Holocene sea subsurface and surface water masses in the Fram Strait – Comparisons of temperature and sea-ice reconstructions
Two high-resolution sediment cores from eastern Fram Strait have been investigated for sea subsurface and surface temperature variability during the Holocene (the past ca 12,000 years). The transfer function developed by Husum and Hald (2012) has been applied to sediment cores in order to reconstruc...
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Online Access: | https://epic.awi.de/id/eprint/38924/ https://doi.org/10.1016/j.quascirev.2015.09.007 https://hdl.handle.net/10013/epic.48921 |
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ftawi:oai:epic.awi.de:38924 2023-05-15T16:18:05+02:00 Holocene sea subsurface and surface water masses in the Fram Strait – Comparisons of temperature and sea-ice reconstructions Werner, Kirstin Müller, Juliane Husum, Katrine Spielhagen, Robert F. Kandiano, Evgenia S. Polyak, Leonid 2016 https://epic.awi.de/id/eprint/38924/ https://doi.org/10.1016/j.quascirev.2015.09.007 https://hdl.handle.net/10013/epic.48921 unknown PERGAMON-ELSEVIER SCIENCE LTD Werner, K. orcid:0000-0001-5260-0348 , Müller, J. orcid:0000-0003-0724-4131 , Husum, K. , Spielhagen, R. F. , Kandiano, E. S. and Polyak, L. (2016) Holocene sea subsurface and surface water masses in the Fram Strait – Comparisons of temperature and sea-ice reconstructions , Quaternary Science Reviews, 147 , pp. 194-209 . doi:10.1016/j.quascirev.2015.09.007 <https://doi.org/10.1016/j.quascirev.2015.09.007> , hdl:10013/epic.48921 EPIC3Quaternary Science Reviews, PERGAMON-ELSEVIER SCIENCE LTD, 147, pp. 194-209, ISSN: 0277-3791 Article isiRev 2016 ftawi https://doi.org/10.1016/j.quascirev.2015.09.007 2021-12-24T15:40:48Z Two high-resolution sediment cores from eastern Fram Strait have been investigated for sea subsurface and surface temperature variability during the Holocene (the past ca 12,000 years). The transfer function developed by Husum and Hald (2012) has been applied to sediment cores in order to reconstruct fluctuations of sea subsurface temperatures throughout the period. Additional biomarker and foraminiferal proxy data are used to elucidate variability between surface and subsurface water mass conditions, and to conclude on the Holocene climate and oceanographic variability on the West Spitsbergen continental margin. Results consistently reveal warm sea surface to subsurface temperatures of up to 6 °C until ca 5 cal ka BP, with maximum seawater temperatures around 10 cal ka BP, likely related to maximum July insolation occurring at that time. Maximum Atlantic Water (AW) advection occurred at surface and subsurface between 10.6 and 8.5 cal ka BP based on both foraminiferal and dinocyst temperature reconstructions. Probably, a less-stratified, ice-free, nutrient-rich surface ocean with strong AW advection prevailed in the eastern Fram Strait between 10 and 9 cal ka BP. Weakened AW contribution is found after ca 5 cal ka BP when subsurface temperatures strongly decrease with minimum values between ca 4 and 3 cal ka BP. Cold late Holocene conditions are furthermore supported by high planktic foraminifer shell fragmentation and high δ18O values of the subpolar planktic foraminifer species Turborotalita quinqueloba. While IP25-associated indices as well as dinocyst data suggest a sustained cooling due to a decrease in early summer insolation and consequently sea-ice increase since about 7 cal ka BP in surface waters, planktic foraminiferal data including stable isotopes indicate a slight return of stronger subsurface AW influx since ca 3 cal ka BP. The observed decoupling of surface and subsurface waters during the later Holocene is most likely attributed to a strong pycnocline layer separating cold sea-ice fed surface waters from enhanced subsurface AW advection. This may be related to changes in North Atlantic subpolar versus subtropical gyre activity. Article in Journal/Newspaper Fram Strait North Atlantic Sea ice Spitsbergen Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Quaternary Science Reviews 147 194 209 |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Two high-resolution sediment cores from eastern Fram Strait have been investigated for sea subsurface and surface temperature variability during the Holocene (the past ca 12,000 years). The transfer function developed by Husum and Hald (2012) has been applied to sediment cores in order to