Coastal primary productivity changes over the last millennium: a case study from the Skagerrak (North Sea)
A comprehensive multi-proxy study on two sediment cores from the western and central Skagerrak was performed in order to detect the variability and causes of marine primary productivity changes in the investigated region over the last 1100 years. The cores were dated by Hg pollution records and AMS...
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2018
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ftdoajarticles:oai:doaj.org/article:83d7e5bd15214fa09acd376e09a4f9d3 2023-05-15T18:01:12+02:00 Coastal primary productivity changes over the last millennium: a case study from the Skagerrak (North Sea) A. Binczewska B. Risebrobakken I. Polovodova Asteman M. Moros A. Tisserand E. Jansen A. Witkowski 2018-10-01T00:00:00Z https://doi.org/10.5194/bg-15-5909-2018 https://doaj.org/article/83d7e5bd15214fa09acd376e09a4f9d3 EN eng Copernicus Publications https://www.biogeosciences.net/15/5909/2018/bg-15-5909-2018.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-15-5909-2018 1726-4170 1726-4189 https://doaj.org/article/83d7e5bd15214fa09acd376e09a4f9d3 Biogeosciences, Vol 15, Pp 5909-5928 (2018) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2018 ftdoajarticles https://doi.org/10.5194/bg-15-5909-2018 2022-12-31T12:35:03Z A comprehensive multi-proxy study on two sediment cores from the western and central Skagerrak was performed in order to detect the variability and causes of marine primary productivity changes in the investigated region over the last 1100 years. The cores were dated by Hg pollution records and AMS 14 C dating and analysed for palaeoproductivity proxies such as total organic carbon, δ 13 C, total planktonic foraminifera, benthic foraminifera (total assemblages as well as abundance of Brizalina skagerrakensis and other palaeoproductivity taxa) and palaeothermometers such as Mg∕Ca and δ 18 O. Our results reveal two periods with changes in productivity in the Skagerrak region: (i) a moderate productivity at ∼ CE 900–1700 and (ii) a high productivity at ∼ CE 1700–present. During ∼ CE 900–1700, moderate productivity was likely driven by the nutrients transported with the warm Atlantic water inflow associated with a tendency for a persistent positive NAO phase during the warm climate of the Medieval Climate Anomaly, which continues into the LIA until ∼ CE 1450. The following lower and more variable temperature period at ∼ CE 1450–1700 was likely caused by a reduced contribution of warm Atlantic water, but stronger deep-water renewal, due to a generally more negative NAO phase and a shift to the more variable and generally cooler climate conditions of the Little Ice Age. The productivity and fluxes of organic matter to the seafloor did not correspond to the temperature and salinity changes recorded in the benthic Melonis barleeanus shells. For the period from ∼ CE 1700 to the present day, our data point to an increased nutrient content in the Skagerrak waters. This increased nutrient content was likely caused by enhanced inflow of warm Atlantic water, increased Baltic outflow, intensified river runoff, and enhanced human impact through agricultural expansion and industrial development. Intensified human impact likely increased nutrient transport to the Skagerrak and caused changes in the oceanic carbon isotope budget, ... Article in Journal/Newspaper Planktonic foraminifera Directory of Open Access Journals: DOAJ Articles Biogeosciences 15 19 5909 5928 |
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English |
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Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
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Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 A. Binczewska B. Risebrobakken I. Polovodova Asteman M. Moros A. Tisserand E. Jansen A. Witkowski Coastal primary productivity changes over the last millennium: a case study from the Skagerrak (North Sea) |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
A comprehensive multi-proxy study on two sediment cores from the western and central Skagerrak was performed in order to detect the variability and causes of marine primary productivity changes in the investigated region over the last 1100 years. The cores were dated by Hg pollution records and AMS 14 C dating and analysed for palaeoproductivity proxies such as total organic carbon, δ 13 C, total planktonic foraminifera, benthic foraminifera (total assemblages as well as abundance of Brizalina skagerrakensis and other palaeoproductivity taxa) and palaeothermometers such as Mg∕Ca and δ 18 O. Our results reveal two periods with changes in productivity in the Skagerrak region: (i) a moderate productivity at ∼ CE 900–1700 and (ii) a high productivity at ∼ CE 1700–present. During ∼ CE 900–1700, moderate productivity was likely driven by the nutrients transported with the warm Atlantic water inflow associated with a tendency for a persistent positive NAO phase during the warm climate of the Medieval Climate Anomaly, which continues into the LIA until ∼ CE 1450. The following lower and more variable temperature period at ∼ CE 1450–1700 was likely caused by a reduced contribution of warm Atlantic water, but stronger deep-water renewal, due to a generally more negative NAO phase and a shift to the more variable and generally cooler climate conditions of the Little Ice Age. The productivity and fluxes of organic matter to the seafloor did not correspond to the temperature and salinity changes recorded in the benthic Melonis barleeanus shells. For the period from ∼ CE 1700 to the present day, our data point to an increased nutrient content in the Skagerrak waters. This increased nutrient content was likely caused by enhanced inflow of warm Atlantic water, increased Baltic outflow, intensified river runoff, and enhanced human impact through agricultural expansion and industrial development. Intensified human impact likely increased nutrient transport to the Skagerrak and caused changes in the oceanic carbon isotope budget, ... |
format |
Article in Journal/Newspaper |
author |
A. Binczewska B. Risebrobakken I. Polovodova Asteman M. Moros A. Tisserand E. Jansen A. Witkowski |
author_facet |
A. Binczewska B. Risebrobakken I. Polovodova Asteman M. Moros A. Tisserand E. Jansen A. Witkowski |
author_sort |
A. Binczewska |
title |
Coastal primary productivity changes over the last millennium: a case study from the Skagerrak (North Sea) |
title_short |
Coastal primary productivity changes over the last millennium: a case study from the Skagerrak (North Sea) |
title_full |
Coastal primary productivity changes over the last millennium: a case study from the Skagerrak (North Sea) |
title_fullStr |
Coastal primary productivity changes over the last millennium: a case study from the Skagerrak (North Sea) |
title_full_unstemmed |
Coastal primary productivity changes over the last millennium: a case study from the Skagerrak (North Sea) |
title_sort |
coastal primary productivity changes over the last millennium: a case study from the skagerrak (north sea) |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/bg-15-5909-2018 https://doaj.org/article/83d7e5bd15214fa09acd376e09a4f9d3 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Biogeosciences, Vol 15, Pp 5909-5928 (2018) |
op_relation |
https://www.biogeosciences.net/15/5909/2018/bg-15-5909-2018.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-15-5909-2018 1726-4170 1726-4189 https://doaj.org/article/83d7e5bd15214fa09acd376e09a4f9d3 |
op_doi |
https://doi.org/10.5194/bg-15-5909-2018 |
container_title |
Biogeosciences |
container_volume |
15 |
container_issue |
19 |
container_start_page |
5909 |
op_container_end_page |
5928 |
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1766170567391576064 |