Brown carbon in atmospheric outflow from the Indo-Gangetic Plain: Mass absorption efficiency and temporal variability
Brown carbon in atmospheric outflow from the Indo-Gangetic Plain: Mass absorption efficiency and temporal variability
复制标题
DOI：
10.1016/j.atmosenv.2014.03.030
复制
发表时间：
2014-06
影响因子：
5
通讯作者：
B. Srinivas;M. Sarin
中科院分区：
文献类型：
--
作者：
B. Srinivas;M. Sarin
棕色碳 (BrC) 和元素碳 (EC) 的同步测量是在环境气溶胶 (PM2.5) 中进行的，这些气溶胶是 2009 年 11 月至 2010 年 3 月期间从印度东北部的一个地点收集的，代表从印度恒河平原 (IGP) 到孟加拉湾 (BoB) 的大气流出量。 BrC (babs) 的吸收系数在 365 nm 处通过水溶性有机碳 (WSOC) 进行评估，变化范围为 2 至 21 M m−1，并且与 WSOC 浓度 (3–29 µg m−3) 呈现显着的线性关系 (P< 0.05)。埃指数（α：8.3±2.6，其中babs≈λ−α。）与生物质燃烧排放（BBE）中的腐殖质类物质（HULIS）的报道一致。 BBE 的影响也可以从 nss-K+/EC (0.2–1.4) 和 OC/EC (3.4–11.5) 的质量比中看出。 PM2.5 中 WSOC 的质量分数 (10–23%) 和 BrC 的质量吸收效率 (σabs-BrC: 0.5–1.2 m2g−1) 使人们关注棕碳在印度恒河平原上空人为气溶胶造成的大气辐射强迫中的重要性。
The simultaneous measurements of brown carbon (BrC) and elemental carbon (EC) are made in ambient aerosols (PM2.5), collected from a site in north-east India during November'09–March'10, representing the atmospheric outflow from the Indo-Gangetic Plain (IGP) to the Bay of Bengal (BoB). The absorption coefficient of BrC (babs), assessed from water-soluble organic carbon (WSOC) at 365 nm, varies from 2 to 21 M m−1and exhibits significant linear relationship (P< 0.05) with WSOC concentration (3–29 μg m−3). The angstrom exponent (α: 8.3 ± 2.6, wherebabs≈λ−α.) is consistent with that reported for humic-like substances (HULIS) from biomass burning emissions (BBE). The impact of BBE is also discernible from mass ratios of nss-K+/EC (0.2–1.4) and OC/EC (3.4–11.5). The mass fraction of WSOC (10–23%) in PM2.5and mass absorption efficiency of BrC (σabs-BrC: 0.5–1.2 m2g−1) bring to focus the significance of brown carbon in atmospheric radiative forcing due to anthropogenic aerosols over the Indo-Gangetic Plain.