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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50188

Title: Palaeoceanography changes in the Okhotsk Sea during Late Pleistocene and Holocene according to diatoms
Authors: Antonina Artemova
Sergey Gorbarenko
Yuriy Vasilenko
Xuefa Shi
Yanguang Liu
Min-Te Chend.
Contributors: 國立臺灣海洋大學:應用地球科學研究所
Keywords: Diatom assemblages
Okhotsk Sea
Environment
Holocene
Late Pleistocene
Date: 2017-10
Issue Date: 2018-09-20T01:50:55Z
Publisher: Quaternary International
Abstract: Abstract: Paleontological records of six sediment cores in the Okhotsk Sea (OS) marked the regional environmental changes over the last 140 kyr on orbital time scales. The diatom assemblages and content of diatom frustules in the sediments during Marine Isotope Stage (MIS) 6–1 indicate the dramatic climatic and environmental changes in the OS. A small abundance and low diatom species diversity as well as the high percentage of near-ice species indicate the cold surface environmental condition during glacial time (MIS 6, 4, 2) with low temperatures, cold climate conditions and extended sea ice cover. The presence of extinct redeposited species in the glacial assemblages indicates a low sea level during this time. The proportion of ice species enlarged and diatom abundance reduced due to increase of the influence of the sea ice, reflecting the sharp climatic cooling of adjacent land and regional environmental deterioration.

The subsequent increase in diatoms productivity at 129.8–117.0 kyr BP and 8.3–5.5 kyr BP indicates the strong climate warming accompanied by decrease of sea ice coverage and surface water stratification (mixing of surface and intermediate water) during the warmest MIS in the Okhotsk Sea. The diatom abundance and high content of the oceanic and warm-water species reflect the warm surface environmental condition during MIS 5e and 1 since 8.3 kyr due to decrease of the sea ice influence.
Relation: 459 pp.175-186
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50188
Appears in Collections:[應用地球科學研究所] 期刊論文

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