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- OpenAccess
Formaldehyde and Acetaldehyde at Different Elevations in Mountainous Areas in Hong Kong
並列摘要
Intensive field measurements of formaldehyde (HCHO) and acetaldehyde (CH_3CHO) were concurrently conducted at a mountain site (TMS) and an urban site (TW) at the foot of the same mountain in Hong Kong from September to November 2010. The spatiotemporal variations of HCHO and CH_3CHO, the correlation between HCHO and CH_3CHO and the ratios of HCHO/CH3CHO indicated different impacts of primary emissions and secondary formation at the two sites. The source apportionments of HCHO and CH_3CHO at both sites were investigated using the Positive Matrix Factorization (PMF) model, while the in-situ formation of HCHO and CH_3CHO was estimated using a Photochemical Box Model coupled with Master Chemical Mechanism (PBM-MCM). At TMS, the in-situ formation was the most significant contributor to ambient HCHO and CH_3CHO, accounting for 51 ± 5 and 32 ± 2%, respectively, followed by the transport of photochemically-formed aldehydes, vehicular emissions, biogenic emissions, biomass burning and solvent usage. On the other hand, at TW, the in-situ formation and vehicular emissions explained 55 ± 7% and 18 ± 1% of ambient HCHO, respectively, while vehicular emissions and in-situ formation made comparable contributions to CH_3CHO (~35%). The findings are helpful for the formulation and implementation of appropriate control strategies for aldehydes and their precursors in Hong Kong.
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