Development of a new high precision continuous measuring system for atmospheric O2/N2 and Ar/N2 and its application to the observation in Tsukuba, Japan
A high precision continuous measurement system has been developed for analysis of the atmospheric O2/N2 and Ar/N2 ratios based on a mass spectrometry method. Sample and reference air flows through an inlet system and only a miniscule amount of each is transferred to the ion source of the mass spectr...
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| Format: | Article |
| Language: | English |
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Stockholm University Press
2014-01-01
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| Series: | Tellus: Series B, Chemical and Physical Meteorology |
| Subjects: | |
| Online Access: | http://www.tellusb.net/index.php/tellusb/article/download/22574/pdf_1 |
| _version_ | 1818475377063886848 |
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| author | Shigeyuki Ishidoya Shohei Murayama |
| author_facet | Shigeyuki Ishidoya Shohei Murayama |
| author_sort | Shigeyuki Ishidoya |
| collection | DOAJ |
| description | A high precision continuous measurement system has been developed for analysis of the atmospheric O2/N2 and Ar/N2 ratios based on a mass spectrometry method. Sample and reference air flows through an inlet system and only a miniscule amount of each is transferred to the ion source of the mass spectrometer through thermally insulated thin fused silica capillaries. The measured O2/N2 and Ar/N2 values are experimentally corrected for the effects of pressure imbalance between the sample air and reference air during their introduction into the mass spectrometer, as well as for the influence of CO2 concentration and O2/N2 ratio of the sample air. Standard deviations of the measured O2/N2 and Ar/N2 ratios of standard air are ±3.2 and ±6.5 per meg, respectively, for our normal measurement time of 62 seconds. Our standard air is prepared by drying natural air and then stored in 48-L high-pressure cylinders; its O2/N2 and Ar/N2 ratios are stable to within ±1.1 and ±5.8 per meg, respectively, over a period of 11 months. The CO2/N2 ratio is also simultaneously measured by this system, and converted to CO2 concentration with a precision better than ±0.3 ppm using an experimentally determined relationship. This system has been field tested in Tsukuba, Japan since February 2012. Preliminary results show clear seasonal cycles of atmospheric potential oxygen (APO=O2 +1.1×CO2), as well as of Ar/N2. If we ignore the fossil fuel influence, then that part the seasonal APO cycle driven by the air–sea heat flux accounts for 23% of the observed seasonal APO cycle, as estimated from the seasonal cycle of Ar/N2; any residuals are attributed to ocean biology and ventilation. |
| first_indexed | 2024-12-10T09:11:45Z |
| format | Article |
| id | doaj.art-9e2c5a789ca246b3b40b485e40cfb100 |
| institution | Directory Open Access Journal |
| issn | 1600-0889 |
| language | English |
| last_indexed | 2024-12-10T09:11:45Z |
| publishDate | 2014-01-01 |
| publisher | Stockholm University Press |
| record_format | Article |
| series | Tellus: Series B, Chemical and Physical Meteorology |
| spelling | doaj.art-9e2c5a789ca246b3b40b485e40cfb1002022-12-22T01:55:00ZengStockholm University PressTellus: Series B, Chemical and Physical Meteorology1600-08892014-01-0166011510.3402/tellusb.v66.2257422574Development of a new high precision continuous measuring system for atmospheric O2/N2 and Ar/N2 and its application to the observation in Tsukuba, JapanShigeyuki Ishidoya0Shohei Murayama1National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8569, JapanNational Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8569, JapanA high precision continuous measurement system has been developed for analysis of the atmospheric O2/N2 and Ar/N2 ratios based on a mass spectrometry method. Sample and reference air flows through an inlet system and only a miniscule amount of each is transferred to the ion source of the mass spectrometer through thermally insulated thin fused silica capillaries. The measured O2/N2 and Ar/N2 values are experimentally corrected for the effects of pressure imbalance between the sample air and reference air during their introduction into the mass spectrometer, as well as for the influence of CO2 concentration and O2/N2 ratio of the sample air. Standard deviations of the measured O2/N2 and Ar/N2 ratios of standard air are ±3.2 and ±6.5 per meg, respectively, for our normal measurement time of 62 seconds. Our standard air is prepared by drying natural air and then stored in 48-L high-pressure cylinders; its O2/N2 and Ar/N2 ratios are stable to within ±1.1 and ±5.8 per meg, respectively, over a period of 11 months. The CO2/N2 ratio is also simultaneously measured by this system, and converted to CO2 concentration with a precision better than ±0.3 ppm using an experimentally determined relationship. This system has been field tested in Tsukuba, Japan since February 2012. Preliminary results show clear seasonal cycles of atmospheric potential oxygen (APO=O2 +1.1×CO2), as well as of Ar/N2. If we ignore the fossil fuel influence, then that part the seasonal APO cycle driven by the air–sea heat flux accounts for 23% of the observed seasonal APO cycle, as estimated from the seasonal cycle of Ar/N2; any residuals are attributed to ocean biology and ventilation.www.tellusb.net/index.php/tellusb/article/download/22574/pdf_1atmospheric O2/N2 ratioatmospheric Ar/N2 ratiocontinuous measurementsmass spectrometerseasonal cycle of Ar/N2 ratio |
| spellingShingle | Shigeyuki Ishidoya Shohei Murayama Development of a new high precision continuous measuring system for atmospheric O2/N2 and Ar/N2 and its application to the observation in Tsukuba, Japan Tellus: Series B, Chemical and Physical Meteorology atmospheric O2/N2 ratio atmospheric Ar/N2 ratio continuous measurements mass spectrometer seasonal cycle of Ar/N2 ratio |
| title | Development of a new high precision continuous measuring system for atmospheric O2/N2 and Ar/N2 and its application to the observation in Tsukuba, Japan |
| title_full | Development of a new high precision continuous measuring system for atmospheric O2/N2 and Ar/N2 and its application to the observation in Tsukuba, Japan |
| title_fullStr | Development of a new high precision continuous measuring system for atmospheric O2/N2 and Ar/N2 and its application to the observation in Tsukuba, Japan |
| title_full_unstemmed | Development of a new high precision continuous measuring system for atmospheric O2/N2 and Ar/N2 and its application to the observation in Tsukuba, Japan |
| title_short | Development of a new high precision continuous measuring system for atmospheric O2/N2 and Ar/N2 and its application to the observation in Tsukuba, Japan |
| title_sort | development of a new high precision continuous measuring system for atmospheric o2 n2 and ar n2 and its application to the observation in tsukuba japan |
| topic | atmospheric O2/N2 ratio atmospheric Ar/N2 ratio continuous measurements mass spectrometer seasonal cycle of Ar/N2 ratio |
| url | http://www.tellusb.net/index.php/tellusb/article/download/22574/pdf_1 |
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