AMTD Atmospheric Measurement Techniques Discussions AMTD 1867-8610 Copernicus GmbH Göttingen, Germany 10.5194/amtd-4-6387-2011 Tracking of urban aerosols using combined lidar-based remote sensing and ground-based measurements He T.-Y. 1 Stanič S. 1 Gao F. 1 Bergant K. 1 2 Veberič D. 1 Song X.-Q. 3 Dolžan A. 4 University of Nova Gorica, Nova Gorica, Slovenia Slovenian Environment Agency, Ljubljana, Slovenia Ocean University of China, Qingdao, China Optotek d.o.o., Ljubljana, Slovenia 20 10 2011 4 5 6387 6410 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-meas-tech-discuss.net/4/6387/2011/amtd-4-6387-2011.html The full text article is available as a PDF file from http://www.atmos-meas-tech-discuss.net/4/6387/2011/amtd-4-6387-2011.pdf

A measuring campaign was performed over the neighboring towns of Nova Gorica in Slovenia and Gorizia in Italy on 24 and 25 May 2010, to investigate the concentration and distribution of urban aerosols. Tracking of two-dimensional spatial and temporal aerosol distributions was performed using scanning elastic lidar operating at 1064 nm. In addition, PM<sub>10</sub> concentrations of particles, NO<sub>x</sub> and meteorological data were continuously monitored within the lidar scanning region. Based on the collected data, we investigated the flow dynamics and the aerosol concentrations within the lower troposphere and an evidence for daily aerosol cycles. We observed a number of cases with spatially localized increased lidar returns, which were found to be due to the presence of point sources of particulate matter. Daily aerosol concentration cycles were also clearly visible with a peak in aerosol concentration during the morning rush hours and daily maximum at around 17:00 Central European Time. We also found that the averaged horizontal atmospheric extinction within the scanning region 200 m above the ground is correlated to the PM<sub>10</sub> concentration at the ground level with a correlation coefficient of 0.64, which may be due to relatively quiet meteorological conditions and basin-like terrain configuration.

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