Corrigendum to “Photochemical production of formaldehyde, acetaldehyde and acetone from chromophoric dissolved organic matter in coastal waters” [J. Photochem. Photobiol. A Chem. 226 (1) (2011) 16–22]

Chemistry and Release of Gases from the Surface Ocean

“…127 More recently, a series of photochemical experiments with beach waters showed that the addition of DMSO, a scavenger for • OH, led to a 30% reduction in acetaldehyde yield, indicating that, unlike acetone, 1 O 2 / • OH contributes to, but does not dominate, acetaldehyde production. 128 This conclusion was further supported by the observation that the addition of oxygen to water samples by de Bruyn and co-workers 128 did not result in an enhancement of acetaldehyde concentrations. Acetaldehyde production therefore appears to be dominated by the direct photolysis of CDOM.…”

“…However, irradiation of samples collected from beaches of the Californian coast found that production increased with added nitrate (a source of • OH, see Appendix 3) and with added oxygen. 128 Addition of DMSO, a scavenger for • OH, led to a large reduction in acetone yield, again indicative of • OH involvement in production. It seems likely that formation of acetone in coastal waters is predominantly via the reaction of singlet oxygen/ • OH, produced via the reaction of sunlight, photosensitizers, and DOM, 128 i.e., type II photosensitized reactions (see Appendix 3).…”

“…128 Addition of DMSO, a scavenger for • OH, led to a large reduction in acetone yield, again indicative of • OH involvement in production. It seems likely that formation of acetone in coastal waters is predominantly via the reaction of singlet oxygen/ • OH, produced via the reaction of sunlight, photosensitizers, and DOM, 128 i.e., type II photosensitized reactions (see Appendix 3). Reactions induced by 1 O 2 are favored in high DOM waters because DOM acts as a source of, but not as a sink for, 1 O 2 .…”

“…129 Such a production mechanism might support the large enhancements (18-fold) of acetone observed in the ssm compared to bulk waters of the open Atlantic Ocean, 28b and the high apparent quantum yields (AQY, see Appendix 3) of ∼4 × 10 −6 determined for near-shore waters. 128 However, it may not necessarily be the dominant photochemical production mechanism in the bulk waters of the open ocean, where DOM (and nitrate) levels are much reduced.…”

Wavelength- and Temperature-Dependent Apparent Quantum Yields for Photochemical Production of Carbonyl Compounds in the North Pacific Ocean

“…For comparison to de Bruyn et al, , our wavelength-dependent AQYs were converted to a polychromatic AQY from 290 to 400 nm of the form Calculated polychromatic AQYs (mean ± SD) were 9.2 ± 2.8 × 10 –6 , 1.4 ± 0.9 × 10 –6 , and 4.0 ± 1.9 × 10 –7 ) mol (mol quanta) −1 for acetaldehyde, glyoxal, and methylglyoxal photoproduction, respectively. de Bruyn et al (2011) , determined acetaldehyde polychromatic AQYs based on irradiation of coastal beach seawater with a solar simulator, and their 300–400 nm average AQYs for acetaldehyde was 2.77 × 10 –5 mol (mol quanta) −1 . Our AQYs were lower by a factor of 2–5, but this was expected since open oceans generally yield lower photochemical efficiencies compared to coastal or fresh water samples …”