 |
| Titel |
Analysis of sea ice and phytoplankton biomarkers in marine sediments from the Nordic Seas - a calibration study |
| VerfasserIn |
A. Navarro Rodriguez, P. Cabedo Sanz, S. Belt, T. Brown, J. Knies, K. Husum, J. Giraudeau |
| Konferenz |
EGU General Assembly 2012
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250060712
|
|
|
|
|
|
| Zusammenfassung |
| The work presented here is part of the Changing Arctic and SubArctic Environment program
(EU CASE) which is an Initial Training Network (ITN) on climate change and marine
environment and is an interdisciplinary project focussing on biological proxies. One of these
proxies is the sea ice diatom biomarker IP25 which is a highly branched isoprenoid (HBI)
alkene synthesised by some Arctic sea-ice diatoms and has been shown to be a specific, stable
and sensitive proxy measure of Arctic sea ice when detected in underlying sediments (Belt et
al., 2007).
The current study focuses on two key elements: (1) An analytical calibration of IP25
isolated from marine sediments and purified using a range of chromatographic methods was
conducted in order to improve the quantification of this biomarker in sediment
extracts. (2) Analysis of >30 near-surface sediments from the Nordic Seas was
carried out to quantify biomarkers previously suggested as indicators of open-water
phytoplankton (brassicasterol) (Müller et al., 2011) and sea-ice (IP25) conditions
(Belt et al., 2010). The outcomes of the biomarker analyses were used to make
comparisons between proxy data and known sea ice conditions in the study area
derived from satellite record over the last 20 years. The results of this study should
inform longer timescale reconstructions of sea ice conditions in the Nordic sea in the
future.
Belt, S.T., Massé, G., Rowland. S.J., Poulin. M., Michel. C., LeBlanc. B., (2007).
A novel chemical fossil of palaeo sea ice : IP25 . Organic Geochemistry 38
(16-27).
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.
Müller, J., Wagner, A., Fahl, K., Stein, R., Prange, M., & Lohmann, G. (2011).
Towards quantitative sea ice reconstructions in the northern North Atlantic: A
combined biomarker and numerical modelling approach. Earth and Planetary
Science Letters, 306, 137-148. |
|
|
|
|
|
|