Geochemical biomarker analyses on sediment cores PS51/154-11 and PS51/159-10 from the western Laptev Sea (Arctic Ocean)
Multi-proxy biomarker measurements were applied on two sediment cores (PS51/154, PS51/159) to reconstruct sea ice cover (IP25), biological production (brassicasterol, dinosterol) and river run-off (campesterol, beta-sitosterol) in the western Laptev Sea over the last ~17 ka with unprecedented tempor...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.854067 2023-05-15T14:26:18+02:00 Geochemical biomarker analyses on sediment cores PS51/154-11 and PS51/159-10 from the western Laptev Sea (Arctic Ocean) Hörner, Tanja Stein, Ruediger Fahl, Kirsten Birgel, Daniel MEDIAN LATITUDE: 77.057714 * MEDIAN LONGITUDE: 118.647762 * SOUTH-BOUND LATITUDE: 76.766667 * WEST-BOUND LONGITUDE: 116.031667 * NORTH-BOUND LATITUDE: 77.276000 * EAST-BOUND LONGITUDE: 120.609833 * DATE/TIME START: 1998-08-16T19:20:00 * DATE/TIME END: 1998-08-18T01:52:00 2016-10-20 application/zip, 7 datasets https://doi.pangaea.de/10.1594/PANGAEA.854067 https://doi.org/10.1594/PANGAEA.854067 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.854067 https://doi.org/10.1594/PANGAEA.854067 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Hörner, Tanja; Stein, Ruediger; Fahl, Kirsten; Birgel, Daniel (2016): Post-glacial variability of sea ice cover, river run-off and biological production in the western Laptev Sea (Arctic Ocean) – A high-resolution biomarker study. Quaternary Science Reviews, 143, 133-149, https://doi.org/10.1016/j.quascirev.2016.04.011 AWI_Paleo Paleoenvironmental Reconstructions from Marine Sediments @ AWI Dataset 2016 ftpangaea https://doi.org/10.1594/PANGAEA.854067 https://doi.org/10.1016/j.quascirev.2016.04.011 2023-01-20T07:33:36Z Multi-proxy biomarker measurements were applied on two sediment cores (PS51/154, PS51/159) to reconstruct sea ice cover (IP25), biological production (brassicasterol, dinosterol) and river run-off (campesterol, beta-sitosterol) in the western Laptev Sea over the last ~17 ka with unprecedented temporal resolution. The absence of IP25 from 17.2 to 15.5 ka, in combination with minimum concentration of phytoplankton biomarkers, suggests that the western Laptev Sea shelf was mostly covered with permanent sea ice. Very minor river run-off and restricted biological production occurred during this cold interval. From ~16 ka until 7.5 ka, a long-term decrease of terrigenous (riverine) organic matter and a coeval increase of marine organic matter reflect the gradual establishment of fully marine conditions in the western Laptev Sea, caused by the onset of the post-glacial transgression. Intensified river run-off and reduced sea ice cover characterized the time interval between 15.2 and 12.9 ka, including the Bølling/Allerød warm period (14.7-12.9 ka). Prominent peaks of the DIP25 Index coinciding with maximum abundances of subpolar foraminifers, are interpreted as pulses of Atlantic water inflow on the western Laptev Sea shelf. After the warm period, a sudden return to severe sea ice conditions with strongest ice-coverage between 11.9 and 11 ka coincided with the Younger Dryas (12.9-11.6 ka). At the onset of the Younger Dryas, a distinct alteration of the ecosystem (reflected in a distinct drop in terrigenous and phytoplankton biomarkers) was detected. During the last 7 ka, the sea ice proxies reflect a cooling of the Laptev Sea spring/summer season. This cooling trend was superimposed by a short-term variability in sea ice coverage, probably representing Bond cycles (1500 ± 500 ka) that are related to solar activity changes. Hence, atmospheric circulation changes were apparently able to affect the sea ice conditions on the Laptev Sea shelf under modern sea level conditions. Dataset Arctic Arctic Arctic Ocean laptev Laptev Sea Phytoplankton Sea ice PANGAEA - Data Publisher for Earth & Environmental Science Arctic Arctic Ocean Laptev Sea ENVELOPE(116.031667,120.609833,77.276000,76.766667) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
AWI_Paleo Paleoenvironmental Reconstructions from Marine Sediments @ AWI |
spellingShingle |
AWI_Paleo Paleoenvironmental Reconstructions from Marine Sediments @ AWI Hörner, Tanja Stein, Ruediger Fahl, Kirsten Birgel, Daniel Geochemical biomarker analyses on sediment cores PS51/154-11 and PS51/159-10 from the western Laptev Sea (Arctic Ocean) |
topic_facet |
