Atmos. Chem. Phys. Discuss., 8, 2225-2248, 2008
www.atmos-chem-phys-discuss.net/8/2225/2008/
doi:10.5194/acpd-8-2225-2008
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Detection of regional scale sea-to-air oxygen emission related to spring bloom near Japan by using in-situ measurements of atmospheric oxygen/nitrogen ratio
H. Yamagishi1, Y. Tohjima1, H. Mukai2, and K. Sasaoka3
1Atmospheric Environmental Division, National Institute for Environmental Studies, Tsukuba, Japan
2Center for Global Environmental Research, National Institute for Environmental Studies, Tsukuba, Japan
3Frontier Research Center for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan

Abstract. We have been carrying out in-situ monitoring of atmospheric O2/N2 ratio at Cape Ochi-ishi (COI; 43°10´ N, 145°30´ E) in the northern part of Japan since March 2005 by using a modified gas chromatography/thermal conductivity detector (GC/TCD). The standard deviation of the O2/N2 ratio is estimated to be about ±14 per meg (≈3 ppm) with intervals of 10 min. Thus, the in-situ measurement system has a 1σ precision of ±6 per meg ((≈1.2 ppm) for one-hour mean O2/N2 ratio. Atmospheric potential oxygen (APO ≈O2+1.1CO2), which is conserved with respect to terrestrial photosynthesis and respiration but reflects changes in air-sea O2 and CO2 fluxes, shows large variabilities from April to early July 2005. Distribution of satellite-derived marine primary production indicates occurrences of strong bloom in the Japan Sea in April and in the Okhotsk Sea and the western North Pacific near Hokkaido Island in June. Back trajectory analysis of air masses indicates that high values of APO, which last for several hours or several days, can be attributed to the oxygen emission associated with the spring bloom of active primary production.

Citation: Yamagishi, H., Tohjima, Y., Mukai, H., and Sasaoka, K.: Detection of regional scale sea-to-air oxygen emission related to spring bloom near Japan by using in-situ measurements of atmospheric oxygen/nitrogen ratio, Atmos. Chem. Phys. Discuss., 8, 2225-2248, doi:10.5194/acpd-8-2225-2008, 2008.
 
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