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首页> 外文期刊>Journal of Geophysical Research, D. Atmospheres: JGR >Year-round optical properties and source characterization of Arctic organic carbon aerosols on the North Slope Alaska
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Year-round optical properties and source characterization of Arctic organic carbon aerosols on the North Slope Alaska

机译：北坡阿拉斯加北坡北极有机碳气溶胶的全年光学性质及源表征

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Long-term data on organic aerosol concentration and optical properties are needed in the Arctic to improve characterization of radiative forcing by atmospheric aerosols. This study presents the seasonal trends (summer 2012 to summer 2013) of organic carbon (OC) and water-soluble organic carbon (WSOC) along with optical properties of light-absorbing OC from a yearlong sampling campaign in Utqia?vik, AK. Ambient OC concentrations for the year range from 0.008 ± 0.002 μgm~(-3) to 0.95 ± 0.06 μgm~(-3) with peaks in late summer, early fall, and late winter. On average, WSOC accounted for 57 ± 11% of the total OC burden throughout the sampling campaign, which is consistent with previous WSOC values. In order to understand the potential radiative impacts of light-absorbing OC, the light absorption properties of WSOC were determined. Seasonal averaging revealed that the highest average mass absorption efficiency value of 1.54 ± 0.75 m~2 g~(-1) was in the fall, with an annual range of 0.70 ± 0.44 to 1.54 ± 0.75 m~2 g~(-1). To quantify the contributions of fossil and contemporary carbon sources to OC, radiocarbon abundance measurements were performed. For OC, fossil contributions were the greatest for select samples in the fall at 61.4 ± 9.8%, with contemporary contributions dominating OC in the spring and summer (68.9 ± 9.8% and 64.8 ± 9.8%, respectively). Back trajectories identified five major source regions to Utqia?vik throughout the year, with a marine influence from the Arctic Ocean potentially present in all seasons. All these results point to impact from primary and secondary sources of OC in the Arctic.
机译：在北极中需要有机气溶胶浓度和光学性质的长期数据，以改善大气气溶胶辐射强制辐射的表征。本研究提出了季节性趋势（2012年夏季至2013年夏季）有机碳（OC）和水溶性有机碳（WSOC）以及来自UTQIA的一岁的抽样活动的光吸收OC的光学性质？VIK，AK。环境OC浓度为0.008±0.002μgm〜（-3）至0.95±0.06μgm〜（-3），夏季晚期，早秋和深冬季。平均而言，WSOC占整个采样活动中的OC负担总量的57±11％，这与以前的WSOC值一致。为了理解光吸收OC的潜在辐射冲击，测定了WSOC的光吸收性能。季节性平均揭示了最高平均质量吸收效率1.54±0.75 m〜2g〜（-1）的秋季，年范围为0.70±0.44至1.54±0.75 m〜2 g〜（-1） 。为了量化化石和当代碳源对OC的贡献，进行了无线电金的测量。对于OC，化石贡献最为伟大的选择样本在61.4±9.8％，当代贡献在春季和夏季主导OC（分别为68.9±9.8％和64.8±9.8％）。后轨迹在全年内确定了五个主要的源区？Vik，北极海洋潜在的海洋影响可能存在于所有季节。所有这些结果都指出了北极中OC的初级和二次来源的影响。

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