https://scholars.lib.ntu.edu.tw/handle/123456789/440444
標題: | A Comparison of Late Quaternary Organic Proxy-Based Paleotemperature Records of the Central Sea of Okhotsk | 作者: | Lattaud, J. Lo, L. Huang, J.-J. Chou, Y.-M. Gorbarenko, S.A. Sinninghe Damst?, J.S. Schouten, S. LI LO |
關鍵字: | LDI; Sea of Okhotsk; TEX86 U37k′ | 公開日期: | 2018 | 卷: | 33 | 期: | 7 | 起(迄)頁: | 732-744 | 來源出版物: | Paleoceanography and Paleoclimatology | 摘要: | 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. ©2018. The Authors. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85050944594&doi=10.1029%2f2018PA003388&partnerID=40&md5=534d0eeea4c34ee7b68a78515b3585cd https://scholars.lib.ntu.edu.tw/handle/123456789/440444 |
DOI: | 10.1029/2018PA003388 | SDG/關鍵字: | calibration; comparative study; glacial-interglacial cycle; marine isotope stage; Northern Hemisphere; paleotemperature; proxy climate record; Quaternary; sediment core; surficial sediment; Pacific Ocean; Sea of Okhotsk |
顯示於: | 地質科學系 |
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