Light-absorption properties of brown carbon aerosols in the Asian outflow: Implications of a combination of filter and ground remote-sensing observations at Fukue Island, Japan
Light-absorption properties of brown carbon aerosols in the Asian outflow: Implications of a combination of filter and ground remote-sensing observations at Fukue Island, Japan
复制标题
亚洲外流中棕色碳气溶胶的光吸收特性：日本福江岛过滤器和地面遥感观测相结合的影响
DOI：
10.1016/j.scitotenv.2021.149155
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发表时间：
2021
影响因子：
9.8
通讯作者：
Kanaya Yugo
中科院分区：
文献类型：
--
作者：
Zhu Chunmao;Miyakawa Takuma;Irie Hitoshi;Choi Yongjoo;Taketani Fumikazu;Kanaya Yugo
棕碳气溶胶对地球辐射强迫具有重要的增温效应。然而，在亚洲流出区域的溴化碳气溶胶的光吸收特性的演变的信息是有限的。在这项研究中，我们使用2018年在日本西部的江岛制作的地基遥感网络SKYradiometer NETwork（SKYNET）的现场滤波器测量和天空辐射计观测来评估BrC的光吸收特性。从过滤器测量得到的BrC的光吸收系数的时间趋势类似的黑碳（BC）的环境浓度，表明BrC和BC有共同的燃烧源。由SKYNET观测得到的340-870 nm波长范围内的吸收Angstrom指数春季（1.81 ± 0.30）比全年（1.53 ± 0.50）高15%，表明亚洲外流将光吸收气溶胶带到了西太平洋和西太平洋。在消除BC的贡献后，从滤波器观测获得的单独BrC的吸收Angstrom指数与从SKYNET观测获得的吸收Angstrom指数具有正的斯皮尔曼相关性（rs= 0.77，p < 0.1），但值高出33%，表明使用这两种方法成功地捕获了BrC的光吸收特性。使用大气传输模型FLEXPART和从可见光红外成像辐射计套件产品获得的火灾热点，我们确定了一个高BrC事件，该事件与源自中国东部中部化石燃料燃烧和零星露天生物质燃烧地区的空气质量有关。研究结果有助于阐明东亚地区溴化碳气溶胶的动力学和气候效应。
Brown carbon (BrC) aerosols have important warming effects on Earth's radiative forcing. However, information on the evolution of the light-absorption properties of BrC aerosols in the Asian outflow region is limited. In this study, we evaluated the light-absorption properties of BrC using in-situ filter measurements and sky radiometer observations of the ground-based remote sensing network SKYradiometer NETwork (SKYNET) made on Fukue Island, western Japan in 2018. The light-absorption coefficient of BrC obtained from filter measurements had a temporal trend similar to that of the ambient concentration of black carbon (BC), indicating that BrC and BC have common combustion sources. The absorption Angstrom exponent in the wavelength range of 340–870 nm derived from the SKYNET observations was 15% higher in spring (1.81 ± 0.30) than through the whole year (1.53 ± 0.50), suggesting that the Asian outflow carries light-absorbing aerosols to Fukue Island and the western North Pacific. After eliminating the contributions of BC, the absorption Angstrom exponent of BrC alone obtained from filter observations had a positive Spearman correlation (rs= 0.77, p < 0.1) with that derived from SKYNET observations but 33% higher values, indicating that the light-absorption properties of BrC were successfully captured using the two methods. Using the atmospheric transport model FLEXPART and fire hotspots obtained from the Visible Infrared Imaging Radiometer Suite product, we identified a high-BrC event related to an air mass originating from regions with consistent fossil fuel combustion and sporadic open biomass burning in central East China. The results of the study may help to clarify the dynamics and climatic effects of BrC aerosols in East Asia.