1999 Fiscal Year Final Research Report Summary
Development of a high precision measurement system for atmospheric oxygen concentration
| Project/Area Number |
10554021
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
AOKI Shuji Graduate School of Science, Tohoku University, Associate Professor, 大学院・理学研究科, 助教授 (00183129)
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| Co-Investigator(Kenkyū-buntansha) |
OHORI Motoki Technical Research Section, Thermo Quest Co. Ltd., Chief, 技術開発部, 主任研究員
NAKAZAWA Takakiyo Graduate School of Science, Tohoku University, Professor, 大学院・理学研究科, 教授 (30108451)
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| Project Period (FY) |
1998 – 1999
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| Keywords | oxygen / high precision / measurement system / mass spectrometer / standard gases / 標準誤差 |
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| Research Abstract |
A high precision measurement system of atmospheric oxygen concentration has been developed by the research project. The system consisted mainly of a detector, double inlets made of pyrex glass, a high precision pressure adjuster and a computer. A mass spectrometer of the Nier-McKinney type was selected for the detector of the system. The fused-silica-capillaries of 25mm I.d. and 1.35m length were used for connection between the double inlets and the detector. Air samples could be introduced into the inlet at an atmospheric pressure by the capillary. We confirmed that fractionation of air components did not occurred in the capillary. We found that oxygen enrichment occurred at a part of lower temperature of airflow line. Therefore, the system was settled in our air-conditioned laboratory and the capillary with a very small heat capacity was covered by double insulation tubes. Isobaric interference for N2 due to the formation of CO from CO2 in the ion source of the mass spectrometer was a serious problem for the high precision measurements. An empirical formula for CO2 and O2 concentrations was established by an experiment for correction of the interference of air samples.
Standard gases for O2 measurements were prepared by ourselves. Natural air was collected and stored in a high-pressure cylinder through water vapor traps. Such a collection of large amount of air was made several times in different seasons to prepare standard gases of different O2 concentrations. To confirm stability of O2 concentration of these standards, we made mutual calibration between these standards for more than 1 years. As a result, all the standard gases were stable within +-20 per meg and any drift of O2 concentration could not observable.
The standard error of +-5.6 per meg for a sample analyzed in quadruplicate could be attained for the measurement system.
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[Publications] Wessel, S., Aoki, S., Weller, R., Winkler, P., Herber, A., Gernandt, H., and Schrems, O.: "Tropospheric ozone depletion in polar regions. A comparison of observations in the Arctic and Antarctic"Tellus 50B. 34-50 (1998)
Description
「研究成果報告書概要(欧文)」より
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[Publications] Aoki S., Nakazawa, T., Honda, H., Yajima, N., Machida, T., Sugawara, S., Kawamura, K., and Yoshimura, S.: "CO2, CH4 and N2O concentrations and δ13C in CO2 and CH4 in the stratosphere over Scandinavia and Japan"Proceedings of the 21st International Symposium on Space Technology and Science. Vol. II. 1568-1571 (1998)
Description
「研究成果報告書概要(欧文)」より
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[Publications] Shirai, T., Hirabayashi, M., Makide, Y., Aoki, S., Nakazawa, T., Honda, H. and Yajima, N.: "Vertical Distributions of Ozone-Depleting Halocarbons Over Sanriku (Japan) and Kiruna (Sweden) Obtained by Balloon-Borne Cryogenic Sampling Followed by GC/ECD and GC/MS Measurements in Laboratory"Proceedings of the 21st International Symposium on Space Technology and Science. Vol. II. 1562-1567 (1998)
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「研究成果報告書概要(欧文)」より
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[Publications] Yajima, N., Yamagami, T., Honda, H., Aoki, S., Nakazawa, T. and Kanzawa, H.: "Balloon Observations Synchronized with Earth Monitoring Satellite"Proceedings of the 21st International Symposium on Space Technology and Science. Vol. II. 1598-1603 (1998)
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「研究成果報告書概要(欧文)」より
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[Publications] Wessel, S., Herber, A., Gernandt, H., Aoki, S., Winkler, P., Weller, R. and Schrems, O.: "Irregular ozone depletion events in the Antarctic troposphere recorded at Neumayer Station in 1992 and 1993"Memoirs of National Institute of Polar Research Special Issue. No. 52. 89-101 (1998)
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「研究成果報告書概要(欧文)」より
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[Publications] Aoki, S., Azuma, N., Fuji, Y., Fujita, S., Furukawa, T., Hondoh, T., Kamiyama, K., Motoyama, H., Nakawo, M., Nakazawa, T., Narita, H., Satow, K., Shoji, H. and Watanabe, O.: "Preliminary investigation of palaeoclimate signals recorded in the ice core from Dome Fuji station east Dronning Maud Land"Antarctica, Annals of Glaciology. 27. 338-342 (1998)
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「研究成果報告書概要(欧文)」より
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[Publications] Yokouchi, Y., Li, H-J., Machida, T., Aoki, S., Akimoto, H.: "Isoprene in the marine boundary layer (Southeast Asian Sea, eastern Indian Ocean, and Southern Ocean) : Comparison with dimethyl sulfide and bromoform"J. Geophys. Res.. 104. 8067-8076 (1999)
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「研究成果報告書概要(欧文)」より
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[Publications] Yajima, N., Honda, H., Aoki, S., Hoshida, G., Morimoto, S., Machida, T. and Okano, S.: "Improved scientific ballooning applied to the cryo-sampling at Syowa Station"Adv. in Polar Upper Atmos. Res.. 13. 167-175 (1999)
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「研究成果報告書概要(欧文)」より
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[Publications] Yokouchi, Y., Nojiri, Y., Barrie, L. A., Toom-Saunty, D., Machida, T., Inuzuka, Y., Akimoto, H., Li, H-J., Fujinuma, Y. and Aoki, S.: "A strong source of methyl chloride to the atmosphere from tropical coastal land"Nature. 403. 295-298 (2000)
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「研究成果報告書概要(欧文)」より
