Forskning ved Københavns Universitet - Københavns Universitet


Direct observation of salts as micro-inclusions in the Greenland GRIP ice core

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

We provide the first direct evidence that a number of water-soluble compounds, in particular calcium sulfate (CaSO4·2H2O) and calcium carbonate (CaCO3), are present as solid, micron-sized inclusions within the Greenland GRIP ice core. The compounds are detected by two independent methods: micro-Raman spectroscopy of a solid ice sample, and energy-dispersive X-ray spectroscopy of individual inclusions remaining after sublimation. CaSO4·2H2O is found in abundance throughout the Holocene and the last glacial period, while CaCO3 exists mainly in the glacial period ice. We also present size and spatial distributions of the micro-inclusions. These results suggest that water-soluble aerosols in the GRIP ice core are dependable proxies for past atmospheric conditions.
Udgivelsesdato: December
TidsskriftJournal of Glaciology
Udgave nummer193
Sider (fra-til)777-783
Antal sider7
StatusUdgivet - 2009

Bibliografisk note

Paper id:: 10.3189/002214309790152483

ID: 17342949