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PM2.5 over North China based on MODIS AOD and effect of meteorological elements during 2003‒2015

Youfang Chen, Yimin Zhou, Xinyi Zhao

Frontiers of Environmental Science & Engineering 2020, Volume 14, Issue 2, doi: 10.1007/s11783-019-1202-8

Abstract: The Taihang Mountains was the boundary between high and low pollution areas. There were one high value center for PM2.5 pollution and two low value centers. In 2004, 2009 and after 2013, PM2.5 concentration was relatively low. Over the past 40 years, PM2.5 pollution in North China has become increasingly serious and progressively exposes the densely populated areas to pollutants. However, due to limited ground data, it is challenging to estimate accurate PM2.5 exposure levels, further making it unfavorable for the prediction and prevention of PM2.5 pollutions. This paper therefore uses the mixed effect model to estimate daily PM2.5 concentrations of North China between 2003 and 2015 with ground observation data and MODIS AOD satellite data. The tempo-spatial characteristics of PM2.5 and the influence of meteorological elements on PM2.5 is discussed with EOF and canonical correlation analysis respectively. Results show that overall R2 is 0.36 and the root mean squared predicted error was 30.1 μg/m3 for the model prediction. Our time series analysis showed that, the Taihang Mountains acted as a boundary between the high and low pollution areas in North China; while the northern part of Henan Province, the southern part of Hebei Province and the western part of Shandong Province were the most polluted areas. Although, in 2004, 2009 and dates after 2013, PM2.5 concentrations were relatively low. Meteorological/topography conditions, that include high surface humidity of area in the range of 34°‒40°N and 119°‒124°E, relatively low boundary layer heights, and southerly and easterly winds from the east and north area were common factors attributed to haze in the most polluted area. Overall, the spatial distribution of increasingly concentrated PM2.5 pollution in North China are consistent with the local emission level, unfavorable meteorological conditions and topographic changes.

Keywords: Aerosol optical depth     PM2.5     MODIS     Mixed effect model     Canonical correlation analysis    

The Significant Contribution of Small-Sized and Spherical Aerosol Particles to the Decreasing Trend inTotal Aerosol Optical Depth over Land from 2003 to 2018 Article

Ke Gui, Huizheng Che, Lei Li, Yu Zheng, Lei Zhang, Hujia Zhao, Junting Zhong, Wenrui Yao, Yuanxin Liang, Yaqiang Wang, Xiaoye Zhang

Engineering 2022, Volume 16, Issue 9,   Pages 82-92 doi: 10.1016/j.eng.2021.05.017

Abstract:

The optical and microphysical properties of aerosols remain one of the greatest uncertainties associatedAlthough the trends in aerosol optical depth (AOD) at global and regional scales have been widely examinedHere, using the aerosol optical component dataset from the Multi-angle Imaging SpectroRadiometer (MISR) instrument, we investigate decadal-scale trends in total aerosol loading as well as AODs for five aerosolBy dividing the TAOD values into four different aerosol pollution levels (APLs) with splits at 0.15,

Keywords: AOD     MISR     Aerosol pollution levels     Aerosol type     Particle size and morphology    

Investigating the raveling test for full-depth reclamation

Robert HILL, Andrew BRAHAM

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 2,   Pages 222-226 doi: 10.1007/s11709-017-0423-9

Abstract: Full-Depth Reclamation (FDR) is a sustainable method of building pavement structure compared to more

Keywords: raveling     full depth reclamation    

Physical and chemical processes of wintertime secondary nitrate aerosol formation

Qi YING

Frontiers of Environmental Science & Engineering 2011, Volume 5, Issue 3,   Pages 348-361 doi: 10.1007/s11783-011-0343-1

Abstract: analysis (PA) scheme for gas and particulate matter (PM) to study the formation of secondary nitrate aerosol

Keywords: secondary nitrate aerosol     N2O5 heterogeneous reaction     process analysis    

Design and calibration of a new high-definition three-dimensional laparoscopic system

Jia TANG,Li-qiang WANG,Bo YUAN,Hong JIANG,Qi-ming ZHU

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 1,   Pages 79-84 doi: 10.1631/FITEE.1400149

Abstract: We present a high-definition (HD) 3D laparoscopic system including a dual channel optical system, twoA modified pinhole camera model is used for camera calibration and a new method of depth measurementThe average error of depth measurement measured by experiment (about 1.13 mm) was small in proportion

