气候变化领域集成服务门户(CCPortal): Transport of aerosols over the French Riviera-link between ground-based lidar and spaceborne observations

CCPortal

DOI	10.5194/acp-19-3885-2019
	Transport of aerosols over the French Riviera-link between ground-based lidar and spaceborne observations
	Chazette P.; Totems J.; Shang X.
发表日期	2019
ISSN	16807316
起始页码	3885
结束页码	3904
卷号	19 期号:6
英文摘要	For the first time, a 355nm backscatter N2-Raman lidar has been deployed on the western part of the French Riviera to investigate the vertical aerosol structure in the troposphere. This lidar system, based at the AERONET site of Toulon-La Garde, performed continuous measurements from 24 June to 17 July 2014, within the framework of the multidisciplinary program Mediterranean Integrated Studies at the Regional and Local Scales (MISTRALS). By coupling these observations with those of the spaceborne instruments Cloud-Aerosol LIdar with Orthogonal Polarization (CALIOP), Spinning Enhanced Visible and InfraRed Imager (SEVIRI), and Moderate Resolution Imaging Spectroradiometers (MODIS), the spatial extents of the aerosol structures are investigated. The origins of the aerosol plumes are determined using back trajectories computed by the Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT). This synergy allowed us to highlight plumes of particulate pollutants moving in the low and medium free troposphere (up to ∼5km above the mean sea level) towards the French Riviera. This pollution originates from the Spanish coast, more particularly from Costa Blanca (including Murcia) and Costa Brava-Costa Daurada (including Barcelona). It is mainly due to traffic, but also to petrochemical activities in these two regions. Desert aerosol plumes were also sampled by the lidar. The sources of desert aerosols have been identified as the Grand Erg Occidental and Grand Erg Oriental. During desert dust events, we highlight significant differences in the optical characteristics in terms of the backscatter-to-extinction ratio (BER, inverse of the lidar ratio) between the planetary boundary layer, with 0.024sr-1 (∼42sr), and the free troposphere, with 0.031sr-1 (∼32sr). These differences are greatly reduced in the case of pollution aerosol plume transport in the free troposphere (i.e., 0.021 and 0.025sr-1). Transported pollution aerosols appear to have similar BER to what is emitted locally. Moreover, using the correlation matrix between lidar aerosol extinction profiles as a function of altitude, we find that during transport events in the low free troposphere, aerosols may be transferred into the planetary boundary layer. We also note that the relative humidity, which is generally higher in the planetary boundary layer (>80%), is found to have no significant effect on the BER. © 2019 Author(s).
语种	英语
scopus关键词	AERONET; aerosol; atmospheric transport; backscatter; CALIOP; lidar; particulate matter; Cote d'Azur; France; Mediterranean Coast [France]; Provence-Alpes-Cote d'Azur; Ziziphus mauritiana
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144541
作者单位	Laboratoire des Sciences du Climat et de l'Environnement (LSCE), CEA-CNRS-UVSQ, UMR 8212, Gif-sur-Yvette, France; Finnish Meteorological Institute, P.O. Box 1627, Kuopio, 70211, Finland
推荐引用方式 GB/T 7714	Chazette P.,Totems J.,Shang X.. Transport of aerosols over the French Riviera-link between ground-based lidar and spaceborne observations[J],2019,19(6).
APA	Chazette P.,Totems J.,&Shang X..(2019).Transport of aerosols over the French Riviera-link between ground-based lidar and spaceborne observations.Atmospheric Chemistry and Physics,19(6).
MLA	Chazette P.,et al."Transport of aerosols over the French Riviera-link between ground-based lidar and spaceborne observations".Atmospheric Chemistry and Physics 19.6(2019).