The relationship between aerosol backscatter coefficient and atmospheric relative humidity in an urban area over Athens, Greece, using raman lidar and radiosonde data

Angelou, N; Papayannis, A; Mamouri, RE; Amiridis, V; Tsaknakis, G

dc.contributor.author	Angelou, N	en
dc.contributor.author	Papayannis, A	en
dc.contributor.author	Mamouri, RE	en
dc.contributor.author	Amiridis, V	en
dc.contributor.author	Tsaknakis, G	en
dc.date.accessioned	2014-03-01T02:04:14Z
dc.date.available	2014-03-01T02:04:14Z
dc.date.issued	2011	en
dc.identifier.issn	01431161	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/29409
dc.subject.other	Aerosol lidars	en
dc.subject.other	Altitude range	en
dc.subject.other	Annual mean	en
dc.subject.other	Athens , Greece	en
dc.subject.other	Backscatter coefficients	en
dc.subject.other	Backscatter lidar	en
dc.subject.other	Correlation coefficient	en
dc.subject.other	EARLINET	en
dc.subject.other	Free troposphere	en
dc.subject.other	Lidar systems	en
dc.subject.other	Linear correlation	en
dc.subject.other	Planetary boundary layers	en
dc.subject.other	R value	en
dc.subject.other	Radiosonde datas	en
dc.subject.other	Raman LIDAR	en
dc.subject.other	Relative humidities	en
dc.subject.other	Seasonal variation	en
dc.subject.other	Statistical assessment	en
dc.subject.other	Urban areas	en
dc.subject.other	Vertical profile	en
dc.subject.other	Atmospheric aerosols	en
dc.subject.other	Atmospheric humidity	en
dc.subject.other	Backscattering	en
dc.subject.other	Optical radar	en
dc.subject.other	Radiosondes	en
dc.subject.other	Troposphere	en
dc.subject.other	Atmospherics	en
dc.subject.other	aerosol	en
dc.subject.other	boundary layer	en
dc.subject.other	correlation	en
dc.subject.other	lidar	en
dc.subject.other	radiosonde	en
dc.subject.other	relative humidity	en
dc.subject.other	statistical analysis	en
dc.subject.other	troposphere	en
dc.subject.other	urban atmosphere	en
dc.subject.other	vertical profile	en
dc.subject.other	Athens [Attica]	en
dc.subject.other	Attica	en
dc.subject.other	Balkan	en
dc.subject.other	Greece	en
dc.subject.other	Turkmenistan	en
dc.title	The relationship between aerosol backscatter coefficient and atmospheric relative humidity in an urban area over Athens, Greece, using raman lidar and radiosonde data	en
heal.type	journalArticle	en
heal.identifier.primary	10.1080/01431161.2010.531786	en
heal.identifier.secondary	http://dx.doi.org/10.1080/01431161.2010.531786	en
heal.publicationDate	2011	en
heal.abstract	In this article a statistical assessment concerning the relationship between the aerosol backscatter coefficient (βaer) and the relative humidity (RH) in the lower andmiddle troposphere, over Athens (Greece), is presented. For the purpose of this study, correlative radiosonde and aerosol backscatter lidar data were analysed for a period of 4 years (January 2003-December 2006), as obtained in the framework of the European Aerosol Lidar Network (EARLINET) project. The vertical profiles of the aerosol backscatter coefficients were measured by a combined Raman/elastic lidar system at ultraviolet (355 nm) and visible (532 nm) wavelengths. The correlation coefficient (R) of the vertical profiles of the RH against the backscatter coefficient of aerosols was investigated in altitudes within the free troposphere (0-6000 m). The altitude range was divided into three areas: 0 m up to the top of the Planetary Boundary Layer (PBL); PBL up to PBL + 2000 m; and PBL + 2000 m up to 6000 m. The properties and seasonal variations of the height of the PBL were also studied. The annual mean PBL height over Athens was found to be (1320 ± 480) m, while during the warm period of the year (spring-summer) the PBL was higher than during the cold period (autumn-winter). Regarding the correlation coefficient (R), low (0-0.5) and medium (0.5-0.8) R values were mostly observed during the warmmonths of the year. For the aerosols originating from the Balkan area the highest correlation was observed at both wavelengths (R = 0.71 at 355 nm and R = 0.41 at 532 nm), especially during the years 2003 and 2005 (R = 0.61 at 355 nm and R = 0.93 at 532 nm). The almost linear correlation of this type of aerosols can be attributed to the fact that these remained for a longer time in a coherently alternating atmosphere, therefore having the tendency to become homogenized. © 2011 Taylor & Francis.	en
heal.journalName	International Journal of Remote Sensing	en
dc.identifier.doi	10.1080/01431161.2010.531786	en
dc.identifier.volume	32	en
dc.identifier.issue	24	en
dc.identifier.spage	8983	en
dc.identifier.epage	9006	en