An expanded database of Southern Hemisphere surface sediment dinoflagellate cyst assemblages and their oceanographic affinities
Dinoflagellate cyst assemblages present a valuable proxy to infer paleoceanographic conditions, yet factors influencing geographic distributions of species remain largely unknown, especially in the Southern Ocean. Strong lateral transport, sea-ice dynamics, and a sparse and uneven geographic distrib...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/429754 2023-08-27T04:06:16+02:00 An expanded database of Southern Hemisphere surface sediment dinoflagellate cyst assemblages and their oceanographic affinities Thöle, Lena Mareike Nooteboom, Peter Dirk Hou, Suning Wang, Rujian Nie, Senyan Michel, Elisabeth Sauermilch, Isabel Marret, Fabienne Sangiorgi, Francesca Bijl, Peter Kristian Marine palynology and palaeoceanography Sub Physical Oceanography Marine Palynology 2023-06-02 application/pdf https://dspace.library.uu.nl/handle/1874/429754 en eng 0262-821X https://dspace.library.uu.nl/handle/1874/429754 info:eu-repo/semantics/OpenAccess Offshore wilkes land Antarctic ice-sheet Southwest pacific Overturning circulation Sea Cysts Reconstruction Framework Holocene Closure Palaeontology Article 2023 ftunivutrecht 2023-08-02T22:11:42Z Dinoflagellate cyst assemblages present a valuable proxy to infer paleoceanographic conditions, yet factors influencing geographic distributions of species remain largely unknown, especially in the Southern Ocean. Strong lateral transport, sea-ice dynamics, and a sparse and uneven geographic distribution of surface sediment samples have limited the use of dinocyst assemblages as a quantitative proxy for paleo-environmental conditions such as sea surface temperature (SST), nutrient concentrations, salinity, and sea ice (presence). In this study we present a new set of surface sediment samples (nCombining double low line66) from around Antarctica, doubling the number of Antarctic-proximal samples to 100 (dataset wsi_100) and increasing the total number of Southern Hemisphere samples to 655 (dataset sh_655). Additionally, we use modelled ocean conditions and apply Lagrangian techniques to all Southern Hemisphere sample stations to quantify and evaluate the influence of lateral transport on the sinking trajectory of microplankton and, with that, to the inferred ocean conditions. k-means cluster analysis on the wsi_100 dataset demonstrates the strong affinity of Selenopemphix antarctica with sea-ice presence and of Islandinium spp. with low-salinity conditions. For the entire Southern Hemisphere, the k-means cluster analysis identifies nine clusters with a characteristic assemblage. In most clusters a single dinocyst species dominates the assemblage. These clusters correspond to well-defined oceanic conditions in specific Southern Ocean zones or along the ocean fronts. We find that, when lateral transport is predominantly zonal, the environmental parameters inferred from the sea floor assemblages mostly correspond to those of the overlying ocean surface. In this case, the transport factor can thus be neglected and will not represent a bias in the reconstructions. Yet, for some individual sites, e.g. deep-water sites or sites under strong-current regimes, lateral transport can play a large role. The results of our ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Sea ice Southern Ocean Wilkes Land Utrecht University Repository Antarctic Pacific Southern Ocean Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Offshore wilkes land Antarctic ice-sheet Southwest pacific Overturning circulation Sea Cysts Reconstruction Framework Holocene Closure Palaeontology |
spellingShingle |
Offshore wilkes land Antarctic ice-sheet Southwest pacific Overturning circulation Sea Cysts Reconstruction Framework Holocene Closure Palaeontology Thöle, Lena Mareike Nooteboom, Peter Dirk Hou, Suning Wang, Rujian Nie, Senyan Michel, Elisabeth Sauermilch, Isabel Marret, Fabienne Sangiorgi, Francesca Bijl, Peter Kristian An expanded database of Southern Hemisphere surface sediment dinoflagellate cyst assemblages and their oceanographic affinities |
topic_facet |
