Annual study of oxygenated volatile organic compounds in UK shelf waters

Beale, R, Dixon, JL, Smyth, TJ and Nightingale, PD 2015 Annual study of oxygenated volatile organic compounds in UK shelf waters. Marine Chemistry, 171. 96-106.

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We performed an annual study of oxygenated volatile organic compound (OVOC) seawater concentrations at a site off Plymouth, UK in the Western English Channel over the period of February 2011–March 2012. Acetone concentrations ranged from 2–10 nM (nanomole/L) in surface waters with a maximum observed in summer. Concentrations correlated positively with net shortwave radiation and UV light, suggestive of photochemically linked acetone production. We observed a clear decline in acetone concentrations below the mixed layer. Acetaldehyde varied between 4–37 nM in surface waters with higher values observed in autumn and winter. Surface concentrations of methanol ranged from 16–78 nM, but no clear annual cycle was observed. Methanol concentrations exhibited considerable inter-annual variability. We estimate consistent deposition to the sea surface for acetone and methanol but that the direction of the acetaldehyde flux varies during the year.

Item Type: Publication - Article
Additional Keywords: Oxygenated volatile organic compounds (OVOCs); Methanol; Acetone; Acetaldehyde; Seasonality; Western English Channel; In-situ measurements; Vertical profiles; Air–sea transfer
Subjects: Chemistry
Divisions: Plymouth Marine Laboratory > Science Areas > Marine Biochemistry and Observations
Depositing User: Professor Philip Nightingale
Date made live: 10 Aug 2015 15:15
Last Modified: 09 Nov 2018 11:50

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