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Time-series analysis of ocean biogeochemical and ecological data
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Neogene burial of organic carbon in the global ocean (Invited)
Tuesday 8th @ 1405-1440, Conference Room 5
Yige Zhang* , Department of Oceanography, Texas A&M University, College Station, TX 77843, USA
Ziye Li, Department of Oceanography, Texas A&M University, College Station, TX 77843, USA; College of Marine Geosciences, Ocean University of China, Qingdao, 266100;
Presenter Email: yige.zhang@tamu.edu |
| The burial of organic carbon (OC) in marine sediments is a process that controls the organic sub-cycle of the global carbon cycle. Buried OC is effectively isolated from the Earth’s surficial system therefore serve as a net sink for atmospheric CO2, and a source for O2, and contributes to the formation of organic-rich sources rocks essential for petroleum or natural gas. The global rate of OC burial is conventionally calculated using the mass balance between inorganic carbon and OC, each with distinct isotopic values (δ13C). However, the uncertainty associated with some key parameters complicates this approach. The history and imperative controls of OC burial are being debated. Here we used a “bottom-up” approach independent from model calculations, to utilize the total organic carbon (TOC%) reported from numerous sites drilled by the International Ocean Discovery Program (IODP). Although TOC% measurement is an IODP standard practice, these data are rarely explored in-depth or synthesized. We targeted > 80 sites covering all major ocean basins and sedimentary environments, to quality-control the data, update their age models, and establish regional and global pictures of TOC mass accumulation rates over the Neogene (23.0-2.6 Ma). This study helps shed light on some fundamental questions such as the spatio- temporal variability of OC burial. We show that over the Neogene, regional and global changes of OC burial rates were substantial which largely impacted the carbon and oxygen cycle as well as the occurrence of organic-rich sediments/rocks. For the special tutorial session of XMAS IV, I will explicitly demonstrate the acquiring and processing of the physical and chemical property data of IODP sediments, as well as the chronology controls. |
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