Stable isotopes, Mg/Ca-ratios, and biogenic opal of five sediment cores from the subarctic northwest Pacific
Based on models and proxy data it has been proposed that salinity-driven stratification weakened in the subarctic North Pacific during the last deglaciation, which potentially contributed to the deglacial rise in atmospheric carbon dioxide. We present high-resolution subsurface temperature (TMg/Ca)...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.786258 2023-05-15T17:14:58+02:00 Stable isotopes, Mg/Ca-ratios, and biogenic opal of five sediment cores from the subarctic northwest Pacific Riethdorf, Jan-Rainer Max, Lars Nürnberg, Dirk Lembke-Jene, Lester Tiedemann, Ralf MEDIAN LATITUDE: 55.303166 * MEDIAN LONGITUDE: 165.628140 * SOUTH-BOUND LATITUDE: 49.375667 * WEST-BOUND LONGITUDE: 152.877933 * NORTH-BOUND LATITUDE: 58.875333 * EAST-BOUND LONGITUDE: 170.698833 * DATE/TIME START: 2002-07-20T00:55:00 * DATE/TIME END: 2009-09-22T00:06:00 2013-02-04 application/zip, 14 datasets https://doi.pangaea.de/10.1594/PANGAEA.786258 https://doi.org/10.1594/PANGAEA.786258 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.786258 https://doi.org/10.1594/PANGAEA.786258 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Riethdorf, Jan-Rainer; Max, Lars; Nürnberg, Dirk; Lembke-Jene, Lester; Tiedemann, Ralf (2013): Deglacial development of (sub) sea surface temperature and salinity in the subarctic northwest Pacific: Implications for upper-ocean stratification. Paleoceanography, 28(1), 91-104, https://doi.org/10.1002/palo.20014 Dataset 2013 ftpangaea https://doi.org/10.1594/PANGAEA.786258 https://doi.org/10.1002/palo.20014 2023-01-20T07:32:37Z Based on models and proxy data it has been proposed that salinity-driven stratification weakened in the subarctic North Pacific during the last deglaciation, which potentially contributed to the deglacial rise in atmospheric carbon dioxide. We present high-resolution subsurface temperature (TMg/Ca) and subsurface salinity-approximating (d18Oivc-sw) records across the last 20,000 years from the subarctic North Pacific and its marginal seas, derived from combined stable oxygen isotopes and Mg/Ca ratios of the planktonic foraminiferal species Neogloboquadrina pachyderma (sin.). Our results indicate regionally differing changes of subsurface conditions. During the Heinrich Stadial 1 and the Younger Dryas cold phases our sites were subject to reduced thermal stratification, brine rejection due to sea-ice formation, and increased advection of low-salinity water from the Alaskan Stream. In contrast, the Bølling-Allerød warm phase was characterized by strengthened thermal stratification, stronger sea-ice melting, and influence of surface waters that were less diluted by the Alaskan Stream. From direct comparison with alkenone-based sea surface temperature estimates (SSTUk'37), we suggest deglacial thermocline changes that were closely related to changes in seasonal contrasts and stratification of the mixed layer. The modern upper-ocean conditions seem to have developed only since the early Holocene. Dataset Neogloboquadrina pachyderma Sea ice Subarctic PANGAEA - Data Publisher for Earth & Environmental Science Pacific ENVELOPE(152.877933,170.698833,58.875333,49.375667) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
description |
Based on models and proxy data it has been proposed that salinity-driven stratification weakened in the subarctic North Pacific during the last deglaciation, which potentially contributed to the deglacial rise in atmospheric carbon dioxide. We present high-resolution subsurface temperature (TMg/Ca) and subsurface salinity-approximating (d18Oivc-sw) records across the last 20,000 years from the subarctic North Pacific and its marginal seas, derived from combined stable oxygen isotopes and Mg/Ca ratios of the planktonic foraminiferal species Neogloboquadrina pachyderma (sin.). Our results indicate regionally differing changes of subsurface conditions. During the Heinrich Stadial 1 and the Younger Dryas cold phases our sites were subject to reduced thermal stratification, brine rejection due to sea-ice formation, and increased advection of low-salinity water from the Alaskan Stream. In contrast, the Bølling-Allerød warm phase was characterized by strengthened thermal stratification, stronger sea-ice melting, and influence of surface waters that were less diluted by the Alaskan Stream. From direct comparison with alkenone-based sea surface temperature estimates (SSTUk'37), we suggest deglacial thermocline changes that were closely related to changes in seasonal contrasts and stratification of the mixed layer. The modern upper-ocean conditions seem to have developed only since the early Holocene. |
format |
Dataset |
author |
Riethdorf, Jan-Rainer Max, Lars Nürnberg, Dirk Lembke-Jene, Lester Tiedemann, Ralf |
spellingShingle |
Riethdorf, Jan-Rainer Max, Lars Nürnberg, Dirk Lembke-Jene, Lester Tiedemann, Ralf Stable isotopes, Mg/Ca-ratios, and biogenic opal of five sediment cores from the subarctic northwest Pacific |
author_facet |
Riethdorf, Jan-Rainer Max, Lars Nürnberg, Dirk Lembke-Jene, Lester Tiedemann, Ralf |
author_sort |
Riethdorf, Jan-Rainer |
title |
Stable isotopes, Mg/Ca-ratios, and biogenic opal of five sediment cores from the subarctic northwest Pacific |
title_short |
Stable isotopes, Mg/Ca-ratios, and biogenic opal of five sediment cores from the subarctic northwest Pacific |
title_full |
Stable isotopes, Mg/Ca-ratios, and biogenic opal of five sediment cores from the subarctic northwest Pacific |
title_fullStr |
Stable isotopes, Mg/Ca-ratios, and biogenic opal of five sediment cores from the subarctic northwest Pacific |
title_full_unstemmed |
Stable isotopes, Mg/Ca-ratios, and biogenic opal of five sediment cores from the subarctic northwest Pacific |
title_sort |
stable isotopes, mg/ca-ratios, and biogenic opal of five sediment cores from the subarctic northwest pacific |
publisher |
PANGAEA |
publishDate |
2013 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.786258 https://doi.org/10.1594/PANGAEA.786258 |
op_coverage |
MEDIAN LATITUDE: 55.303166 * MEDIAN LONGITUDE: 165.628140 * SOUTH-BOUND LATITUDE: 49.375667 * WEST-BOUND LONGITUDE: 152.877933 * NORTH-BOUND LATITUDE: 58.875333 * EAST-BOUND LONGITUDE: 170.698833 * DATE/TIME START: 2002-07-20T00:55:00 * DATE/TIME END: 2009-09-22T00:06:00 |
long_lat |
ENVELOPE(152.877933,170.698833,58.875333,49.375667) |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Neogloboquadrina pachyderma Sea ice Subarctic |
genre_facet |
Neogloboquadrina pachyderma Sea ice Subarctic |
op_source |
Supplement to: Riethdorf, Jan-Rainer; Max, Lars; Nürnberg, Dirk; Lembke-Jene, Lester; Tiedemann, Ralf (2013): Deglacial development of (sub) sea surface temperature and salinity in the subarctic northwest Pacific: Implications for upper-ocean stratification. Paleoceanography, 28(1), 91-104, https://doi.org/10.1002/palo.20014 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.786258 https://doi.org/10.1594/PANGAEA.786258 |
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.786258 https://doi.org/10.1002/palo.20014 |
_version_ |
1766073094643908608 |