(Table 1) Age determination of Chukchi Sea sediments, supplement to: de Vernal, Anne; Hillaire-Marcel, Claude; Darby, Dennis A (2005): Variability of sea ice cover in the Chukchi Sea (western Arctic Ocean) during the Holocene. Paleoceanography, 20(4), PA4018
Dinocysts from cores collected in the Chukchi Sea from the shelf edge to the lower slope were used to reconstruct changes in sea surface conditions and sea ice cover using modern analogue techniques. Holocene sequences have been recovered in a down-slope core (B15: 2135 m, 75°44'N, sedimentatio...
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ftdatacite:10.1594/pangaea.835175 2023-05-15T15:04:57+02:00 (Table 1) Age determination of Chukchi Sea sediments, supplement to: de Vernal, Anne; Hillaire-Marcel, Claude; Darby, Dennis A (2005): Variability of sea ice cover in the Chukchi Sea (western Arctic Ocean) during the Holocene. Paleoceanography, 20(4), PA4018 de Vernal, Anne Hillaire-Marcel, Claude Darby, Dennis A 2005 text/tab-separated-values https://dx.doi.org/10.1594/pangaea.835175 https://doi.pangaea.de/10.1594/PANGAEA.835175 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1029/2005pa001157 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Event label DEPTH, sediment/rock Depth, top/min Depth, bottom/max Depth, composite Age, dated material Age, dated Age, dated standard deviation Box corer Piston corer Age, 14C AMS Age, 14C calibrated Dataset dataset Supplementary Dataset 2005 ftdatacite https://doi.org/10.1594/pangaea.835175 https://doi.org/10.1029/2005pa001157 2022-02-09T13:17:41Z Dinocysts from cores collected in the Chukchi Sea from the shelf edge to the lower slope were used to reconstruct changes in sea surface conditions and sea ice cover using modern analogue techniques. Holocene sequences have been recovered in a down-slope core (B15: 2135 m, 75°44'N, sedimentation rate of ~1 cm/kyr) and in a shelf core (P1: 201 m, 73°41'N, sedimentation rate of ~22 cm/kyr). The shelf record spanning about 8000 years suggests high-frequency centennial oscillations of sea surface conditions and a significant reduction of the sea ice at circa 6000 and 2500 calendar (cal) years B.P. The condensed offshore record (B15) reveals an early postglacial optimum with minimum sea ice cover prior to 12,000 cal years B.P., which corresponds to a terrestrial climate optimum in Bering Sea area. Dinocyst data indicate extensive sea ice cover (>10 months/yr) from 12,000 to 6000 cal years B.P. followed by a general trend of decreasing sea ice and increasing sea surface salinity conditions, superimposed on large-amplitude millennial-scale oscillations. In contrast, d18O data in mesopelagic foraminifers (Neogloboquadrina pachyderma) and benthic foraminifers (Cibicides wuellerstorfi) reveal maximum subsurface temperature and thus maximum inflow of the North Atlantic water around 8000 cal years B.P., followed by a trend toward cooling of the subsurface to bottom water masses. Sea-surface to subsurface conditions estimated from dinocysts and d18O data in foraminifers thus suggest a decoupling between the surface water layer and the intermediate North Atlantic water mass with the existence of a sharp halocline and a reverse thermocline, especially before 6000 years B.P. The overall data and sea ice reconstructions from core B15 are consistent with strong sea ice convergence in the western Arctic during the early Holocene as suggested on the basis of climate model experiments including sea ice dynamics, matching a higher inflow rate of North Atlantic Water. Dataset Arctic Arctic Ocean Bering Sea Chukchi Chukchi Sea Neogloboquadrina pachyderma North Atlantic Sea ice DataCite Metadata Store (German National Library of Science and Technology) Arctic Arctic Ocean Bering Sea Chukchi Sea Darby ENVELOPE(162.217,162.217,-77.667,-77.667) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Event label DEPTH, sediment/rock Depth, top/min Depth, bottom/max Depth, composite Age, dated material Age, dated Age, dated standard deviation Box corer Piston corer Age, 14C AMS Age, 14C calibrated |
spellingShingle |
Event label DEPTH, sediment/rock Depth, top/min Depth, bottom/max Depth, composite Age, dated material Age, dated Age, dated standard deviation Box corer Piston corer Age, 14C AMS Age, 14C calibrated de Vernal, Anne Hillaire-Marcel, Claude Darby, Dennis A (Table 1) Age determination of Chukchi Sea sediments, supplement to: de Vernal, Anne; Hillaire-Marcel, Claude; Darby, Dennis A (2005): Variability of sea ice cover in the Chukchi Sea (western Arctic Ocean) during the Holocene. Paleoceanography, 20(4), PA4018 |
topic_facet |
