Abstract
The ambient concentrations of carbonyl compounds were measured in Waliguan (WLG) Observatory at the east edge of Qinghai‐Tibetan in August–September and December, 2005. The average concentrations of formaldehyde, acetaldehyde, acetone, and 2‐butenal were 4.16 ± 1.89, 4.25 ± 3.32, 2.02 ± 0.86, and 1.93 ± 1.58 ppbv (n = 42), respectively, in August–September and 1.48 ± 0.42, 3.91 ± 0.81, 1.88 ± 0.69, and 0.69 ± 0.16 ppbv (n = 12), respectively, in December. Biomass used as fuel for cooking by local residents was considered as the dominant source for 2‐butenal. Photooxidation of VOC (especially biogenic emission of isoprene) was one source for formaldehyde and methyl vinyl ketone in August–September. Animal excrement was probably an additional source for formaldehyde and acetone. Back trajectory analysis indicated that long‐distance transportation from polluted air might be one important source for formaldehyde, acetone, and acetaldehyde in WLG.
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