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Remote Sens. 2017, 9(10), 978; doi:10.3390/rs9100978

Raman Lidar Observations of Aerosol Optical Properties in 11 Cities from France to Siberia

1
Laboratoire des Sciences du Climat et de l’Environnement (LSCE), Centre National de la Recherche Scientifique (CNRS) and Commissariat à l’Énergie Atomique (CEA), 91191 Gif-sur-Yvette, France; now at Laboratoire de Physico-Chimie de l’Atmosphère (LPCA), Université du Littoral Côte d’Opale (ULCO), 59140 Dunkerque, France
2
Laboratoire des Sciences du Climat et de l’Environnement (LSCE), Centre National de la Recherche Scientifique (CNRS) and Commissariat à l’Énergie Atomique (CEA), 91191 Gif-sur-Yvette, France
3
Laboratoire des Sciences du Climat et de l’Environnement (LSCE), Centre National de la Recherche Scientifique (CNRS) and Commissariat à l’Énergie Atomique (CEA), 91191 Gif-sur-Yvette, France; now at Capgemini Technology Services, 31086 Toulouse, France
*
Author to whom correspondence should be addressed.
Received: 24 August 2017 / Revised: 12 September 2017 / Accepted: 13 September 2017 / Published: 22 September 2017
(This article belongs to the Special Issue Aerosol Remote Sensing)
View Full-Text   |   Download PDF [6221 KB, uploaded 22 September 2017]   |  

Abstract

In June 2013, a ground-based mobile lidar performed the ~10,000 km ride from Paris to Ulan-Ude, near Lake Baikal, profiling aerosol optical properties in the cities visited along the journey and allowing the first comparison of urban aerosols optical properties across Eurasia. The lidar instrument was equipped with N2-Raman and depolarization channels, enabling the retrieval of the 355-nm extinction-to-backscatter ratio (also called Lidar Ratio (LR)) and the linear Particle Depolarization Ratio (PDR) in the urban planetary boundary or residual layer over 11 cities. The optical properties of pollution particles were found to be homogeneous all along the journey: no longitude dependence was observed for the LR, with most values falling within the 67–96 sr range. There exists only a slight increase of PDR between cities in Europe and Russia, which we attribute to a higher fraction of coarse terrigenous particles lifted from bad-tarmac roads and unvegetated terrains, which resulted, for instance, in a +1.7% increase between the megalopolises of Paris and Moscow. A few lower LR values (38 to 50 sr) were encountered above two medium size Siberian cities and in an isolated plume, suggesting that the relative weight of terrigenous aerosols in the mix may increase in smaller cities. Space-borne observations from the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP), retrieved during summer 2013 above the same Russian cities, confirmed the prevalence of aerosols classified as “polluted dust”. Finally, we encountered one special feature in the Russian aerosol mix as we observed with good confidence an unusual aerosol layer displaying both a very high LR (96 sr) and a very high PDR (20%), even though both features make it difficult to identify the aerosol type. View Full-Text
Keywords: aerosol optical properties; Raman lidar; lidar ratio; particle depolarization ratio; Russia aerosol optical properties; Raman lidar; lidar ratio; particle depolarization ratio; Russia
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Dieudonné, E.; Chazette, P.; Marnas, F.; Totems, J.; Shang, X. Raman Lidar Observations of Aerosol Optical Properties in 11 Cities from France to Siberia. Remote Sens. 2017, 9, 978.

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