Seasonal sea ice variability in eastern Fram Strait over the last 2000 years
We present a high-resolution (ca. 50 years) biomarker-based reconstruction of seasonal sea ice conditions for the West Svalbard continental margin covering the last ca. 2k years. Our reconstruction is based on the distributions of sea ice algal (IP25) and phytoplankton (brassicasterol and HBI III) l...
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Online Access: | http://hdl.handle.net/10026.1/5102 https://doi.org/10.1007/s41063-016-0023-2 |
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ftunivplympearl:oai:pearl.plymouth.ac.uk:10026.1/5102 2024-05-19T07:40:31+00:00 Seasonal sea ice variability in eastern Fram Strait over the last 2000 years Cabedo-Sanz, P Belt, ST 2016-07-08 22- application/pdf http://hdl.handle.net/10026.1/5102 https://doi.org/10.1007/s41063-016-0023-2 en eng Springer Science and Business Media LLC ISSN:2364-9453 ISSN:2364-9461 E-ISSN:2364-9461 2364-9453 2364-9461 22 http://hdl.handle.net/10026.1/5102 doi:10.1007/s41063-016-0023-2 2017-7-8 Not known 37 Earth Sciences 3708 Oceanography 3709 Physical Geography and Environmental Geoscience 3705 Geology 14 Life Below Water journal-article 2016 ftunivplympearl https://doi.org/10.1007/s41063-016-0023-2 2024-05-01T00:05:12Z We present a high-resolution (ca. 50 years) biomarker-based reconstruction of seasonal sea ice conditions for the West Svalbard continental margin covering the last ca. 2k years. Our reconstruction is based on the distributions of sea ice algal (IP25) and phytoplankton (brassicasterol and HBI III) lipids in marine sediment core MSM5/5-712-1 retrieved in 2007. The individual and combined (PIP25) temporal profiles, together with estimates of spring sea ice concentration [SpSIC (%)] based on a recent calibration, suggest that sea ice conditions during the interval ca. 50–1700 AD may not have been as variable as described in previous reconstructions, with SpSIC generally in the range ca. 35–45 %. A slight enhancement in SpSIC (ca. 50 %) was identified at ca. 1600 AD, contemporaneous with the Little Ice Age, before declining steadily over the subsequent ca. 400 years to near-modern values (ca. 25 %). In contrast to these spring conditions, our data suggest that surface waters during summer months were ice free for the entire record. The decline in SpSIC in recent centuries is consistent with the known retreat of the winter ice margin from documentary sea ice records. This decrease in sea ice is possibly attributed to enhanced inflow of warm water delivered by the North Atlantic Current and/or increasing air temperatures, as shown in previous marine and terrestrial records. Comparison of our biomarker-based sea ice reconstruction with one obtained previously based on dinocyst distributions in a core from a similar location reveals partial agreement in the early–mid part of the records (ca. 50–1700 AD), but a notable divergence in the most recent ca. 300 years. We hypothesise that this divergence likely reflects the individual signatures of each proxy method, especially as the biomarker-based SpSIC estimates during this interval (<25 %) are much lower than the threshold level (>50 % sea ice cover) used for the dinocyst approach. Alternatively, divergence between outcomes may indicate seasonality shifts in sea ice ... Article in Journal/Newspaper Fram Strait north atlantic current North Atlantic Sea ice Svalbard PEARL (Plymouth Electronic Archiv & ResearchLibrary, Plymouth University) arktos 2 1 |
institution |
Open Polar |
collection |
PEARL (Plymouth Electronic Archiv & ResearchLibrary, Plymouth University) |
op_collection_id |
ftunivplympearl |
language |
English |
topic |
37 Earth Sciences 3708 Oceanography 3709 Physical Geography and Environmental Geoscience 3705 Geology 14 Life Below Water |
spellingShingle |
37 Earth Sciences 3708 Oceanography 3709 Physical Geography and Environmental Geoscience 3705 Geology 14 Life Below Water Cabedo-Sanz, P Belt, ST Seasonal sea ice variability in eastern Fram Strait over the last 2000 years |
topic_facet |
37 Earth Sciences 3708 Oceanography 3709 Physical Geography and Environmental Geoscience 3705 Geology 14 Life Below Water |
description |
We present a high-resolution (ca. 50 years) biomarker-based reconstruction of seasonal sea ice conditions for the West Svalbard continental margin covering the last ca. 2k years. Our reconstruction is based on the distributions of sea ice algal (IP25) and phytoplankton (brassicasterol and HBI III) lipids in marine sediment core MSM5/5-712-1 retrieved in 2007. The individual and combined (PIP25) temporal profiles, together with estimates of spring sea ice concentration [SpSIC (%)] based on a recent calibration, suggest that sea ice conditions during the interval ca. 50–1700 AD may not have been as variable as described in previous reconstructions, with SpSIC generally in the range ca. 35–45 %. A slight enhancement in SpSIC (ca. 50 %) was identified at ca. 1600 AD, contemporaneous with the Little Ice Age, before declining steadily over the subsequent ca. 400 years to near-modern values (ca. 25 %). In contrast to these spring conditions, our data suggest that surface waters during summer months were ice free for the entire record. The decline in SpSIC in recent centuries is consistent with the known retreat of the winter ice margin from documentary sea ice records. This decrease in sea ice is possibly attributed to enhanced inflow of warm water delivered by the North Atlantic Current and/or increasing air temperatures, as shown in previous marine and terrestrial records. Comparison of our biomarker-based sea ice reconstruction with one obtained previously based on dinocyst distributions in a core from a similar location reveals partial agreement in the early–mid part of the records (ca. 50–1700 AD), but a notable divergence in the most recent ca. 300 years. We hypothesise that this divergence likely reflects the individual signatures of each proxy method, especially as the biomarker-based SpSIC estimates during this interval (<25 %) are much lower than the threshold level (>50 % sea ice cover) used for the dinocyst approach. Alternatively, divergence between outcomes may indicate seasonality shifts in sea ice ... |
format |
Article in Journal/Newspaper |
author |
Cabedo-Sanz, P Belt, ST |
author_facet |
Cabedo-Sanz, P Belt, ST |
author_sort |
Cabedo-Sanz, P |
title |
Seasonal sea ice variability in eastern Fram Strait over the last 2000 years |
title_short |
Seasonal sea ice variability in eastern Fram Strait over the last 2000 years |
title_full |
Seasonal sea ice variability in eastern Fram Strait over the last 2000 years |
title_fullStr |
Seasonal sea ice variability in eastern Fram Strait over the last 2000 years |
title_full_unstemmed |
Seasonal sea ice variability in eastern Fram Strait over the last 2000 years |
title_sort |
seasonal sea ice variability in eastern fram strait over the last 2000 years |
publisher |
Springer Science and Business Media LLC |
publishDate |
2016 |
url |
http://hdl.handle.net/10026.1/5102 https://doi.org/10.1007/s41063-016-0023-2 |
genre |
Fram Strait north atlantic current North Atlantic Sea ice Svalbard |
genre_facet |
Fram Strait north atlantic current North Atlantic Sea ice Svalbard |
op_relation |
ISSN:2364-9453 ISSN:2364-9461 E-ISSN:2364-9461 2364-9453 2364-9461 22 http://hdl.handle.net/10026.1/5102 doi:10.1007/s41063-016-0023-2 |
op_rights |
2017-7-8 Not known |
op_doi |
https://doi.org/10.1007/s41063-016-0023-2 |
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arktos |
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2 |
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1799480078547025920 |