Validation of CALIPSO space-borne-derived attenuated backscatter coefficient profiles using a ground-based lidar in Athens, Greece

Mamouri, RE; Amiridis, V; Papayannis, A; Giannakaki, E; Tsaknakis, G; Balis, DS

dc.contributor.author	Mamouri, RE	en
dc.contributor.author	Amiridis, V	en
dc.contributor.author	Papayannis, A	en
dc.contributor.author	Giannakaki, E	en
dc.contributor.author	Tsaknakis, G	en
dc.contributor.author	Balis, DS	en
dc.date.accessioned	2014-03-01T01:32:23Z
dc.date.available	2014-03-01T01:32:23Z
dc.date.issued	2009	en
dc.identifier.issn	1867-1381	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20109
dc.subject	Cirrus Cloud	en
dc.subject	Multiple Scattering	en
dc.subject	Planetary Boundary Layer	en
dc.subject	level 1	en
dc.subject	National Technical University of Athens	en
dc.subject.other	aerosol	en
dc.subject.other	air mass	en
dc.subject.other	altitude	en
dc.subject.other	backscatter	en
dc.subject.other	CALIPSO	en
dc.subject.other	cirrus	en
dc.subject.other	inhomogeneity	en
dc.subject.other	lidar	en
dc.subject.other	model validation	en
dc.subject.other	troposphere	en
dc.subject.other	wavelength	en
dc.subject.other	Athens [Attica]	en
dc.subject.other	Attica	en
dc.subject.other	Greece	en
dc.title	Validation of CALIPSO space-borne-derived attenuated backscatter coefficient profiles using a ground-based lidar in Athens, Greece	en
heal.type	journalArticle	en
heal.identifier.primary	10.5194/amt-2-513-2009	en
heal.identifier.secondary	http://dx.doi.org/10.5194/amt-2-513-2009	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	We present initial aerosol validation results of the space-borne lidar CALIOP-onboard the CALIPSO satellite-Level 1 attenuated backscatter coefficient profiles, using coincident observations performed with a ground-based lidar in Athens, Greece (37.9 degrees N, 23.6 degrees E). A multi-wavelength ground-based backscatter/Raman lidar system is operating since 2000 at the National Technical University of Athens (NTUA) in the framework of the European Aerosol Research LIdar NETwork (EARLINET), the first lidar network for tropospheric aerosol studies on a continental scale. Since July 2006, a total of 40 coincidental aerosol ground-based lidar measurements were performed over Athens during CALIPSO overpasses. The ground-based measurements were performed each time CALIPSO overpasses the station location within a maximum distance of 100 km. The duration of the ground-based lidar measurements was approximately two hours, centred on the satellite overpass time. From the analysis of the ground-based/satellite correlative lidar measurements, a mean bias of the order of 22% for daytime measurements and of 8% for nighttime measurements with respect to the CALIPSO profiles was found for altitudes between 3 and 10 km. The mean bias becomes much larger for altitudes lower that 3 km (of the order of 60%) which is attributed to the increase of aerosol horizontal inhomogeneity within the Planetary Boundary Layer, resulting to the observation of possibly different air masses by the two instruments. In cases of aerosol layers underlying Cirrus clouds, comparison results for aerosol tropospheric profiles become worse. This is attributed to the significant multiple scattering effects in Cirrus clouds experienced by CALIPSO which result in an attenuation which is less than that measured by the ground-based lidar.	en
heal.publisher	COPERNICUS GESELLSCHAFT MBH	en
heal.journalName	Atmospheric Measurement Techniques	en
dc.identifier.doi	10.5194/amt-2-513-2009	en
dc.identifier.isi	ISI:000278086100015	en
dc.identifier.volume	2	en
dc.identifier.issue	2	en
dc.identifier.spage	513	en
dc.identifier.epage	522	en