The last two millennia: climate, ocean circulation and paleoproductivity inferred from planktic foraminifera, south-western Svalbard margin
We reconstruct climate and changes in water-mass properties in relation to variations in palaeoproductivity at the south-western Svalbard margin throughout the last 2000 years. Environmental conditions in subsurface (ca. 250–75 m) and near-surface to surface water (75–0 m) were studied on the basis...
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Online Access: | https://hdl.handle.net/11250/2685269 https://doi.org/10.33265/polar.v39.3715 |
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ftimr:oai:imr.brage.unit.no:11250/2685269 2023-05-15T18:02:38+02:00 The last two millennia: climate, ocean circulation and paleoproductivity inferred from planktic foraminifera, south-western Svalbard margin Zamelczyk, Katarzyna Rasmussen, Tine Lander Raitzsch, Markus Chierici, Melissa 2020 application/pdf https://hdl.handle.net/11250/2685269 https://doi.org/10.33265/polar.v39.3715 eng eng Norges forskningsråd: 223259 Norges forskningsråd: 216538 Polar Research. 2020, 39 (3715), . urn:issn:0800-0395 https://hdl.handle.net/11250/2685269 https://doi.org/10.33265/polar.v39.3715 cristin:1841260 23 39 Polar Research 3715 Peer reviewed Journal article 2020 ftimr https://doi.org/10.33265/polar.v39.3715 2021-09-23T20:14:52Z We reconstruct climate and changes in water-mass properties in relation to variations in palaeoproductivity at the south-western Svalbard margin throughout the last 2000 years. Environmental conditions in subsurface (ca. 250–75 m) and near-surface to surface water (75–0 m) were studied on the basis of the distribution patterns and fluxes of planktic foraminiferal faunas. Stable isotopes in three different species were measured, and Mg/Ca- and transfer function-based sea-surface temperatures were calculated. The mean shell weights of planktic foraminiferal species were used to assess changes in calcium carbonate preservation. Modern total planktic foraminiferal distribution patterns from plankton tows and the water column carbonate chemistry were investigated for comparison with the palaeo-data. The results show warm sea-surface conditions and moderate to high surface productivity at ca. 21–400 AD, ca. 900–1400 AD and from about 1850 AD until present, which may be local expressions of the European climatic events known as the Roman Warm Period, the Medieval Climate Anomaly and the Recent Warming. In general, cold near-sea-surface conditions and very low to moderate average productivity occurred at about 400–900 AD and ca. 1400–1850 AD, the latter probably the local expression of the Little Ice Age. The highest and most variable planktic productivity occurred at ca. 1300–1500 AD, ca. 1750–1860 AD and during the last 50 years or so. These periods are linked to the general amelioration of conditions from years with a dense sea-ice cover to years with a rapidly fluctuating summer sea-ice margin publishedVersion Article in Journal/Newspaper Polar Research Sea ice Svalbard Svalbard margin Institute for Marine Research: Brage IMR Svalbard Polar Research 39 0 |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
description |
We reconstruct climate and changes in water-mass properties in relation to variations in palaeoproductivity at the south-western Svalbard margin throughout the last 2000 years. Environmental conditions in subsurface (ca. 250–75 m) and near-surface to surface water (75–0 m) were studied on the basis of the distribution patterns and fluxes of planktic foraminiferal faunas. Stable isotopes in three different species were measured, and Mg/Ca- and transfer function-based sea-surface temperatures were calculated. The mean shell weights of planktic foraminiferal species were used to assess changes in calcium carbonate preservation. Modern total planktic foraminiferal distribution patterns from plankton tows and the water column carbonate chemistry were investigated for comparison with the palaeo-data. The results show warm sea-surface conditions and moderate to high surface productivity at ca. 21–400 AD, ca. 900–1400 AD and from about 1850 AD until present, which may be local expressions of the European climatic events known as the Roman Warm Period, the Medieval Climate Anomaly and the Recent Warming. In general, cold near-sea-surface conditions and very low to moderate average productivity occurred at about 400–900 AD and ca. 1400–1850 AD, the latter probably the local expression of the Little Ice Age. The highest and most variable planktic productivity occurred at ca. 1300–1500 AD, ca. 1750–1860 AD and during the last 50 years or so. These periods are linked to the general amelioration of conditions from years with a dense sea-ice cover to years with a rapidly fluctuating summer sea-ice margin publishedVersion |
format |
Article in Journal/Newspaper |
author |
Zamelczyk, Katarzyna Rasmussen, Tine Lander Raitzsch, Markus Chierici, Melissa |
spellingShingle |
Zamelczyk, Katarzyna Rasmussen, Tine Lander Raitzsch, Markus Chierici, Melissa The last two millennia: climate, ocean circulation and paleoproductivity inferred from planktic foraminifera, south-western Svalbard margin |
author_facet |
Zamelczyk, Katarzyna Rasmussen, Tine Lander Raitzsch, Markus Chierici, Melissa |
author_sort |
Zamelczyk, Katarzyna |
title |
The last two millennia: climate, ocean circulation and paleoproductivity inferred from planktic foraminifera, south-western Svalbard margin |
title_short |
The last two millennia: climate, ocean circulation and paleoproductivity inferred from planktic foraminifera, south-western Svalbard margin |
title_full |
The last two millennia: climate, ocean circulation and paleoproductivity inferred from planktic foraminifera, south-western Svalbard margin |
title_fullStr |
The last two millennia: climate, ocean circulation and paleoproductivity inferred from planktic foraminifera, south-western Svalbard margin |
title_full_unstemmed |
The last two millennia: climate, ocean circulation and paleoproductivity inferred from planktic foraminifera, south-western Svalbard margin |
title_sort |
last two millennia: climate, ocean circulation and paleoproductivity inferred from planktic foraminifera, south-western svalbard margin |
publishDate |
2020 |
url |
https://hdl.handle.net/11250/2685269 https://doi.org/10.33265/polar.v39.3715 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
Polar Research Sea ice Svalbard Svalbard margin |
genre_facet |
Polar Research Sea ice Svalbard Svalbard margin |
op_source |
23 39 Polar Research 3715 |
op_relation |
Norges forskningsråd: 223259 Norges forskningsråd: 216538 Polar Research. 2020, 39 (3715), . urn:issn:0800-0395 https://hdl.handle.net/11250/2685269 https://doi.org/10.33265/polar.v39.3715 cristin:1841260 |
op_doi |
https://doi.org/10.33265/polar.v39.3715 |
container_title |
Polar Research |
container_volume |
39 |
container_issue |
0 |
_version_ |
1766173031024033792 |