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| Titel |
Onboard measurement system of atmospheric carbon monoxide in the Pacific by voluntary observing ships |
| VerfasserIn |
H. Nara, H. Tanimoto, Y. Nojiri, H. Mukai, T. Machida, Y. Tohjima |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 4, no. 11 ; Nr. 4, no. 11 (2011-11-24), S.2495-2507 |
| Datensatznummer |
250002137
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| Publikation (Nr.) |
 copernicus.org/amt-4-2495-2011.pdf |
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| Zusammenfassung |
| Long-term monitoring of carbon monoxide (CO) mixing ratios in the atmosphere
over the Pacific Ocean is being carried out on commercial cargo vessels
participating in the National Institute for Environmental Studies Voluntary
Observing Ships program. The program provides a regular platform for
measurement of atmospheric CO along four cruise routes: from Japan to
Oceania, the United States, Canada, and Southeast Asia. Flask samples are
collected during every cruise for subsequent analysis in the laboratory, and
in 2005, continuous shipboard CO measurements were initiated on three of the
routes. Here, we describe the system we developed for onboard measurement of
CO mixing ratios with a commercially available gas filter correlation CO
analyzer. The fully automated system measures CO in ambient air, and the
detector sensitivity and background signals are calibrated by referencing
the measurements to a CO-in-air standard gas (~1 ppmv) and to CO-free
air scrubbed with a catalyst, respectively. We examined the artificial
production of CO in the high-pressure working gas standards during storage
by referencing the measurements to CO standard gases maintained as our
primary scale before and after use on the ships. The onboard performance of
the continuous CO measurement system was evaluated by comparing its data
with data from laboratory analyses of flask samples using gas chromatography
with a reduction gas detector. The reasonably good consistency between the
two independent measurement methods demonstrated the good performance of
both methods over the course of 3–5 years. The continuous measurement
system was more useful than the flask sampling method for regionally
polluted air masses, which were often encountered on Southeast Asian
cruises. |
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