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| Titel |
Calibration of atmospheric hydrogen measurements |
| VerfasserIn |
A. Jordan, B. Steinberg |
| 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. 3 ; Nr. 4, no. 3 (2011-03-11), S.509-521 |
| Datensatznummer |
250001799
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| Publikation (Nr.) |
 copernicus.org/amt-4-509-2011.pdf |
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| Zusammenfassung |
| Interest in atmospheric hydrogen (H2) has been growing in recent years
with the prospect of H2 being a potential alternative to fossil fuels
as an energy carrier. This has intensified research for a quantitative
understanding of the atmospheric hydrogen cycle and its total budget,
including the expansion of the global atmospheric measurement network.
However, inconsistencies in published observational data constitute a major
limitation in exploring such data sets. The discrepancies can be mainly
attributed to difficulties in the calibration of the measurements. In this
study various factors that may interfere with accurate quantification of
atmospheric H2 were investigated including drifts of standard gases in
high pressure cylinders. As an experimental basis a procedure to generate
precise mixtures of H2 within the atmospheric concentration range was
established. Application of this method has enabled a thorough linearity
characterization of the commonly used GC-HgO reduction detector. We
discovered that the detector response was sensitive to the composition of
the matrix gas. Addressing these systematic errors, a new calibration scale
has been generated defined by thirteen standards with dry air mole fractions
ranging from 139–1226 nmol mol−1. This new scale has been accepted as
the official World Meteorological Organisation's (WMO) Global Atmospheric
Watch (GAW) H2 mole fraction scale. |
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