Event label DEPTH, sediment/rock Depth, top/min Depth, bottom/max Depth, composite Age, dated material Age, dated Age, dated standard deviation Box corer Piston corer Age, 14C AMS Age, 14C calibrated |
description |
Dinocysts from cores collected in the Chukchi Sea from the shelf edge to the lower slope were used to reconstruct changes in sea surface conditions and sea ice cover using modern analogue techniques. Holocene sequences have been recovered in a down-slope core (B15: 2135 m, 75°44'N, sedimentation rate of ~1 cm/kyr) and in a shelf core (P1: 201 m, 73°41'N, sedimentation rate of ~22 cm/kyr). The shelf record spanning about 8000 years suggests high-frequency centennial oscillations of sea surface conditions and a significant reduction of the sea ice at circa 6000 and 2500 calendar (cal) years B.P. The condensed offshore record (B15) reveals an early postglacial optimum with minimum sea ice cover prior to 12,000 cal years B.P., which corresponds to a terrestrial climate optimum in Bering Sea area. Dinocyst data indicate extensive sea ice cover (>10 months/yr) from 12,000 to 6000 cal years B.P. followed by a general trend of decreasing sea ice and increasing sea surface salinity conditions, superimposed on large-amplitude millennial-scale oscillations. In contrast, d18O data in mesopelagic foraminifers (Neogloboquadrina pachyderma) and benthic foraminifers (Cibicides wuellerstorfi) reveal maximum subsurface temperature and thus maximum inflow of the North Atlantic water around 8000 cal years B.P., followed by a trend toward cooling of the subsurface to bottom water masses. Sea-surface to subsurface conditions estimated from dinocysts and d18O data in foraminifers thus suggest a decoupling between the surface water layer and the intermediate North Atlantic water mass with the existence of a sharp halocline and a reverse thermocline, especially before 6000 years B.P. The overall data and sea ice reconstructions from core B15 are consistent with strong sea ice convergence in the western Arctic during the early Holocene as suggested on the basis of climate model experiments including sea ice dynamics, matching a higher inflow rate of North Atlantic Water. |
format |
Dataset |
author |
de Vernal, Anne Hillaire-Marcel, Claude Darby, Dennis A |
author_facet |
de Vernal, Anne Hillaire-Marcel, Claude Darby, Dennis A |
author_sort |
de Vernal, Anne |
title |
(Table 1) Age determination of Chukchi Sea sediments, supplement to: de Vernal, Anne; Hillaire-Marcel, Claude; Darby, Dennis A (2005): Variability of sea ice cover in the Chukchi Sea (western Arctic Ocean) during the Holocene. Paleoceanography, 20(4), PA4018 |
title_short |
(Table 1) Age determination of Chukchi Sea sediments, supplement to: de Vernal, Anne; Hillaire-Marcel, Claude; Darby, Dennis A (2005): Variability of sea ice cover in the Chukchi Sea (western Arctic Ocean) during the Holocene. Paleoceanography, 20(4), PA4018 |
title_full |
(Table 1) Age determination of Chukchi Sea sediments, supplement to: de Vernal, Anne; Hillaire-Marcel, Claude; Darby, Dennis A (2005): Variability of sea ice cover in the Chukchi Sea (western Arctic Ocean) during the Holocene. Paleoceanography, 20(4), PA4018 |
title_fullStr |
(Table 1) Age determination of Chukchi Sea sediments, supplement to: de Vernal, Anne; Hillaire-Marcel, Claude; Darby, Dennis A (2005): Variability of sea ice cover in the Chukchi Sea (western Arctic Ocean) during the Holocene. Paleoceanography, 20(4), PA4018 |
title_full_unstemmed |
(Table 1) Age determination of Chukchi Sea sediments, supplement to: de Vernal, Anne; Hillaire-Marcel, Claude; Darby, Dennis A (2005): Variability of sea ice cover in the Chukchi Sea (western Arctic Ocean) during the Holocene. Paleoceanography, 20(4), PA4018 |
title_sort |
(table 1) age determination of chukchi sea sediments, supplement to: de vernal, anne; hillaire-marcel, claude; darby, dennis a (2005): variability of sea ice cover in the chukchi sea (western arctic ocean) during the holocene. paleoceanography, 20(4), pa4018 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2005 |
url |
https://dx.doi.org/10.1594/pangaea.835175 https://doi.pangaea.de/10.1594/PANGAEA.835175 |
long_lat |
ENVELOPE(162.217,162.217,-77.667,-77.667) |
geographic |
Arctic Arctic Ocean Bering Sea Chukchi Sea Darby |
geographic_facet |
Arctic Arctic Ocean Bering Sea Chukchi Sea Darby |
genre |
Arctic Arctic Ocean Bering Sea Chukchi Chukchi Sea Neogloboquadrina pachyderma North Atlantic Sea ice |
genre_facet |
Arctic Arctic Ocean Bering Sea Chukchi Chukchi Sea Neogloboquadrina pachyderma North Atlantic Sea ice |
op_relation |
https://dx.doi.org/10.1029/2005pa001157 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.835175 https://doi.org/10.1029/2005pa001157 |
_version_ |
1766336722476466176 |