Filchner Ice Shelf cavity noble gas (helium and neon) measurements ...

To obtain noble gas samples from the water column below an ice shelf, we have constructed a new gas-tight in-situ water sampler to prevent the water samples from the sub-glacial cavity from gas-fractionation and degassing due to freezing and expansion. The novel instrument contains a degreased soft...

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Bibliographic Details
Main Authors: Huhn, Oliver, Hattermann, Tore, Davis, Peter, Dunker, Erich, Hellmer, Hartmut H, Nicholls, Keith W, Østerhus, Svein, Rhein, Monika, Schröder, Michael, Sültenfuß, Jürgen
Format: Dataset
Language:English
Published: PANGAEA 2017
Subjects:
CTD
Online Access:https://dx.doi.org/10.1594/pangaea.883808
https://doi.pangaea.de/10.1594/PANGAEA.883808
Description
Summary:To obtain noble gas samples from the water column below an ice shelf, we have constructed a new gas-tight in-situ water sampler to prevent the water samples from the sub-glacial cavity from gas-fractionation and degassing due to freezing and expansion. The novel instrument contains a degreased soft copper tube (diameter 10 mm, length 90 cm) allowing a sea-water sample of ~44 g as usually used for oceanic noble gas samples. Both ends are connected with high pressure ball valves with gas-tight swagelok© connectors to it at both ends. Additional intake and outtake funnels extend the tube at both ends of the sampling device to increase the water flux for flushing and rinsing the copper tube. The instrument is mounted in an aluminum cylinder (diameter 100 mm, length 1510 mm, weight 8 kg) to protect it while it is moved through the bore hole (diameter approx. 250 mm). The instrument is lowered through the bore hole into the water underneath the ice shelf on a 3.25 mm wire together with a CTD measuring continuously ...