2018
DOI: 10.5194/amt-2018-187
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Calibration of isotopologue-specific optical trace gas analysers: A practical guide

Abstract: Abstract. The isotopic composition of atmospheric trace gases such as CO2 and CH4 provides a valuable tracer for the sources and sinks that contribute to atmospheric trace gas budgets. In the past, isotopic composition has typically been measured with high precision and accuracy by Isotope Ratio Mass Spectrometry (IRMS) offline and separately from real-time or flask-based measurements of concentrations or mole fractions. In recent years, development of infrared optical spectroscopic techniques based on laser a… Show more

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“…Laser spectrometers require regular calibrations for accurate measurements of the concentration or isotopic composition of the target species. Griffith (2018) gives an excellent overview of suitable calibration procedures stating that conceptually, two effects need to be addressed by calibration: 1) the dependence of the δ-values on mole fractions and 2) the span calibration, or, the calibration of the isotopic against a reference standard. δ-flux measurements do not require high accuracy but mainly need high precision, because detrended fluctuations in δ-values are used to derive the 30 minute δ-flux (Eq.…”
Section: Calibrationsmentioning
confidence: 99%
“…Laser spectrometers require regular calibrations for accurate measurements of the concentration or isotopic composition of the target species. Griffith (2018) gives an excellent overview of suitable calibration procedures stating that conceptually, two effects need to be addressed by calibration: 1) the dependence of the δ-values on mole fractions and 2) the span calibration, or, the calibration of the isotopic against a reference standard. δ-flux measurements do not require high accuracy but mainly need high precision, because detrended fluctuations in δ-values are used to derive the 30 minute δ-flux (Eq.…”
Section: Calibrationsmentioning
confidence: 99%