http://scholars.ntou.edu.tw/handle/123456789/9151
標題: | Palaeoceanography changes in the Okhotsk Sea during Late Pleistocene and Holocene according to diatoms | 作者: | Artemova, Antonina Gorbarenko, Sergey Vasilenko, Yuriy Shi, Xuefa Liu, Yanguang Chen, Min-Te |
關鍵字: | GLOBAL CLIMATE CHANGES;SURFACE SEDIMENTS;PACIFIC-OCEAN;KYR;ENVIRONMENT;RECORDS | 公開日期: | 30-十一月-2017 | 出版社: | PERGAMON-ELSEVIER SCIENCE LTD | 卷: | 459 | 起(迄)頁: | 175-186 | 來源出版物: | QUATERN INT | 摘要: | 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. (c) 2017 The Authors. Published by Elsevier Ltd. |
URI: | http://scholars.ntou.edu.tw/handle/123456789/9151 | ISSN: | 1040-6182 | DOI: | 10.1016/j.quaint.2017.10.002 |
顯示於: | 地球科學研究所 13 CLIMATE ACTION 15 LIFE ON LAND |
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