Aijun Ding

Aijun Ding
Nanjing University | NJU · School of Atmospheric Sciences

Phd

About

313
Publications
128,895
Reads
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14,729
Citations
Citations since 2016
215 Research Items
12341 Citations
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201620172018201920202021202205001,0001,5002,0002,500
201620172018201920202021202205001,0001,5002,0002,500
Additional affiliations
September 2009 - present
Nanjing University
Position
  • Professor (Full)
May 2009 - August 2009
The Hong Kong Polytechnic University
Position
  • Research Associate
October 2004 - May 2009
The Hong Kong Polytechnic University
Position
  • PostDoc Position

Publications

Publications (313)
Article
Full-text available
Eastern China has been frequently suffering from air pollution problems in the past decades. Besides the intensive emissions, weather‐system evolution is generally regarded as an important factor influencing air quality, among which cold fronts are of great importance in regulating the synoptic‐scale variations of regional pollution. Despite numero...
Article
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Plain Language Summary New particle formation (NPF) is a worldwide phenomenon and is regarded as a major contributor to the global cloud condensation nuclei (CCN) as well as to air pollution. Given the vertically varied cloud distribution and the vital role of NPF in CCN, it is of great importance to understand the vertical structure of NPF. Howeve...
Article
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Ammonium salt is an important component of particulate matter with aerodynamic diameter less than 2.5 µm (PM2.5) and has significant impacts on air quality, climate, and natural ecosystems. However, a fundamental understanding of the conversion kinetics from ammonia to ammonium in unique environments of high aerosol loading is lacking. Here, we rep...
Article
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Air pollution is known to be harmful for human health and environments. The official air quality monitoring stations have been established across many smart cities around the world. Unfortunately, these monitoring stations are sparsely located and consequently do not provide high resolution spatio-temporal air quality information. This paper demons...
Preprint
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Volatilization of ammonia (NH3) from fertilizer application and livestock wastes is an overwhelmingly important pathway of nitrogen losses in agricultural ecosystems and constitutes the largest source of atmospheric NH3. The volatilization of NH3 highly depends on environmental and meteorological conditions, however, this phenomenon is poorly descr...
Preprint
Wildfire in Siberia is of paramount importance in the carbon cycle and climate change as it is a major disturbance in the pan-Arctic ecosystems. In recent decades, the Siberian wildfire regime has been changing; however, less is known about the key climatic drivers and the underlying feedback over these vulnerable fire-prone landscapes. Here, based...
Preprint
Full-text available
Black carbon (BC) plays an important role in the climate system due to its strong warming effect, yet the magnitude of this effect is highly uncertain due to the complex mixing state of aerosols. Here we build a unified theoretical framework to describe BC’s mixing states, linking dynamic processes to BC coating thickness distribution, and show its...
Article
The North China Plain has been suffering from severe haze pollution in the past few decades. In addition to rapid urbanization and intensive anthropogenic emissions, the complex terrain in this region greatly influences the atmospheric circulation, thereby weakening the ventilation of air pollutants. Nevertheless, the vertical responses of surface-...
Article
China has been frequently suffering from haze pollution in the past several decades. As one of the most emission-intensive regions, the North China Plain (NCP) features severe haze pollution with multiscale variations. Using more than 30 years of visibility measurements and PM2.5 observations, a subseasonal seesaw phenomenon of haze in autumn and e...
Article
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As one of the largest dust source regions, China suffers from frequent dust storms in spring. During the super dust storm in March 2021, a rapid increase in nocturnal surface ozone concentration was observed along with elevated dust loading. Ground-based and satellite observations as well as reanalysis data of air quality and meteorology are integr...
Article
A great challenge for haze pollution mitigation with the existing emission control measures in China is ozone (O3) increase. The chemical processes leading to weakened haze mitigation are still poorly understood. Our work identifies the enhanced aging chemistries of black carbon (BC) with increasing O3 as an essential driver to weaken haze mitigati...
Article
Full-text available
Plain Language Summary Black Carbon (BC) widely affects the Earth system as a warming agent. However, estimates of the effective radiative forcing from aerosol‐radiation interaction (ERFari) by anthropogenic BC remain disputable with recent studies arguing for a downward revision, and therefore require better constraints. Here we find that atmosphe...
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Tropospheric anthropogenic aerosols contribute the second-largest forcing to climate change, but with high uncertainty owing to their spatio-temporal variability and complicated optical properties. In this Review, we synthesize understanding of aerosol observations and their radiative and climate effects. Aerosols offset about one-third of the warm...
Preprint
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Extreme wildfires increasingly threaten human lives, infrastructure, air quality, and ecosystem services. Meteorology plays a vital role in wildfire activities, and thus the relationship between wildfire intensity and climate change has been widely studied. However, it remains unclear how fire-weather interactions affect short-term fire variability...
