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THE RELATION OF ACOUSTICAL COAGULATION OF aerosol PARTICLES TO SOUND FIELD PARAMETERS

Chinese Science Bulletin 1986年第13期31卷 874-877页

作者：王耀俊魏荣爵 Acoustics Institute Nanjing University

It is usually very important to choose an adequate frequency of sound wave to coagulate aerosol particles *** early as 1930’s Brandt et al. derived an approximate formula for calculating the optimum frequency of acou... 详细信息

关键词： aerosol coagulation calculating approximate RELATION adequate choose 蓝甲卫协 impedance

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Diurnal Variation of Atmospheric aerosol Particles in the Phyllostachys heterocycla Forest in Spring

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Journal of Landscape Research 2019年第5期11卷 116-118,122页

作者： WANG Qian WANG Cheng REN Binbin XU Chao GUO Junqi ZHANG Zhongxia Beijing Institute of Landscape Architecture Beijing 100102China Research Institute of Forestry Chinese Academy of ForestryBeijing 100091China Key Laboratory of Forest Cultivation State Forestry AdministrationBeijing 100091China Urban Forest Research Center State Forestry AdministrationBeijing 100091China Neiqiu Forestry Bureau XingtaiHebei 054200China

Taking the Phyllostachys heterocycla forest in Qishan National Forest Park of Fuzhou for example,this study observed the diurnal variation of atmospheric aerosol particles in the forest in the growing *** results showed that:① The diurnal variation curves of the particle concentration of the forest and the forest edge had “two peaks and two troughs”,but the peaks and troughs of the forest edge were advanced or *** concentrations of the particles in the forest and at the forest edge had two peaks at 11:00–13:00 and 17:00–19:00 and two troughs at 7:00–9:00 and 15:00–17:00.② For the forest and the forest edge,the diurnal variation trends of the particles of different particle sizes were generally similar,except that the peaks and troughs of fine particles were slightly earlier or lagging than that of coarse particles.③ The concentrations of the particles were positively correlated with temperature,humidity and light,and negatively correlated with wind speed,and the concentrations of the particles at the forest edge were significantly negatively correlated with wind speed.

关键词： Phyllostachys heterocycla Growing season Atmospheric aerosol particle Diurnal variation

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Particle size measurement system of the aerosol Time-Of-Flight Mass Spectrometer optimization study

Particle size measurement system of the Aerosol Time-Of-Flig...

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2007亚洲光电子会议光学设计与测试分会场

作者： Wen-wu Zhao* Xue-jun Gu Li-qing Hao Ming-qiang Huang Hai-yang Zheng Li Fang Wei-jun Zhang Key Laboratory of Environmental Optics and Technology of Anhui Institute of Optics and Fine Mechanics CAS Hefei 230031 China

In this paper, aerosol time-of-flight mass spectrometer optical particle size measurement system optimization and influencing factors are studied. Optimized the distance between nozzle and the skimmer, using a shorter wavelength light source measurement, aerosol particle size measurement from the previous limit of 260 nm to 120 nm. Study found that the particles scattered light intensity is connected with light intensity and wavelength of the light source. particle size measurements using shorter laser wavelengths or greater energy, which can measure smaller size diameter within certain range. combining particle beam focusing aerodynamic lens system device, the particle size of air the time-resolved measurement of 256 / min, Measurement of time-resolved mass spectrometry to 170 / min, MS hit rate of 64.5%.

关键词： aerosol optical particle size measurement Time-of-Flight Mass Spectrometry Mass Spectra Peak

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Modeling Study of aerosol Indirect Effects on Climate with an AGCM-aerosol Coupled System

Modeling Study of Aerosol Indirect Effects on Climate with a...

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第七届亚洲气溶胶会议

作者： Zhili Wang1, Hua Zhang2, Zaizhi Wang2, Xiaoye Zhang1 and Sunling Gong11 Chinese Academy of Meteorological Sciences, No. 46 Zhongguancun Nandajie Haidian District, Beijing, China, 100081 2 National Climate Center, China Meteorological Administration, No. 46 Zhongguancun Nandajie Haidian District, Beijing, China, 100081

aerosol indirect effects (AIEs) on global climate are quantitatively investigated by introducing aerosol-cloud interaction parameterizations for stratus clouds into an AGCM (BCCGCM2.0.1) developed by the National Climate Center of the China Meteorological Administration coupling with the Canadian aerosol Module (CAM). The study yields a global annual mean of -1.57 W m-2 for the first indirect radiative forcing. The second indirect effect leads to global annual mean changes in net shortwave flux of -0.58 W m-2 at the top of the atmosphere (TOA). The total AIE reduces the global annual means of net shortwave flux at the TOA and of surface temperature by 2.27 W m-2 and 0.12 K, respectively. Change in surface temperature induced by the total AIE is clearly larger in the Northern Hemisphere (-0.21 K) than in the Southern Hemisphere, where changes are negligible. The interhemispheric asymmetry in surface cooling results in significant differences in changes of the interhemispheric annual mean precipitation rate, which could lead to a tendency for the ITCZ to weaken and broaden. In summer, the northeasterly or northerly flows in most areas of east and south China and over the nearby oceans are enhanced due to the total AIE, which weakens the transport of warm and moist air carried by the East Asian summer monsoon, and decreases the summer monsoon precipitation in east and south China.

