【摘要】 觉华岛是辽东湾最大的岛屿，研究其污染物浓度分布特征以及潜在来源对于认识近海污染物传输效应具有较强的代表性意义。该研究于2020年10月1日至2021年6月30日期间在觉华岛怪石滩（120.78°E, 40.48°N）基于多轴差分吸收光谱技术（MAX-DOAS）对大气气溶胶、二氧化氮（NO₂）和二氧化硫（SO₂）垂直廓线开展了连续监测，具体分析了不同海拔高度上污染物浓度的季节变化特征及潜在来源。通过将地基MAX-DOAS观测结果和TROPOMI卫星数据结果进行对比，发现两者变化趋势具有良好的一致性，相关系数可达0.82。观测结果表明，觉华岛地区污染物浓度具有明显的季节变化特征，具体表现在秋冬季节NO₂和SO₂的平均浓度值分别为14.5×10¹⁵与16.6×10¹⁶ molec·cm^-2,比春夏季分别高出约84%和88%。NO₂和SO₂垂直廓线结果显示秋冬季污染物具有明显的垂直分布和日变化特征，具体表现为NO₂高浓度主要出现在10:00前及15:30—17:30间0～400 m的高度；SO₂高浓度主要出现在10:00前及16:00左右0～500 m的高度。气溶胶高值秋冬季主要出现在10:00前与16:00后400 m以下的高度，春夏季全天保持高浓度，尤其在11:00左右和17:00后。结合气团后向轨迹和潜在来源分析的方法判断NO₂与SO₂在秋冬季的高浓度值主要受到京津冀地区工业污染和机动车排放的传输贡献和辽东湾船舶排放的传输影响，而气溶胶大多来自山东半岛的生物质燃烧传输。结果表明，觉华岛地区的污染物浓度变化特征与大陆及周边海域污染物的传输作用密切相关。更多还原

【Abstract】 Juehua Island is the largest island in Liaodong Bay. Studying the distribution characteristics and potential sources of pollutants in Juehua Island has strong representative significance for studying the distribution characteristics and sources of pollutants in coastal areas. In this paper, the ground-based multi-axis differential optical absorption spectroscopy（MAX-DOAS） was performed continuously to observe the vertical profiles of aerosol, NO₂ and SO₂ on Juehua Island（120.78°E, 40.48°N） from October 2020 to June 2021. This study aims to learn the seasonal variation characteristics and potential sources of pollutant sat different altitudes. By comparing the ground-based MAX-DOAS and TROPOMI observations, we found that their variation trends are in good agreement, and the correlation coefficient is 0.82. The observation results show that the concentration of pollutants in Juehua Island has obvious seasonality characteristics. The averaged concentrations of NO₂ and SO₂ in autumn and winter are 14.5×10¹⁵ and 16.6×10¹⁶ molec·cm^-2, respectively, which are higher than those in spring and summer of 84% and 88%.The vertical profile results show that the pollutants have obvious vertical distribution and diurnal variation characteristicsin autumn and winter. The high concentrations of NO₂ mainly occurred before 10:00 and between 15:30 and 17:30 at the height layer of 0～400 m. The high concentrations of SO₂ mainly occurred before 10:00 and after 16:00 at a height layer of 0～500 m. The high AODs in autumn and winter mainly appeared at 400 meters before 10:00 and after 16:00 and maintained high concentrations throughout the whole day in spring and summer, especially around 11:00 and after 17:00. The airmassbackward trajectory combined with the potential source analysis method. It was used to learn that the higher concentrations of NO₂ and SO₂ in autumn and winter were mainly affected by regional transport from industrial and vehicle emissions in the Beijing-Tianjin-Hebei region and the ships emissions in the Liaodong Bay, and the aerosols mainly came from the biomass combustion transport of Shandong. Therefore, it can be concluded that the various characteristics of air pollutants in Juehua Island are closely related to regional transport.更多还原