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|Title: ||Atmospheric electric field measurements in urban environment and the pollutant aerosol weekly dependence|
|Authors: ||Silva, Hugo|
Mendes, P. B.
Reis, A. Heitor
Harrison, R. G.
|Keywords: ||Atmospheric Electricity|
|Issue Date: ||2014|
|Publisher: ||IOP Publishing|
|Citation: ||1. H G Silva, R Conceição, M Melgão, K Nicoll, P B Mendes, M Tlemçani, A H Reis, R G Harrison, “Atmospheric electric field measurements in urban environment and the pollutant aerosol weekly dependence” Environ. Res. Lett. 9 114025, (2014).|
|Abstract: ||The weekly dependence of pollutant aerosols in the urban environment of Lisbon (Portugal) is
inferred from the records of atmospheric electric field at Portela meteorological station (38°47′N,
9°08′W). Measurements were made with a Bendorf electrograph. The data set exists from 1955
to 1990, but due to the contaminating effect of the radioactive fallout during 1960 and 1970s,
only the period between 1980 and 1990 is considered here. Using a relative difference method a
weekly dependence of the atmospheric electric field is found in these records, which shows an
increasing trend between 1980 and 1990. This is consistent with a growth of population in the
Lisbon metropolitan area and consequently urban activity, mainly traffic. Complementarily,
using a Lomb–Scargle periodogram technique the presence of a daily and weekly cycle is also
found. Moreover, to follow the evolution of theses cycles, in the period considered, a simple
representation in a colour surface plot representation of the annual periodograms is presented.
Further, a noise analysis of the periodograms is made, which validates the results found. Two
datasets were considered: all days in the period, and fair-weather days only.|
|Appears in Collections:||CGE - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica|
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