Organic marker compounds in surface sediments from the Nordic Seas


Organic geochemical analyses of marine surface sediments from the continental margins of East Greenland and West Spitsbergen provide for a biomarker-based estimate of recent sea ice conditions in the northern North Atlantic. By means of the sea ice proxy IP25 and phytoplankton derived biomarkers (e.g. brassicasterol, dinosterol) we reconstruct sea ice and sea surface conditions, respectively. The combination of IP25 with a phytoplankton marker (in terms of a phytoplankton marker-IP25 index; PIP25) proves highly valuable to properly interpret the sea ice proxy signal as an under- or overestimation of sea ice coverage can be circumvented. A comparison of this biomarker-based assessment of the sea ice distribution in the study area with (1) modern remote sensing data and (2) numerical modelling results reveals a good agreement between organic geochemical, satellite and modelling observations. The reasonable simulation of modern sea ice conditions by means of a regional ocean-sea ice model demonstrates the feasibility to effectively integrate the complex atmospheric and oceanic circulation features as they prevail in the study area. The good correlation between modelled sea ice parameters and the biomarker-based estimate of sea ice coverage substantiates that linking proxy and model data occurs to be a promising concept in terms of a cross-evaluation. This combinatory approach may provide a first step towards quantitative sea ice reconstructions by means of IP25. Future IP25 studies on marine surface sediments from the Arctic realm, however, are recommended to extend and validate this new attempt of using IP25 in combination with a phytoplankton marker as a quantitative measure for sea ice reconstructions.

For further details on the total organic carbon data cited in the article we refer to the data set entries by Kierdorf (2006) doi:10.1594/PANGAEA.499864 and Birgel and Stein (2004) doi:10.1594/PANGAEA.191089. Dataset has been reformated after discussion with the PI.

Related Identifier
Metadata Access
Creator Müller, Juliane ORCID logo; Wagner, Axel; Fahl, Kirsten ORCID logo; Stein, Ruediger ORCID logo; Prange, Matthias (ORCID: 0000-0001-5874-756X); Lohmann, Gerrit (ORCID: 0000-0003-2089-733X)
Publisher PANGAEA
Publication Year 2011
Funding Reference German Research Foundation Crossref Funder ID 25575884 Integrierte Analyse zwischeneiszeitlicher Klimadynamik
Rights Creative Commons Attribution 3.0 Unported;
OpenAccess true
Language English
Resource Type Dataset
Format text/tab-separated-values
Size 748 data points
Discipline Earth System Research
Spatial Coverage (-39.374W, 61.526S, 15.882E, 79.130N); North Greenland Sea; Greenland Sea; Iceland Sea; East Greenland Sea; Kempe Fjord, East Greenland; Hurry Inlet, East Greenland; Ø Fjord, East Greenland
Temporal Coverage Begin 1994-09-03T22:51:00Z
Temporal Coverage End 2003-08-30T05:49:00Z