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    Volume 49 Issue 8
    Aug.  2024
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    Article Navigation >  Earth Science  > 2024  >  49(8): 2925-2937
    Chen Dong, Ge Qian, Lei Ziyan, Zhang Yongcong, Han Xibin, 2024. Characteristics of Organic Carbon and Nitrogen in Antarctic Marine Sediments and Their Paleoclimatic Significance: A Case Study on the Amundsen Sea. Earth Science, 49(8): 2925-2937. doi: 10.3799/dqkx.2023.070
    Citation: Chen Dong, Ge Qian, Lei Ziyan, Zhang Yongcong, Han Xibin, 2024. Characteristics of Organic Carbon and Nitrogen in Antarctic Marine Sediments and Their Paleoclimatic Significance: A Case Study on the Amundsen Sea. Earth Science, 49(8): 2925-2937. doi: 10.3799/dqkx.2023.070
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    Characteristics of Organic Carbon and Nitrogen in Antarctic Marine Sediments and Their Paleoclimatic Significance: A Case Study on the Amundsen Sea

    doi: 10.3799/dqkx.2023.070

    • Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China

    • Received Date: 2023-03-01
      Available Online: 2024-08-27
    • Publish Date: 2024-08-25
      Abstract
    • To better understand the current evolution of the Antarctic ice sheet and climate, as well as to provide a basis fo future predictions of ice sheet and climate change, the organic carbon and nitrogen contents and stable isotope values of sediments from Hole A11-02 were analyzed, combined with the characteristics of grain size and geochemical elements, to explore the origin and paleoclimatic significance of organic matter in sediments from the Amundsen Sea, West Antarctic since the mid-Holocene. The δ13Corg value of the sediments indicates that the organic matter is mainly input from marine, and the contribution of terrestrial organic matter is relatively small. By analyzing the changes of sediment total organic carbon content and sea source organic matter content, combined with the variation characteristics of grain size and elements, it is believed that the change of paleoproductivity in the study area since the mid-Holocene is mainly related to climate change, and then it is identified that there are four cold stages at 4 750-4 500 a BP, 3 600-3 400 a BP, 2 250-2 000 a BP and 600-400 a BP.

       

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