Atmospheric oxidation pathways of propane and its by‐products: Acetone, acetaldehyde, and propionaldehyde

Rosado-Reyes, Claudette M.; Francisco, Joseph S.

doi:10.1029/2006jd007566

Cited by 29 publications

(28 citation statements)

References 60 publications

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“…[2] It is well documented that oxygenated volatile organic compounds (OVOCs) are ubiquitous throughout the atmosphere, where they influence the tropospheric ozone budget via photochemical decomposition [Singh et al, 1995[Singh et al, , 2004Jacob et al, 2005]. Oxidation and photochemical degradation of these species consumes hydroxyl (OH) radicals and can also create hydrogen oxide radicals (HO x ) and stable trace gases, altering the oxidative capacity of the troposphere [Atkinson, 2000;Tie et al, 2003;Rosado-Reyes and Francisco, 2007]. The role of the ocean is a major uncertainty in the global source inventories of OVOCs.…”

Section: Introductionmentioning

confidence: 99%

Methanol, acetaldehyde, and acetone in the surface waters of the Atlantic Ocean

Beale

Dixon

Arnold

et al. 2013

J. Geophys. Res. Oceans

126

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[1] Oceanic methanol, acetaldehyde, and acetone concentrations were measured during an Atlantic Meridional Transect (AMT) cruise from the UK to Chile (49 N to 39 S) in 2009. Methanol (48-361 nM) and acetone (2-24 nM) varied over the track with enrichment in the oligotrophic Northern Atlantic Gyre. Acetaldehyde showed less variability (3-9 nM) over the full extent of the transect. These oxygenated volatile organic compounds (OVOCs) were also measured subsurface, with methanol and acetaldehyde mostly showing homogeneity throughout the water column. Acetone displayed a reduction below the mixed layer. OVOC concentrations did not consistently correlate with primary production or chlorophyll-a levels in the surface Atlantic Ocean. However, we did find a novel and significant negative relationship between acetone concentration and bacterial leucine incorporation, suggesting that acetone might be removed by marine bacteria as a source of carbon. Microbial turnover of both acetone and acetaldehyde was confirmed. Modeled atmospheric data are used to estimate the likely air-side OVOC concentrations. The direction and magnitude of air-sea fluxes vary for all three OVOCs depending on location. We present evidence that the ocean may exhibit regions of acetaldehyde under-saturation. Extrapolation suggests that the Atlantic Ocean represents an overall source of these OVOCs to the atmosphere at 3, 3, and 1 Tg yr À1 for methanol, acetaldehyde, and acetone, respectively.

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Section: Introductionmentioning

confidence: 99%

Methanol, acetaldehyde, and acetone in the surface waters of the Atlantic Ocean

Beale

Dixon

Arnold

et al. 2013

J. Geophys. Res. Oceans

126

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“…Methanol is primarily destroyed in the troposphere by reaction with the hydroxyl radical (OH), forming formaldehyde and reactive hydrogen radicals (HO 2 ) (Warneke et al, 1999). The oxidation of acetaldehyde also produces formaldehyde and hydrogen radicals as well as the stable by-product peroxyacetyl nitrate (PAN), which is involved in sequestering reactive nitrogen (Rosado-Reyes and Francisco, 2007). Acetone undergoes oxidation to form hydroperoxide, which in turn forms methyl glyoxal, acetaldehyde and formaldehyde.…”

Section: Introductionmentioning

confidence: 99%

Annual study of oxygenated volatile organic compounds in UK shelf waters

2015

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a b s t r a c tWe 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.

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“…Direct emissions at the surface are the only sources of ethane and propane to the atmosphere 1,2 , and several studies suggest that they are underestimated in global inventories 1,[3][4][5][6][7] . A major source of uncertainty is that these inventories first calculate total non-methane hydrocarbon (NMHC) emissions and then disaggregate them into individual species (ethane, propane, etc.)…”

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confidence: 99%