|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Black carbon aerosols and their radiative properties in the Pearl River Delta region显示文摘The climatic and environmental effects of atmospheric aerosols are a hot topic in global science community, and radiative properties of the aerosols are one of the important parameters in assessing climatic change. Here we studied the black carbon concentration and absorption coefficient measured with aethalometers, scattering coefficient measured with nephelometers, and single scattering albedo derived at an atmospheric composition watch station in Guangzhou from 2004 to 2007. Our main results are as follows. The data of black carbon concentration and absorption coefficients measured with instruments cannot be directly used until they are measured in parallel with internationally accepted instruments for comparison, calibration, and reduction. After evaluation of the data, the result shows that the monthly mean of BC concentration varies 3.1―14.8 μg·m-3 and the concentration decreases by about 1 μg·m-3 in average over the four years; It is higher in the dry season with a multi-year mean of 8.9 μg/m3 and lower in the rainy season with a multi-year mean of 8.0 μg·m-3; The extreme maximum of monthly mean concentration occurred in December 2004 and extreme minimum in July 2007, and a 4-year mean is 8.4 μg·m-3. It is also shown that monthly mean scattering coefficient derived varies 129 -565 Mm-1, monthly mean absorption coefficient 32-139 Mm-1, and monthly mean single scattering albedo 0.71-0.91, with annual mean values of 0.80, 0.82, 0.79 and 0.84 for 2004, 2005, 2006 and 2007, respectively. Three instruments were used to take simultaneous measurements of BC in PM10, PM2.5, and PM1 and the results showed that PM2.5 took up about 90% of PM10 and PM1 accounted for about 68% of PM2.5, and BC aerosols are mainly present in fine particulates. The variability of BC concentrations is quite consistent between the Nancun station (141 m above sea level) and the Panyu station (13 m above sea level), which are 8 km apart from each other. The concentration in higher altitude station (Panyu) is consistently lower than the lower altitude station (Nancun), and the difference of annual mean is about 4 μg·m-3. | WU Dui MAO JieTai DENG XueJiao TIE XueXi ZHANG YuanHang ZENG LiMin LI Fei TAN HaoBo BI XueYan HUANG XiaoYing CHEN Jing DENG Tao | 2009 | Science China Earth Sciences2009，52，8： | 58 |
| 2 | Aerosol scattering coefficients and major chemical compositions of fine particles observed at a rural site in the central Pearl River Delta,South China显示文摘During November-December 2010 aerosol scattering coefficients were monitored using a single-waved (525 nm) Nephelometer at a regional monitoring station in the central Pearl River Delta region and 24-hr fine particle (PM 2.5) samples were also collected during the period using quartz filters for the analysis of major chemical components including organic carbon (OC),elemental carbon (EC),sulfate,nitrate and ammonium.In average,these five components accounted for about 85% of PM 2.5 mass and contributed 42% (OC),19% (SO 4 2 -),12% (NO 3 -),8.4% (NH 4+) and 3.7% (EC),to PM 2.5 mass.A relatively higher mass scattering efficiency of 5.3 m 2/g was obtained for fine particles based on the linear regression between scattering coefficients and PM 2.5 mass concentrations.Chemical extinction budget based on IMPROVE approach revealed that ammonium sulfate,particulate organic matter,ammonium nitrate and EC in average contributed about 32%,28%,20% and 6% to the light extinction coefficients,respectively. | Xinming Wang Xiang Ding Xiaoxin Fu Quanfu He Shaoyi Wang Francois Bernard Xiuying Zhao Dui Wu | 2012 | Journal of Environmental Sciences2012，24，1： | 25 |
| 3 | Effect of atmospheric aerosol on surface ozone variation over the Pearl River Delta region显示文摘Our analysis of the surface aerosol and ultraviolet(UV) measurements in Pearl River Delta(PRD) region shows that the sur-face UV radiation is reduced by more than 50% due to high aerosol concentrations.This has important impacts on urban eco-system and photochemistry,especially on ozone photochemical production over the region.The quantitative effect of aerosols on surface ozone is evaluated by analyzing surface observations(including ozone,ultraviolet radiation,aerosol radiative pa-rameters) and by using radiative and chemical models.A case study shows that the aerosol concentrations and UV radiation are significantly correlated with ozone concentrations.The correlation coefficient between the aerosol optical depth(AOD) and the PM10 mass concentration is very high,with a maximum of 0.98,and the AOD and UV