Abstract
Biogenic volatile organic compounds emitted from the ocean are known to play an important role in the marine atmospheric chemistry. In this study, we investigated diurnal variations of isoprene, DMS and methyl iodide in the atmosphere, based on the high frequency VOC monitoring at Hateruma Island(24.1ºN, 123.8ºE). Isoprene in the marine atmosphere was found to be greatly reduced at mid-day. Such a diurnal variation of isoprene was completely different from those observed in the terrestrial forests. DMS and methyl iodide did not show so significant diurnal change as isoprene.
