Stable isotope record of the Okhotsk Sea
Stable isotope data on benthic foraminifera from more than 30 cores on the northern Emperor Seamounts and in the Okhotsk Sea are synthesized in paleohydrographic profiles spanning the depth range 1000-4000 m. Holocene (core-top) benthic foraminiferal d18O and d13C data are calibrated to modern hydro...
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1998
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.857992 2023-05-15T17:52:38+02:00 Stable isotope record of the Okhotsk Sea Keigwin, Lloyd D MEDIAN LATITUDE: 51.074109 * MEDIAN LONGITUDE: 159.743814 * SOUTH-BOUND LATITUDE: 48.003200 * WEST-BOUND LONGITUDE: 142.451000 * NORTH-BOUND LATITUDE: 57.496200 * EAST-BOUND LONGITUDE: 168.136660 * DATE/TIME START: 1975-09-05T00:00:00 * DATE/TIME END: 1993-09-13T06:32:00 1998-02-08 application/zip, 11 datasets https://doi.pangaea.de/10.1594/PANGAEA.857992 https://doi.org/10.1594/PANGAEA.857992 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.857992 https://doi.org/10.1594/PANGAEA.857992 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Keigwin, Lloyd D (1998): Glacial-age hydrography of the far northwest Pacific Ocean. Paleoceanography, 13(4), 323-339, https://doi.org/10.1029/98PA00874 Dataset 1998 ftpangaea https://doi.org/10.1594/PANGAEA.857992 https://doi.org/10.1029/98PA00874 2023-01-20T07:33:40Z Stable isotope data on benthic foraminifera from more than 30 cores on the northern Emperor Seamounts and in the Okhotsk Sea are synthesized in paleohydrographic profiles spanning the depth range 1000-4000 m. Holocene (core-top) benthic foraminiferal d18O and d13C data are calibrated to modern hydrographic properties through measurements of d13C of SumCO2 and d18O of seawater. Cibicidoides stable isotope ratios are close to the d13C and equilibrium d18O of seawater, whereas Uvigerina d18O and d13C are variably offset from Cibicidoides. Glacial maximum d13C of Cibicidoides displays a different vertical profile than that of the Holocene. When results are adjusted by +0.32 per mil to account for the secular change in d13C during the last glacial maximum, the data coincide with the modern seawater and foraminiferal curves deeper than ~2 km. However, at shallower depths d13C gradually increases by as much as 1 per mil above the modern value. Furthermore, above 2 km the benthic d18O decreases by ~0.5 per mil. These results are consistent with a benthic front at ~2 km in the North Pacific (see Herguera et al., 1992), but they differ from interpretations based on trace metal data which indicate a source of nutrient-depleted deep water during glaciation. The isotopic data suggest that during glaciation there was a better ventilated watermass at intermediate depths in the far northwestern Pacific, it was relatively fresher than deep waters there, and deep waters were as nutrient-rich as today. Dataset okhotsk sea PANGAEA - Data Publisher for Earth & Environmental Science Okhotsk Pacific ENVELOPE(142.451000,168.136660,57.496200,48.003200) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
description |
Stable isotope data on benthic foraminifera from more than 30 cores on the northern Emperor Seamounts and in the Okhotsk Sea are synthesized in paleohydrographic profiles spanning the depth range 1000-4000 m. Holocene (core-top) benthic foraminiferal d18O and d13C data are calibrated to modern hydrographic properties through measurements of d13C of SumCO2 and d18O of seawater. Cibicidoides stable isotope ratios are close to the d13C and equilibrium d18O of seawater, whereas Uvigerina d18O and d13C are variably offset from Cibicidoides. Glacial maximum d13C of Cibicidoides displays a different vertical profile than that of the Holocene. When results are adjusted by +0.32 per mil to account for the secular change in d13C during the last glacial maximum, the data coincide with the modern seawater and foraminiferal curves deeper than ~2 km. However, at shallower depths d13C gradually increases by as much as 1 per mil above the modern value. Furthermore, above 2 km the benthic d18O decreases by ~0.5 per mil. These results are consistent with a benthic front at ~2 km in the North Pacific (see Herguera et al., 1992), but they differ from interpretations based on trace metal data which indicate a source of nutrient-depleted deep water during glaciation. The isotopic data suggest that during glaciation there was a better ventilated watermass at intermediate depths in the far northwestern Pacific, it was relatively fresher than deep waters there, and deep waters were as nutrient-rich as today. |
format |
Dataset |
author |
Keigwin, Lloyd D |
spellingShingle |
Keigwin, Lloyd D Stable isotope record of the Okhotsk Sea |
author_facet |
Keigwin, Lloyd D |
author_sort |
Keigwin, Lloyd D |
title |
Stable isotope record of the Okhotsk Sea |
title_short |
Stable isotope record of the Okhotsk Sea |
title_full |
Stable isotope record of the Okhotsk Sea |
title_fullStr |
Stable isotope record of the Okhotsk Sea |
title_full_unstemmed |
Stable isotope record of the Okhotsk Sea |
title_sort |
stable isotope record of the okhotsk sea |
publisher |
PANGAEA |
publishDate |
1998 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.857992 https://doi.org/10.1594/PANGAEA.857992 |
op_coverage |
MEDIAN LATITUDE: 51.074109 * MEDIAN LONGITUDE: 159.743814 * SOUTH-BOUND LATITUDE: 48.003200 * WEST-BOUND LONGITUDE: 142.451000 * NORTH-BOUND LATITUDE: 57.496200 * EAST-BOUND LONGITUDE: 168.136660 * DATE/TIME START: 1975-09-05T00:00:00 * DATE/TIME END: 1993-09-13T06:32:00 |
long_lat |
ENVELOPE(142.451000,168.136660,57.496200,48.003200) |
geographic |
Okhotsk Pacific |
geographic_facet |
Okhotsk Pacific |
genre |
okhotsk sea |
genre_facet |
okhotsk sea |
op_source |
Supplement to: Keigwin, Lloyd D (1998): Glacial-age hydrography of the far northwest Pacific Ocean. Paleoceanography, 13(4), 323-339, https://doi.org/10.1029/98PA00874 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.857992 https://doi.org/10.1594/PANGAEA.857992 |
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.857992 https://doi.org/10.1029/98PA00874 |
_version_ |
1766160324243750912 |