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2014-02-31-stroeve

Seasonal Arctic summer ice extent still hard to forecast.

A new study lead by Prof Julienne Stroeve says year-to-year forecasts of the Arctic’s summer ice extent are not yet reliable.
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Environmental Sedimentology Facility

  • Location: Core Scanning Lab- Room O1.20, 1st Floor, Kathleen Lonsdale Building
  • Telephone Extension: 32616
  • Laboratory Manager: Prof Juergen Thurow

Env. Sediments

The Environmental Sedimentology lab houses a XRF core scanner and multi-sensor core logger. There are two chest-fridges for temporary storage of cores up to a length of 1.6 m. and bench space for sample preparation and core photography

Avaatech XRF-scanner

XRF_Scanner-env-sediment

The scanner uses standard XRF-technology to measure elemental abundances on split sediment cores without the need for sample preparation. It is designed to allow fast analysis of long and continuous records: it typically takes ~2 hours to scan 1 m of core at 1 cm resolution for a standard suite of elements. The trade-off is that results are semi-quantitative, because variation in water content and/or porosity is not accounted for. However, results can be calibrated through analysis of a limited set of discrete samples using standard XRF or ICP-MS. The XRF-scanner can detect elements ranging from Al through to U, the stratigraphic resolution can be adjusted from 1 mm to 1 cm. The detection limit varies between elements, ranging from 1% for Al to ppm-levels for elements higher in the periodic table.

Geotek Multi-Sensor Core logger

Geotek Multi-Sensor Core Logger

The core-logger is used to collect a suite of geophysical measurements on both whole-round and split cores. Our MSCL is equipped to measure gamma ray attenuation (GRAPE), which provides an estimate for density/porosity of the sediment, P-wave velocities, electrical resistivity, and magnetic susceptibility.


The FlashEA can measure the abundance of organic elements in samples as small as 0.01 mg depending on the type of material. It is routinely set up for analysis of C and N in sediment samples, but can be reconfigured for CHNS-O or any combination of those elements. 


UCL Earth Sciences · Gower Street London WC1E 6BT · +44 (0)20 7679 2363
earthsci@ucl.ac.uk · more