open access

https://hdl.handle.net/2115/10510

In situ measurement of isoprene in the marine air and surface seawater from the western North Pacific

英語

liquid CO2

2002-12

Elsevier

Atmospheric Environment

36(39-40)

6051-6057

Isoprene (2-methyl-1,3-butadiene) was measured on board of R/V Mirai for eight air samples and fourteen seawater samples collected in the western North Pacific during ACE-Asia campaign (from May 18 to May 26, 2001). The measurements were conducted 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 the seawater. Based on these results, sea-to-air emissions of isoprene were calculated to be from 16.4 to 24.6 nmol m-2 day-1. The upper limits of the emission rates were also calculated to be from 3.2 to 30.4 nmol m-2 day-1. Atmospheric isoprene concentrations cannot be explained only by the emission from the seawater. Thus the concentrations of isoprene in the marine air in western North Pacific should be significantly affected by terrestrial vegetational emission and subsequent long-range atmospheric transport of isoprene.

学術雑誌論文

Accepted Manuscript

13522310