北京冬季PM10中有机碳与元素碳的高分辨率观测及来源分析.pdfVIP

北京冬季PM 0中有机碳与元素碳的 高分辨率观测及来源分析 张仁健，石 磊，刘 阳 f中国科学院大气物理研究所东亚区域气候环境重点实验室，北京 100029) 摘 要：运用先进的RP5400碳颗粒物连续分析仪和TEOM1400a气 5．1)，(30．2_+20．4)，(172．6~98．3) g·m。and2．3~0．9，respectively．OC， 溶胶质量测量仪于2004年冬季对北京大气PM10及碳气溶胶进行了 EC．and total carbon(TC=OC+EC)account for(12．4±6．4)％，(5．6± 连续观测，得到了PMl0、有机碳(OC)、无机碳(EC)和总碳(TC)的日变 2．3)％，and(18±9．2)％ofPM10，respectively．The variation concentra。 化特征。观测期间OC、EC、TC、PM．0的浓度和 OC／EC比值分别为 tio n of OC，EC and PM10 were much influenced by wind：they were low (21．2±16．0)、(8．9±5．1)、(30．2~20．4)、(172．6~98．3) g·m。和2．3±0．9。 asso ciated with strong wind，but high with weak wind．Average OC con- OC，EC和总碳(TC=OC+EC)分别占PM10质量的(12．4±6．4)％、(5．6± centrations in ni ght time were 40％hi er than that in daytime．Averaged 2．3)％和(18±9．2)％。OC，EC和PM10浓度变化范围较大，变化趋势相 EC concentrations in daytime were close to that in night time．OC con- 似，明显受风速影响，风速较大时浓度较小。PM10和OC浓度在夜间明 centrations reached peak in night time due to pollution accumulation and 显高于白天．但是EC浓度白天和夜间差别不大。EC在早上交通高峰 stable atmosphere．EC reached peak in the morning corresponds to traffic 期间达到最高值，显示了机动车排放源的明显贡献。OC／EC比值在夜 rush time． The OC／EC ratio in nighttime ranging from 2．4 to 2．7 was 间(2-4～2．7)明显高于白天(1．9～2．0)，这主要是由于机动车白天排放 higher than that in daytime ranging from 1．9 to 2．0．The organic pollution 较多．而夜间机动车相对较少以及燃煤排放较多。北京观测到的TC level and OC／EC ratio in Beijing was higher than other observation re- 浓度和OC／EC比值均高于美国、日本的同期观测结果。分析表明北京 suits in Japan and USA．A simple ratio method was used to estimate the 冬季PM． 中有机碳和无机碳以一次性排放为主。应用比值法估算出 contribution ofsources ofcarbonaceous aerosols in Beijing PM10．The re- 北京冬季PM 中碳气溶胶的来源主要是机动车 (75％贡献)和燃煤 suits