Results from the International Halocarbons in Air Comparison Experiment : (IHALACE) [Discussion paper]

  • The International Halocarbons in Air Comparison Experiment (IHALACE) was conducted to document relationships between calibration scales among various laboratories that measure atmospheric greenhouse and ozone depleting gases. Six stainless steel cylinders containing natural and modified natural air samples were circulated among 19 laboratories. Results from this experiment reveal relatively good agreement among commonly used calibration scales for a number of trace gases present in the unpolluted atmosphere at pmol mol−1 (parts per trillion) levels, such as chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), and hydrofluorocarbons (HFCs). Some scale relationships were found to be consistent with those derived from bi-lateral experiments or from analysis of atmospheric data, while others revealed discrepancies. The transfer of calibration scales among laboratories was found to be problematic in many cases, meaning that measurements tied to a common scale may not, in fact, be compatible. These results reveal substantial improvements in calibration over previous comparisons. However there is room for improvement in communication and coordination of calibration activities with respect to the measurement of halogenated and related trace gases.

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Author:Brad D. Hall, Andreas EngelORCiD, Jens MühleORCiDGND, James William ElkinsORCiD, Florinda Artuso, Elliot L. Atlas, Murat Aydin, Donald R. Blake, Ernst-Günther Brunke, Salvatore Chiavarini, Paul J. Fraser, James D. Happell, Paul B. KrummelORCiD, Ingeborg Levin, Max Loewenstein, Michela MaioneORCiD, Stephen A. MontzkaORCiD, Simon O'DohertyORCiD, Stefan ReimannORCiDGND, George J. Rhoderick, Eric S. Saltzman, Hans-Eckhart Scheel, L. Paul Steele, Martin K. VollmerORCiD, Ray F. WeissORCiD, Douglas E. Worthy, Yoko Yokouchi
Parent Title (English):Atmospheric measurement techniques discussions
Place of publication:Katlenburg-Lindau
Document Type:Article
Date of Publication (online):2013/08/30
Date of first Publication:2013/08/30
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2013/10/02
Page Number:25
First Page:8021
Last Page:8069
© Author(s) 2013. This work is distributed under the Creative Commons Attribution 3.0 License.
Institutes:Geowissenschaften / Geographie / Geowissenschaften
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 55 Geowissenschaften, Geologie / 550 Geowissenschaften
Licence (German):License LogoCreative Commons - Namensnennung 3.0