Water stable isotope record of ice core NEEM (early Holocene) measured with Continuous Flow Analysis ...

• Main Authors: Gkinis, Vasileios, Popp, Trevor, Blunier, Thomas, Bigler, Matthias, Schüpbach, Simon, Kettner, E, Johnsen, Sigfús Jóhann
• Format: Dataset
• Language: English
• Published: PANGAEA 2018
• Subjects: DEPTH, ice/snow; δ18O, water; δ Deuterium; Ice drill; ice core
• Online Access: https://dx.doi.org/10.1594/pangaea.886041; https://doi.pangaea.de/10.1594/PANGAEA.886041

A new technique for on-line high resolution isotopic analysis of liquid water, tailored for ice core studies is presented. We built an interface between a Wavelength Scanned Cavity Ring Down Spectrometer (WS-CRDS) purchased from Picarro Inc. and a Continuous Flow Analysis (CFA) system. The system offers the possibility to perform simultaneuous water isotopic analysis of d18O and dD on a continuous stream of liquid water as generated from a continuously melted ice rod. Injection of sub µl amounts of liquid water is achieved by pumping sample through a fused silica capillary and instantaneously vaporizing it with 100% efficiency in a~home made oven at a temperature of 170 °C. A calibration procedure allows for proper reporting of the data on the VSMOW-SLAP scale. We apply the necessary corrections based on the assessed performance of the system regarding instrumental drifts and dependance on the water concentration in the optical cavity. The melt rates are monitored in order to assign a depth scale to the ... : Water stable isotopes measured with a Picarro 1102 coupled to a CFA system with a 0.5 cm resolution. An early Holocene section with an age around 10900 years BP. ...