Middle to late Holocene paleoproductivity reconstructions for the western Barents Sea: a model-data comparison
Published version also available at http://dx.doi.org/10.1007/s41063-015-0002-z In this study we focus on late Holocene primary productivity (PP) variability in the western Barents Sea and its response to variable sea ice coverage by combining PP reconstructed from several sediment cores with region...
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ftunivtroemsoe:oai:munin.uit.no:10037/9022 2023-05-15T14:23:34+02:00 Middle to late Holocene paleoproductivity reconstructions for the western Barents Sea: a model-data comparison Pathirana, Irene Dorothea Knies, Jochen Felix, Maarten Mann, U. Ellingsen, Ingrid H. 2015-11-30 https://hdl.handle.net/10037/9022 https://doi.org/10.1007/s41063-015-0002-z eng eng Springer Notur/NorStore: NN2967K Norges forskningsråd: 223259 arktos The Journal of Arctic Geosciences 2015, 1(1) FRIDAID 1300566 doi:10.1007/s41063-015-0002-z 2364-9453 https://hdl.handle.net/10037/9022 URN:NBN:no-uit_munin_8585 openAccess Primary productivity Holocene Barents Sea VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 Journal article Tidsskriftartikkel Peer reviewed 2015 ftunivtroemsoe https://doi.org/10.1007/s41063-015-0002-z 2021-06-25T17:54:40Z Published version also available at http://dx.doi.org/10.1007/s41063-015-0002-z In this study we focus on late Holocene primary productivity (PP) variability in the western Barents Sea and its response to variable sea ice coverage by combining PP reconstructed from several sediment cores with regional PP trends simulated with a well-constrained organic facies model, OF-Mod 3D. We find that modern production rates reconstructed from buried marine organic matter (‘‘bottomup’’) resemble simulated export production at 50 m water depth inferred from numerical simulations of surface water PP in a 3D ocean model, SINMOD (‘‘top-down’’). Paleoproductivity rates in the northern Barents Sea are more variable and generally higher (30–150 gC m-2 year-1 ) than in the SW Barents Sea region (\75 gC m-2 year-1 ) throughout the last 6000 years BP. In the SW Barents Sea, PP rates and terrestrial organic matter (TOM) supply remain constantly low indicating present-day-like oceanographic conditions with only marginal influence of sea ice related processes during the last 6000 years BP. PP rates in the northern Barents Sea indicate a shift from stable modern-like conditions prior to 2800 BP to denser, more permanent sea ice coverage along the marginal ice zone (MIZ) between 2800 and 1000 years BP and low PP rates. PP rates increase around 1000 years BP indicating a northward shift of the MIZ and accelerated export towards the seabed. During the last 500 years a pronounced decline in PP rates towards the present day indicates reduced annual duration of the MIZ in the area due to global warming. Our results suggest that a combination of first-year ice and higher PP in a warming pan-Arctic may point to a potential Arctic carbon sink while sea ice is still present. Article in Journal/Newspaper Arctic Arctic Barents Sea Global warming Sea ice University of Tromsø: Munin Open Research Archive Arctic Barents Sea arktos 1 1 |
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Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
Primary productivity Holocene Barents Sea VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 |
spellingShingle |
Primary productivity Holocene Barents Sea VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 Pathirana, Irene Dorothea Knies, Jochen Felix, Maarten Mann, U. Ellingsen, Ingrid H. Middle to late Holocene paleoproductivity reconstructions for the western Barents Sea: a model-data comparison |
topic_facet |
Primary productivity Holocene Barents Sea VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 VDP::Mathematics and natural science: 400::Geosciences: 450 |
description |
Published version also available at http://dx.doi.org/10.1007/s41063-015-0002-z In this study we focus on late Holocene primary productivity (PP) variability in the western Barents Sea and its response to variable sea ice coverage by combining PP reconstructed from several sediment cores with regional PP trends simulated with a well-constrained organic facies model, OF-Mod 3D. We find that modern production rates reconstructed from buried marine organic matter (‘‘bottomup’’) resemble simulated export production at 50 m water depth inferred from numerical simulations of surface water PP in a 3D ocean model, SINMOD (‘‘top-down’’). Paleoproductivity rates in the northern Barents Sea are more variable and generally higher (30–150 gC m-2 year-1 ) than in the SW Barents Sea region (\75 gC m-2 year-1 ) throughout the last 6000 years BP. In the SW Barents Sea, PP rates and terrestrial organic matter (TOM) supply remain constantly low indicating present-day-like oceanographic conditions with only marginal influence of sea ice related processes during the last 6000 years BP. PP rates in the northern Barents Sea indicate a shift from stable modern-like conditions prior to 2800 BP to denser, more permanent sea ice coverage along the marginal ice zone (MIZ) between 2800 and 1000 years BP and low PP rates. PP rates increase around 1000 years BP indicating a northward shift of the MIZ and accelerated export towards the seabed. During the last 500 years a pronounced decline in PP rates towards the present day indicates reduced annual duration of the MIZ in the area due to global warming. Our results suggest that a combination of first-year ice and higher PP in a warming pan-Arctic may point to a potential Arctic carbon sink while sea ice is still present. |
format |
Article in Journal/Newspaper |
author |
Pathirana, Irene Dorothea Knies, Jochen Felix, Maarten Mann, U. Ellingsen, Ingrid H. |
author_facet |
Pathirana, Irene Dorothea Knies, Jochen Felix, Maarten Mann, U. Ellingsen, Ingrid H. |
author_sort |
Pathirana, Irene Dorothea |
title |
Middle to late Holocene paleoproductivity reconstructions for the western Barents Sea: a model-data comparison |
title_short |
Middle to late Holocene paleoproductivity reconstructions for the western Barents Sea: a model-data comparison |
title_full |
Middle to late Holocene paleoproductivity reconstructions for the western Barents Sea: a model-data comparison |
title_fullStr |
Middle to late Holocene paleoproductivity reconstructions for the western Barents Sea: a model-data comparison |
title_full_unstemmed |
Middle to late Holocene paleoproductivity reconstructions for the western Barents Sea: a model-data comparison |
title_sort |
middle to late holocene paleoproductivity reconstructions for the western barents sea: a model-data comparison |
publisher |
Springer |
publishDate |
2015 |
url |
https://hdl.handle.net/10037/9022 https://doi.org/10.1007/s41063-015-0002-z |
geographic |
Arctic Barents Sea |
geographic_facet |
Arctic Barents Sea |
genre |
Arctic Arctic Barents Sea Global warming Sea ice |
genre_facet |
Arctic Arctic Barents Sea Global warming Sea ice |
op_relation |
Notur/NorStore: NN2967K Norges forskningsråd: 223259 arktos The Journal of Arctic Geosciences 2015, 1(1) FRIDAID 1300566 doi:10.1007/s41063-015-0002-z 2364-9453 https://hdl.handle.net/10037/9022 URN:NBN:no-uit_munin_8585 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1007/s41063-015-0002-z |
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arktos |
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1 |
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1 |
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1766296088923340800 |