Mass absorption cross-section and absorption enhancement from long term black and elemental carbon measurements: A rural background station in Central Europe.
Mass absorption cross-section and absorption enhancement from long term black and elemental carbon measurements: A rural background station in Central Europe.
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DOI：
10.1016/j.scitotenv.2021.148365
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发表时间：
2021-11-10
期刊：
影响因子：
--
通讯作者：
Holoubek I
中科院分区：
文献类型：
--
作者：
Mbengue S;Zikova N;Schwarz J;Vodička P;Šmejkalová AH;Holoubek I
黑碳（BC）是主要的气溶胶光吸收剂，其棕碳（BrC）涂层可以增强吸收并导致辐射强迫估计的不确定性。本研究调查了中欧农村地区长期现场测量（2013-2017）期间等效BC（MACeBC）的质量吸收截面。通过结合不同的方法来估计 MAC 增强因子 (Eabs) 和 BrC 涂层对吸收系数 (Babs) 的贡献。年平均 Babs 和 MACeBC 值在测量期间略有下降，与亚微米气溶胶粒径分布的变化相关。无论波长如何，Babs 都表现出明显的季节性和昼夜变化，由于当地生物质燃烧 (BB)，观察到较高的吸收 Ångström 指数 (1.4)，因此冬季的值较高。相比之下，MACeBC 在 600 nm 处没有明显的时间趋势（7.84 ± 2.79 m2 g−1），而在 370 nm 处表现出季节性趋势，冬季值较高（15.64 ± 4.77 m2 g−1）。在这个季节，尽管受到 BB 的影响，Eabs_660 为 1.18 ± 0.27，并且没有表现出任何明显的波长依赖性。在研究期间，在 31% 的样品中观察到 BrC 引起的吸收，占总 Bab 的贡献高达 40%。在夏季，Eabs_660 增加到 1.59 ± 0.60，这时二次气溶胶部分可以形成更大的 BC 涂层。在这个季节，MACeBC_660和Eabs_660显示了可比较的源剖面，主要与中欧上空的老化气团有关，从而支持了这样一个事实：大气老化过程中形成的涂层材料的特性是驱动在区域背景站点测量的MACeBC_660的主要因素。对BC涂层成分的进一步现场研究将有助于更好地理解和估计与气溶胶辐射效应相关的不确定性。在农村背景地点进行的 MACeBC 和 Eabs 的 5 年现场测量 用于估计 Eabs 和 BrC 涂层归因于吸收的不同方法 MACeBC 的时间趋势取决于与 Babs 相反的波长 BrC 涂层的贡献估计高达总吸收的 40% 由于夏季老化 PM 上相对较大的涂层，Eabs_660 增加
Black carbon (BC) is a dominant aerosol light absorber, and its brown carbon (BrC) coating can enhance absorption and lead to uncertainties concerning the radiative forcing estimation. This study investigates the mass absorption cross-section of equivalent BC (MACeBC) during a long-term field measurement (2013–2017) at a rural Central European site. The MAC enhancement factor (Eabs) and the contribution of BrC coatings to the absorption coefficient (Babs) were estimated by combining different approaches. The annual mean Babs and MACeBC values decreased slightly over the measurement period associated with change in the submicron aerosol size distribution. Regardless of the wavelength, Babs exhibited clear seasonal and diurnal variations, with higher values in winter when a higher absorption Ångström exponent (1.4) was observed due to the local biomass burning (BB). In contrast, MACeBC did not have a distinct temporal trend at 600 nm (7.84 ± 2.79 m2 g−1), while it showed a seasonal trend at 370 nm with higher values in winter (15.64 ± 4.77 m2 g−1). During this season, Eabs_660 was 1.18 ± 0.27 and did not exhibit any clear wavelength dependence, despite the influence of BB. During the study period, BrC-attributed absorption was observed in 31% of the samples, with a contribution of up to 40% of total Babs. In summer, the Eabs_660 increased to 1.59 ± 0.60, when a larger BC coating could be formed by secondary aerosol fractions. During this season, MACeBC_660 and Eabs_660 showed comparable source profiles that were mainly associated with aged air masses over central Europe, thereby supporting the fact that characteristics of coating materials formed during atmospheric aging are a major factor driving the MACeBC_660 measured at the regional background site. Further field investigations of the composition of BC coatings would help to better understand and estimate uncertainties related to the radiative effect of aerosols. 5-Years field measurement of MACeBC and Eabs conducted at a rural background site Different approaches used to estimate Eabs and BrC coatings attributed absorption Temporal trend of MACeBC depending on the wavelength contrarily to Babs Contribution of BrC coatings estimated up to 40% of the total absorption Increased Eabs_660 due to relatively larger coating on aged PM during summer
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影响因子：
5.2
作者：
Cabada, JC;Pandis, SN;Turpin, B
通讯作者：
Turpin, B
北京气溶胶中的棕碳和黑碳：棕色涂层对黑碳光吸收影响的影响
影响因子：
9.8
作者：
Cheng, Yuan;He, Ke-bin;Dong, Shu-ping
通讯作者：
Dong, Shu-ping
DOI：
10.1080/10962247.2018.1426653
发表时间：
2018-01-01
影响因子：
2.7
作者：
Chow, Judith C.;Watson, John G.;Gronstal, Steven B.
通讯作者：
Gronstal, Steven B.
影响因子：
9.8
作者：
Karanasiou, A.;Panteliadis, P.;Alastuey, A.
通讯作者：
Alastuey, A.
影响因子：
3.8
作者：
Cavalli, F.;Viana, M.;Putaud, J. -P.
通讯作者：
Putaud, J. -P.