Total nitrogen dioxide at the Arctic Polar Circle since 1990
Total nitrogen dioxide at the Arctic Polar Circle since 1990
复制标题
1990年以来北极极圈的二氧化氮总量
DOI：
--
复制
发表时间：
1994
期刊：
影响因子：
--
通讯作者：
V. Dorokhov
中科院分区：
文献类型：
--
作者：
F. Goutail;J. Pommereau;A. Sarkissian;E. Kyrö;V. Dorokhov
自1990年1月以来，在芬兰北方的索丹基拉和EASOE期间的另外3个站，用紫外-可见SAOZ二极管阵列光谱仪进行了每日地面NO2柱测量。检查的数据表明：总的NO2减少30%的皮纳图博气溶胶在春季和夏季1992年相比，前几年;在冬季的相关性较差的位涡指示的运动的涡旋和平流的空气从中纬度，频繁在EASOE;没有显着的全球反硝化作用的沉积的硝酸PSC颗粒内的涡旋; NO_2总量与30-50 hPa温度有较好的相关性。后者在1991-92年冬季是出乎意料的，因为在气溶胶层的高度处的大部分NOx（NO + NO2 + ClONO 2 + 2N 2 O 5）应该已经转化为液体硝酸。预计在冬季高纬度地区，这只会缓慢地恢复为氮氧化物。该相关性表明气溶胶水/硫酸液滴的温度依赖性饱和和/或NOx恢复到气相的温度依赖性机制。
Daily ground-based NO2 column measurements have been conducted with UV-visible SAOZ diode-array spectrometers at Sodankyla in northern Finland since January 1990 and at 3 additional stations during EASOE. Inspection of the data indicates: a total NO2 reduction by 30% by the Pinatubo aerosol in spring and summer 1992 compared to the previous years; a poor correlation in winter with potential vorticity indicative of motion of the vortex and of advection of air from mid-latitude, frequent during EASOE; an absence of significant global denitrification by sedimentation of nitric acid on PSC particles inside the vortex; and a high correlation between total NO2 and 30–50 hPa temperature. The latter is unexpected in winter 1991–92, since most of NOx (NO + NO2 + ClONO2 + 2N2O5) at the altitude of the aerosol layer should have been converted into liquid nitric acid. This is expected to revert only slowly to NOx at high latitude in winter. The correlation suggests a temperature dependent saturation of the aerosol water / sulfuric acid droplets and / or a temperature dependent mechanism of restitution of NOx to the gas phase.