In situ vertical characteristics of optical properties and heating rates of aerosol over Beijing
In situ vertical characteristics of optical properties and heating rates of aerosol over Beijing
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北京上空气溶胶光学性质和加热速率的现场垂直特征
DOI：
10.5194/acp-20-2603-2020
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发表时间：
2019-09
影响因子：
6.3
通讯作者：
Ding Deping
中科院分区：
文献类型：
--
作者：
Tian Ping;Liu Dantong（通讯）;Zhao Delong;Yu Chenjie;Liu Quan;Huang Mengyu;Deng Zhaoze;Ran Liang;Wu Yunfei;Ding Shuo;Hu Kang;Zhao Gang;Zhao Chunsheng;Ding Deping
表征气溶胶光学特性的垂直剖面很重要，因为仅依靠表面或柱积分测量不能明确地约束气溶胶的辐射影响。本文研究了2016年11 - 12月北京地区三次污染事件中气溶胶多波长光学特性的垂直分布。在所有污染事件中，污染初始化前的清洁期（CPs）具有较高的散射埃指数（SAE）和较小的不对称参数(g)，且垂直结构相对均匀。重污染期（HPs）颗粒尺寸增大，导致这些参数的变化方向相反。在过渡时期（TPs），发现了高海拔地区老化气溶胶的区域输送。气溶胶机器人网络（AERONET）气溶胶光学深度（AOD）与现场测量值的匹配度在10%以内；然而，AERONET的吸收光深度（AAOD）比原位测量值高10% -20%，在较短波长的情况下，这一正差异增加到30%。通过增加吸收埃氏指数（AAE）识别棕碳（BrC）的吸收，通过计算光谱吸收系数和辐射传递模型计算的光化通量估算黑碳（BC）和BrC的升温速率。污染期间，BC和BrC在行星边界层（PBL）的升温速率分别高达0.18和0.05Kh（-1）。从CP到HP， PBL中BrC的吸收比例从12%增加到40%。值得注意的是，在污染条件下，在PBL以上发现了更高的BrC加热贡献。本研究描绘了碳质气溶胶在污染事件不同阶段的短波加热影响的全貌，并强调了污染期间BrC吸收的增加贡献，特别是在高海拔地区。
Characterizing vertical profiles of aerosol optical properties is important because relying on only the surface or column-integrated measurements cannot unambiguously constrain the radiative impacts of aerosol. This study presents series of vertical profiles of in situ measured multi-wavelength optical properties of aerosols during three pollution events from November to December 2016 over the Beijing region. For all pollution events, the clean periods (CPs) before pollution initialization showed a higher scattering Angstrom exponent (SAE) and a smaller asymmetry parameter (g) with relatively uniform vertical structures. The heavy pollution periods (HPs) showed an increased particle size, causing these parameters to vary in the opposite way. During the transition periods (TPs), regional transport of aged aerosols at higher altitudes was found. The Aerosol Robotic Network (AERONET) aerosol optical depth (AOD) matched the in situ measurements within 10 %; however the AERONET absorption optical depth (AAOD) was 10 %-20% higher than the in situ measurements, and this positive discrepancy increased to 30% at shorter wavelengths. The absorption of brown carbon (BrC) was identified by the increased-absorption Angstrom exponent (AAE), and the heating rate of black carbon (BC) and BrC was estimated by computing the spectral absorption coefficient and actinic flux calculated by a radiative transfer model. BC and BrC had a heating rate of up to 0.18 and 0.05Kh(-1) in the planetary boundary layer (PBL), respectively, during the pollution period. The fraction of BrC absorption increased from 12% to 40% in the PBL from the CP to the HP. Notably, a higher contribution of BrC heating was found above the PBL under polluted conditions. This study paints a full picture of shortwave heating impacts of carbonaceous aerosols during different stages of pollution events and highlights the increased contribution of BrC absorption especially at higher altitudes during pollution.
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冬季雾霾期间北京城区黑碳气溶胶粒径分布及来源
影响因子：
6.3
作者：
Wu Yunfei;Wang Xiaojia;Tao Jun;Huang Rujin;Tian Ping;Cao Junji;Zhang Leiming;Ho Kin-Fai;Han Zhiwei;Zhang Renjian
通讯作者：
Zhang Renjian
DOI：
10.5194/acp-2018-1104
发表时间：
2018-12
期刊：
--
影响因子：
--
作者：
K. Klingmüller;J. Lelieveld;V. Karydis;G. Stenchikov
通讯作者：
K. Klingmüller;J. Lelieveld;V. Karydis;G. Stenchikov
影响因子：
5
作者：
K. Updyke;Tran B. Nguyen;S. Nizkorodov
通讯作者：
K. Updyke;Tran B. Nguyen;S. Nizkorodov
DOI：
10.1073/pnas.1525746113
发表时间：
2016-10
期刊：
Proceedings of the National Academy of Sciences
影响因子：
--
作者：
E. Wilcox;Rick M. Thomas;P. S. Praveen;K. Pistone;F. Bender;V. Ramanathan
通讯作者：
E. Wilcox;Rick M. Thomas;P. S. Praveen;K. Pistone;F. Bender;V. Ramanathan
影响因子：
5
作者：
P. Tian;Dantong Liu;Mengyu Huang;QUAN LIU;Delong Zhao;L. Ran;Z. Deng;Yunfei Wu;S. Fu;
通讯作者：
P. Tian;Dantong Liu;Mengyu Huang;QUAN LIU;Delong Zhao;L. Ran;Z. Deng;Yunfei Wu;S. Fu;