In:
Atmospheric Chemistry and Physics, Copernicus GmbH, Vol. 19, No. 3 ( 2019-02-06), p. 1537-1553
Kurzfassung:
Abstract. Air quality on the east coast of Peninsular Malaysia is influenced by local
anthropogenic and biogenic emissions as well as marine air masses from the
South China Sea and aged emissions transported from highly polluted East
Asian regions during the winter monsoon season. An atmospheric observation
tower has been constructed on this coastline at the Bachok Marine Research Station. Daily PM2.5 samples were collected from
the top of the observation tower over a 3-week period, and ion chromatography
was used to make time-resolved measurements of major atmospheric ions present
in aerosol. SO42- was found to be the most dominant ion present
and on average made up 66 % of the total ion content. Predictions of
aerosol pH were made using the ISORROPIA II
thermodynamic model, and it was estimated that the aerosol was highly acidic,
with pH values ranging from −0.97 to 1.12. A clear difference in aerosol
composition was found between continental air masses originating from
industrialised regions of East Asia and marine air masses predominantly
influenced by the South China Sea. For example, elevated SO42-
concentrations and increased Cl− depletion were observed when
continental air masses that had passed over highly industrialised regions of
East Asia arrived at the measurement site. Correlation analyses of the ionic
species and assessment of ratios between different ions provided an insight
into common sources and formation pathways of key atmospheric ions, such as
SO42-, NH4+ and C2O42-. To our
knowledge, time-resolved measurements of water-soluble ions in PM2.5 are
virtually non-existent in rural locations on the east coast of Peninsular
Malaysia. Overall this dataset contributes towards a better understanding of
atmospheric composition in the Maritime Continent, a region of the tropics
that is vulnerable to the effects of poor air quality, largely as a result of
rapid industrialisation in East Asia.
Materialart:
Online-Ressource
ISSN:
1680-7324
DOI:
10.5194/acp-19-1537-2019
DOI:
10.5194/acp-19-1537-2019-supplement
Sprache:
Englisch
Verlag:
Copernicus GmbH
Publikationsdatum:
2019
ZDB Id:
2092549-9
ZDB Id:
2069847-1
