Anthropogenic aerosols and gases in the lower troposphere at Alert Canada in April 1986
Anthropogenic aerosols and gases in the lower troposphere at Alert Canada in April 1986
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1986 年 4 月加拿大警报中心对流层低层的人为气溶胶和气体
DOI：
10.1007/bf00052827
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发表时间：
1989
影响因子：
2
通讯作者：
S. Landsberger
中科院分区：
文献类型：
--
作者：
L. Barrie;G. Hartog;J. Bottenheim;S. Landsberger
1986年4月期间，作为国际北极空气化学研究（AGASP-2）的一部分，在加拿大阿勒特（北纬82.5度，西经62.3度）进行了气溶胶微量元素、硫和氮的氧化物以及颗粒数大小分布的地面观测。烟雾污染十分明显，每日气溶胶数量（直径大于0.15微米）和SO 4 =浓度分别在125 - 260 cm-3和1.6 - 4.5 μg m-3之间。烟霞及相关的酸性气体在该段期间有增加的趋势。SO2和过氧乙酰硝酸酯（PAN）的混合比分别在140 - 480和370 - 590 ppt（v）的范围内。最终产物氮中约88%以PAN形式存在。在相对湿度为2%的空气干燥条件下，气溶胶质量粒径分布在0.3 μm处有一个主模态，在2.5 μm处有一个次模态。1.5 μm以下的气溶胶质量与SO_4 ~+、K ~+和PAN有较好的相关性。随着太阳从地平线上升起并保持在地平线上，整个4月空气中总硫和氮氧化物的氧化部分稳步增加。欧亚大陆和阿勒特之间的二氧化硫平均氧化速率估计为0.25 - 0.5% h−1。北极大气中总氮氧化物与总硫氧化物的摩尔比（0.67±0.17）与欧洲排放量相当。一个非常强的逆相关性过滤溴和O3导致的结论是，O3的破坏和过滤溴生产低于北极地面辐射反演与对流层光化学反应涉及天然存在的气态溴化合物。
During April 1986, as part of an international arctic air chemistry study (AGASP-2), ground level observations of aerosol trace elements, oxides of sulphur and nitrogen and particle number size distribution were made at Alert Canada (82.5N, 62.3W). Pollution haze was evident as indicated by daily aerosol number (size > 0.15 μm diameter) and SO4= concentrations in the range 125 – 260 cm−3 and 1.6 – 4.5 μg m−3, respectively. Haze and associated acidic gases tended to increase throughout the period. SO2 and peroxyacetylnitrate (PAN) mixing ratios were in the range 140 – 480 and 370 – 590 ppt(v), respectively. About 88% of the total end-product nitrogen was in the form of PAN. In air dried to 2% relative humidity by warming to room temperature, the aerosol mass size distribution had a major mode at 0.3 μm diameter and a minor one at 2.5 μm. Aerosol mass below 1.5 μm was well correlated with SO4=, K+ and PAN. There was a steady increase in the oxidized fraction of total airborne sulphur and nitrogen oxide throughout April as the sun rose above the horizon and remained above. The mean oxidation rate of SO2 between Eurasia and Alert was estimated as 0.25 – 0.5% h−1. The molar ratio of total nitrogen oxide to total sulphur oxide in the arctic atmosphere (0.67±0.17) was comparable to that in European emissions. A remarkably strong inverse correlation of filterable Br and O3 led to the conclusion that O3 destruction and filterable Br production below the Arctic surface radiation inversion is associated with tropospheric photochemical reactions involving naturally occurring gaseous bromine compounds.