地球化学
地毬化學
지구화학
GEOCHIMICA
2014年
2期
101-113
,共13页
朱晓华%杨永亮%盖楠%陈舒%李勇%焦杏春%史双昕%于寒青%谭科艳%潘静
硃曉華%楊永亮%蓋楠%陳舒%李勇%焦杏春%史雙昕%于寒青%譚科豔%潘靜
주효화%양영량%개남%진서%리용%초행춘%사쌍흔%우한청%담과염%반정
7Be%大气气溶胶%持久性有机污染物%东亚季风%北京
7Be%大氣氣溶膠%持久性有機汙染物%東亞季風%北京
7Be%대기기용효%지구성유궤오염물%동아계풍%북경
beryllium-7%aerosol%persistent organic pollutants%East Asia monsoon%Beijing
2009年8月至2010年7月在东亚季风区中纬度城市北京连续一年以每周3天的时间尺度同步采集近地面大气中气溶胶样品并测定了宇宙射线成因核素7Be 和8种有机氯农药(OCPs)、7种多氯联苯(PCBs)的浓度。7Be浓度全年平均值为(8.39±0.49) mBq/m3,显著高于欧洲地区具有相同纬度的城市。最高值出现在9月(15.64 mBq/m3),最低值出现在5月(1.35 mBq/m3)。夏季7Be浓度值较低,春、秋季浓度值较高。对大气气溶胶中7Be进行不同季风时节的比较要比季节性的比较可更好地揭示7Be的变化规律及其来源。夏季的低值与东南季风导致的多降雨气象条件有关。秋季的高值为大气环流异常所致。OCPs和PCBs总浓度(∑OCPs和∑PCBs)呈现夏季低,秋、冬季高的现象。西风和西北风为北京市大气气溶胶中POPs浓度最高的季风时节。较高氯代PCBs (PCB153和PCB180)在冬季占主导优势。较高的PCB101和PCB118可能来自北京周边的污染源。在部分时期7Be与DDTs和δ-HCH有显著的相关性,而在春季和夏季PCB-101与7Be有很好的相关性。
2009年8月至2010年7月在東亞季風區中緯度城市北京連續一年以每週3天的時間呎度同步採集近地麵大氣中氣溶膠樣品併測定瞭宇宙射線成因覈素7Be 和8種有機氯農藥(OCPs)、7種多氯聯苯(PCBs)的濃度。7Be濃度全年平均值為(8.39±0.49) mBq/m3,顯著高于歐洲地區具有相同緯度的城市。最高值齣現在9月(15.64 mBq/m3),最低值齣現在5月(1.35 mBq/m3)。夏季7Be濃度值較低,春、鞦季濃度值較高。對大氣氣溶膠中7Be進行不同季風時節的比較要比季節性的比較可更好地揭示7Be的變化規律及其來源。夏季的低值與東南季風導緻的多降雨氣象條件有關。鞦季的高值為大氣環流異常所緻。OCPs和PCBs總濃度(∑OCPs和∑PCBs)呈現夏季低,鞦、鼕季高的現象。西風和西北風為北京市大氣氣溶膠中POPs濃度最高的季風時節。較高氯代PCBs (PCB153和PCB180)在鼕季佔主導優勢。較高的PCB101和PCB118可能來自北京週邊的汙染源。在部分時期7Be與DDTs和δ-HCH有顯著的相關性,而在春季和夏季PCB-101與7Be有很好的相關性。
2009년8월지2010년7월재동아계풍구중위도성시북경련속일년이매주3천적시간척도동보채집근지면대기중기용효양품병측정료우주사선성인핵소7Be 화8충유궤록농약(OCPs)、7충다록련분(PCBs)적농도。7Be농도전년평균치위(8.39±0.49) mBq/m3,현저고우구주지구구유상동위도적성시。최고치출현재9월(15.64 mBq/m3),최저치출현재5월(1.35 mBq/m3)。하계7Be농도치교저,춘、추계농도치교고。대대기기용효중7Be진행불동계풍시절적비교요비계절성적비교가경호지게시7Be적변화규률급기래원。하계적저치여동남계풍도치적다강우기상조건유관。추계적고치위대기배류이상소치。OCPs화PCBs총농도(∑OCPs화∑PCBs)정현하계저,추、동계고적현상。서풍화서북풍위북경시대기기용효중POPs농도최고적계풍시절。교고록대PCBs (PCB153화PCB180)재동계점주도우세。교고적PCB101화PCB118가능래자북경주변적오염원。재부분시기7Be여DDTs화δ-HCH유현저적상관성,이재춘계화하계PCB-101여7Be유흔호적상관성。
Near-surface atmospheric aerosols were collected at sampling frequency of 3 d per week for one year from August 2009 to July 2010 in Beijing, which is located in the mid-latitude region of the East Asia monsoon region. The samples were analyzed for cosmogenic nuclide 7Be, eight organochlorine pesticides (OCPs), and seven polychlorinated biphenyls (PCBs). The annual average 7Be concentration was (8.39±0.49) mBq/m3, with variations of 1.35 to 15.64 mBq/m3, significantly higher than the average level in Europeancities at the same latitude. The maximum and minimum levels were observed in September and May, respectively. Autumn and spring were the seasons with high 7Be concentrations and summer and winter were the lower 7Be seasons. Comparisons of 7Be concentrations based on different monsoon phases can better reveal the variation patterns and source regions of 7Be than those based on seasonal comparisons. Enhannced wet precipitation may have caused lower 7Be oberseved in summer when southeasterly was prevailing. Higher 7Be concentrations in autumn than the annual mean is due to the abnormal atmospheric circulation in autumn 2009. Concentrations of HCHs, DDTs, PCBs followed a trend of being lower in summer and higher in autumn and winter, suggesting westerly and northwesterly can bring POPs residue to Beijing area. Higher chlorinated PCBs (PCB-153 and PCB-180) were predominant in winter. Higher PCB-101 and PCB-118 may have come from sourounding emission sources. Significant correlations were observed between the monthly average∑HCHs,∑DDTs, and∑PCBs and significant correlations of 7Be with DDTs andδ-HCH were found in some particular sampling periods.
