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| Titel |
Calibration and application of the IP25 biomarker for Arctic sea ice reconstructions |
| VerfasserIn |
P. Cabedo Sanz, A. Navarro Rodriguez, S. T. Belt, T. A. Brown, J. Knies, K. Husum, J. Giraudeau, J. Andrews |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250060710
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| Zusammenfassung |
| The presence of the sea ice diatom biomarker IP25 in Arctic marine sediments has been used
in previous studies as a proxy for past spring sea ice occurrence and as an indicator of wider
palaeoenvironmental conditions for different regions of the Arctic over various
timescales [e.g. 1, 3]. In addition, measurement of IP25 has also been applied as a sea ice
origin tracer for studying the transfer of organic carbon through Arctic food-webs
[2].
The current study focuses on three main areas: (1) In order to improve on the quantitative
analytical aspects of IP25 based research, we present here the results of a large scale
extraction, purification and identification procedure for IP25 from marine sediments. This has
confirmed the structure of IP25 in sediments and enabled more robust quantitative
measurements by gas chromatography – mass spectrometry (GC-MS) to be established. (2)
Quantitative measurements of IP25 from a sediment core from Andfjord (continental shelf,
Tromsø, Norway) have been determined for the period 6.3 to 14.3 ka BP. The results of this
study add significant further information to that reported previously from other biomarker
studies for this core (e.g. brassicasterol) [4]. (3) Analytical detection issues (GC-MS)
regarding the occurrence of IP25 in other sub-Arctic regions (e.g. East Greenland – North
Iceland area) will be presented and discussed with relation to other proxy data (e.g.
IRD).
Belt, S. T., Vare, L. L., Massé, G., Manners, H. R., Price, J. C., MacLachlan,
S. E., Andrews, J. T. & Schmidt, S. (2010) ’Striking similarities in temporal
changes to spring sea ice occurrence across the central Canadian Arctic
Archipelago over the last 7000 years’, Quaternary Science Reviews, 29 (25-26),
pp. 3489-3504.
Brown, T. A. & Belt, S. T. (2012) ’Identification of the sea ice diatom biomarker
IP25 in Arctic benthic macrofauna: direct evidence for a sea ice diatom diet in
Arctic heterotrophs’, Polar Biology, 35, pp. 131-137.
Müller, J., Massé, G., Stein, R. & Belt, S. T. (2009) ’Variability of sea-ice
conditions in the Fram Strait over the past 30,000 years’, Nature Geoscience, 2
(11), pp. 772-776.
.Knies, J. (2005) ’Climate-induced changes in sedimentary regimes for organic
matter supply on the continental shelf off northern Norway’, Geochimica et
Cosmochimica Acta, 69 (19), pp. 4631-4647. |
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