Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
doi:10.5194/bg-2017-101
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
29 Mar 2017
Review status
This discussion paper is under review for the journal Biogeosciences (BG).
Reconstructing Holocene temperature and salinity variations in the western Baltic Sea region: A multi-proxy comparison from the Little Belt (IODP Expedition 347, Site M0059)
Ulrich Kotthoff1,2, Jeroen Groeneveld3, Jeanine L. Ash4, Anne-Sophie Fanget5, Nadine Quintana Krupinski6, Odile Peyron7, Anna Stepanova8, Jonathan Warnock9, Niels A. G. M. Van Helmond10, Benjamin H. Passey11, Ole Rønø Clausen5, Ole Bennike12, Elinor Andrén13, Wojciech Granoszewski14, Thomas Andrén13, Helena L. Filipsson6, Marit-Solveig Seidenkrantz5, Caroline P. Slomp10, and Thorsten Bauersachs15 1Institute for Geology, University of Hamburg, D-20146, Hamburg, Germany
2Center of Natural History, University of Hamburg, Hamburg, D-20146, Germany
3MARUM, Center for Marine Environmental Sciences, University of Bremen, D-28359, Bremen, Germany
4Department of Earth, Planetary, and Space Sciences, UCLA, 90024, USA
5Centre for Past Climate Studies, Department of Geoscience, Aarhus University, 8000 Aarhus C, Denmark
6Department of Geology, Lund University, 22362 Lund, Sweden
7Institut des Sciences de l'Évolution, UMR 5554, Université de Montpellier, 34095 Montpellier cedex 05, France
8Department of Computer Science and Engineering, Texas A&M University, 77843, USA
9Department of Geoscience, Indiana University of Pennsylvania, 15705, USA
10Department of Earth Sciences – Geochemistry, Faculty of Geosciences, Utrecht University. PO Box 80021, 3508 TA Utrecht, Netherlands
11Department of Earth and Environmental Sciences, University of Michigan, 48109, USA
12Geological Survey of Denmark and Greenland, 1350 Copenhagen, Denmark
13School of Natural Sciences, Technology and Environmental Studies, Södertörn University, SE-14189 Huddinge, Sweden
14Polish Geological Institute-National Research Institute Krakow, 31-560 Krakow, Poland
15Christian-Albrechts-University, Institute of Geosciences, Department of Organic Geochemistry, 24118 Kiel, Germany
Abstract. Sediment records recovered from the Baltic Sea during Integrated Ocean Drilling Program Expedition 347 provide a unique opportunity to study paleoenvironmental and -climate change in central/northern Europe. Such studies contribute to a better understanding of how environmental parameters change in continental shelf seas and enclosed basins. We present a multi-proxy-based reconstruction of paleotemperature (both marine and terrestrial), -salinity, and -ecosystem changes from the Little Belt (Site M0059) over the past ~ 8000 years, and evaluate the applicability of inorganic and organic proxies in this particular setting. Salinity proxies (diatoms, aquatic palynomorphs, ostracods, long chain diol index – LDI) show that lacustrine conditions occurred in the Little Belt until ~ 7400 cal. yr BP. A connection to the Kattegat at this time can be excluded, but a direct connection to the Baltic Proper may have existed. The transition to the brackish-marine conditions (more saline and warmer) of the Littorina Sea stage occurred within ~ 200 yr when the connection to the Kattegat became established (~ 7400 cal. yr BP). The different salinity proxies used here show similar trends in relative changes in salinity, but do often not allow quantitative estimates of salinity. The reconstruction of water temperatures is associated with particular large uncertainties and variations in absolute values by up to 8 °C for bottom waters and even up to 16 °C for summer surface waters. Concerning the foraminiferal Mg/Ca reconstruction, contamination in the deeper intervals may have led to an over-estimation of temperatures. Differences in results based on the lipid proxies (LDI and TEXL86) can partly be explained by the application of modern-day proxy calibrations in areas which experienced significant changes in depositional settings, in case of our study e.g. change from freshwater to marine conditions. Our study shows that particular caution has to be taken when applying and interpreting proxies in coastal environments, where water mass conditions can experience more rapid and larger changes than in open-ocean settings. Approaches using a multitude of independent proxies may thus allow a more robust paleoenvironmental assessment.

Citation: Kotthoff, U., Groeneveld, J., Ash, J. L., Fanget, A.-S., Quintana Krupinski, N., Peyron, O., Stepanova, A., Warnock, J., Van Helmond, N. A. G. M., Passey, B. H., Clausen, O. R., Bennike, O., Andrén, E., Granoszewski, W., Andrén, T., Filipsson, H. L., Seidenkrantz, M.-S., Slomp, C. P., and Bauersachs, T.: Reconstructing Holocene temperature and salinity variations in the western Baltic Sea region: A multi-proxy comparison from the Little Belt (IODP Expedition 347, Site M0059), Biogeosciences Discuss., doi:10.5194/bg-2017-101, in review, 2017.
Ulrich Kotthoff et al.
Ulrich Kotthoff et al.

Data sets

Ostracod valve counts at IODP Site 347-M0059 (Baltic Sea), upper 52.3 meters composite depth. Dataset #873270
A. Y. Stepanova
https://doi.pangaea.de/10.1594/PANGAEA.873270
Ulrich Kotthoff et al.

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Short summary
We present reconstructions of paleotemperature, -salinity, and -ecology from the Little Belt (Site M0059) over the past ~ 8000 years, and evaluate the applicability of numerous proxies. Lacustrine conditions occurred until ~ 7400 cal. yr BP. A transition to brackish-marine conditions occurred subsequently within ~ 200 yr. Salinity proxies rarely allowed quantitative estimates but revealed congruent results, while quantitative temperature reconstructions differed depending on the used proxies.
We present reconstructions of paleotemperature, -salinity, and -ecology from the Little Belt...
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