(Table 1) Age determination of Chukchi Sea sediments
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...
Main Authors: | , , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
2005
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.835175 https://doi.org/10.1594/PANGAEA.835175 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.835175 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.835175 2023-05-15T14:25:09+02:00 (Table 1) Age determination of Chukchi Sea sediments de Vernal, Anne Hillaire-Marcel, Claude Darby, Dennis A MEDIAN LATITUDE: 74.366633 * MEDIAN LONGITUDE: -170.000000 * SOUTH-BOUND LATITUDE: 73.683300 * WEST-BOUND LONGITUDE: -170.000000 * NORTH-BOUND LATITUDE: 75.733300 * EAST-BOUND LONGITUDE: -170.000000 * MINIMUM DEPTH, sediment/rock: 0.005 m * MAXIMUM DEPTH, sediment/rock: 1.350 m 2005-08-25 text/tab-separated-values, 115 data points https://doi.pangaea.de/10.1594/PANGAEA.835175 https://doi.org/10.1594/PANGAEA.835175 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.835175 https://doi.org/10.1594/PANGAEA.835175 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY 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, https://doi.org/10.1029/2005PA001157 Age 14C AMS 14C calibrated dated dated material dated standard deviation AR-92-B15 AR-92-B3 AR-92-P1 BC Box corer Chukchi Sea Depth bottom/max composite sediment/rock top/min Event label PC Piston corer Dataset 2005 ftpangaea https://doi.org/10.1594/PANGAEA.835175 https://doi.org/10.1029/2005PA001157 2023-01-20T09:03:39Z 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 Bering Sea Chukchi Chukchi Sea Neogloboquadrina pachyderma North Atlantic Sea ice PANGAEA - Data Publisher for Earth & Environmental Science Arctic Bering Sea Chukchi Sea ENVELOPE(-170.000000,-170.000000,75.733300,73.683300) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Age 14C AMS 14C calibrated dated dated material dated standard deviation AR-92-B15 AR-92-B3 AR-92-P1 BC Box corer Chukchi Sea Depth bottom/max composite sediment/rock top/min Event label PC Piston corer |
spellingShingle |
Age 14C AMS 14C calibrated dated dated material dated standard deviation AR-92-B15 AR-92-B3 AR-92-P1 BC Box corer Chukchi Sea Depth bottom/max composite sediment/rock top/min Event label PC Piston corer de Vernal, Anne Hillaire-Marcel, Claude Darby, Dennis A (Table 1) Age determination of Chukchi Sea sediments |
topic_facet |
Age 14C AMS 14C calibrated dated dated material dated standard deviation AR-92-B15 AR-92-B3 AR-92-P1 BC Box corer Chukchi Sea Depth bottom/max composite sediment/rock top/min Event label PC Piston corer |
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 |
title_short |
(Table 1) Age determination of Chukchi Sea sediments |
title_full |
(Table 1) Age determination of Chukchi Sea sediments |
title_fullStr |
(Table 1) Age determination of Chukchi Sea sediments |
title_full_unstemmed |
(Table 1) Age determination of Chukchi Sea sediments |
title_sort |
(table 1) age determination of chukchi sea sediments |
publisher |
PANGAEA |
publishDate |
2005 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.835175 https://doi.org/10.1594/PANGAEA.835175 |
op_coverage |
MEDIAN LATITUDE: 74.366633 * MEDIAN LONGITUDE: -170.000000 * SOUTH-BOUND LATITUDE: 73.683300 * WEST-BOUND LONGITUDE: -170.000000 * NORTH-BOUND LATITUDE: 75.733300 * EAST-BOUND LONGITUDE: -170.000000 * MINIMUM DEPTH, sediment/rock: 0.005 m * MAXIMUM DEPTH, sediment/rock: 1.350 m |
long_lat |
ENVELOPE(-170.000000,-170.000000,75.733300,73.683300) |
geographic |
Arctic Bering Sea Chukchi Sea |
geographic_facet |
Arctic Bering Sea Chukchi Sea |
genre |
Arctic Arctic Bering Sea Chukchi Chukchi Sea Neogloboquadrina pachyderma North Atlantic Sea ice |
genre_facet |
Arctic Arctic Bering Sea Chukchi Chukchi Sea Neogloboquadrina pachyderma North Atlantic Sea ice |
op_source |
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, https://doi.org/10.1029/2005PA001157 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.835175 https://doi.org/10.1594/PANGAEA.835175 |
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.835175 https://doi.org/10.1029/2005PA001157 |
_version_ |
1766297572786307072 |