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title Investigating ozone episodes in Portugal: a wavelet-based approach
authors Monteiro, A; Gouveia, S; Scotto, MG; Lopes, J; Gama, C; Feliciano, M; Miranda, AI
author full name Monteiro, A.; Gouveia, S.; Scotto, M. G.; Lopes, J.; Gama, C.; Feliciano, M.; Miranda, A. I.
title Investigating ozone episodes in Portugal: a wavelet-based approach
nationality internacional
language English
document type Article
author keywords Monitoring stations; North Portugal; Ozone episodes; Wavelet transformation
abstract During the summer season, ozone concentrations regularly exceed the legislation limits in the North of Portugal, namely at Douro Norte monitoring station. The origin of such ozone episodes has been widely reported in several studies although uncertainties regarding its origin still remain. This work intends to investigate how the ozone concentrations measured at the Douro Norte nearest stations, located at west and east directions, are related to those measured at Douro Norte by means of coherence and phase transformations methods. The episodes were selected according to the magnitude of the hourly ozone peaks and the occurrence of exceedances of the threshold value at least in two sites. The results point out that 60 % of the selected episodes highlight significant dependence between Douro Norte station and the other two monitoring sites, with different phase signal and a delay range from 2 to 4 h.
author address [Monteiro, A.; Lopes, J.; Gama, C.; Miranda, A. I.] Univ Aveiro, Dept Environm & Planning, CESAM, Aveiro, Portugal; [Gouveia, S.] Univ Aveiro, Inst Elect & Telemat Engn Aveiro IEETA, Aveiro, Portugal; [Gouveia, S.] Univ Aveiro, CIDMA, Aveiro, Portugal; [Scotto, M. G.] Univ Lisbon, CEMAT, Lisbon, Portugal; [Scotto, M. G.] Univ Lisbon, Inst Super Tecn, Lisbon, Portugal; [Feliciano, M.] Polytech Inst Braganca, CIMO, Braganca, Portugal
reprint address Monteiro, A (reprint author), Univ Aveiro, Dept Environm & Planning, CESAM, Aveiro, Portugal.
e-mail address alexandra.monteiro@ua.pt
funding agency and grant number Comissao de Coordenacao e Desenvolvimento Regional do Norte (CCDR-N); Portuguese Foundation for Science and Technology [PTDC/AAG-MAA/4077/2012, SFRH/BD/87468/2012, SFRH/-BPD/87037/2012, PEst-OE/MAT/UI4106/2014, PEst-OE/EEI/-UI0127/2014]
funding text The authors wish to thank the financial support of the Comissao de Coordenacao e Desenvolvimento Regional do Norte (CCDR-N). Thanks are extended to the Portuguese Foundation for Science and Technology for the financial support through the Project MAPLIA (PTDC/AAG-MAA/4077/2012), and the PhD grant of Carla Gama (SFRH/BD/87468/2012) and the Pos-Doc grant of S. Gouveia (SFRH/-BPD/87037/2012), and CIDMA/UA project PEst-OE/MAT/UI4106/2014 (Centro de Investigacao e Desenvolvimento em Matematica e Aplicacoes, CIDMA/UA, Aveiro, www.cidma.mat.ua.pt), and IEETA/UA project PEst-OE/EEI/-UI0127/2014 (Instituto de Engenharia Electronica e Telematica de Aveiro, IEETA/UA, Aveiro, www.ieeta.pt).
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cited reference count 27
publisher city CHAM
publisher address GEWERBESTRASSE 11, CHAM, CH-6330, SWITZERLAND
issn 1873-9318
29-character source abbreviation AIR QUAL ATMOS HLTH
iso source abbreviation Air Qual. Atmos. Health
publication date NOV
year published 2016
volume 9
issue 7
beginning page 775
ending page 783
digital object identifier (doi) 10.1007/s11869-015-0379-7
page count 9
web of science category Environmental Sciences
subject category Environmental Sciences & Ecology
document delivery number DY5ZC
unique article identifier WOS:000385183200006
link http://dx.doi.org/10.1007/s11869-015-0379-7