| 黄渤海气溶胶中砷的分布特征和季节变化 |
| 摘要点击 2055 全文点击 622 投稿时间：2021-02-16 修订日期：2021-03-08 |
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| 中文关键词 黄渤海 总砷 季节变化 后向轨迹 干沉降通量 |
| 英文关键词 Yellow Sea and Bohai Sea total arsenic seasonal variations backward trajectory dry deposition flux |
| 作者 | 单位 | E-mail | | 袁帅 | 中国海洋大学环境科学与工程学院, 青岛 266100
中国海洋大学海洋环境与生态教育部重点实验室, 青岛 266100 | 540178718@qq.com | | 王艳 | 中国海洋大学环境科学与工程学院, 青岛 266100
中国海洋大学海洋环境与生态教育部重点实验室, 青岛 266100 | | | 刘汝海 | 中国海洋大学环境科学与工程学院, 青岛 266100
中国海洋大学海洋环境与生态教育部重点实验室, 青岛 266100 | ruhai@ouc.edu.cn | | 种习习 | 中国海洋大学环境科学与工程学院, 青岛 266100
中国海洋大学海洋环境与生态教育部重点实验室, 青岛 266100 | | | 刘晓雨 | 中国海洋大学环境科学与工程学院, 青岛 266100
中国海洋大学海洋环境与生态教育部重点实验室, 青岛 266100 | | | 邵龙 | 中国海洋大学环境科学与工程学院, 青岛 266100
中国海洋大学海洋环境与生态教育部重点实验室, 青岛 266100 | |
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| 中文摘要 |
| 于2017~2018年冬、春和夏季，在黄渤海海域走航采样，采集总悬浮颗粒物（TSP）样品，分析总砷（As）、As （Ⅴ）、As （Ⅲ）以及水溶性离子，讨论了As在黄渤海气溶胶中浓度、空间分布以及季节变化，估算了As的干沉降通量.气溶胶中As含量冬季（6.6 ng·m-3） > 夏季（5.5 ng·m-3） > 春季（4.4 ng·m-3），渤海和北黄海远大于南黄海.冬、夏季As（Ⅲ）/As（Ⅴ）比值分别为0.41和0.21.冬、春和夏季As/TSP平均值分别为95.4、83.9和81.4 μg·g-1，冬季明显高于春季和夏季.冬季在冬季风主导下，携带了环渤海地区排放的污染物导致砷含量最高，夏季受东南季风携带的东部沿海地区污染物的影响也较大，而春季受西伯利亚陆地气团和东南远海海洋性气团的共同影响，浓度最小.冬季K+/TSP与As/TSP存在显著正相关（r=0.78，P<0.05），说明受陆地生物质燃烧排放的As的影响明显，而夏季两者相关性不显著，说明来源不同.冬、春和夏季黄渤海大气气溶胶As的干沉降通量分别为1.15、0.77和0.97 μg·（m2·d）-1，年平均为0.95 μg·（m2·d）-1. |
| 英文摘要 |
| Marine aerosol samples of total suspended particulates (TSP) were collected in winter (2017) and spring and summer (2018) over the Yellow Sea and Bohai Sea. These samples were analyzed for total arsenic (As), As(Ⅴ) and As(Ⅲ), and water soluble ions to investigate the distribution and seasonal variation of As in atmospheric aerosols, as well as the dry deposition flux. Results showed that As concentrations in winter, spring, and summer were 6.6, 5.5, and 4.4 ng·m-3, respectively. The highest As concentrations occurred in the winter. Obvious differences in the spatial distribution of As were observed in different seasons. The highest concentrations of As were observed over the Bohai Sea in winter and the northern Yellow Sea in spring, with an average of 8.8 and 11.3 ng·m-3, respectively. As concentrations exhibited a relatively uniform spatial pattern in summer over the Yellow Sea and Bohai Sea, which may have been affected by the different sources of As. As(Ⅴ) was the main species of As, while As(Ⅴ)/As(Ⅲ) ratios were 0.41 in winter and 0.21 in summer, respectively. Average As/TSP ratios in the winter, spring, and autumn were 95.4, 83.9, and 81.4 μg·g-1, respectively. Obviously higher As/TSP ratios, indicating higher intensity, occurred in winter. Air masses carry pollutants released over the Bohai Rim Region by the winter monsoon, resulting in higher As concentrations in winter. In summer, As concentrations are also higher, because air masses bring pollutants to the southeast coastal economic zone via the northeast monsoon. In spring, most air masses arriving in this region originate from Siberia and the southeast ocean with high rate, resulting in lower As concentrations. The significant correlation between K+/TSP and As/TSP (r=0.78, P<0.05) in winter indicates that As is affected by the combustion of land biomass. No significant correlation in summer reveals the difference in As sources between winter and summer. The dry deposition flux of As over the Yellow Sea and Bohai Sea was 1.15 μg·(m2·d)-1 in winter, 0.77 μg·(m2·d)-1 in spring, and 0.97 μg·(m2·d)-1 in summer, with an annual mean value of 0.95 μg·(m2·d)-1. |
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