A multiproxy study of past environmental changes in the Sea of Okhotsk during the last 1.5 Ma
Long-chain diols have been detected in a wide range of environments and have been used to reconstruct past environmental changes, however only a few long-term records exist to date. Here we reconstructed past environmental changes in the central Sea of Okhotsk over the last 1.5 million years, coveri...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/387541 2023-11-12T04:26:04+01:00 A multiproxy study of past environmental changes in the Sea of Okhotsk during the last 1.5 Ma Lattaud, Julie Lo, Li Zeeden, Christian Liu, Ya Jun Song, Sheng Rong van der Meer, Marcel T.J. Sinninghe Damsté, Jaap S. Schouten, Stefan non-UU output of UU-AW members 2019-06 image/pdf https://dspace.library.uu.nl/handle/1874/387541 en eng 0146-6380 https://dspace.library.uu.nl/handle/1874/387541 info:eu-repo/semantics/OpenAccess Biogenic opal LDI Long-chain diols Mid-Pleistocene Transition Sea of Okhotsk TEX U Geochemistry and Petrology Article 2019 ftunivutrecht 2023-11-01T23:21:48Z Long-chain diols have been detected in a wide range of environments and have been used to reconstruct past environmental changes, however only a few long-term records exist to date. Here we reconstructed past environmental changes in the central Sea of Okhotsk over the last 1.5 million years, covering the Mid-Pleistocene Transition (MPT). Sea surface temperatures (SST) reconstructed using the Long-Chain Diol Index (LDI) reflects glacial/interglacial changes. However, when compared with other organic paleothermometers (Uk′ 37 and TEXL 86) the LDI-SST is lower during interglacials and similar or higher during glacials, possibly suggesting a shift of diol production season during interglacials. The LDI-SST does not change in periodicity around the MPT as observed for the TEXL 86, likely due to this seasonal shift. Diatom productivity, as recorded by 1,14-diols and biogenic opal content, increased during the main deglaciations with a succession from Proboscia diatoms to diatoms with a more heavily silicified shell, confirming that primary productivity in the central Sea of Okhotsk is driven by sea-ice progress and retreat. In contrast to the LDI-SST, the 1,14-diols record shows a change in periodicity around the MPT from 41- to 100-kyr cycle, suggesting an influence of orbital parameters on diatom productivity. In the central Sea of Okhotsk, the relative amount of C32 1,15-diol (FC32 1,15), a proxy for riverine input, correlates with sea-level change with more riverine-derived material reaching the core site when the Amur River mouth is closer at lower sea-levels. In agreement, FC32 1,15 shows a change in periodicity during the MPT, with the appearance of a 100-kyr cycle. Our results show that the long chain diols can provide important paleoceanographic information in subpolar environments over long time scales, but that temperature reconstructions can be severely impacted by changes in seasonality. Article in Journal/Newspaper Sea ice Utrecht University Repository Okhotsk |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Biogenic opal LDI Long-chain diols Mid-Pleistocene Transition Sea of Okhotsk TEX U Geochemistry and Petrology |
spellingShingle |
Biogenic opal LDI Long-chain diols Mid-Pleistocene Transition Sea of Okhotsk TEX U Geochemistry and Petrology Lattaud, Julie Lo, Li Zeeden, Christian Liu, Ya Jun Song, Sheng Rong van der Meer, Marcel T.J. Sinninghe Damsté, Jaap S. Schouten, Stefan A multiproxy study of past environmental changes in the Sea of Okhotsk during the last 1.5 Ma |
topic_facet |
Biogenic opal LDI Long-chain diols Mid-Pleistocene Transition Sea of Okhotsk TEX U Geochemistry and Petrology |
description |
Long-chain diols have been detected in a wide range of environments and have been used to reconstruct past environmental changes, however only a few long-term records exist to date. Here we reconstructed past environmental changes in the central Sea of Okhotsk over the last 1.5 million years, covering the Mid-Pleistocene Transition (MPT). Sea surface temperatures (SST) reconstructed using the Long-Chain Diol Index (LDI) reflects glacial/interglacial changes. However, when compared with other organic paleothermometers (Uk′ 37 and TEXL 86) the LDI-SST is lower during interglacials and similar or higher during glacials, possibly suggesting a shift of diol production season during interglacials. The LDI-SST does not change in periodicity around the MPT as observed for the TEXL 86, likely due to this seasonal shift. Diatom productivity, as recorded by 1,14-diols and biogenic opal content, increased during the main deglaciations with a succession from Proboscia diatoms to diatoms with a more heavily silicified shell, confirming that primary productivity in the central Sea of Okhotsk is driven by sea-ice progress and retreat. In contrast to the LDI-SST, the 1,14-diols record shows a change in periodicity around the MPT from 41- to 100-kyr cycle, suggesting an influence of orbital parameters on diatom productivity. In the central Sea of Okhotsk, the relative amount of C32 1,15-diol (FC32 1,15), a proxy for riverine input, correlates with sea-level change with more riverine-derived material reaching the core site when the Amur River mouth is closer at lower sea-levels. In agreement, FC32 1,15 shows a change in periodicity during the MPT, with the appearance of a 100-kyr cycle. Our results show that the long chain diols can provide important paleoceanographic information in subpolar environments over long time scales, but that temperature reconstructions can be severely impacted by changes in seasonality. |
author2 |
non-UU output of UU-AW members |
format |
Article in Journal/Newspaper |
author |
Lattaud, Julie Lo, Li Zeeden, Christian Liu, Ya Jun Song, Sheng Rong van der Meer, Marcel T.J. Sinninghe Damsté, Jaap S. Schouten, Stefan |
author_facet |
Lattaud, Julie Lo, Li Zeeden, Christian Liu, Ya Jun Song, Sheng Rong van der Meer, Marcel T.J. Sinninghe Damsté, Jaap S. Schouten, Stefan |
author_sort |
Lattaud, Julie |
title |
A multiproxy study of past environmental changes in the Sea of Okhotsk during the last 1.5 Ma |
title_short |
A multiproxy study of past environmental changes in the Sea of Okhotsk during the last 1.5 Ma |
title_full |
A multiproxy study of past environmental changes in the Sea of Okhotsk during the last 1.5 Ma |
title_fullStr |
A multiproxy study of past environmental changes in the Sea of Okhotsk during the last 1.5 Ma |
title_full_unstemmed |
A multiproxy study of past environmental changes in the Sea of Okhotsk during the last 1.5 Ma |
title_sort |
multiproxy study of past environmental changes in the sea of okhotsk during the last 1.5 ma |
publishDate |
2019 |
url |
https://dspace.library.uu.nl/handle/1874/387541 |
geographic |
Okhotsk |
geographic_facet |
Okhotsk |
genre |
Sea ice |
genre_facet |
Sea ice |
op_relation |
0146-6380 https://dspace.library.uu.nl/handle/1874/387541 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782340192984629248 |