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- W2323651799 abstract "Abstract. This work reports the first detailed analysis of methanol concentrations in rainwater. Methanol concentrations measured in 49 rain events collected between 28 August 2007 to 10 July 2008 in Wilmington, NC, USA, ranged from below the detection limit of 6 nM to 9.3 μM with a volume weighted average concentration of 1.2 ± 0.2 μM. Methanol concentrations in rainwater were up to ~200× greater than concentrations observed in marine waters indicating wet deposition as a potential significant source to marine waters. Assuming these methanol concentrations are an appropriate proxy for global methanol rainwater concentrations the global methanol wet deposition sink is estimated as 20 Tg yr−1 which implies previous methanol budgets underestimate removal by precipitation. Methanol concentrations did not correlate with H+, NO3−, and NSS, which suggest that the dominant source of the alcohol to rainwater is not anthropogenic. However, methanol concentrations were strongly correlated with acetaldehyde which has a primarily biogenic input. Methanol volume weighted concentration during the growing season (1.5 + 0.3 μM) was more than double that of the non-growing season (0.7 + 0.1 μM), further promoting biogenic emissions as the primary cause of fluctuating methanol concentrations. Methanol concentrations peaked in rainwater collected between the time period 12:00–06:00 p.m. Peaking during this period of optimal sunlight implies a direct relationship to photochemical methanol production but there are also increases in biogenic activity during this time period. Rain events with terrestrial origins had higher concentrations than those of marine origin demonstrating the significance of the continental source of methanol in rainwater." @default.
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- W2323651799 date "2014-01-17" @default.
- W2323651799 modified "2023-10-06" @default.
- W2323651799 title "Temporal and spatial variations in rainwater methanol" @default.
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- W2323651799 doi "https://doi.org/10.5194/acpd-14-1375-2014" @default.
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