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Accurate Measurement of Raman depolarization ratio in Gaseous CO2

Chinese Journal of Chemical Physics 2015年第1期28卷 17-20,I0001页

作者：靳玉娟喻远琴王钰熙林珂周晓国刘世林安徽大学物理与材料科学学院合肥230039 中国科学技术大学合肥微尺度物质科学国家实验室、化学物理合肥230026

The Raman depolarization ratios of gaseous CO2 in the spectral range of 1240-1430 cm-I are determined with a sensitive photoacoustic Raman spectroscopy, and more accurate data compared to the literature results are presented. The precision of the obtained depolarization ratio is achieved by measuring and fitting the dependence of the PARS signal intensity on the cross angle between the polarizations of two incident laser beams.

关键词： depolarization ratio Accurate measurement Photoacoustic Raman spec-troscopy Global fitting

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Lockdown-induced Urban Aerosol Change over Changchun, China During COVID-19 Outbreak with Polarization LiDAR

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Chinese Geographical Science 2022年第5期32卷 824-833页

作者： CHEN Weiwei DUANMU Lingjian QIN Yang YANG Hongwu FU Jing LU Chengwei FENG Wei GUO Li Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and AgroecologyChinese Academy of Sci-encesChangchun 130102China College of Biological and Agricultural Engineering Jilin UniversityChangchun 130022China Jilin Provincial Ecological Environment Monitoring Center Changchun 130012China Hongke Photonics Company Liaoyuan 136200China The Department of Ophthalmology The First Hospital of Jilin UniversityChangchun 130021China Key Lab of Groundwater Resources and Environment Jilin UniversityChangchun 130021China

Depending on various government policies,COVID-19(Corona Virus Disease-19) lockdowns have had diverse impacts on global aerosol *** 2022,Changchun a provincial capital city in Northeast China,suffered a severe COVID-19 outbreak and implemented a very strict lockdown that lasted for nearly two *** ground-based polarization Light Detection and Ranging(LiDAR),we detected real-time aerosol profile parameters(EC,extinction coefficient;DR,depolarization ratio;AOD,aerosol optical depth),as well as air-quality and meteorological indexes from 1 March to 30 April in 2021 and 2022 to quantify the effects of lockdown on aerosol *** period in 2022 was divided into three stages:pre-lockdown(1-10 March),strict lockdown(11 March to 10 April),and partial lockdown(11-30 April).The results showed that,during the strict lockdown period,compared with the pre-lockdown period,there were substantial reductions in aerosol parameters(EC and AOD),and this was consistent with the concentrations of the atmospheric pollutants PM_(2.5)(particulate matter with an aerodynamic diameter ≤2.5 μm) and PM_(2.5)(particulate matter with an aerodynamic diameter ≤10 μm),and the Oconcentration increased by 8.3%.During the strict lockdown,the values of EC within0-1 km and AOD decreased by 16.0% and 11.2%,respectively,as compared to the corresponding period in *** reduced the conventional and organized emissions of air pollutants,and it clearly delayed the time of seasonal emissions from agricultural burning;however,it did not decrease the number of farmland fire *** meteorological factors and eliminating the influence of wind-blown dust events,the results showed that reductions from conventional organized emission sources during the strict lockdown contributed to a 30% air-quality improvement and a 22% reduction in near-surface extinction(0-2 km).Aerosols produced by urban epidemic prevention and disinfection can also be identified using the ***

关键词： PM_(2.5)(particulate matter with an aerodynamic diameter≤2.5μm) NO2 O3 aerosol optical depth(AOD) extinction coefficient depolarization ratio COVID-19(Corona Virus Disease-19)lockdown

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Retrieval of the Single Scattering Albedo of Asian Dust Mixed with Pollutants Using Lidar Observations

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Advances in Atmospheric Sciences 2014年第6期31卷 1417-1426页

作者： Sungkyun SHIN Young Min NOH Kwonho LEE Hanlim LEE Detlef MLLER Y.J.KIM Kwanchul KIM Dongho SHIN School of Environmental Science and Engineering Gwangju Institute of Science and TechnologyKorea Department of Geoinformatics Engineering Kyungil UniversityKorea Department of Spatial Information Engineering Pukyong National UniversityKorea Science System and Applications Inc. NASA Langley Research CenterUSA University of Hertfordshire United Kingdom

The vertical distribution of single scattering albedos （SSAs） of Asian dust mixed with pollutants was derived using the multi-wavelength Raman lidar observation system at Gwangju （35.10°N,126.53°E）.Vertical profiles of both backscatter and extinction coefficients for dust and non-dust aerosols were extracted from a mixed Asian dust plume using the depolarization ratio from lidar *** profiles of backscatter and extinction coefficients of non-dust particles were input into an inversion algorithm to retrieve the SSAs of non-dust *** aerosol layers at different heights had different light-absorbing *** SSAs of non-dust particles at each height varied with aerosol type,which was either urban/industrial pollutants from China transported over long distances at high altitude,or regional/local pollutants from the Korean *** advantage of independent profiles of SSAs of non-dust particles,vertical profiles of SSAs of Asian dust mixed with pollutants were estimated for the first time,with a new approach suggested in this study using an empirical determination of the SSA of pure *** SSAs of the Asian dust-pollutants mixture within the planetary boundary layer （PBL） were in the range 0.88-0.91,while the values above the PBL were in the range 0.76-0.87,with a very low mean value of 0.76 ± *** total mixed dust plume SSAs in each aerosol layer were integrated over height for comparison with results from the Aerosol Robotics Network （AERONET） *** of SSA retrieved from lidar observations of 0.92 ± 0.01 were in good agreement with the results from AERONET measurements.

关键词： lidar Asian dust depolarization ratio microphysical properties single scattering albedo

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