Summertine re-circulations of air pollutans over the north-eastern Iberian coast observed from systematic EARLINET lidar measurements in Barcelona
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Tipus de documentArticle
Data publicació2004-06-30
EditorPergamon-Elsevier Science LTD
Condicions d'accésAccés obert
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Reconeixement-NoComercial-SenseObraDerivada 2.5 Genèrica
Descripció
Regular aerosol backscatter measurements using an elastic-backscatter lidar were performed from May 2000 to
December 2002 in Barcelona (Spain) in the frame of EU EARLINET Project (European Aerosol Research Lidar
Network). Vertical profiles retrievedin a regular schedule confirmedthe presence of multiple aerosol layers of regional
origin above the mixing layer during numerous measurement days. Analysis of the meteorological situation of the
corresponding days showed common synoptic regimes, which are typical in summertime around the region. As
documented by earlier studies, under strong insolation and weak synoptic forcing, sea breezes and mountain-induced
winds develop to create re-circulations of pollutants along the eastern Iberian coast. Layers are formed when aerosols
are injectedfrom the mountains into the return flow at various heights andd istances from the coast. Aerosol layers can
be foundabove the mixing layer up to 4000m with variable thickness typically rangedbetween 100 and1000 m. The
mixing height mainly oscillates between 400 and 800m asl in periods of maximum insolation. Four selected episodes are
analysed combining lidar profiles, radiosoundings and synoptic meteorology information. One of them includes
regional re-circulation aerosols at low levels andupper Saharan dust layers. Maximum backscatter coefficients ranged
from 1 10 6 to 2 10 6 (m sr) 1 at the wavelength of 1064 nm. Assuming a lidar ratio of 30 sr (60 sr for Saharan
dust), aerosol optical depths above the mixing layer ranged from 0.016 to 0.073. Detailed mesoscale analysis of one
episode is performed by means of high resolution modelling with the PSU/NCAR Mesoscale Model 5 (MM5).
CitacióC. Perez M. Sicard, O. Jorba, A. Comerón, J.M. Baldasano. (2004). Summertine re-circulations of air pollutans over the north-eastern Iberian coast observed from systematic EARLINET lidar measurements in Barcelona. ATMOSPHERIC ENVIRONMENT , 38 ( ): 3983-4000. ISSN:1352-2310
ISSN1352-2310
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SummertimeRecirculations.pdf | 1,747Mb | Visualitza/Obre |