Offshore wilkes land Antarctic ice-sheet Southwest pacific Overturning circulation Sea Cysts Reconstruction Framework Holocene Closure Palaeontology |
description |
Dinoflagellate cyst assemblages present a valuable proxy to infer paleoceanographic conditions, yet factors influencing geographic distributions of species remain largely unknown, especially in the Southern Ocean. Strong lateral transport, sea-ice dynamics, and a sparse and uneven geographic distribution of surface sediment samples have limited the use of dinocyst assemblages as a quantitative proxy for paleo-environmental conditions such as sea surface temperature (SST), nutrient concentrations, salinity, and sea ice (presence). In this study we present a new set of surface sediment samples (nCombining double low line66) from around Antarctica, doubling the number of Antarctic-proximal samples to 100 (dataset wsi_100) and increasing the total number of Southern Hemisphere samples to 655 (dataset sh_655). Additionally, we use modelled ocean conditions and apply Lagrangian techniques to all Southern Hemisphere sample stations to quantify and evaluate the influence of lateral transport on the sinking trajectory of microplankton and, with that, to the inferred ocean conditions. k-means cluster analysis on the wsi_100 dataset demonstrates the strong affinity of Selenopemphix antarctica with sea-ice presence and of Islandinium spp. with low-salinity conditions. For the entire Southern Hemisphere, the k-means cluster analysis identifies nine clusters with a characteristic assemblage. In most clusters a single dinocyst species dominates the assemblage. These clusters correspond to well-defined oceanic conditions in specific Southern Ocean zones or along the ocean fronts. We find that, when lateral transport is predominantly zonal, the environmental parameters inferred from the sea floor assemblages mostly correspond to those of the overlying ocean surface. In this case, the transport factor can thus be neglected and will not represent a bias in the reconstructions. Yet, for some individual sites, e.g. deep-water sites or sites under strong-current regimes, lateral transport can play a large role. The results of our ... |
author2 |
Marine palynology and palaeoceanography Sub Physical Oceanography Marine Palynology |
format |
Article in Journal/Newspaper |
author |
Thöle, Lena Mareike Nooteboom, Peter Dirk Hou, Suning Wang, Rujian Nie, Senyan Michel, Elisabeth Sauermilch, Isabel Marret, Fabienne Sangiorgi, Francesca Bijl, Peter Kristian |
author_facet |
Thöle, Lena Mareike Nooteboom, Peter Dirk Hou, Suning Wang, Rujian Nie, Senyan Michel, Elisabeth Sauermilch, Isabel Marret, Fabienne Sangiorgi, Francesca Bijl, Peter Kristian |
author_sort |
Thöle, Lena Mareike |
title |
An expanded database of Southern Hemisphere surface sediment dinoflagellate cyst assemblages and their oceanographic affinities |
title_short |
An expanded database of Southern Hemisphere surface sediment dinoflagellate cyst assemblages and their oceanographic affinities |
title_full |
An expanded database of Southern Hemisphere surface sediment dinoflagellate cyst assemblages and their oceanographic affinities |
title_fullStr |
An expanded database of Southern Hemisphere surface sediment dinoflagellate cyst assemblages and their oceanographic affinities |
title_full_unstemmed |
An expanded database of Southern Hemisphere surface sediment dinoflagellate cyst assemblages and their oceanographic affinities |
title_sort |
expanded database of southern hemisphere surface sediment dinoflagellate cyst assemblages and their oceanographic affinities |
publishDate |
2023 |
url |
https://dspace.library.uu.nl/handle/1874/429754 |
long_lat |
ENVELOPE(120.000,120.000,-69.000,-69.000) |
geographic |
Antarctic Pacific Southern Ocean Wilkes Land |
geographic_facet |
Antarctic Pacific Southern Ocean Wilkes Land |
genre |
Antarc* Antarctic Antarctica Ice Sheet Sea ice Southern Ocean Wilkes Land |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Sea ice Southern Ocean Wilkes Land |
op_relation |
0262-821X https://dspace.library.uu.nl/handle/1874/429754 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1775347079513636864 |