Hanif, Norfazrin Mohd and Reeves, Claire E. and Oram, David E. and Ashfold, Matthew J. and Panagi, Marios and Fleming, Zoe L. and Gooch, Lauren J. and Laube, Johannes C. and Abu Samah, Azizan and Abdullah, Ahmad Amin and Sturges, William T. (2020) Enhanced chlorinated very short-lived substances in South East Asia: Potential source regions and source types. In: 2nd International Conference on Green Environmental Engineering and Technology (IConGEET), 23 July 2020, Online.
Full text not available from this repository.Abstract
Enhancements of the mixing ratios of short-lived halogenated gases were observed in air samples collected at Bachok Marine Research Station (BMRS), Peninsular Malaysia during Northern Hemisphere winters in 2013/2014 and 2015/2016. This study investigates the potential source regions and source types that influenced the variability in chlorinated very short-lived substances (Cl-VSLS) dichloromethane, 1,2-dichloroethane, trichloromethane, tetrachloroethene] and methyl halides methyl chloride and methyl bromide]. The UK Met Office's Numerical Atmospheric Modelling Environment ( NAME) dispersion model, was used for tracking the origin of air masses arriving at BMRS. For the purpose of identifying possible sources of these compounds, carbon monoxide (CO) emission data taken from the Representative Concentration Pathway 8.5 were used along with NAME footprints to calculate modelled CO mixing ratios. A correlation analysis between the mixing ratios of measured compounds and the modelled CO from various emission sectors was perform to assess the extent to which emission sectors might be related to the mixing ratios of halogenated gases. The results show that the events of higher mixing ratios were associated with air masses, especially from East China. During the 2013/2014 campaign, the modelled CO from industrial, solvents and agriculture (waste burning on fields) were significantly correlated with the mixing ratios of Cl-VSLS (R > 0.7) and methyl halides (R > 0.40). During the 2015/2016 campaign, the strength of these correlations reduced for Cl-VSLS (R > 0.5) and with no significant correlations for methylhalides. Instead, mixing ratios of methyl halides were correlated (R=0.4) with modelled CO from forest burning. This work provides evidence that East and South East Asia act as important sources of halogenated gases. This is of significant given the proximity of these regions to prevalent deep convection which can rapidly transport these halogen-containing gases into the stratosphere and impact the ozone layer.
| Item Type: | Conference or Workshop Item (Paper) |
|---|---|
| Funders: | UNSPECIFIED |
| Additional Information: | 2nd International Conference on Green Environmental Engineering and Technology (IConGEET), Online, Jul 23, 2020 |
| Uncontrolled Keywords: | Enhanced chlorinated; Very short-lived substances; South East Asia; Source regions; Source types |
| Subjects: | Q Science > Q Science (General) |
| Divisions: | Deputy Vice Chancellor (Research & Innovation) Office > Institute of Ocean and Earth Sciences |
| Depositing User: | Ms Zaharah Ramly |
| Date Deposited: | 14 Jun 2023 02:35 |
| Last Modified: | 14 Jun 2023 02:35 |
| URI: | http://eprints.um.edu.my/id/eprint/37022 |
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