radiation/ozone is anti-correlated,with a correlation coefficient of -0.90.The analysis suggests that ozone productivity is significantly decreased due to the reduction of UV radiation.The noon-time ozone maximum is considerably depressed when AOD is 0.6,and is further decreased when AOD is up to 1.2 due to the reduction of ozone photochemical productivity.Because the occurring probability of aerosol optical depth for AOD550 nm≥0.6 and AOD340 nm≥1.0 is 47,and 55% respectively during the dry season(October,November,December,January),this heavy aerosol condition explains the low ozone maximum that often occurs in the dry season over the Guangzhou region.The analysis also suggests that the value of single scattering albedo(SSA) is very sensitive to the aerosol radiative effect when the radiative and chemical models are applied,implying that the value of SSA needs to be carefully studied when the models are used in calculating ozone production. | DENG XueJiao ZHOU XiuJi WU Dui TIE XueXi TAN HaoBo LI Fei BI XueYan DENG Tao JIANG DeHai | 2011 | Science China Earth Sciences2011，54，5： | 10 |
| 4 | A vertical sounding of severe haze process in Guangzhou area显示文摘We detected a severe haze process in Guangzhou area with lidar and microwave radiometer, performed an inversion to get boundary layer height by wavelet covariance transform, and analyzed the correlation between meteorological factors of boundary layer and visibility from the perspective of dynamical and thermodynamic structures. Our results indicate that the boundary layer height shows significant daily changes, consistent with ground visibility variation. During the cleaning process, the boundary layer height exceeded 1 km; during severe haze, the height was only 500 m. Temperature gradient of 50–100 m, which was 30 h lag, was remarkably correlated with visibility, with the correlation coefficient of 0.77. High layer visibility(255 m) and low layer stability were significantly anticorrelation, and the maximum anticorrelation coefficient was up to-0.76 in cleaning days and-0.49 in haze days. In the related boundary layer meteorological factors, surface ventilation coefficient was linearly correlated with ground visibility, with the greatest correlation coefficient of 0.88. The correlation coefficients of boundary layer height, ground wind velocity, relative humidity and ground visibility were 0.76, 0.67, and-0.77, respectively. There was a strong correlation between different meteorological factors. The dominant meteorological factor during this haze process was surface ventilation coefficient. In the area without boundary layer height sounding, ground visibility and wind velocity could be used to estimate boundary layer height. | DENG Tao WU Dui DENG XueJiao TAN HaoBo LI Fei LIAO BiTing | 2014 | Science China Earth Sciences2014，57，11： | 10 |
| 5 | Compositions and sources of organic acids in fine particles(PM_(2.5)) over the Pearl River Delta region, south China显示文摘Organic acids as important constituents of organic aerosols not only influence the aerosols' hygroscopic property, but also enhance the formation of new particles and secondary organic aerosols. This study reported organic acids including C14–C32fatty acids, C4–C9dicarboxylic acids and aromatic acids in PM2.5collected during winter 2009 at six typical urban, suburban and rural sites in the Pearl River Delta region. Averaged concentrations of C14–C32fatty acids, aromatic acids and C4– C9 dicarboxylic acids were 157, 72.5 and 50.7 ng/m3, respectively. They totally accounted for 1.7% of measured organic carbon. C20–C32fatty acids mainly deriving from higher plant wax showed the highest concentration at the upwind rural site with more vegetation around, while C14–C18fatty acids were more abundant at urban and suburban sites, and dicarboxylic acids and aromatic acids except 1,4-phthalic acid peaked at the downwind rural site. Succinic and azelaic acid were the most abundant among C4–C9dicarboxylic acids, and 1,2-phthalic and 1,4-phthalic acid were dominant aromatic acids. Dicarboxylic acids and aromatic acids exhibited significant mutual correlations except for 1,4-phthalic acid, which was probably primarily emitted from combustion of solid wastes containing polyethylene terephthalate plastics. Spatial patterns and correlations with typical source tracers suggested that C14–C32fatty acids were mainly primary while dicarboxylic and aromatic acids were largely secondary. Principal component analysis resolved six sources including biomass burning, natural higher plant wax, two mixed anthropogenic and two secondary sources; further multiple linear regression revealed their contributions to individual organic acids. It turned out that more than 70% of C14–C18fatty acids were attributed to anthropogenic sources, about 50%–85% of the C20–C32fatty acids were attributed to natural sources, 80%–95% of dicarboxylic acids and 1,2-phthalic acid were secondary in contrast with that 81% of 1,4-phthalic acid was primary. | Xiuying Zhao Xinming Wang Xiang Ding Quanfu He Zhou Zhang Tengyu Liu Xiaoxin Fu Bo Gao Yunpeng Wang Yanli Zhang Xuejiao Deng Dui Wu | 2014 | Journal of Environmental Sciences2014，26，1： | 6 |
