In situ measurements of enhanced crystal number densities in cirrus clouds caused by aircraft exhaust
In situ measurements of enhanced crystal number densities in cirrus clouds caused by aircraft exhaust
复制标题
飞机尾气引起的卷云中晶体数密度增强的原位测量
DOI：
10.1029/98jd00807
复制
发表时间：
1998
影响因子：
--
通讯作者：
S. Ohlsson
中科院分区：
文献类型：
--
作者：
J. Ström;S. Ohlsson
同时测量卷云晶体中的晶体数密度和吸收物质的浓度，发现在吸收物质超过0.01 μg m−3的云区域，晶体数密度在统计学上更高。晶体数密度的这种增强取决于气溶胶数密度在因子1.6和2.8之间。吸收特征显示为2至8公里宽的带状结构，这表明老化的飞机羽流是吸收材料的来源。在最常使用的飞行高度层，晶体中吸收物质的浓度超过0.01 μg m−3，在卷云中超过40%的时间。
Concurrent measurements of crystal number densities and concentrations of absorbing material contained in cirrus crystals reveal statistically higher crystal number densities in areas of the cloud where absorbing material exceeds 0.01 μg m−3. This enhancement in crystal number density ranged between a factor 1.6 and 2.8 depending on the aerosol number density. The absorption signature appeared as banded structures 2 to 8 km wide, which suggests aged aircraft plumes as the source of absorbing material. In the altitudes of the most frequently used flight levels, the concentration of absorbing material in crystals exceeded 0.01 μg m−3 during more than 40% of the time in cirrus clouds.