Keywords: Dual optical channels     Three dimensional     Camera calibration     Pinhole model     Depth measurement     Laparoscopic    

Computational fluid dynamics simulation of aerosol transport and deposition

Yingjie TANG, Bing GUO

Frontiers of Environmental Science & Engineering 2011, Volume 5, Issue 3,   Pages 362-377 doi: 10.1007/s11783-011-0365-8

Abstract: In this article computational fluid dynamics (CFD) simulation of aerosol transport and deposition, i.e. the transport and deposition of particles in an aerosol, is reviewed.The review gives a brief account of the basics of aerosol mechanics, followed by a description of theincluding CFD simulation of particle deposition in human respiratory tract and particle deposition in aerosolHowever, it is possible to take a balanced approach toward quantitative description of aerosol dispersion

Keywords: computational fluid dynamics (CFD)     aerosol     transport     deposition    

Calculation of collision frequency function for aerosol particles in free molecule regime in presence

Xiaowei LUO, Yannick BENICHOU, Suyuan YU

Frontiers in Energy 2013, Volume 7, Issue 4,   Pages 506-510 doi: 10.1007/s11708-013-0275-5

Abstract: The collision frequency function for aerosol particles has already been calculated for the free molecule

Keywords: aerosol particles     collision frequency function     coagulation    

Multivariable regression model for Fox depth correction factor

Ravi Kant MITTAL, Sanket RAWAT, Piyush BANSAL

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 1,   Pages 103-109 doi: 10.1007/s11709-018-0474-6

Abstract: This paper presents a simple and efficient equation for calculating the Fox depth correction factor usedClassical solution of Boussinesq theory was used originally to develop the Fox depth correction factoris straightforward, competent and easy to use for both manual and automated calculation of the Fox depthin the later part of the paper to analyse the extent of effect of a particular variable on the Fox depth

Keywords: settlement     embedment     Fox depth correction factor     regression     multivariable    

Aerosol exposure assessment during reclaimed water utilization in China and risk evaluation in case of

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 7, doi: 10.1007/s11783-021-1516-1

Abstract:

• The Chinese population exposure habits were surveyed.

Keywords: Legionella     QMRA     Reclaimed water     Aerosol     Water reuse    

Response of organic aerosol characteristics to emission reduction in Yangtze River Delta region

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 9, doi: 10.1007/s11783-023-1714-0

Abstract:

● The emission reduction causes significant change in organic aerosol

Keywords: Emission control     Secondary organic aerosol     Atmospheric oxidizing capacity     Holiday effects     COVID-19    

Formation of secondary inorganic aerosol in a frigid urban atmosphere

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 2, doi: 10.1007/s11783-021-1452-0

Abstract:

•Harbin showed relatively high threshold RH (80%) for apparent increase of SOR.

Keywords: Haze     Sulfate     Nitrate     Heterogeneous chemistry     Biomass burning     Northeast China    

Effects of two transition metal sulfate salts on secondary organic aerosol formation in toluene/NO

Biwu CHU, Jiming HAO, Junhua LI, Hideto TAKEKAWA, Kun WANG, Jingkun JIANG

Frontiers of Environmental Science & Engineering 2013, Volume 7, Issue 1,   Pages 1-9 doi: 10.1007/s11783-012-0476-x

Abstract: Aerosol phase reactions play a very important role on secondary organic aerosol (SOA) formation, andThese observations are consistent when varying metal sulfate aerosol concentrations.Their subsequent partitioning into the aerosol phase leads to the observed SOA formation enhancement.

Keywords: manganese sulfate     zinc sulfate     seed aerosols     toluene photooxidation     secondary organic aerosol    

How aerosol direct effects influence the source contributions to PM

Litao Wang, Joshua S. Fu, Wei Wei, Zhe Wei, Chenchen Meng, Simeng Ma, Jiandong Wang

Frontiers of Environmental Science & Engineering 2018, Volume 12, Issue 3, doi: 10.1007/s11783-018-1014-2

Abstract: The objective of this paper is to evaluate the impacts of aerosol direct effects on air quality overresolutions, respectively, for the period of January 2013, with two sets of simulations with or without aerosol-meteorologyWhen considering the aerosol feedbacks, the contributions of industrial and domestic sources assessedOur results imply that the aerosol direct effects should not be ignored during severe pollution episodes