关键词： aerosol cloud radiation indirect effects

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A Numerical Scheme of Secondary aerosol Formation from Photochemical Reaction

A Numerical Scheme of Secondary Aerosol Formation from Photo...

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中国颗粒学会2006年年会暨海峡两岸颗粒技术研讨会

作者： Wang-Kun Chen, Ping Wang (Department of Environmental Management, Jin-Wen University, Taipei, China Department of Civil Engineering, Chin-Yuan University, Chungli, China)

＜正＞Formation of secondary aerosols from photochemical reaction was studied in this paper. As a part of this study, four basic modules of photochemical reaction were used for calculation. The secondary aerosols including the C4H8, RCOx, ALD, PAN and CH3NO2 were simulated by the Runge-Kutta numerical analysis scheme. The results of the numerical analysis demonstrate the variation of secondary aerosol concentration during the photochemical reaction process. It is also useful for the establishing of an aerosol prediction model for the air quality management.

关键词： aerosol photochemical reaction numerical model

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Mixing State of Particles by Single Particle aerosol Mass Spectrometer in Urban Area of PRD

Mixing State of Particles by Single Particle Aerosol Mass Sp...

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第七届亚洲气溶胶会议

作者： Xinhui Bi 1, Guohua Zhang1, Lei Li 2, Xinming Wang 1, Guoying Sheng 1, Jiamo Fu 1, 2 and Zhen Zhou2 1 State Key Laboratory of Organic Geochemistry, Guangdong Province Key Laboratory of Utilization and Protection of Environmental Resource, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, P.R. China 2 School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, P. R. China

Single particle aerosol mass spectrometer (SPAMS) was used to characterize the single particle size and chemical composition of submicron aerosols in the urban area of the Pearl River Delta (PRD) region, China, for the period April 30 through May 22, 2010. This is the first study for the mixing state of aerosols by direct observation in this region. 696,465 particles were sized and chemical analyzed with both positive and negative ion spectra, in which 141,338 biomass burning particles were identified representing a significant source of submicron particles ～20.3% by numbe, and carbonaceous particles accounted for as much as 5% of submicron particles by number. Up to 98% carbonaceous particles were found to internally mix with secondary inorganic species. Carbonaceous particles were clustered into three distinct particle groups, comprised of organic carbon (OC), elemental carbon (EC) and the mixture of both (OCEC). The OC specie was the most abundant, with concentrations of 43%. EC and OCEC followed with 32% and 25%, respectively. Nitrate and ammonium traces between particle groups had negligible variance, while sulfate was found to prefer to associate with OC and OCEC rather than EC. The influence of aerodynamic diameter was substantial for mixing states with nitrate and ammonium, with ratios lower in the condensation mode than droplet mode;whereas sulfate mixing ratios were nearly constant within 0.2-1.2 μm. Biomass burning particles were clustered into six distinct particle groups, comprising of Ca-rich, Na-rich, organic carbon (OC), elemental carbon (EC), the mixture of OC and EC (OCEC) and Secondary. OC was the largest contributor with a fraction of 22.9%, followed by Secondary type (21.4%) and OCEC (19.0%). Na-rich type was observed in 11.9% of the particles and 90% internally mixed with EC. The fraction of nitrate in biomass burning particles was higher 10% than in carbonaceous particles, which could be explained by the fact that the rich sodium and potassium

关键词： Biomass burning carbonaceous aerosol mixing state single particle nitrate sulfate SPAMS ATOFMS aerosol PRD.

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Application of the Polarization-Raman-Mie Lidar in Automatic and Continuous Observation of aerosol and Cloud

Application of the Polarization-Raman-Mie Lidar in Automatic...

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第七届亚洲气溶胶会议

作者： Chenbo Xie Bangxin Wang Fudi Qi Zhiqing Zhong Zhenzhu Wang Guangyu Bo and Dong Liu Key Laboratory of Atmospheric Composition and Optical Radiation Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences P.O. box 1125 Hefei Anhui 230031 China

The Polarization-Raman-Mie Lidar （PRML） developed for Chinese Academy of Meteorological Sciences is introduced. The PRML lidar have the three detection channels for detecting the Raman scattering signal, the parallel and perpendicular polarization signals of aerosol and cloud, simultaneously. The use of Raman scattering is a well established method to determine the vertical profile of the aerosol and cloud extinction and backscatter coefficients independently, resulting in a dramatic reduction to the associated uncertainties than the traditional Mie scattering lidar observation. Another advantage of Raman scattering detection is to provide the lidar ratio of aerosol and cloud, which is an important parameter for characterizing microphysical properties of them. The parallel and perpendicular polarization signals are useful indicator of nonspehricity for identifying ice clouds and dust layers. For convenience, the PRML lidar is specially designed to be a compact, turn-key and unattended one-box instrument that are rugged, run from a standard AC power outlet. No specialist knowledge is required for installation and maintenance and the software provides real-time data processing. The PRML lidar can be operated in a continuous mode through a window on the roof of the observation room, regardless of weather. It’s very useful to monitor the spatial and temporal properties of aerosols and clouds.

