| 2006~2020年中国大气本底站BC气溶胶的时空分布特征 |
| 摘要点击 5169 全文点击 610 投稿时间：2021-11-11 修订日期：2021-12-19 |
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| 中文关键词 黑碳(BC) 气溶胶光学厚度(AOD) 时空分布 气溶胶 大气本底站 |
| 英文关键词 black carbon (BC) aerosol optical depth (AOD) temporal and spatial variations aerosol atmospheric background station |
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| 中文摘要 |
| 黑碳（BC）气溶胶来源复杂且具有特殊环境和气象影响效应.我国不同大气环境下的BC时空分布特征亟待全面认识.使用2006~2020年中国7个大气本底站长期BC观测数据，结合气象数据、排放源、增强植被指数（EVI）和气溶胶光学厚度（AOD）数据，综合分析了BC的时空分布特征、长期演化趋势及其影响因素.结果表明，中国不同地区的BC浓度和AOD差异较大，BC对AOD多为正贡献.受排放源和气象条件等因素的影响，BC浓度和AOD空间分布为东高西低，"胡焕庸线"以东的龙凤山、上甸子、临安和金沙的浓度较高，ρ（BC）和AOD平均值分别为（1699±2213）~（3392±2131） ng·m-3和0.36±0.32~0.72±0.37；"胡焕庸线"以西的阿克达拉、瓦里关和香格里拉的浓度较低，ρ（BC）和AOD平均值分别为（287±226）~（398±308） ng·m-3和0.20±0.13~0.22±0.19.不同大气本底站BC的年际变化可分为4类：年际变化较小型，主要为阿克达拉站；先增后减然后稳定型，主要为瓦里关站；先降低后稳定类，主要为香格里拉站；先稳定后降低型，主要为龙凤山、上甸子、金沙和临安.不同大气本底站BC的季节变化具有差异."胡焕庸线"以西地区秋季BC浓度最低，冬季和春季BC浓度较高；"胡焕庸线"以东地区冬季BC浓度最高，夏季BC浓度最低.BC对AOD的影响在"胡焕庸线"东西部站点的春季和夏季均较大，在"胡焕庸线"以西站点的秋季较小，在"胡焕庸线"以东站点的冬季较小.大气本底站BC的日变化多为双峰型分布，但是峰值时间存在显著地区和季节差异. |
| 英文摘要 |
| Black carbon (BC) aerosol emissions are complex and have important environmental and meteorological effects. In China, the temporal and spatial variations in BC in different atmospheric environmental conditions need to be fully understood. Based on the long-term observational BC data in seven atmospheric background stations in China from 2006 to 2020, combined with meteorological data, emission source data, enhanced vegetation index (EVI) data, and aerosol optical depth (AOD) data, we comprehensively analyzed the characteristics of temporal and spatial variations, long-term evolution, and influencing factors of BC in China. The results showed that the BC and AOD values of different atmospheric environments in China were quite different, and BC positively contributed to AOD. The spatial distribution was high in the east and low in the west owing to the differences in emission sources and meteorological conditions. The ρ(BC) and AOD values were higher to the east of the "Hu Huanyong" line, such as at the Mt. Longfeng, Shangdianzi, Lin'an, and Jinsha stations, where the average values were (1699±2213)-(3392±2131) ng·m-3 and 0.36±0.32-0.72±0.37, respectively. These values were lower to the west of the "Hu Huanyong" line, such as at the Akedala, Mt. Waliguan, and Shangri-La stations, where the average values were (287±226)-(398±308) ng·m-3 and 0.20±0.13-0.22±0.19, respectively. The interannual variability in BC included differences between different atmospheric background stations, which could be divided into four categories:low interannual variability, such as at the Akedala station; an initial increase followed by a decrease and subsequent stabilization, such as at the Mt. Waliguan station; an initial decrease followed by stabilization, such as at the Shangri-La station; and an initial stabilization followed by a decrease, such as at the Mt. Longfeng, Shangdianzi, Jinsha, and Lin'an stations. Seasonal variations in BC included differences in different atmospheric background stations. The BC mass concentrations were lowest in autumn and higher in winter and spring west of the "Hu Huanyong" line and were highest in winter and lowest in summer east of the "Hu Huanyong" line. BC contributed to the AOD being larger in all stations in the spring and summer and contributed less at the stations west of the "Hu Huanyong" line in autumn and the stations east of the "Hu Huanyong" line in winter. The diurnal variations in BC were mainly bimodally distributed in the different atmospheric background stations, but the peak times varied in different stations and seasons. |
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