Past environmental changes in the Sea of Okhotsk during the last 1.5 Ma reconstructed using long-chain diol proxies, supplement to: Lattaud, Julie; Lo, Li; Zeeden, Christian; Liu, Ya-Jun; Song, Sheng-Rong; van der Meer, Marcel T J; Sinninghe Damsté, Jaap S; Schouten, Stefan (2019): A multiproxy study of past environmental changes in the Sea of Okhotsk during the last 1.5 Ma. Organic Geochemistry, 132, 50-61

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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Bibliographic Details
Main Authors: Lattaud, Julie, Lo, Li, Zeeden, Christian, Liu, Ya-Jun, Song, Sheng-Rong, van der Meer, Marcel T J, Schouten, Stefan, Sinninghe Damsté, Jaap S
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA - Data Publisher for Earth & Environmental Science 2018
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Online Access:https://dx.doi.org/10.1594/pangaea.896775
https://doi.pangaea.de/10.1594/PANGAEA.896775
Description
Summary: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 TEXL86) 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 TEXL86, 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.