极地研究2023，Vol.35Issue(4)：542-555,14.DOI:10.13679/j.jdyj.20220437
末次冰期内威德尔海的冰筏碎屑增多事件与底流增强事件的耦合性
Coupling between iceberg rafted debris events and bottom current activities in the northwestern Weddell Sea during the last glacial period
摘要
Abstract
During the late Quaternary,climate changes drove the advance and retreat of ice shelves in and around the Antarctic.Icebergs carried iceberg rafted debris(IRD)by calving,floating,and melting into the ocean.The large amount of melt water altered the structure of ocean water profiles and activities,which also af-fected the deposition of IRD.The association between IRD events and bottom current activities is not yet fully understood.Here,we present a sediment record retrieved from the northwestern Weddell Sea.Obvious peaks of four-IRD events were observed parallel with four bottom water enhancement events,based on a precise comparison of grain size data and End Member Model Analysis.These synchronous events revealed a coupling mechanism between the ocean and glacial systems.Two strong washing events supported the ex-istence of two discontinuities of sedimentation,which explained the age difference between the paleomag-netism reverse and the AMS14C data.As the very low export productivity was similar to that at a glacial level,we deduced that most of this core was deposited in the last glacial period.The millennial temperature increases in the Antarctic triggered ice shelf retreats and led to obvious IRD events and bottom current ac-tivities.关键词
粒度/冰筏碎屑/生产力/沉积物/威德尔海Key words
grain size/ice rafted debris/productivity/sediment/Weddell Sea引用本文复制引用
颜彬,谢敬谦,武力,黄博..末次冰期内威德尔海的冰筏碎屑增多事件与底流增强事件的耦合性[J].极地研究,2023,35(4):542-555,14.基金项目
国家自然科学基金面上基金(42276077)、海洋地质国家重点实验室开放基金(MGK202207)和国家海洋局南海分局海洋科学技术局长基金重点项目(180107)资助 （42276077）
