Recent improvements on atmospheric CO2 measurements at Mt. Cimone observatory, Italy
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Continuous atmospheric CO2 measurements have been carried out at Mt. Cimone from 1979 up to the present. Omitting here a measurement presentation, in this paper we show the current experimental procedures adopted and NDIR apparatus performances. Quality measurements have been recently improved by introducing an ULTRAMAT-5E (SIEMENS) NDIR analyzer controlled, for operating mode, by computer: the routine precision attained is ±0.1 p.p.m. An interesting performance of the analyzer is its nondetectable sensitivity to water vapour infrared absorption, enabling us also to determine CO2 measurements in wet air. A flask sampling technique and an investigation of the flask deterioration risk, against storing time, are presented. Results of the investigation validate the use of electropolished stainless-steel flasks for high-quality measurements.
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