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Transient Response for Isotopic CO2 Whitepaper

Stable isotope analysis relies on the simultaneous or near-simultaneous measurement of two individual species. In the case of the Picarro G1101-i and G2101-i gas analyzers, these two species are 12C16O2 and 13C16O2, which we denote 12C and 13C for simplicity. In the G1101-i, alternate measurements of 12C and 13C are made with a period of about eight seconds; the fact that the two gas measurements are not made simultaneously leads to systematic errors in the reported delta in certain conditions when the gas concentration is varying significantly. In this white paper, we report on improvements that we have made in the G2101-i to reduce these systematic errors by more than a factor of eight.

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