Article
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The Pan-Eurasian Experiment (PEEX) Science Plan, released in 2015, addressed a need for a holistic system understanding and outlined the most urgent research needs for the rapidly changing Arctic-boreal region. Air quality in China, together with the long-range transport of atmospheric pollutants, was also indicated as one of the most crucial topic...
Article
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Secondary organic aerosol contributes a significant fraction to aerosol mass and toxicity. Low-volatility organic vapours are critical intermediates connecting the oxidation of volatile organic compounds to secondary organic aerosol formation. However, the direct measurement of intermediate vapours poses a great challenge. Here we present coordinat...
Article
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Purpose of Review Atmospheric aerosol from both natural and anthropogenic activities has long been acknowledged as one of the important factors influencing regional and global climate change. Many regions around the globe experienced high aerosol loadings because of intensive emissions, yet the roles of atmospheric aerosols in extreme meteorologica...
Article
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Aerosols could affect the thermal radiation process of planetary boundary layer (PBL), thus changing its thermodynamic and circulation structure and further triggering changes in aerosol concentrations. However, previous studies mostly focused on the direct health impacts of aerosols and meteorological conditions in the boundary layer and little is...
Article
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New particle formation (NPF) induces a sharp increase in ultrafine particle number concentrations and potentially acts as an important source of cloud condensation nuclei (CCN). As the densely populated area of China, the Yangtze River Delta (YRD) region shows a high frequency of observed NPF events at the ground level, especially in spring. Althou...
Article
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Molecular chlorine (Cl2) affects atmospheric oxidative capacity by generating chlorine radicals upon photolysis, but it is poorly simulated in atmospheric chemistry models. In this study, we observed up to 40 ppt Cl2 around noon at a suburban site in East China, and used a box model with up‐to‐date chlorine chemistry and comprehensive observational...
Article
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Regional transport has been identified as an important contributor to air pollution. Yet, understanding the evolution of aerosol components associated with synoptic systems remains limited, particularly in China, where most of the measurement studies were conducted at the ground surface. In this study, an intensive campaign was designed with aircra...
Article
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Recent evidence shows that carbon emissions in China are likely to peak ahead of 2030. However, the social and economic impacts of such an early carbon peak have rarely been assessed. Here we focus on the economic costs and health benefits of different carbon mitigation pathways, considering both possible socio-economic futures and varying ambition...
Article
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Air quality low-cost sensors are affordable and can be deployed in massive scale in order to enable high-resolution spatio-temporal air pollution information. However, they often suffer from sensing accuracy, in particular when they are used for capturing extreme events. We propose an intelligent sensors calibration method that facilitates correcti...
Preprint
During the COVID-19 lockdown, the dramatic reduction of anthropogenic emissions provided a unique opportunity to investigate the effects of reduced anthropogenic activity and primary emissions on atmospheric chemical processes and the consequent formation of secondary pollutants. Here, we utilize comprehensive observations to examine the response o...
Article
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Ozone pollution that threatens human health and the ecosystem is a global environmental challenge. In megacities, ozone pollution has long been mainly attributed to anthropogenic sources. However, the processes and mechanisms of cross-regional transport of ozone and its precursors under interactions between mixed sources remain unclear. Here, we sh...
Article
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The mixing states of particulate amines with different chemical components are of great significance in studying the formation and evolution processes of amine-containing particles. In this work, the mixing states of single particles containing trimethylamine (TMA) and diethylamine (DEA) are investigated using a high-performance single-particle aer...
Article
Particulate organic nitrates (pON) are important species in the atmosphere that influence reactive nitrogen cycling and ozone (O3) formation. Previous studies on pON focus on forest regions involving anthropogenic NOx emissions. Therefore, the investigation and quantitation of pON in polluted urban regions remain limited. Here, we conducted samplin...
Article
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Low clouds play a key role in the Earth-atmosphere energy balance and influence agricultural production and solar-power generation. Smoke aloft has been found to enhance marine stratocumulus through aerosol-cloud interactions, but its role in regions with strong human activities and complex monsoon circulation remains unclear. Here we show that bio...
Article
