Characteristics of Organic Carbon and Nitrogen in Antarctic Marine Sediments and Their Paleoclimatic Significance:A Case Study on the Amundsen Sea
Chen Dong
Ge Qian
Lei Ziyan
Zhang Yongcong
Han Xibin
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.
Keywords：the Amundsen Seaorganic carbon and nitrogensource of organic matterpaleoclimatethe mid-Holocenemarine geology
Publication Date：2024-08-15
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：13( 2925-2937 )