A Comparison of Late Quaternary Organic Proxy-Based Paleotemperature Records of the Central Sea of Okhotsk

Julie Lattaud; Li Lo; Jyh Jaan Huang; Yu Min Chou; Sergey A. Gorbarenko; Jaap S. Sinninghe Damsté; Stefan Schouten

doi:10.1029/2018PA003388

A Comparison of Late Quaternary Organic Proxy-Based Paleotemperature Records of the Central Sea of Okhotsk

Julie Lattaud^*, Li Lo, Jyh Jaan Huang, Yu Min Chou, Sergey A. Gorbarenko, Jaap S. Sinninghe Damsté, Stefan Schouten

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

The long-chain diol index (LDI) is a new organic sea surface temperature (SST) proxy based on the distribution of long-chain diols. It has been applied in several environments but not yet in subpolar regions. Here we tested the LDI on surface sediments and a sediment core from the Sea of Okhotsk, which is the southernmost seasonal sea ice-covered region in the Northern Hemisphere, and compared it with other organic temperature proxies, that is, U^k' ₃₇ and TEX^L ₈₆. In the surface sediments, the LDI is correlated with autumn SST, similar to the U^k' ₃₇ but different from the TEX^L ₈₆ that correlates best with summer sea subsurface temperature. Remarkably, the obtained local LDI calibration was significantly different from the global core-top calibration. We used the local LDI calibration to reconstruct past SST changes in the central Sea of Okhotsk. The LDI-SST record shows low glacial (Marine Isotope Stage, MIS 2, 4, and 6) and high interglacial (MIS 1 and MIS 5) temperatures and follows the same pattern as the U^k' ₃₇-SST and a previously published TEX^L ₈₆ temperature record. Similar to the modern situation, the reconstructed temperatures during the interglacials likely reflect different seasons, that is, summer for the TEX^L ₈₆ and autumn for (Formula presented.) and LDI. During glacials, the reconstructed temperatures of all three proxies are similar to each other, likely reflecting summer temperatures as this was the only season free of sea ice. Our results suggest that the LDI is a suitable proxy to reconstruct subpolar seawater temperatures.

Original language	English
Pages (from-to)	732-744
Number of pages	13
Journal	Paleoceanography and Paleoclimatology
Volume	33
Issue number	7
DOIs	https://doi.org/10.1029/2018PA003388
Publication status	Published - 1 Jul 2018

Funding

J. L. Toney and J. Tierney are thanked for their constructive comments, which improved the manuscript. We thank Denise Dorhout, Jort Ossebaar, and Anchelique Mets for technical assistance. This research has been funded by the European Research Council (ERC) under the European Union’s Seventh Framework Program (FP7/2007–2013) ERC grant agreement (339206) to S.S. The work was further supported by funding from the Netherlands Earth System Science Center (NESSC) through a gravitation grant (NWO 024.002.001) from the Dutch Ministry for Education, Culture and Science to J. S. S. D. and S. S. L. L. was supported by grants of the Ministry of Science and Technology (MOST) , Taiwan ROC (10-2119-M-002-003, 104-2917-I-564-046, and 105-2119-M-002-001), National Natural Science Foundation of China (41773116), State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences start-up fund and 135 project (SKLaBIG-QD-16-04 and 135 PY201605). Samples of core MD01-2414 and core-top samples were generously provided by Taiwan Ocean Research Institute (TORI) and S.A. Gorbarenko, respectively. Data are available at Pangaea (doi: 10.1594/PANGAEA.890820).

Keywords

LDI
Sea of Okhotsk
TEX U37k′

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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title = "A Comparison of Late Quaternary Organic Proxy-Based Paleotemperature Records of the Central Sea of Okhotsk",

abstract = "The long-chain diol index (LDI) is a new organic sea surface temperature (SST) proxy based on the distribution of long-chain diols. It has been applied in several environments but not yet in subpolar regions. Here we tested the LDI on surface sediments and a sediment core from the Sea of Okhotsk, which is the southernmost seasonal sea ice-covered region in the Northern Hemisphere, and compared it with other organic temperature proxies, that is, Uk' 37 and TEXL 86. In the surface sediments, the LDI is correlated with autumn SST, similar to the Uk' 37 but different from the TEXL 86 that correlates best with summer sea subsurface temperature. Remarkably, the obtained local LDI calibration was significantly different from the global core-top calibration. We used the local LDI calibration to reconstruct past SST changes in the central Sea of Okhotsk. The LDI-SST record shows low glacial (Marine Isotope Stage, MIS 2, 4, and 6) and high interglacial (MIS 1 and MIS 5) temperatures and follows the same pattern as the Uk' 37-SST and a previously published TEXL 86 temperature record. Similar to the modern situation, the reconstructed temperatures during the interglacials likely reflect different seasons, that is, summer for the TEXL 86 and autumn for (Formula presented.) and LDI. During glacials, the reconstructed temperatures of all three proxies are similar to each other, likely reflecting summer temperatures as this was the only season free of sea ice. Our results suggest that the LDI is a suitable proxy to reconstruct subpolar seawater temperatures.",

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AU - Sinninghe Damsté, Jaap S.

AU - Schouten, Stefan

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A Comparison of Late Quaternary Organic Proxy-Based Paleotemperature Records of the Central Sea of Okhotsk

Abstract

Funding

Keywords

UN SDGs

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