关键词： Polarization Lidar Raman Lidar aerosol Cloud

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Detection and Analysis of aerosol Micro-physics Properties Using Multi-wavelength Polarization Lidar

Detection and Analysis of Aerosol Micro-physics Properties U...

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第十八届中国科协年会——分12大气雾霾及PM2.5...

作者： Huige DI Dengxin HUA Hangbo HUA Yan CUI School of Mechanical and Precision Instrument Engineering Xi’an University of Technology

Lidar is a powerful tool for remotely studying temporal and spatial variations of aerosol in atmosphere. Mie-scattering lidar which measures the total backscattered laser light from the atmosphere is used worldwidely for studying aerosol optical properties. The aerosol backscatter optical property is uniquely determined according to the physical and chemical properties of the aerosols(their size, shape, and complex refractive index) and the laser wavelength, and the wavelength dependence of the backscatter and extinction coefficient is mainly dependent on the aerosol size distribution and refractive index. The micro physical characteristics of aerosol can be retrieved according to multi-wavelength optical signals. The retrieval method of aerosol microphysical character was developed based on the concept of Tikhonov’s regularization. A multi-wavelength polarization lidar was built at the Lidar Center for Atmosphere Remote Sensing, in Xi’an, China to study the vertical distribution of the optical and microphysical properties of aerosols. And the atmosphere observations were carried out in January 2015. An smog event was studied and analysed in detail. Using inversion with regularization, we retrieved the vertical distribution of aerosol microphysical properties, including volume size distribution, volume concentration, number concentration and effective radius. We also used the Hybrid Single Particle Lagrangian Integrated Trajectory(HYSPLIT) model to analyse aerosol sources during the episode. In the case of severe smog, we found a large number of spherical and fine particles concentrated in the very low troposphere, even below 0.5 km. Surprisingly, a dust layer with a slight depolarization ratio was observed above the smog layer.

关键词： aerosol multi-wavelength lidar haze polarization

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INVESTIGATION OF THE aerosol OPTICAL THICKNESS ON OCEAN SURFACE BY SATELLITE REMOTE SENSING

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Chinese Science Bulletin 1987年第17期32卷 1183-1187页

作者：赵柏林俞小鼎 Department of Geophysics peking University

The atmospheric aerosol content can be used to assess the atmospheric environment. Using satellite remote sensing to monitor the atmospheric aerosol is a realizable method. In this note, an NOAA-7 AVHRR radiometer (visible) has been used to measure the aerosol optical thickness on Bohai Bay in the clear sky from the brightness image of visible band. The thickness is in proportion to the amount of atmospheric aerosol.

关键词： aerosol radiometer SURFACE Bohai NOAA brightness AVHRR radiative visible monitor

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Different Response of Sea Surface Temperature in the North Pacific to Greenhouse Gas and aerosol Forcing

Different Response of Sea Surface Temperature in the North P...

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第32届中国气象学会年会

作者： WANG Liyi LIU Qinyu Physical Oceanography Laboratory/Qingdao Collaborative Innovation Center of Marine Science and Technology Ocean University of China

The responses of Sea Surface Temperature(SST) to greenhouse gas(GHG) and anthropogenic aerosol in the North Pacific are compared based on the historical and single-forcing simulations with Geophysical Fluid Dynamics Laboratory Climate Model version 3(GFDL CM3). During 1860-2005, the GHG(aerosol) effect causes SST to warming(cooling) in the North Pacific, and they show some similarity and difference from each other. Specifically, it is found that this aerosol cooling effect exceeds the GHG warming effect in the Kuroshio/Oyashio Extension(KOE) region during 1950-2004 in the CM3 single forcing. It is simply because the responses to aerosol forcing consist of enhanced Aleutian Low, accelerated westerly of middle latitude and increased ocean sub-polar Gyre, which help increasing cold advection effect in the KOE region. Besides, the positive feedback effect between cold SST and cloud can also strengthen the aerosol cooling effect in the KOE region during the boreal summer, when the mixed layer depth is shallow. However, as response to GHG forcing, the increased subtropical Gyre and its warm advection effect are limited only in the Kuroshio Extension recirculation area and the maximum SST warming lies on the region north of 45°N during 1950-2004. Consequently, the SST responses to all forcing in the historical simulation are similar to the responses to aerosol forcing in sign and spatial pattern, and the aerosol effect is quite important to SST cooling in the mid-latitude North Pacific during the past 55 years.

关键词： North Pacific Sea Surface Temperature response greenhouse gas aerosol

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