In situ measurement of isoprene in the marine air and surface seawater from the western North Pacific
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Isoprene (2-methyl-1,3-butadiene) was measured on board of R/V Mirai foreight air samples and fourteen seawater samples collected in the western North Pacificduring ACE-Asia campaign (from May 18 to May 26, 2001). The measurements wereconducted in situ using a cryo focus/gas chromatography/mass spectrometry(Cryo/GC/MS). Concentrations of isoprene ranged from 7.2 to 111 parts-per-trillion(pptv) in the marine air, and ranged from below 1.2 pmol L-1 to 9.4 pmol L-1 in theseawater. Based on these results, sea-to-air emissions of isoprene were calculated to befrom 16.4 to 24.6 nmol m-2 day-1. The upper limits of the emission rates were alsocalculated to be from 3.2 to 30.4 nmol m-2 day-1. Atmospheric isoprene concentrationscannot be explained only by the emission from the seawater. Thus the concentrations ofisoprene in the marine air in western North Pacific should be significantly affected byterrestrial vegetational emission and subsequent long-range atmospheric transport ofisoprene.
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