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• W3144034164 abstract "Measurements of C2‐C8 non-methane hydrocarbons (NMHCs) have been made in situ at Halley Base, Antarctica (75 ◦ 35 � S, 26 ◦ 19 � W) from February 2004 to February 2005 as part of the Chemistry of the Antarctic Boundary Layer and the Interface with Snow (CHABLIS) experiment. The data show long- and short-term variabilities in NMHCs controlled by the seasonal and geographic dependence of emissions and variation in atmospheric removal rates and pathways. Ethane, propane, iso-butane, n-butane and acetylene abundances followed a general OH-dependent sinusoidal seasonal cycle. The yearly averages were 186, 31, 3.2, 4.9 and 19 pptV, respectively, lower than those which were reported in some previous studies. Superimposed on a seasonal cycle was shorter-term variability that could be attributed to both synoptic airmass variability and localized loss processes due to other radical species. Hydrocarbon variability during periods of hour-to-day-long surface O3 depletion in late winter/early spring indicated active halogen atom chemistry estimated to be in the range 1.7 × 10 3 ‐3.4 × 10 4 atom cm −3 for Cl and 4.8 × 10 6 ‐9.6 × 10 7 atom cm −3 for Br. Longer-term negative deviations from sinusoidal behaviour in the late August were indicative of NMHC reaction with a persistent [Cl] of 2.3 × 10 3 atom cm −3 . Maximum ethene and propene of 157 and 179 pptV, respectively, were observed in the late February/early March, consistent with increased oceanic biogenic emissions; however, their presence was significant year-round (June‐August concentrations of 17.1 ± 18.3 and 7.9 ± 20.0 pptV, respectively)." @default.
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• W3144034164 date "2007-02-01" @default.
• W3144034164 modified "2023-10-16" @default.
• W3144034164 title "OH and halogen atom influence on the variability of non-methane hydrocarbons in the Antarctic Boundary Layer" @default.
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• W3144034164 doi "https://doi.org/10.3402/tellusb.v59i1.16966" @default.
• W3144034164 hasPublicationYear "2007" @default.
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