期刊
SCIENCE ADVANCES
卷 7, 期 28, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abf9489
关键词
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资金
- National Natural Science Foundation of China [41888101, 41790450, 41972096]
- National Key RD Plan [2019YFC0605405]
- China Geological Survey project [DD20190010]
- Key Scientific and Technological Project of RIPED [2021ycq01]
- 111 project [B20011]
- UC Berkeley Miller Institute for Basic Research
- UC President's Postdoctoral Fellowships
The study demonstrates a cyclical pattern of approximately 173 thousand years in organic carbon burial processes in middle to high latitudes. This signal is amplified by internal climate feedbacks of the carbon cycle under different geographic and climate conditions, controlling a series of sensitive climatic processes. The presence of the obliquity amplitude modulation (AM) cycle during the Mesozoic and Cenozoic is confirmed by new and compiled records from multiple proxies.
Earth's climate system is complex and inherently nonlinear, which can induce some extraneous cycles in paleoclimatic proxies at orbital time scales. The paleoenvironmental consequences of these extraneous cycles are debated owing to their complex origin. Here, we compile high-resolution datasets of total organic carbon (TOC) and stable carbon isotope (delta C-13(org)) datasets to investigate organic carbon burial processes in middle to high latitudes. Our results document a robust cyclicity of similar to 173 thousand years (ka) in both TOC and delta C-13(org). The similar to 173-ka obliquity-related forcing signal was amplified by internal climate feedbacks of the carbon cycle under different geographic and climate conditions, which control a series of sensitive climatic processes. In addition, our new and compiled records from multiple proxies confirm the presence of the obliquity amplitude modulation (AM) cycle during the Mesozoic and Cenozoic and indicate the usefulness of the similar to 173-ka cycle as geochronometer and for paleoclimatic interpretation.
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