Keywords: Aerosol direct effect     PM2.5     Southern Hebei     WRF/Chem     Haze    

Particle swarm optimization model to predict scour depth around a bridge pier

Shahaboddin SHAMSHIRBAND, Amir MOSAVI, Timon RABCZUK

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 4,   Pages 855-866 doi: 10.1007/s11709-020-0619-2

Abstract: Scour depth around bridge piers plays a vital role in the safety and stability of the bridges.The former approaches used in the prediction of scour depth are based on regression models or black boxdevelop new equations using particle swarm optimization as a metaheuristic approach to predict scour depthMoreover, the ratio of pier width to flow depth and ratio of 50 (mean particle diameter) to flow depthThe derived equations can be used as a suitable proxy to estimate scour depth in both experimental and

Keywords: scour depth     bridge design and construction     particle swarm optimization     computational mechanics     artificial    

Secondary aerosol formation in winter haze over the Beijing-Tianjin-Hebei Region, China

Dongjie Shang, Jianfei Peng, Song Guo, Zhijun Wu, Min Hu

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 2, doi: 10.1007/s11783-020-1326-x

Abstract: Abstract • Characteristics and interannual variation of aerosol pollution are illustrated. • Mechanismsof secondary aerosol formation in winter haze of North China are reviewed. • Directions in future studiesof secondary aerosol formation are provided.and secondary organics, in aerosol particles increase sharply, acting as the main contributors to aerosolThis paper reviews the research progress in aerosol chemistry during haze pollution episodes in the BTH

Keywords: Secondary aerosol formation     Regional haze     Photochemical reaction     Aqueous reaction     Chemical mechanism    

Title Author Date Type Operation

PM2.5 over North China based on MODIS AOD and effect of meteorological elements during 2003‒2015

Youfang Chen, Yimin Zhou, Xinyi Zhao

Journal Article

The Significant Contribution of Small-Sized and Spherical Aerosol Particles to the Decreasing Trend inTotal Aerosol Optical Depth over Land from 2003 to 2018

Ke Gui, Huizheng Che, Lei Li, Yu Zheng, Lei Zhang, Hujia Zhao, Junting Zhong, Wenrui Yao, Yuanxin Liang, Yaqiang Wang, Xiaoye Zhang

Journal Article

Investigating the raveling test for full-depth reclamation

Robert HILL, Andrew BRAHAM

Journal Article

Physical and chemical processes of wintertime secondary nitrate aerosol formation

Qi YING

Journal Article

Design and calibration of a new high-definition three-dimensional laparoscopic system

Jia TANG,Li-qiang WANG,Bo YUAN,Hong JIANG,Qi-ming ZHU

Journal Article

Computational fluid dynamics simulation of aerosol transport and deposition

Yingjie TANG, Bing GUO

Journal Article

Calculation of collision frequency function for aerosol particles in free molecule regime in presence

Xiaowei LUO, Yannick BENICHOU, Suyuan YU

Journal Article

Multivariable regression model for Fox depth correction factor

Ravi Kant MITTAL, Sanket RAWAT, Piyush BANSAL

Journal Article

Aerosol exposure assessment during reclaimed water utilization in China and risk evaluation in case of

Journal Article

Response of organic aerosol characteristics to emission reduction in Yangtze River Delta region

Journal Article

Formation of secondary inorganic aerosol in a frigid urban atmosphere

Journal Article

Effects of two transition metal sulfate salts on secondary organic aerosol formation in toluene/NO

Biwu CHU, Jiming HAO, Junhua LI, Hideto TAKEKAWA, Kun WANG, Jingkun JIANG

Journal Article

How aerosol direct effects influence the source contributions to PM

Litao Wang, Joshua S. Fu, Wei Wei, Zhe Wei, Chenchen Meng, Simeng Ma, Jiandong Wang

Journal Article

Particle swarm optimization model to predict scour depth around a bridge pier

Shahaboddin SHAMSHIRBAND, Amir MOSAVI, Timon RABCZUK

Journal Article

Secondary aerosol formation in winter haze over the Beijing-Tianjin-Hebei Region, China

Dongjie Shang, Jianfei Peng, Song Guo, Zhijun Wu, Min Hu

Journal Article