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Titel |
Development of a Fast, High-Precision Analyzer for N2O and CO Measurements in Field Applications |
VerfasserIn |
Robert Provencal, Raymond Fellers, Thomas Owano, Yonggang He, Douglas Baer |
Konferenz |
EGU General Assembly 2010
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Medientyp |
Artikel
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Sprache |
Englisch
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 12 (2010) |
Datensatznummer |
250032872
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Zusammenfassung |
Accurate and precise measurements of both nitrous oxide and carbon monoxide concentrations are important in understanding global atmospheric chemistry. Because atmospheric mixing ratios of these species are small ( < 0.5 PPM), an analyzer designed to probe these species must have high sensitivity and high precision to make meaningful measurements. We report here the development of an analyzer based on our patented off-axis integrated cavity output spectroscopy (Off-Axis ICOS) which measures both CO and N2O concentrations with a 1-sigma precision of less than 0.3 ppb in 1 second. Without calibration the instrument is accurate to better than 1% over the temperature range of 15- 35C. Data rates of up to 10 Hz are achieved to allow for eddy flux correlation measurements. The instrument is low-power (~150 watts) and requires no liquid nitrogen, allowing for easy measurements in the field. |
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