| 6 | Attenuation of ultraviolet radiation reaching the surface due to atmospheric aerosols in Guangzhou显示文摘The UV attenuation due to atmospheric aerosols in Guangzhou was quantitatively assessed using surface ultraviolet radiation (UV,295-385 nm) observation,sun photometer and radiation models.Observations showed that the annual average value of aerosol optical depth (AOD) was 1.19 in UV spectral region of 340 nm,the annual average occurrence frequency of aerosol optical depth AOD 340 nm >1.0 was 55%,and the annual average attenuation rate of surface UV direct radiation of 340 nm was 68%.It was proven in the observation of surface UV radiation and model evaluation that annual average attenuation of UV due to atmosphere was 75%,and that reached 72% in the dry season (October,November,December and January);while average attenuation of UV due to atmospheric aerosols reached 62% in the dry season.It was indicated that very significant UV attenuations due to atmospheric aerosols existed in Guangzhou urban agglomeration,and at least half of UV radiation was attenuated due to atmospheric aerosols.Such large-amplitude attenuation will have a significant impact on urban ecosystem and species chemical cycles,especially photochemical reaction processes. | DENG XueJiao ZHOU XiuJi TIE XueXi WU Dui LI Fei TAN HaoBo DENG Tao | 2012 | Chinese Science Bulletin2012，57，21： | 6 |
| 7 | SCF^SImb E3 ligase-mediated degradation of Expanded is inhibited by the Hippo pathway in Drosophila显示文摘 | Hongtao Zhang Changqing Li Hanqing Chen Chuanxian Wei Fei Dai Honggang Wu Wen Dui Wu-Min Deng Renjie Jiao | 2015 | Cell Research2015，25，1： | 3 |
| 8 | An extremely low visibility event over the Guangzhou region: A case study显示文摘 | Dui Wu Xuexi Tie Chengcai Li Zhuming Ying Alexis Kai-Hon Lau Jian Huang Xuejiao Deng Xueyan Bi | 2005 | Atmospheric Environment2005，，35： | 2 |
| 9 | Implications of changing urban and rural emissions on non-methane hydrocarbons in the Pearl River Delta region of China显示文摘 | J.H. Tang L.Y. Chan C.Y. Chan Y.S. Li C.C. Chang X.M. Wang S.C. Zou Barbara Barletta D.R. Blake Dui Wu | 2008 | Atmospheric Environment2008，，16： | 2 |
| 10 | Lung cancer mortality and exposure to atmospheric aerosol particles in Guangzhou, China显示文摘 | Xuexi Tie Dui Wu Guy Brasseur | 2009 | Atmospheric Environment2009，，14： | 2 |
| 11 | Lung Cancer Mortality and Exposure to Atmospheric Aerosol Particles in Guangzhou China 显示文摘 | Tie Xuexi Wu Dui Brasseur G | 2009 | Atmospheric Environment2009，43，14： | 1 |
| 12 | Lung cancer mortality and exposure to atmospheric aerosol particles in Guangzhou, China 显示文摘 | TIE Xuexi WU Dui BRASSEUR G | 2009 | Atmos Environ2009，43，14： | 1 |
| 13 | An extremely low visibility event over the Guangzhou region: A case study 显示文摘 | Wu Dui Tie Xuexi Li Chengcai | 2005 | Atmospheric Environment2005，39，35： | 1 |
| 14 | Long term trend of visibility and its characterizations in the Pearl River Delta(PRD) Region, China显示文摘 | DENG Xuejiao TIE Xuexi WU Dui | 2008 | Atmos Environ2008，42，7： | 1 |
| 15 | Lung cancer mortality and exposure to atmospheric aerosol particles in Guangzhou, China显示文摘 | Xuexi Tie Dui Wu Guy Brasseur | 2009 | Atmospheric Environment2009，43，14： | 1 |
| 16 | Lung cancer mortality and exposure to atmospheric aerosol particles in Guangzhou, China显示文摘 | Xuexi Tie Dui Wu Guy Brasseur | 2009 | Atmospheric Environment2009，，14： | 1 |
| 17 | Long-term Trend of Visibility and Its Characterizations in the Pearl River Delta Region (PRD), China 显示文摘 | DENG Xue-jiao TIE Xue-xi WU Dui | 2007 | Atmospheric Environment2007，42，7： | 1 |
| 18 | An extremely low visibility event over the Guangzhou region: A case study显示文摘 | WU Dui TIE Xuexi LI Chengcai | 2005 | Atmospheric Environment2005，39，35： | 1 |
| 19 | An extremely low visibility event over the Guangzhou region:A case study显示文摘 | WU Dui TIE Xuexi LI Chengcai | 2005 | Atmospheric Environment2005，39，35： | 1 |
| 20 | Long-term trend of visibility and its characterizations in the Pearl River Delta (PRD) region, China显示文摘 | Xuejiao Deng Xuexi Tie Dui Wu Xiuji Zhou Xueyan Bi Hanbo Tan Fei Li Chenglin Jiang | 2007 | Atmospheric Environment2007，，7： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员