Physics
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980georl...7..341z&link_type=abstract
Geophysical Research Letters, vol. 7, May 1980, p. 341-344.
Physics
4
Atmospheric Composition, Equatorial Atmosphere, Formaldehyde, Marine Environments, Rain, Remote Regions, Troposphere, Air Water Interactions, Carbon, Chemical Analysis, Gas Composition, Methane, Ocean Surface, Oxidation, Pacific Ocean, Trace Elements
Scientific paper
The tropospheric trace constituent formaldehyde, HCHO, was measured in rain and in the gas phase during the wet season at Enewetak Atoll, a remote marine site in the central equatorial Pacific. Rainwater averaged 8 + or - 2 microgram/kg; the gas phase averaged 0.4 + or 0.2 ppbv (0.5 microgram/cu m). These values, especially the rain, are among the lowest reported to date. The formaldehyde flux to the sea by rainout and washout extrapolates to 0.010 g/sq m per year. The gaseous flux into the sea surface is estimated to be 0.05 g/sq m per year by an air-sea exchange calculation that takes into account enhanced uptake by hydroxide-catalyzed formaldehyde hydration. The measured mixing ratio is close to the 0.18 ppbv prediction of a tropospheric chemistry model calculation. The methane oxidation chain probably is the sole formaldehyde source in the Enewetak area. The total formaldehyde flux as carbon into the ocean is approximately 2% of the estimated total organic carbon from rainout and washout. About 2-4% of the calculated column formaldehyde production is removed from the atmosphere by these processes.
Alford Jennifer
Gagosian Robert B.
Herrera Mark
Liu Char-Shine
Peltzer Edward T.
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