Aerosol vertical distribution and sources estimation at a site of the Yangtze River Delta region of China

Fan, Wenzhi; Qin, Kai; Xu, Jian; Yuan, Limei; Li, Ding; Jin, Zi Wen; Zhang, Kefei

doi:10.1016/j.atmosres.2018.11.002

Cited by 55 publications

(25 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The wind speed and direction, and the distance between the two sites suggest that air mass transported from CUHK to KP along the northeast‐southwest direction. Figure shows that the result was confirmed by back trajectory analysis before 00:00 HKT October 2 at these two sites (W. Fan et al., 2019).…”

Section: Resultssupporting

confidence: 64%

Assessing Transboundary‐Local Aerosols Interaction Over Complex Terrain Using a Doppler LiDAR Network

Huang

Cheng

et al. 2021

Geophysical Research Letters

View full text Add to dashboard Cite

Transboundary‐local aerosols interaction requires to be comprehensively understood in urban air quality research. A year‐long intensive observation of the atmospheric boundary layer (ABL) at multiple sites in Hong Kong was conducted using a four‐Doppler Light Detection and Ranging (LiDAR) network with different scanning modes. Results show that heterogeneity of the ABL in terms of mixing layer height and wind shear was induced by orographic topography. Interaction between local and advected aerosol layers during a transboundary air pollution (TAP) episode was identified by the network. During TAP episode, downward transport of transboundary aerosol relied on small scale eddies with weak wind speed in nighttime, while the transport of surface local aerosol to upper level was the dominated process in daytime, but the heterogeneity of the ABL affected by terrain determined the capacity of the mixing, eventually resulting in the opposite transport direction of aerosols in the transboundary‐local aerosols interaction.

show abstract

Section: Resultssupporting

confidence: 64%

Assessing Transboundary‐Local Aerosols Interaction Over Complex Terrain Using a Doppler LiDAR Network

Huang

Cheng

et al. 2021

Geophysical Research Letters

View full text Add to dashboard Cite

show abstract

“…Ground-based light detection and ranging (lidar) is a useful instrument for monitoring the vertical structure of atmosphere at high temporal and spatial resolution, especially in the PBL (e.g., Fan et al, 2019 ;Liu et al, 2013 ;Manninen et al, 2018 ;Osborne et al, 2019 ;Pearson et al, 2010 ;Qin et al, 2016 ;Su et al, 2018). In particular, ground-based Doppler lidars can be deployed to remotely monitor vertical and horizontal winds and mixing processes to identify aerosol transport in the lower level of the atmosphere and to explore dynamic features of the PBL (Barlow et al, 2011;Harvey et al, 2013;Manninen et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Heavy Particulate Matter Pollution Events Over Hong Kong and Their Relationships With Vertical Wind Profiles Using High‐Time‐Resolution Doppler Lidar Measurements

et al. 2019

View full text Add to dashboard Cite

Previous studies have reported boundary layer features related to air pollution. However, few studies have comprehensively evaluated the characteristics and mechanisms of vertical wind in the formation and evolution of heavy particulate matter pollution episodes (EP) in Hong Kong. In this study, we analyzed the vertical characteristics of heavy particulate matter (PM) pollutions over Hong Kong and their relationships with vertical wind profiles using high‐time‐resolution Doppler lidar measurements and hourly meteorological and air quality observations. We identified nine EPs and show that the events were closely coupled to various vertical wind profiles in the planetary boundary layer (PBL). Our analysis suggests that strong vertical wind speed with wind shear at certain heights in the PBL had a positive correlation with surface PM during most superregional transboundary EPs. The maximum transport height extends from the surface to about 2.0 km or even higher; these transport heights differed among superregional and regional transboundary EPs. At peak surface pollution concentrations during the nine EPs, the surface PM10 had a significant negative correlation with PBL heights/mixing layer heights, while the averaged wind shear in the PBL was significantly positively correlated. These EPs with different mixing layer heights were mainly driven by different vertical wind shear conditions under various weather systems related to surface high pressure, cold fronts, dust storms, and typhoons. This work provides scientific evidence that surface PM pollutions were closely related to the characteristics of vertical profiles during the transboundary air pollutions.

show abstract

“…Therefore, understanding the key processes that drive the dynamic temporal and spatial evolutionary characteristics of pollutants on the NCP is essential for revealing the source and transport of aerosols, which has different radiative forcing at different heights (Kumar et al, 2017). Actually, stereo-monitoring devices and technologies, such as lidar (Chen et al, 2019b;Fan et al, 2019;Sheng et al, 2019), MAX-DOAS (Hong et al, 2018;, and satellite remote sensing (Pang et al, 2018;Schwartz et al, 2012;Zhang et al, 2019a), can reveal the vertical distribution of pollutants at different heights (Heese et al, 2017;Tian et al, 2017). Due to the limited spatial and temporal observations, however, it is impossible to provide physical and chemical properties in the atmosphere at any time period and on any path, which makes it difficult to directly reveal the formation and source of pollution.…”

Section: Introductionmentioning

confidence: 99%

Comment on acp-2020-1273

2021

View full text Add to dashboard Cite

China has made great efforts to monitor and control air pollution in the past decade.Comprehensive characterization and understanding of pollutants in three-dimension (3-D) are, however, still lacking. Here, we used data from an observation network consisting of 13 aerosol lidars and more than 1000 ground observation stations, combined with a data assimilation technique, to conduct a comprehensive analysis of an extreme heavy aerosol pollution (HAP) over the North China Plain (NCP) from November-December 2017. During the studied period, the maximum hourly mass concentration of surface PM2.5 reached ~390 μg•m -3 . After assimilation, the correlation between model results and the independent observation subdataset was ~50% higher than the that without the assimilation, and the root mean square error was reduced by ~40%. From pollution development to dissipation, we divided the HAP in the NCP (especially in Beijing) into four phases-an early phase (EP), a transport phase (TP), an accumulation phase (AP), and a removal phase (RP). We then analyzed the evolutionary characteristics of PM2.5 concentration during different phases on the surface and in 3-D space.We found that the particles were mainly transported from south to north at a height of 1-2 km (during EP and RP) and near the surface (during TP and AP). The amounts of PM2.5 advected into Beijing with the maximum transport flux intensity (TFI) were through the pathways in the relative order of the southwest > southeast > east pathways. The dissipation of PM2.5 in the RP stage (with negative TFI) was mainly from north to south, with an average transport height of ~1 km above the surface. Our results quantified the multi-dimensional distribution and evolution of PM2.5 concentration over the NCP, which may help policymakers develop efficient air pollution control strategies.

show abstract

Aerosol vertical distribution and sources estimation at a site of the Yangtze River Delta region of China

Abstract: Aerosol vertical distribution and sources estimation at a site of the Yangtze River Delta region of China Wenzhi Fan a , Kai Qin a,*

Cited by 55 publications

References 57 publications

Assessing Transboundary‐Local Aerosols Interaction Over Complex Terrain Using a Doppler LiDAR Network

Assessing Transboundary‐Local Aerosols Interaction Over Complex Terrain Using a Doppler LiDAR Network

Characteristics of Heavy Particulate Matter Pollution Events Over Hong Kong and Their Relationships With Vertical Wind Profiles Using High‐Time‐Resolution Doppler Lidar Measurements

Comment on acp-2020-1273

Contact Info

Product

Resources

About