloud condensation nuclei (CCN) counter is commonly used for measuring aerosol CCN activity. In this study, we found that droplet growth in the CCN counter is kinetically limited and CCN-active droplets do not reach their theoretical diameters under low supersaturations. Ignoring kinetic growth limitation in CCN identification may result in underestimation of CCN counting and the aerosol hygroscopicity parameter κ by up to 50% for supersaturations lower than 0.1%. We recommend the use of thresholds considering kinetic limitations as new criteria for CCN identification under low supersaturations.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Zhilan Ye, Jie Li, Xueshun Chen, Wenyi Yang, Huiyun Du, Tao Wang, Qian Ye, Yujing Zhang, Zixi Wang, Zhe Wang, Zifa Wang
Summary: This study aims to establish an optimal emission reduction system through linear programming based on source analysis, PM2.5 sensitivity, emission status, and pollution conditions. Compared to the equal proportion scenario, the optimal proportion scenario not only has lower emission reduction ratios but also greater air quality improvement. Through technological upgrading and industrial transfer from North China to Northwest China, the goal of eliminating PMCPDs in North China can be achieved, and a zero-increase relative to the business as usual scenario can also be achieved in Northwest China.
ATMOSPHERIC POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Xiaoyong Liu, Jun Yan, Zifa Wang, Xiaole Pan, Fangcheng Su, Junhui Yan, Jiqiang Niu
Summary: Surface ozone pollution is an important environmental problem in China. We conducted a study to investigate the influence of meteorological factors and emissions on ozone concentrations in coastal cities. The study found that ozone concentrations increased from 2015 to 2019 and decreased in 2020, and different components on different timescales had varying effects on ozone concentrations.
AIR QUALITY ATMOSPHERE AND HEALTH
(2023)
Article
Meteorology & Atmospheric Sciences
Ning Yang, Qiaorong Xie, Xinxing Zhang, Shujun Zhong, Wei Hu, Junjun Deng, Libin Wu, Ming Sheng, Mutong Niu, Dandan Liu, Jialei Zhu, Yong Chen, Jing Duan, Xiaole Pan, Yele Sun, Zifa Wang, Pingqing Fu
Summary: This study investigates the photochemical processes between organic coatings and aqueous samples such as fogwater, which contain light absorbing brown carbon (BrC). Through laboratory studies and field observations, it is found that unsaturated fatty acids can interact with aqueous samples, forming organic peroxy radicals and undergoing oxidation pathways. The results also suggest that the interaction between organic acids and hydroxyl radicals (OH) has a higher oxidative capacity than OH alone. In addition, oleic acid is shown to enhance the aqueous oxidation ability by producing oxygen-containing radicals.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Meteorology & Atmospheric Sciences
Weiqi Xu, Zhijie Li, Zhiqiang Zhang, Jinjian Li, Eleni Karnezi, Andrew T. T. Lambe, Wei Zhou, Jiaxing Sun, Aodong Du, Ying Li, Yele Sun
Summary: This study characterized the changes in physicochemical properties of organic aerosol (OA) during photochemical aging using burning and cooking experiments. The mass spectra of OA showed significant changes during aging, indicating the production of more volatile secondary OA. Additionally, the size distributions, volatility, and glass transition temperature of OA varied during aging for different primary emissions.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Meteorology & Atmospheric Sciences
Yan Li, Jiaxing Sun, Yongheng Bi, Qingqing Wang, Xiujuan Zhao, Lu Lei, Aodong Du, Zhijie Li, Zifa Wang, Xiaole Pan, Congzheng Han, Yele Sun
Summary: The impact of precipitation on different aerosol species in megacities, particularly in Beijing, was investigated using highly time-resolved measurements of aerosol chemical speciation monitor and precipitation. It was found that precipitation processes can have significant effects on aerosol composition, with different responses depending on the intensity, duration, and formation mechanisms of rainfall.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Environmental Sciences
Wanyun Xu, Yuxuan Bian, Weili Lin, Yingjie Zhang, Yaru Wang, Zhiqiang Ma, Xiaoyi Zhang, Gen Zhang, Chunxiang Ye, Xiaobin Xu
Summary: This study investigated the variations of O-3 and PAN at Nam Co station in the southern Tibetan Plateau and found that their changes were influenced by distinct transport processes and photochemistry. O-3 variations were primarily controlled by stratosphere-troposphere exchange, while PAN concentrations were affected by air masses crossing polluted regions before entering the Tibetan Plateau.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Green & Sustainable Science & Technology
Yuxuan Zhang, Hang Su, Simonas Kecorius, Nan Ma, Zhibin Wang, Yele Sun, Qiang Zhang, Ulrich Poeschl, Alfred Wiedensohler, Meinrat O. Andreae, Yafang Cheng
Summary: Black carbon aerosols have a significant impact on climate systems, and estimating their radiative effect requires understanding their mixing state and light absorption enhancement from coatings. Observations have shown lower light absorption enhancement factors (Eabs) than expected, leading to a debate on the true magnitude of BC's climate impact. However, considering the presence of extremely low-volatility (eLV) organics in BC coatings, the estimates of Eabs increase substantially. Our results highlight a strong radiative warming effect from atmospheric BC.
