μDirac: an autonomous instrument for halocarbon measurements
| Autor: | S. E. Yong, H. M. Newton, G. P. Mills, D. E. Oram, L. M. O'Brien, N. R. P. Harris, B. Gostlow, A. D. Robinson, J. A Pyle |
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| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Atmospheric Measurement Techniques, Vol 3, Iss 2, Pp 507-521 (2010) |
| Druh dokumentu: | article |
| ISSN: | 1867-1381 1867-8548 |
| DOI: | 10.5194/amt-3-507-2010 |
| Popis: | We describe a new instrument (μDirac) capable of measuring halocarbons in the atmosphere. Portability, power efficiency and autonomy were critical design requirements and the resulting instrument can be readily deployed unattended on a range of platforms: long duration balloon, aircraft, ship and ground-based stations. The instrument is a temperature programmed gas chromatograph with electron capture detector (GC-ECD). The design requirements led to μDirac being built in-house with several novel features. It currently measures a range of halocarbons (including short-lived tracers having biogenic and anthropogenic sources) with measurement precision relative standard deviations ranging from ± 1% (CCl4) to ± 9% (CH3I). The prototype instrument was first tested in 2005 and the instrument has been proved in the field on technically challenging aircraft and ground-based campaigns. Results from an aircraft and a ground-based deployment are described. |
| Databáze: | Directory of Open Access Journals |
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