上海市霾污染与长江口叶绿素a含量关系分析

Analysis of the Relationships Between Chlorophyll-a Concentration of Yangtze Estuary and Haze Pollution in Shanghai

近些年来霾污染日益严重,霾污染期间颗粒物浓度增加,在一定条件下颗粒物会通过干、湿沉降到海洋中,从而对海洋生态产生一定影响。为了探讨霾污染与海洋水环境中叶绿素a的关系,该研究通过对近1 a上海市10个环境监测站的PM2.5浓度和长江口43个监测站点叶绿素a浓度进行分析。结果表明,霾污染日叶绿素a平均浓度(2.52μg/L)高于非霾日(1.70μg/L)。霾日PM2.5浓度与叶绿素a浓度没有相关性(相关系数R2=0.048),轻度霾日和中度霾日叶绿素a浓度较高。对不同的霾周期分析可得,霾污染期间叶绿素a平均浓度与霾污染前相比,有所增加,主要表现在前期叶绿素a浓度减少,而后期叶绿素a浓度增加;霾消散后叶绿素a平均浓度与霾污染前相比则有所减少。由此推断,霾污染过程中海洋水环境中的叶绿素a浓度增加,但整个霾周期并不利于浮游植物的生长。

Haze pollution is becoming seriously in recent years. The increasing particulate concentration during the haze pollution, which settling to the ocean through dry and wet deposition, has a definite impact on the marine ecosystem. In order to explore the relationships between haze pollution and chlorophyll-a of marine water environment, PM2.5concentrations of 10 environment monitoring stations in Shanghai and chlorophyll-a concentrations of 43 monitoring sites in Yangtze Estuary were analyzed. The results showed that chlorophyll-a concentration in haze days(2.52 μg/L) was higher than non-haze days(1.70μg/L). PM2.5concentration during the haze days had no correlation with chlorophyll-a concentration(correlation coefficient R2=0.048) and chlorophyll-a concentration at mild and moderate haze days were relatively higher. The average concentrations of chlorophyll-a during haze pollution were increased compared with its concentrations before the haze pollution according to the analysis of different haze-cycles, mainly presenting as chlorophyll-a were decreased at the earlier period but at the later period chlorophyll-a were increased. After haze pollution, chlorophyll-a concentration was decreased compared with its concentration before the haze. Theoretically, chlorophyll-a concentration in the marine aquatic environment was increased during the haze, but the whole haze cycle is not conductive to the growth of phytoplankton.