 |
| Titel |
Evaluation of a new JMA aircraft flask sampling system and laboratory trace gas analysis system |
| VerfasserIn |
K. Tsuboi, H. Matsueda, Y. Sawa, Y. Niwa, M. Nakamura, D. Kuboike, K. Saito, H. Ohmori, S. Iwatsubo, H. Nishi, Y. Hanamiya, K. Tsuji, Y. Baba |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1867-1381
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 6, no. 5 ; Nr. 6, no. 5 (2013-05-15), S.1257-1270 |
| Datensatznummer |
250017892
|
| Publikation (Nr.) |
 copernicus.org/amt-6-1257-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| We established and evaluated a flask air sampling system on
a cargo C-130H aircraft, as well as a trace gas measurement system for the
flask samples, as part of a new operational monitoring program of the Japan
Meteorological Agency (JMA). Air samples were collected during each flight,
between Kanagawa Prefecture (near Tokyo) and Minamitorishima (an island
located nearly 2000 km southeast of Tokyo), from the air-conditioning
system on the aircraft. Prior to the operational employment of the sampling
system, a quality assurance test of the sampled air was made by specially
coordinated flights at a low altitude of 1000 ft over Minamitorishima and
comparing the flask values with those obtained at the surface. Based on our
storage tests, the flask samples remained nearly stable until analyses. The
trace gas measurement system has, in addition to the nondispersive infrared
(NDIR) and vacuum ultraviolet resonance fluorescence (VURF) analyzers, two
laser-based analyzers using wavelength-scanned cavity ring-down spectroscopy
(WS-CRDS) and off-axis integrated cavity output spectroscopy (ICOS).
Laboratory tests of the laser-based analyzers for measuring flask samples
indicated relatively high reproducibility with overall precisions of less
than ±0.06 ppm for CO2, ±0.68 ppb for CH4, ±0.36 ppb
for CO, and ±0.03 ppb for N2O. Flask air sample
measurements, conducted concurrently on different analyzers were compared.
These comparisons showed a negligible bias in the averaged measurements
between the laser-based measurement techniques and the other methods
currently in use. We also estimated that there are no significant isotope
effects for CH4, CO and N2O using standard gases with industrial
isotopic compositions to calibrate the laser-based analyzers, but CO2
was found to possess isotope effects larger than its analytical precision. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|