Midterm Colloquium by Martin Braun – Niels Bohr Institute - University of Copenhagen

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Midterm Colloquium by Martin Braun

Greenland and Antarctic aerosol records

Abstract
Records of ice core impurities, also known as 'Glaciochemistry', provide unique possibilities to obtain information about the natural variability of past climatic conditions. Soluble and insoluble impurities and organic components give an excellent opportunity to investigate past changes of atmospheric circulation, volcanic eruptions, biological activity and human impact. The ice core impurities can help to investigate changes in the strength of the source areas, the pathway of chemical species in the Earth's atmosphere, and deposition patterns. Furthermore, when ice cores have high temporal resolution, the impurity records may offer a way to date ice cores by annual layer counting.

Continuous Flow Analysis (CFA) is a measurement technique that gives the advantage of obtaining continuously acquired ice records in high temporal and spatial resolution. Measurements are usually conducted through fluorometric or absorption techniques respectively, but also fast ion chromatography can be used with a steady sample stream being injected.

I will present an overview of glaciochemical measurements in general and describe the analysis of soluble and insoluble components in the CFA system. Finally, I will discuss the measurements of 5m of early Holocene ice from the Antarctic Dome Fuji ice core conducted in spring 2012 and my contribution to the dating of this ice by annual layer counting.

Supervisor: Anders Svensson