Article
Environmental Sciences
Lei Kong, Xiao Tang, Jiang Zhu, Zifa Wang, Yele Sun, Pingqing Fu, Meng Gao, Huangjian Wu, Miaomiao Lu, Qian Wu, Shuyuan Huang, Wenxuan Sui, Jie Li, Xiaole Pan, Lin Wu, Hajime Akimoto, Gregory R. Carmichael
Summary: The lockdown measures during the COVID-19 pandemic in China had limited impact on air pollution, and traffic control alone cannot effectively address O-3 and PM2.5 pollution.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Environmental Sciences
Joanna E. Dyson, Lisa K. Whalley, Eloise J. Slater, Robert Woodward-Massey, Chunxiang Ye, James D. Lee, Freya Squires, James R. Hopkins, Rachel E. Dunmore, Marvin Shaw, Jacqueline F. Hamilton, Alastair C. Lewis, Stephen D. Worrall, Asan Bacak, Archit Mehra, Thomas J. Bannan, Hugh Coe, Carl J. Percival, Bin Ouyang, C. Nicholas Hewitt, Roderic L. Jones, Leigh R. Crilley, Louisa J. Kramer, W. Joe F. Acton, William J. Bloss, Supattarachai Saksakulkrai, Jingsha Xu, Zongbo Shi, Roy M. Harrison, Simone Kotthaus, Sue Grimmond, Yele Sun, Weiqi Xu, Siyao Yue, Lianfang Wei, Pingqing Fu, Xinming Wang, Stephen R. Arnold, Dwayne E. Heard
Summary: The impact of heterogeneous uptake of HO2 on aerosol surfaces on radical concentrations and the O-3 production regime in Beijing in summertime was investigated. The average uptake coefficient of HO2 was calculated as 0.070 +/- 0.035, significantly lower than commonly used values. The result suggests that under most conditions, HO2 uptake onto aerosol surfaces is not important, but at low NO concentrations, it can contribute significantly to the loss of HO2.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Environmental Sciences
Shujun Zhong, Shuang Chen, Junjun Deng, Yanbing Fan, Qiang Zhang, Qiaorong Xie, Yulin Qi, Wei Hu, Libin Wu, Xiaodong Li, Chandra Mouli Pavuluri, Jialei Zhu, Xin Wang, Di Liu, Xiaole Pan, Yele Sun, Zifa Wang, Yisheng Xu, Haijie Tong, Hang Su, Yafang Cheng, Kimitaka Kawamura, Pingqing Fu
Summary: Biomass burning is a key source of urban aerosols in the North China Plain, with limited knowledge on the influence of biogenic SOA loading on the molecular composition of wintertime organic aerosols. Water-soluble organic compounds in PM2.5 from urban Tianjin were analyzed, revealing that biomass burning contributes to the majority of CHO and CHON compounds. The chemistry and level of biogenic SOA loading plays a significant role in the formation of secondary compounds, including CHO, CHON, CHOS, and CHONS. The hydrolysis of nitrooxy-organosulfates is identified as a possible pathway for the formation of organosulfates.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