reconstruct fluctuations of sea subsurface temperatures throughout the period. Additional biomarker and foraminiferal proxy data are used to elucidate variability between surface and subsurface water mass conditions, and to conclude on the Holocene climate and oceanographic variability on the West Spitsbergen continental margin. Results consistently reveal warm sea surface to subsurface temperatures of up to 6 °C until ca 5 cal ka BP, with maximum seawater temperatures around 10 cal ka BP, likely related to maximum July insolation occurring at that time. Maximum Atlantic Water (AW) advection occurred at surface and subsurface between 10.6 and 8.5 cal ka BP based on both foraminiferal and dinocyst temperature reconstructions. Probably, a less-stratified, ice-free, nutrient-rich surface ocean with strong AW advection prevailed in the eastern Fram Strait between 10 and 9 cal ka BP. Weakened AW contribution is found after ca 5 cal ka BP when subsurface temperatures strongly decrease with minimum values between ca 4 and 3 cal ka BP. Cold late Holocene conditions are furthermore supported by high planktic foraminifer shell fragmentation and high δ18O values of the subpolar planktic foraminifer species Turborotalita quinqueloba. While IP25-associated indices as well as dinocyst data suggest a sustained cooling due to a decrease in early summer insolation and consequently sea-ice increase since about 7 cal ka BP in surface waters, planktic foraminiferal data including stable isotopes indicate a slight return of stronger subsurface AW influx since ca 3 cal ka BP. The observed decoupling of surface and subsurface waters during the later Holocene is most likely attributed to a strong pycnocline layer separating cold sea-ice fed surface waters from enhanced subsurface AW advection. This may be related to changes in North Atlantic subpolar versus subtropical gyre activity. |
format |
Article in Journal/Newspaper |
author |
Werner, Kirstin Müller, Juliane Husum, Katrine Spielhagen, Robert F. Kandiano, Evgenia S. Polyak, Leonid |
spellingShingle |
Werner, Kirstin Müller, Juliane Husum, Katrine Spielhagen, Robert F. Kandiano, Evgenia S. Polyak, Leonid Holocene sea subsurface and surface water masses in the Fram Strait – Comparisons of temperature and sea-ice reconstructions |
author_facet |
Werner, Kirstin Müller, Juliane Husum, Katrine Spielhagen, Robert F. Kandiano, Evgenia S. Polyak, Leonid |
author_sort |
Werner, Kirstin |
title |
Holocene sea subsurface and surface water masses in the Fram Strait – Comparisons of temperature and sea-ice reconstructions |
title_short |
Holocene sea subsurface and surface water masses in the Fram Strait – Comparisons of temperature and sea-ice reconstructions |
title_full |
Holocene sea subsurface and surface water masses in the Fram Strait – Comparisons of temperature and sea-ice reconstructions |
title_fullStr |
Holocene sea subsurface and surface water masses in the Fram Strait – Comparisons of temperature and sea-ice reconstructions |
title_full_unstemmed |
Holocene sea subsurface and surface water masses in the Fram Strait – Comparisons of temperature and sea-ice reconstructions |
title_sort |
holocene sea subsurface and surface water masses in the fram strait – comparisons of temperature and sea-ice reconstructions |
publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
publishDate |
2016 |
url |
https://epic.awi.de/id/eprint/38924/ https://doi.org/10.1016/j.quascirev.2015.09.007 https://hdl.handle.net/10013/epic.48921 |
genre |
Fram Strait North Atlantic Sea ice Spitsbergen |
genre_facet |
Fram Strait North Atlantic Sea ice Spitsbergen |
op_source |
EPIC3Quaternary Science Reviews, PERGAMON-ELSEVIER SCIENCE LTD, 147, pp. 194-209, ISSN: 0277-3791 |
op_relation |
Werner, K. orcid:0000-0001-5260-0348 , Müller, J. orcid:0000-0003-0724-4131 , Husum, K. , Spielhagen, R. F. , Kandiano, E. S. and Polyak, L. (2016) Holocene sea subsurface and surface water masses in the Fram Strait – Comparisons of temperature and sea-ice reconstructions , Quaternary Science Reviews, 147 , pp. 194-209 . doi:10.1016/j.quascirev.2015.09.007 <https://doi.org/10.1016/j.quascirev.2015.09.007> , hdl:10013/epic.48921 |
op_doi |
https://doi.org/10.1016/j.quascirev.2015.09.007 |
container_title |
Quaternary Science Reviews |
container_volume |
147 |
container_start_page |
194 |
op_container_end_page |
209 |
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1766004182632890368 |