雾霾天对青岛PM2.5中铁、磷浓度及溶解度的影响  

Concentrations and Solubility of Iron and Phosphorus in PM2.5 in Hazy and Foggy Air at the Coastal City Qingdao of China

作　　者：管阳 石金辉[1,2] GUAN Yang;SHI Jin-Hui(Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China;Laboratory for Marine Ecology and Environmental Science, Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237, China)

机构地区：[1]中国海洋大学海洋环境与生态教育部重点实验室,山东青岛266100 [2]青岛海洋科学与技术试点国家实验室海洋生态与环境科学功能实验室,山东青岛266237

出　　处：《中国海洋大学学报（自然科学版）》2021年第4期117-125,共9页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(41876131);国家重点研究发展计划项目(2016YFC0200504)资助。

摘　　要：大气气溶胶中铁(Fe)和磷(P)溶解度决定了其沉降入海后对海洋初级生产及固碳能力的影响。本文分析了2017—2018年冬季在青岛采集的PM2.5样品中总态、溶解态Fe(Total Fe,TFe;Soluble Fe,SFe)和总态、溶解态P(Total P,TP;Soluble P,SP)浓度,讨论了雾、雾霾、霾和晴天对Fe和P浓度及溶解度的影响。平均而言,TFe浓度在雾天和雾霾天显著低于晴天,霾天则与晴天基本相当;SFe在雾天和雾霾天显著高于晴天,霾天也高于晴天,但二者无显著差异。Fe溶解度在雾天时最高,为16.8%,其次是雾霾天,平均为8.9%,霾天和晴天基本相当,为3.5%左右。TP与TFe和SP与SFe具有显著相关关系,其浓度变化趋势一致,但不同天气下P浓度的差异明显小于Fe。P溶解度在雾天和雾霾天约为80%,霾天时为45%,均显著高于晴天时的27%。PM2.5中Fe和P主要来自地壳源的贡献,未受人为活动影响时,Fe、P溶解度分别为1.5%~2%和16%~18%。大气酸化作用和相对湿度(Relative humidity,RH)的协同作用是不同天气条件下Fe、P溶解度产生差异的主要机制。霾天时气溶胶Fe、P溶解度明显低于雾霾天,其原因是霾天时低于60%的RH限制了大气酸化作用对溶解度的影响。The solubility of iron(Fe)and phosphorus(P)in atmospheric aerosols is an important factor to determine overall effects of atmospheric Fe and P deposited into surface seawater on marine primary productivity and oceanic carbon uptake.PM2.5 samples were collectedat the coastal city Qingdao of China from Nov.2017 to Jan.2018,in which the total Fe(TFe),soluble Fe(SFe),total P(TP)and soluble P(SP)were measured.The discrepancies of the concentrations and solubility of Fe and P in weather conditions of fog,fog-haze and haze with that inclear-weather condition were discussed.On average,the concentrations of TFe in fog and fog-haze aerosols were significantly lower than that in aerosols inclear days,while the concentration in haze aerosols was comparable to that in clear days.However,the concentrations of SFe in fog and fog-haze aerosols were significantly higher than in aerosols in clear days.Although the concentrations of SFe in haze aerosols was also higher than in aerosols in clear days,there was no significant difference between the two.The solubility of Fe was the highest in fog aerosols,with an average of 16.8%,followed by fog-haze aerosols with 8.9%,and the solubility in haze and aerosols was about 3.5%,basically equal with that in clear days.TP vs.TFe and SP vs.SFe had significant correlations,and thus they had a consistent change trends under different weather conditions,respectively,but the differences in P concentrations between different weather conditions were significantly smaller than those of Fe.The solubility of P was about 80%in fog and fog-haze aerosols,which wassignificantly higher than 27%in aerosols in clear days and 45%in haze aerosols.Fe and P in PM2.5were mainly derived from mineral dust sources.The initial solubility of Fe and P in aerosols without human interference was 1.5%~2%and 16%~18%,respectively.The synergistic effect of atmospheric acidification and relative humidity(RH)was the main mechanism for the differences in Fe and P solubility under different weather conditions.RH below 60%in haze

关 键 词：铁 磷 溶解度 雾 霾 PM2.5 大气酸化过程 相对湿度 

分 类 号：X513[环境科学与工程—环境工程]