Revised methodology for CO<sub>2</sub> and CH<sub>4</sub> measurements at remote sites using a working standard-gas-saving system
<p>We have revised a calculation method of mole fractions and uncertainties for in situ CO<span class="inline-formula"><sub>2</sub></span> and CH<span class="inline-formula"><sub>4</sub></span> measurements with a working stan...
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Copernicus Publications
2025-04-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | https://amt.copernicus.org/articles/18/1717/2025/amt-18-1717-2025.pdf |
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| author | M. Sasakawa N. Tsuda T. Machida M. Arshinov D. Davydov A. Fofonov B. Belan |
| author_facet | M. Sasakawa N. Tsuda T. Machida M. Arshinov D. Davydov A. Fofonov B. Belan |
| author_sort | M. Sasakawa |
| collection | DOAJ |
| description | <p>We have revised a calculation method of mole fractions and uncertainties for in situ CO<span class="inline-formula"><sub>2</sub></span> and CH<span class="inline-formula"><sub>4</sub></span> measurements with a working standard-gas-saving system. It uses on-site compressed air to track the baseline drift of sensors. The Japan–Russia Siberian Tall Tower Inland Observation Network (JR-STATION) is made up of this system, which was installed across nine different sites in Siberia. The system acquires semi-continuous data by alternating between sampling air from multiple altitudes through switched flow paths and recording several minutes of averaged data for each altitude. We estimated the sensor repeatability (<span class="inline-formula"><i>u</i><sub>r</sub></span>) based on the measurement of on-site compressed air. The <span class="inline-formula"><i>u</i><sub>r</sub></span> for CO<span class="inline-formula"><sub>2</sub></span> and CH<span class="inline-formula"><sub>4</sub></span> was mostly around 0.05 ppm and below 5 ppb, respectively. The combined standard uncertainties <span class="inline-formula">(<i>u</i><sub>c</sub>(<i>x</i>))</span> of time-averaged ambient air measurements were sometimes higher than the <span class="inline-formula"><i>u</i><sub>r</sub></span> for each period because the data included atmospheric variability during the measurement period of several minutes. Data users should consider the difference between the <span class="inline-formula"><i>u</i><sub>r</sub></span> and <span class="inline-formula"><i>u</i><sub>c</sub>(<i>x</i>)</span> to select optimal data, depending on their focusing spatial scale. The CO<span class="inline-formula"><sub>2</sub></span> and CH<span class="inline-formula"><sub>4</sub></span> data measured with a non-dispersive infrared (NDIR) analyzer and a tin dioxide sensor (TOS) exhibited good agreement with those measured by cavity ring-down spectroscopy (CRDS).</p> |
| format | Article |
| id | doaj-art-a2f95337b78d4ac48f76b1f451876ba0 |
| institution | DOAJ |
| issn | 1867-1381 1867-8548 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Measurement Techniques |
| spelling | doaj-art-a2f95337b78d4ac48f76b1f451876ba02025-08-20T03:14:46ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482025-04-01181717173010.5194/amt-18-1717-2025Revised methodology for CO<sub>2</sub> and CH<sub>4</sub> measurements at remote sites using a working standard-gas-saving systemM. Sasakawa0N. Tsuda1T. Machida2M. Arshinov3D. Davydov4A. Fofonov5B. Belan6Center for Global Environmental Research, Earth System Division, National Institute for Environmental Studies, Tsukuba, 305-8506, JapanGlobal Environmental Forum, Tsukuba, 305-0061, JapanCenter for Global Environmental Research, Earth System Division, National Institute for Environmental Studies, Tsukuba, 305-8506, JapanV.E. Zuev Institute of Atmospheric Optics, Russian Academy of Sciences, Siberian Branch, Tomsk, RussiaV.E. Zuev Institute of Atmospheric Optics, Russian Academy of Sciences, Siberian Branch, Tomsk, RussiaV.E. Zuev Institute of Atmospheric Optics, Russian Academy of Sciences, Siberian Branch, Tomsk, RussiaV.E. Zuev Institute of Atmospheric Optics, Russian Academy of Sciences, Siberian Branch, Tomsk, Russia<p>We have revised a calculation method of mole fractions and uncertainties for in situ CO<span class="inline-formula"><sub>2</sub></span> and CH<span class="inline-formula"><sub>4</sub></span> measurements with a working standard-gas-saving system. It uses on-site compressed air to track the baseline drift of sensors. The Japan–Russia Siberian Tall Tower Inland Observation Network (JR-STATION) is made up of this system, which was installed across nine different sites in Siberia. The system acquires semi-continuous data by alternating between sampling air from multiple altitudes through switched flow paths and recording several minutes of averaged data for each altitude. We estimated the sensor repeatability (<span class="inline-formula"><i>u</i><sub>r</sub></span>) based on the measurement of on-site compressed air. The <span class="inline-formula"><i>u</i><sub>r</sub></span> for CO<span class="inline-formula"><sub>2</sub></span> and CH<span class="inline-formula"><sub>4</sub></span> was mostly around 0.05 ppm and below 5 ppb, respectively. The combined standard uncertainties <span class="inline-formula">(<i>u</i><sub>c</sub>(<i>x</i>))</span> of time-averaged ambient air measurements were sometimes higher than the <span class="inline-formula"><i>u</i><sub>r</sub></span> for each period because the data included atmospheric variability during the measurement period of several minutes. Data users should consider the difference between the <span class="inline-formula"><i>u</i><sub>r</sub></span> and <span class="inline-formula"><i>u</i><sub>c</sub>(<i>x</i>)</span> to select optimal data, depending on their focusing spatial scale. The CO<span class="inline-formula"><sub>2</sub></span> and CH<span class="inline-formula"><sub>4</sub></span> data measured with a non-dispersive infrared (NDIR) analyzer and a tin dioxide sensor (TOS) exhibited good agreement with those measured by cavity ring-down spectroscopy (CRDS).</p>https://amt.copernicus.org/articles/18/1717/2025/amt-18-1717-2025.pdf |
| spellingShingle | M. Sasakawa N. Tsuda T. Machida M. Arshinov D. Davydov A. Fofonov B. Belan Revised methodology for CO<sub>2</sub> and CH<sub>4</sub> measurements at remote sites using a working standard-gas-saving system Atmospheric Measurement Techniques |
| title | Revised methodology for CO<sub>2</sub> and CH<sub>4</sub> measurements at remote sites using a working standard-gas-saving system |
| title_full | Revised methodology for CO<sub>2</sub> and CH<sub>4</sub> measurements at remote sites using a working standard-gas-saving system |
| title_fullStr | Revised methodology for CO<sub>2</sub> and CH<sub>4</sub> measurements at remote sites using a working standard-gas-saving system |
| title_full_unstemmed | Revised methodology for CO<sub>2</sub> and CH<sub>4</sub> measurements at remote sites using a working standard-gas-saving system |
| title_short | Revised methodology for CO<sub>2</sub> and CH<sub>4</sub> measurements at remote sites using a working standard-gas-saving system |
| title_sort | revised methodology for co sub 2 sub and ch sub 4 sub measurements at remote sites using a working standard gas saving system |
| url | https://amt.copernicus.org/articles/18/1717/2025/amt-18-1717-2025.pdf |
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