Gypsum crystals observed in experimental and natural sea ice

Although gypsum has been predicted to precipitate in sea ice, it has never been observed. Here we provide the first report on gypsum precipitation in both experimental and natural sea ice. Crystals were identified by X-ray diffraction analysis. Based on their apparent distinguishing characteristics,...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Geilfus, Nicolas-Xavier, Galley, Ryan, Cooper, Marc, Halden, Norman, Hare, Alex, Wang, Fei, Søgaard, Dorte, Rysgaard, Søren
Format: Article in Journal/Newspaper
Language:English
Published: 2013
Subjects:
gypsum
sea ice
frezchem
ikaite
Sea ice
Online Access:https://pure.au.dk/portal/en/publications/9c896354-932e-455a-9821-19b0eb53dd1c
https://doi.org/10.1002/2013GL058479
https://pure.au.dk/ws/files/68062192/Geilfus_et_al_2013_Gypsum.pdf
Description
Summary:Although gypsum has been predicted to precipitate in sea ice, it has never been observed. Here we provide the first report on gypsum precipitation in both experimental and natural sea ice. Crystals were identified by X-ray diffraction analysis. Based on their apparent distinguishing characteristics, the gypsum crystals were identified as being authigenic. The FREeZing CHEMistry (FREZCHEM) model results support our observations of both gypsum and ikaite precipitation at typical in situ sea ice temperatures and confirms the “Gitterman pathway” where gypsum is predicted to precipitate. The occurrence of authigenic gypsum in sea ice during its formation represents a new observation of precipitate formation and potential marine deposition in polar seas. Citation: Geilfus, N.-X., R. J. Galley, M. Cooper, N. Halden, A. Hare, F. Wang, D. H. Søgaard, and S. Rysgaard (2013), Gypsum crystals observed in experimental and natural sea ice, Geophys. Res. Lett., 40, doi:10.1002/2013GL058479.

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