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Yamagishi, H. ., National Institute for Environmental Studies, Tsukuba, Japan, yamagishi.hiroaki@nies.go.jp
Tohjima, Y. ., National Institute for Environmental Studies, Tsukuba, Japan, tohjima@nies.go.jp
Mukai, H. ., National Institute for Environmental Studies, Tsukuba, Japan, lnmukaih@nies.go.jp
Nojiri, Y. ., National Institute for Environmental Studies, Tsukuba, Japan, nojiri@nies.go.jp
Miyazaki, C. ., National Institute for Environmental Studies, Tsukuba, Japan, miyazaki.chihiro@nies.go.jp
Katsumata, K. ., National Institute for Environmental Studies, Tsukuba, Japan, katsumata.keiichi@nies.go.jp

OBSERVATION OF ATMOSPHERIC OXYGEN/NITROGEN RATIO ON BOARD A CARGO SHIP BY USING GAS CHROMATOGRAPHY/THERMAL CONDUCTIVITY DETECTOR

Measurements of atmospheric O2/N2 ratio and CO2 concentration have been used to analyze the -ΔO2/ΔCO2 ratio to obtain information on CO2 sources, e.g. anthropogenic or terrestrial biogenic sources (respiration or wildfire). In this study we report on the development of a shipboard system for measuring atmospheric O2/N2 ratio by using the gas chromatography/thermal conductivity detector (GC/TCD) technique. The standard error for a one hour average (N = 6) is found to be ~5 per meg (~1 ppm). The shipboard measurements have been conducted since the end of September 2007 on TRANS FUTURE 5, a cargo ship sailing between Japan, Australia, and New Zealand every six weeks. Spatially, the observation covers latitudes between 41°S and 33°N over the western Pacific. Air masses with high CO2 concentration are observed along the coastline of Australia and New Zealand. In more than two thirds of the cases (17 of 23 events) detected between September 2007 and July 2009, values of the -ΔO2/ΔCO2 ratio are less than 1.15, indicating dominance of biogenic sources (e.g. respiration or wildfire) of CO2.

Poster presentation

Session #:001
Date: 2/21/2012
Time: 14:00 - 16:00
Location: Poster/Exhibit Hall

Presentation is given by student: No

PosterID: B1539