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Lidar and Sun photometer observations of atmospheric boundary-layer characteristics over an urban area in a mountain valley

Kolev, N and Grigorov, I and Kolev, I and Devara, PCS and Raj, PE and Dani, KK (2007) Lidar and Sun photometer observations of atmospheric boundary-layer characteristics over an urban area in a mountain valley. Boundary-Layer Meteorology, 124 (1). pp. 99-115.

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Abstract

We present measurements of the vertical aerosol structure and the aerosol optical depth in the lower troposphere performed above the city of Sofia (an urban area situated in a mountain valley), western Bulgaria by means of a ground-based aerosol lidar operating continuously for a number of years. The lidar measurements were accompanied by measurements of the aerosol optical depth (AOD) in the visible and near infrared regions of the spectrum performed in October 2004 using Microtops II radiometers. The maximum values of the AOD were found to occur 1-2 h before the complete development of the atmospheric boundary layer, i.e. during the residual layer destruction, which confirms our hypothesis concerning the slope circulation effect on the processes taking place in the atmospheric boundary layer. The AOD values obtained by the lidar are lower than those taken by the sun photometer. Further, the AOD exhibits two different types of behaviour. In the case of a 'clear atmosphere' (i.e. in the absence of volcanic eruptions and/or dust transport from the Sahara) most of the aerosol accumulated within the atmospheric boundary layer over the urban area considered. The combined use of the two instruments allows the comparison between the optical characteristics of the atmospheric aerosol (e.g. aerosol extinction coefficient, etc.) obtained by the lidar and through an independent method (sun photometer).

Item Type: Article
Additional Information: Copyright of this article belongs to Springer.
Uncontrolled Keywords: Atmospheric aerosols; Atmospheric optics; Boundary layers; Meteorological instruments; Optical radar; Photometers, Aerosol optical depth; Atmospheric boundary layer; Mixing layer; Residual layer; Sun photo meter, Meteorology, Atmospheric aerosols; Atmospheric optics; Boundary layers; Meteorological instruments; Meteorology; Optical radar; Photometers, aerosol property; boundary layer; infrared spectroscopy; lidar; near infrared; optical depth; orography; photometer; troposphere; urban area, Bulgaria; Eurasia; Europe; Sofia; Southern Europe
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 19 Feb 2015 05:38
Last Modified: 19 Feb 2015 05:38
URI: http://moeseprints.incois.gov.in/id/eprint/1889

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