Synergetic measurements of aerosols over São Paulo, Brazil using LIDAR, sunphotometer and satellite data during the dry season

Landulfo, E; Papayannis, A; Artaxo, P; Castanho, ADA; De Freitas, AZ; Souza, RF; Vieira Jr ,ND; Jorge, MPMP; Sanchez-Ccoyllo, OR; Moreira, DS

dc.contributor.author	Landulfo, E	en
dc.contributor.author	Papayannis, A	en
dc.contributor.author	Artaxo, P	en
dc.contributor.author	Castanho, ADA	en
dc.contributor.author	De Freitas, AZ	en
dc.contributor.author	Souza, RF	en
dc.contributor.author	Vieira Jr ,ND	en
dc.contributor.author	Jorge, MPMP	en
dc.contributor.author	Sanchez-Ccoyllo, OR	en
dc.contributor.author	Moreira, DS	en
dc.date.accessioned	2014-03-01T01:19:35Z
dc.date.available	2014-03-01T01:19:35Z
dc.date.issued	2003	en
dc.identifier.issn	1680-7324	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/15594
dc.subject	Satellite Data	en
dc.subject	Dry Season	en
dc.subject.classification	Meteorology & Atmospheric Sciences	en
dc.subject.other	TROPOSPHERIC AEROSOLS	en
dc.subject.other	OPTICAL-PROPERTIES	en
dc.subject.other	MODELING SYSTEM	en
dc.subject.other	AIR-POLLUTION	en
dc.subject.other	AERONET	en
dc.subject.other	INSTRUMENT	en
dc.subject.other	CONVECTION	en
dc.subject.other	ACCURACY	en
dc.subject.other	NETWORK	en
dc.subject.other	GREECE	en
dc.title	Synergetic measurements of aerosols over São Paulo, Brazil using LIDAR, sunphotometer and satellite data during the dry season	en
heal.type	journalArticle	en
heal.identifier.primary	10.5194/acp-3-1523-2003	en
heal.identifier.secondary	http://dx.doi.org/10.5194/acp-3-1523-2003	en
heal.language	English	en
heal.publicationDate	2003	en
heal.abstract	A backscattering LIDAR system, the first of this kind in Brazil, has been set-up in a suburban area in the city of São Paulo (23°33' S, 46°44' W) to provide the vertical profile of the aerosol backscatter coefficient at 532 nm up to an altitude of 4-6 km above sea level (asl). The measurements have been carried out during the second half of the so-called Brazilian dry season, September and October 2001 and during the first half of the dry season in August and September 2002. The LIDAR data are presented and analysed in synergy with aerosol optical thickness (AOT) measurements obtained by a CIMEL sun-tracking photometer in the visible spectral region and with satellite measurements obtained by the MODIS sensor. This synergetic approach has been used, not only to validate the LIDAR data, but also to derive a typical value (45 sr) of the so-called extinction-tobackscatter ratio (LIDAR ratio) during the dry season. The satellite data analysis offers additional information on the spatial distribution of aerosols over Brazil including the determination of aerosol source regions over the country. The LIDAR data were also used to retrieve the Planetary Boundary Layer (PBL) height, aerosol layering and the structure of the lower troposphere over the city of São Paulo. These first LIDAR measurements over the city of São Paulo during the dry season showed a significant variability of the AOT in the lower troposphere (0.5-5 km) at 532 nm. It was also found that the aerosol load is maximized in the 1-3 km height region, although up to 3 km thick aerosol layers were also detected in the 2.5-5.5 km region in certain cases. Threedimensional 96-hours air mass back-trajectory analysis was also performed in selected cases to determine the source regions of aerosols around São Paulo during the dry season. © 2003 European Geosciences Union.	en
heal.publisher	EUROPEAN GEOPHYSICAL SOC	en
heal.journalName	Atmospheric Chemistry and Physics	en
dc.identifier.doi	10.5194/acp-3-1523-2003	en
dc.identifier.isi	ISI:000185623000001	en
dc.identifier.volume	3	en
dc.identifier.issue	5	en
dc.identifier.spage	1523	en
dc.identifier.epage	1539	en