Identification of Elevated Aerosol Layers and their properties by using ground-based aerosol measurements over the foothills of the central Himalayas

A. Chandel, C. Sarangi, R. Hooda, A. Hyvärinen
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Abstract

Previous studies have identified and examined the elevated aerosol layers (EAL) using LiDAR measurements from CALIPSO or MPLNET. Here we identify the EALs and their properties using ground-based aerosol measurements in Mukteshwar, a remote site in the Himalayan Mountains in northern India, from 2006–2013 (March-August only). EAL events are screened from the 8-year measurements by considering the ratio of PMIO to PM2.5 equal to or greater than two. BC increases by two to threefold and shows a good association with the PM concentration during the EAL events. The presence of strongly absorbing and scattering aerosol in EAL can be seen by their varying range of 10–50 Mm-1 and 50–350 Mm-1, respectively. CALIPSO, MPLNET, Dust Aerosol Optical Thickness, and NASA'S Worldview Earthdata are used to verify the EAL events identified from the ground-based aerosol measurements. The back-trajectory analysis clearly shows an influx of airmass from Arabia's arid regions and the west Arabian sea.
利用地面气溶胶测量在喜马拉雅山脉中部丘陵地区识别高架气溶胶层及其特性
以前的研究已经使用来自CALIPSO或MPLNET的激光雷达测量确定并检查了升高的气溶胶层(EAL)。在这里,我们从2006年至2013年(仅3月至8月)在印度北部喜马拉雅山脉的一个偏远地点Mukteshwar使用地面气溶胶测量来确定EALs及其特性。通过考虑PMIO与PM2.5的比值等于或大于2,从8年测量中筛选EAL事件。在EAL事件中,BC增加了2到3倍,并显示出与PM浓度的良好关联。在10 ~ 50 Mm-1和50 ~ 350 Mm-1的变化范围内,可以看出EAL中存在强吸收和强散射气溶胶。CALIPSO、MPLNET、尘埃气溶胶光学厚度和NASA的世界观地球数据被用来验证从地面气溶胶测量中确定的EAL事件。反轨迹分析清楚地显示了来自阿拉伯干旱地区和西阿拉伯海的气团的涌入。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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