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title Assessing the mineral dust from North Africa over Portugal region using BSC-DREAM8b model
authors Monteiro, A; Fernandes, AP; Gama, C; Borrego, C; Tchepel, O
author full name Monteiro, Alexandra; Fernandes, Ana Patricia; Gama, Carla; Borrego, Carlos; Tchepel, Oxana
title Assessing the mineral dust from North Africa over Portugal region using BSC-DREAM8b model
nationality internacional
language English
document type Article
author keywords Mineral dust; BSC-DREAM8b model; long-term assessment; episodes; cluster analysis
abstract Over the last decade, air pollution has become a major problem in Portugal mainly due to the high concentrations of particulate matter in the atmosphere, which surpassed the daily limit values. An abundant type of natural atmospheric aerosol is related with the suspension and long-range transport of mineral dust from North Africa deserts. The main objective of this work was to assess the mineral dust over Portugal, namely in what concerns both long-term period (one year) and episode peaks. The BSC-DREAM8b v1.0 model was applied for the entire year of 2011 and the modeled surface concentrations were explored. The annual mean of the simulated dust has a magnitude of 2-6 mu g m(-3). The monthly average analysis highlights the largest mineral dust average values in April and May (about 4 mu g m(-3) higher than the other months). The influence of the transport of mineral dust from North Africa to Portugal is limited on time scale, since in 50% of the time this contribution is below 0.2 mu g m(-3). Only when high percentiles are analyzed the dust surface concentrations over Portugal become relevant (>3 mu g m(-3); with peak contribution around 10-25 mu g m(-3)). To characterize the strongest episodes of dust, a group of days with modeled surface daily concentrations above 5 mu g m(-3) was selected, and data were extracted for 7 sites, spatially distributed along Portugal. A cluster analysis of the air parcels back trajectories that arrive at each site was performed in order to identify the mean flow patterns associated to each mineral dust episode. The prevalence of the flow regimes coming from North Africa during the episode days was different for the studied sites, with high frequency (above 70%) at south sites. This work contributes to the characterization and assessment of the dust episodes that affect Portugal, on a yearly basis and based on a modeling approach.
author address [Monteiro, Alexandra; Fernandes, Ana Patricia; Gama, Carla; Borrego, Carlos] Univ Aveiro, CESAM, P-3810193 Aveiro, Portugal; [Monteiro, Alexandra; Fernandes, Ana Patricia; Gama, Carla; Borrego, Carlos] Univ Aveiro, Dept Environm & Planning, P-3810193 Aveiro, Portugal; [Tchepel, Oxana] Univ Coimbra, Dept Civil Engn, CITTA, P-3030788 Coimbra, Portugal
reprint address Monteiro, A (reprint author), Univ Aveiro, CESAM, P-3810193 Aveiro, Portugal.
e-mail address alexandra.monteiro@ua.pt
funding agency and grant number Portuguese 'Ministerio da Ciencia, da Tecnologia e do Ensino Superior' [SFRH/BPD/63796/2009, SFRH/BD/86307/2012, SFRH/BD/87468/2012]
funding text This work was supported by the Portuguese 'Ministerio da Ciencia, da Tecnologia e do Ensino Superior' through the PostDoctoral fellowship of Alexandra Monteiro (SFRH/BPD/63796/2009) and the PhD fellowships of Ana Patricia Fernandes (SFRH/BD/86307/2012) and Carla Gama (SFRH/BD/87468/2012). The authors gratefully acknowledge the Barcelona Supercomputing Center - Centro Nacional de Supercomputacion (BSC-CNS) for the provision and support with the BSC-DREAM8b dust model, and NOAA Air Resources Laboratory (ARL) for the provision of the HYSPLIT transport and dispersion model and the READY website (http://www.arl.noaa.gov/ready.html) from which the meteorological data used to force HYSPLIT has been downloaded.
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cited reference count 45
publisher city BUCA
issn 1309-1042
29-character source abbreviation ATMOS POLLUT RES
iso source abbreviation Atmos. Pollut. Res.
publication date JAN
year published 2015
volume 6
issue 1
beginning page 70
ending page 81
digital object identifier (doi) 10.5094/APR.2015.009
page count 12
web of science category Environmental Sciences
subject category Environmental Sciences & Ecology
document delivery number CE1AJ
unique article identifier WOS:000351543300009
link http://www.atmospolres.com/articles/Volume6/issue1/APR-15-009.pdf