Column-integrated aerosol optical properties and direct radiative forcing based on sun photometer measurements at a semi-arid rural site in Northeast China
Column-integrated aerosol optical properties and direct radiative forcing based on sun photometer measurements at a semi-arid rural site in Northeast China
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中国东北半干旱农村地区基于太阳光度计测量的柱积分气溶胶光学特性和直接辐射强迫
DOI：
10.1016/j.atmosres.2015.01.021
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发表时间：
2015-04
影响因子：
5.5
通讯作者：
Zhang, Renjian
中科院分区：
文献类型：
--
作者：
Zhu, Jun;Che, Huizheng;Xia, Xiangao;Zhang, Renjian
地面和卫星遥感测量结果显示，在中国的重气溶胶负荷，然而，气溶胶光学特性和直接辐射强迫在中国东北地区-气候模拟和遥感的重要-没有得到广泛的研究。为了更好地了解气溶胶柱积分光学特性和直接辐射强迫，我们在中国东北典型的半干旱地区通榆进行了4年的连续太阳光度计观测。500 nm处的气溶胶光学厚度（AOD）年平均值为0.20 ± 0.26; 440 - 870 nm处的朗斯特伦指数（AE）为1.37 ± 0.64; 440 nm处的单次散射散射系数（SSA）为0.91 ± 0.05。在这个农村站点的AOD是在污染的华北平原和长江三角洲地区观察到的四分之一。人为的精细模式粒子是占主导地位的贡献者。气溶胶光学厚度和气溶胶发射率的季节变化规律基本相反。夏季（0.26 ± 0.27）和春季（0.24 ± 0.30）较高的气溶胶光学厚度值可能与夏季来自南方工业区的人为气溶胶的远距离输送以及春季沙尘事件的贡献增加有关。最小的AOD（0.16 ± 0.22）与最大的AE（1.75 ± 0.76）同时出现，观察到在冬季。平均而言，在440 nm处的吸收AOD（AAOD）和在440和870 nm之间的吸收朗斯特伦指数（AAE）分别为0.06 ± 0.03和1.04 ± 0.43。在秋季和冬季，平均AAE显著高于1，表明生物质燃烧产生的棕色碳对气溶胶的吸收贡献很大。夏季和春季AAE均小于1，与黑碳颗粒的覆盖有关。在大气底部估计有较大的负气溶胶直接辐射强迫，在大气顶部估计的数值相对较低;平均值分别为− 26.28和− 9.42 W m− 2。这导致地表强烈的冷却效应，但大气变暖，可能影响区域气候。
Ground and satellite remote sensing measurements have revealed heavy aerosol loading in China; however, aerosol optical properties and direct radiative forcing in Northeast China – important in climate modeling and remote sensing – have not been widely studied. We studied four years of continuous sun photometer measurements at Tongyu, a typical semi-arid rural site in Northeast China, to better understand column-integrated aerosol optical properties and direct radiative forcing. The annual average aerosol optical depth (AOD) at 500 nm was 0.20 ± 0.26; the Ångström exponent (AE) between 440 and 870 nm was 1.37 ± 0.64; and the single scattering albedo (SSA) at 440 nm was 0.91 ± 0.05. The AOD at this rural site was a quarter of that observed in the polluted North China Plain and Yangtze River Delta regions. Anthropogenic fine-mode particles were the dominant contributor to AOD. The AOD and AE showed generally opposite seasonal variation patterns. Relatively higher AOD values in summer (0.26 ± 0.27) and spring (0.24 ± 0.30) were likely related to long-range transportation of anthropogenic aerosols from southern industrial regions in summer, and the increased contribution of dust events in spring. The minimum AOD (0.16 ± 0.22) was concurrent with the maximum AE (1.75 ± 0.76), observed in winter. On average, the absorption AOD (AAOD) at 440 nm and its absorption Ångström exponent (AAE) between 440 and 870 nm were 0.06 ± 0.03 and 1.04 ± 0.43, respectively. The mean AAE was considerably higher than 1 in autumn and winter, indicating that brown carbon from biomass burning contributed greatly to aerosol absorption. The AAE was lower than 1 in summer and spring, related to the coating of black carbon particles. Large negative aerosol direct radiative forcing was estimated at the bottom of the atmosphere, with relatively lower values estimated at the top of the atmosphere; the means were − 26.28 and − 9.42 W m− 2, respectively. This resulted in a strong cooling effect on the surface, but warming in the atmosphere, potentially impacting the regional climate.
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