High resolution water isotope data from ice cores ...
Abstract: We here present a new technique for the measurement of water isotope ratios in an online fashion using Cavity Ring Down spectroscopy in the Near Infra-Red region. The technique reaches a level of precision comparable or better to what can be achieved with traditional Mass Spectrometry achi...
| Published in: | American Journal of Botany |
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| Main Author: | |
| Format: | Text |
| Language: | English |
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Zenodo
2011
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.5281/zenodo.5653088 https://zenodo.org/record/5653088 |
| Summary: | Abstract: We here present a new technique for the measurement of water isotope ratios in an online fashion using Cavity Ring Down spectroscopy in the Near Infra-Red region. The technique reaches a level of precision comparable or better to what can be achieved with traditional Mass Spectrometry achieving very low instrumental drifts. Attached to an ice core melter the system can offer water isotope measurements of unprecedented resolution. We demonstrate the feasibility of the technique by deploying the system on the Greenland ice sheet during the NEEM ice core project. The online nature of the data calls for a different approach regarding data analysis. We outline the methods we use in order to put the water isotope time series on a depth scale. Based on a step response analysis we are able to derive transfer functions that describe the attenuation of signals with different wavelengths. Allan variance analysis is also used to assess the precision and long term stability of the analytical system. Results are ... |
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