Influence of aerosol hygroscopicity and mixing state on aerosol optical properties in the Pearl River Delta region, China.
Influence of aerosol hygroscopicity and mixing state on aerosol optical properties in the Pearl River Delta region, China.
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珠三角地区气溶胶吸湿性和混合状态对气溶胶光学性质的影响
DOI：
10.1016/j.scitotenv.2018.01.199
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发表时间：
2018-06
影响因子：
9.8
通讯作者：
Chan P.
中科院分区：
文献类型：
--
作者：
Liu L.;Tan H.;Fan S.;Cai M.;Xu H.;Li F.;Chan P.
利用地面观测资料和Mie模式分析了气溶胶吸湿性和混合状态对气溶胶光学特性的影响。2014年2月22日至3月18日，在中国珠江三角洲地区，利用自制的吸湿串联微分迁移率分析仪（H-TDMA）和两台平行浊度计（PNEPs）分别测量了颗粒在相对湿度90%时的尺寸分辨吸湿增长因子（Gf（90%））和散射系数增强因子（f（RH）sp）。在观测期间，f（RH）sp随着相对湿度的增加（40%~ 85%）而沿着急剧增加，off（80%）sp为1.77 ± 0.18。所有颗粒的平均Gf（90%）分别为1.44（80 nm）、1.48（110 nm）、1.52（150 nm）和1.55（200 nm），而吸湿性较强的颗粒的平均Gf（90%）分别为1.58（80 nm）、1.63（110 nm）、1.66（150 nm）和1.67（200 nm）。基于Gf、PNSD和MBC，在3种气溶胶混合状态假设下，计算了气溶胶光学特性（消光（f（RH）ep）、散射（f（RH）sp）、后向散射（f（RH）hbsp）、吸收（f（RH）absp）和半球后向散射分数（f（RH）hbsp））的增强因子。结果表明，计算的df（80%）sp值与PNEPs测量值吻合较好，说明Gf粒径分布拟合是合理的。三种混合物的f（RH）ep、f（RH）spand f（RH）hbsp均随RH的增大而沿着增大，而f（RH）HBF则随RH的增大而减小。对于均匀的内部混合物，Thef（RH）absp增加，但对于外部混合物保持稳定。对于核-壳混合物，由于进入BC核的光的减少，f（RH）absp从RH = 0增加到75%，然后减小。对于外部混合状态，气溶胶直接辐射强迫的增强因子f（RH）Fr随RH的升高而急剧增大。而对于均匀内部混合物和核壳混合物，f（RH）Fr随RH的升高而沿着增大或减小，这取决于干燥条件下气溶胶直接辐射强迫的初始值。
Both the effects of aerosol hygroscopicity and mixing state on aerosol optical properties were analyzed using ground-based measurements and a Mie model in this study. The sized-resolved particle hygroscopic growth factor at RH = 90% (Gf(90%)) and the enhancement factor for the scattering coefficients (f(RH)sp) were measured by a self-constructed Hygroscopic Tandem Differential Mobility Analyzer (H-TDMA) and two nephelometers in parallel (PNEPs) respectively from 22nd February to 18th March 2014 in the Pearl River Delta, China. In addition, the particle number size distribution (PNSD) and BC mass concentration (MBC) were measured simultaneously.During the observation period, thef(RH)spincreased sharply along with increasing RH (40%–85%) and the value off(80%)spwas 1.77 ± 0.18. The meanGf(90%) for all particles are 1.44 (80 nm), 1.48 (110 nm), 1.52 (150 nm) and 1.55 (200 nm), and the meanGf(90%) for more-hygroscopic particles are 1.58 (80 nm), 1.63 (110 nm), 1.66 (150 nm) and 1.67 (200 nm) respectively. Based onGf, PNSD and MBC, the enhancement factor of the aerosol optical properties (extinction (f(RH)ep), scattering (f(RH)sp), backscattering (f(RH)hbsp), absorption (f(RH)absp), and hemispheric backscatter fraction (f(RH)hbsp)) were calculated under three aerosol mixing state assumptions. The results show that the calculatedf(80%)spvalues agreed well with the ones measured by PNEPs, illustrating that theGfsize distribution fittings are reasonable. Thef(RH)ep,f(RH)spandf(RH)hbspincreased along with increasing RH for three mixtures, whilef(RH)HBFdecreased. Thef(RH)abspincreased for the homogenously internal mixture, but remained stable for the external mixture. For the core-shell mixture, thef(RH)abspincreased from RH = 0 to 75% and then decreased, due to a decrease of light entering the BC core. The enhancement factor of aerosol direct radiative forcing (f(RH)Fr) increased sharply as the RH elevated for the external mixing state. However,f(RH)Frincreased or decreased along with the elevated RH for the homogenously internal mixture and the core-shell mixture depending on initial value of the aerosol direct radiative forcing (∆Fr) in a dry condition.
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影响因子：
10.4
作者：
van Donkelaar A;Martin RV;Brauer M;Kahn R;Levy R;Verduzco C;Villeneuve PJ
通讯作者：
Villeneuve PJ
DOI：
--
发表时间：
2009
期刊：
--
影响因子：
--
作者：
Deng Tao
通讯作者：
Deng Tao
光化学氧化对我国城市大气中黑碳混合状态和光吸收的影响
影响因子：
6.7
作者：
Wang Qiyuan;Huang Rujin;Zhao Zhuzi;Cao Junji;Ni Haiyan;Tie Xuexi;Zhu Chongshu;Shen Zhenxing;Wang Meng;Dai Wenting;Han Yongming;Zhang Ningning;Prevot Andre S. H.
通讯作者：
Prevot Andre S. H.
影响因子：
5
作者：
C. Sloane
通讯作者：
C. Sloane
珠江三角洲地区冬夏季气溶胶吸湿性和混合状态对比
影响因子：
5.5
作者：
Jiang Rongxin;Tan Haobo;Tang Lili;Cai Mingfu;Yin Yan;Li Fei;Liu Li;Xu Hanbing;Chan P. W.;Deng Xuejiao;Wu Dui
通讯作者：
Wu Dui