Biogenic emissions are widely known as important precursors of ozone, yet there is potentially a strong interaction and synergy between biogenic and anthropogenic emissions, including volatile organic compounds (VOCs) and nitrogen oxides (NOx), in modulating ozone formation. To a large extent, the synergy affects the effectiveness of anthropogenic...
Article
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Oxygenated organic molecules (OOMs) are the crucial intermediates linking volatile organic compounds (VOCs) to secondary organic aerosols (SOAs) in the atmosphere, but comprehensive understanding of the characteristics of OOMs and their formation from VOCs is still missing. Ambient observations of OOMs using recently developed mass spectrometry tec...
Preprint
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Wildfires threaten human lives, destroy infrastructure, disrupt economic activity, and damage ecosystem services. A record-breaking gigafire event ravaged the western United States (USA) in mid-September 2020, burning 1.2 million acres (4,900 km2) in Oregon and California, and resulting in severe smoke pollution with daily fine particulate matter (...
Article
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As a symbol of civilization and culture, architecture was originally developed for sheltering people from unpleasant weather or other environmental conditions. Therefore, architecture is expected to be sensitive to climate change, particularly to changes in the occurrence of extreme weather events. However, although meteorological factors are widel...
Article
Tropospheric ozone is a major pollutant that can harm human health, animals and plants. With a rapid development in Northeast China, ozone pollution has become an increasingly serious environmental challenge. To study the ozone distribution and the potential sources of ozone precursors in Northeast China, we analyzed vertical ozone profiles from th...
Article
Full-text available
In recent years, nitrate plays an increasingly important role in haze pollution and strict emission control seems ineffective in reducing nitrate pollution in China. In this study, observations of gaseous and particulate pollutants during the COVID-19 lockdown, as well as numerical modelling were integrated to explore the underlying causes of the n...
Article
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The effects of the urban morphological characteristics on the spatial variation of near-surface PM2.5 air quality were examined. Unlike previous studies, we performed the analyses in real urban environments using continuous observations covering the whole scale of urban densities typically found in cities. We included data from 31 measurement stati...
Preprint
Full-text available
The mixing states of particulate amines with different chemical components are of great significance in studying the formation and evolution processes of amine-containing particles. In this work, the mixing states of single particles containing trimethylamine (TMA) and diethylamine (DEA) are investigated in order to study the formation and aging pr...
Article
Full-text available
Submicron particles in polluted regions have received much attention because of their influences on human health and climate. A k‐means clustering technique was performed on a data set of particle number size distributions (PNSD) that was obtained over more than 3 years in the Yangtze River Delta (YRD) region of East China. With simultaneous measur...
Article
Full-text available
The eastern part of China as a whole is practically a gigacity; it is a conglomeration of megacities with circa 650 million inhabitants. The gigacity, with its emissions, processes in pollution cocktail, numerous feedbacks and interactions, has a crucial and big impact on regional air quality within itself and on global climate. A large-scale resea...
Preprint
Full-text available
The Pan-Eurasian Experiment (PEEX) Science Plan, released in 2015, addressed a need for a holistic system understanding and outlined the most urgent research needs for sustainable development in the Artic-boreal region. Air quality in China and long-range transport of the atmospheric pollutants was also indicated as one of the most crucial topics o...
Article
Full-text available
The development of low-cost sensors and novel calibration algorithms provides new hints to complement conventional ground-based observation sites to evaluate the spatial and temporal distribution of pollutants on hyperlocal scales (tens of meters). Here we use sensors deployed on a taxi fleet to explore the air quality in the road network of Nanjin...
Article
Full-text available
Gaseous sulfuric acid (H2SO4) is a crucial precursor for secondary aerosol formation, particularly for new particle formation (NPF) that plays an essential role in the global number budget of aerosol particles and cloud condensation nuclei. Due to technology challenges, global-wide and long-term measurements of gaseous H2SO4 are currently very chal...
Preprint
Full-text available
Oxygenated organic molecules (OOMs) are the crucial intermediates linking volatile organic compounds (VOCs) to secondary organic aerosol (SOA) in the atmosphere, but understandings on the characteristics of OOMs and their formations from VOCs are very limited. Ambient observations of OOMs using recently developed mass spectrometry techniques are st...
Article
Full-text available
Weather prediction is essential to the daily life of human beings. Current numerical weather prediction models such as the Global Forecast System (GFS) are still subject to substantial forecast biases and rarely consider the impact of atmospheric aerosol, despite the consensus that aerosol is one of the most important sources of uncertainty in pred...
Article
Full-text available
Plain Language Summary During the lockdown that was implemented to fight the COVID‐19 disease in China, most traffic and production activities were suddenly interrupted, resulting in unprecedented abrupt anthropogenic emission changes. We performed inverse modeling based on black carbon observations to reveal the regional changes of BC emissions in...