AWI_Paleo Paleoenvironmental Reconstructions from Marine Sediments @ AWI |
description |
Multi-proxy biomarker measurements were applied on two sediment cores (PS51/154, PS51/159) to reconstruct sea ice cover (IP25), biological production (brassicasterol, dinosterol) and river run-off (campesterol, beta-sitosterol) in the western Laptev Sea over the last ~17 ka with unprecedented temporal resolution. The absence of IP25 from 17.2 to 15.5 ka, in combination with minimum concentration of phytoplankton biomarkers, suggests that the western Laptev Sea shelf was mostly covered with permanent sea ice. Very minor river run-off and restricted biological production occurred during this cold interval. From ~16 ka until 7.5 ka, a long-term decrease of terrigenous (riverine) organic matter and a coeval increase of marine organic matter reflect the gradual establishment of fully marine conditions in the western Laptev Sea, caused by the onset of the post-glacial transgression. Intensified river run-off and reduced sea ice cover characterized the time interval between 15.2 and 12.9 ka, including the Bølling/Allerød warm period (14.7-12.9 ka). Prominent peaks of the DIP25 Index coinciding with maximum abundances of subpolar foraminifers, are interpreted as pulses of Atlantic water inflow on the western Laptev Sea shelf. After the warm period, a sudden return to severe sea ice conditions with strongest ice-coverage between 11.9 and 11 ka coincided with the Younger Dryas (12.9-11.6 ka). At the onset of the Younger Dryas, a distinct alteration of the ecosystem (reflected in a distinct drop in terrigenous and phytoplankton biomarkers) was detected. During the last 7 ka, the sea ice proxies reflect a cooling of the Laptev Sea spring/summer season. This cooling trend was superimposed by a short-term variability in sea ice coverage, probably representing Bond cycles (1500 ± 500 ka) that are related to solar activity changes. Hence, atmospheric circulation changes were apparently able to affect the sea ice conditions on the Laptev Sea shelf under modern sea level conditions. |
format |
Dataset |
author |
Hörner, Tanja Stein, Ruediger Fahl, Kirsten Birgel, Daniel |
author_facet |
Hörner, Tanja Stein, Ruediger Fahl, Kirsten Birgel, Daniel |
author_sort |
Hörner, Tanja |
title |
Geochemical biomarker analyses on sediment cores PS51/154-11 and PS51/159-10 from the western Laptev Sea (Arctic Ocean) |
title_short |
Geochemical biomarker analyses on sediment cores PS51/154-11 and PS51/159-10 from the western Laptev Sea (Arctic Ocean) |
title_full |
Geochemical biomarker analyses on sediment cores PS51/154-11 and PS51/159-10 from the western Laptev Sea (Arctic Ocean) |
title_fullStr |
Geochemical biomarker analyses on sediment cores PS51/154-11 and PS51/159-10 from the western Laptev Sea (Arctic Ocean) |
title_full_unstemmed |
Geochemical biomarker analyses on sediment cores PS51/154-11 and PS51/159-10 from the western Laptev Sea (Arctic Ocean) |
title_sort |
geochemical biomarker analyses on sediment cores ps51/154-11 and ps51/159-10 from the western laptev sea (arctic ocean) |
publisher |
PANGAEA |
publishDate |
2016 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.854067 https://doi.org/10.1594/PANGAEA.854067 |
op_coverage |
MEDIAN LATITUDE: 77.057714 * MEDIAN LONGITUDE: 118.647762 * SOUTH-BOUND LATITUDE: 76.766667 * WEST-BOUND LONGITUDE: 116.031667 * NORTH-BOUND LATITUDE: 77.276000 * EAST-BOUND LONGITUDE: 120.609833 * DATE/TIME START: 1998-08-16T19:20:00 * DATE/TIME END: 1998-08-18T01:52:00 |
long_lat |
ENVELOPE(116.031667,120.609833,77.276000,76.766667) |
geographic |
Arctic Arctic Ocean Laptev Sea |
geographic_facet |
Arctic Arctic Ocean Laptev Sea |
genre |
Arctic Arctic Arctic Ocean laptev Laptev Sea Phytoplankton Sea ice |
genre_facet |
Arctic Arctic Arctic Ocean laptev Laptev Sea Phytoplankton Sea ice |
op_source |
Supplement to: Hörner, Tanja; Stein, Ruediger; Fahl, Kirsten; Birgel, Daniel (2016): Post-glacial variability of sea ice cover, river run-off and biological production in the western Laptev Sea (Arctic Ocean) – A high-resolution biomarker study. Quaternary Science Reviews, 143, 133-149, https://doi.org/10.1016/j.quascirev.2016.04.011 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.854067 https://doi.org/10.1594/PANGAEA.854067 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.854067 https://doi.org/10.1016/j.quascirev.2016.04.011 |
_version_ |
1766298797363691520 |