An integrated flask sample collection system for greenhouse gas measurements
| Autor: | J. Turnbull, D. Guenther, A. Karion, C. Sweeney, E. Anderson, A. Andrews, J. Kofler, N. Miles, T. Newberger, S. Richardson, P. Tans |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Atmospheric Measurement Techniques, Vol 5, Iss 9, Pp 2321-2327 (2012) |
| Druh dokumentu: | article |
| ISSN: | 2321-2012 1867-1381 1867-8548 |
| DOI: | 10.5194/amt-5-2321-2012 |
| Popis: | A one hour integrated flask sampling system to collect air in automated NOAA/ESRL 12-flask packages is described. The integrating compressor system uses a mass flow controller to regulate the flow of air through a 15 l volume, thus providing a mixture of air collected over an hour-long period. By beginning with a high flow rate of 3.8 standard liters per minute and gradually decreasing the flow rate over time to 0.29 standard liters per minute it is possible to obtain a nearly uniformly time averaged sample of air and collect it into a pressurized 0.7 l flask. The weighting function determining the air mixture obtained is described in detail. Laboratory and field tests demonstrate that the integrated sample approximates a simple mean of air collected during the one-hour sampling time. |
| Databáze: | Directory of Open Access Journals |
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