Coccolith morphological parameters, coccolith flux, and coccolith mass accumulation rate at ODP Site 1143 in the South China Sea over the past 2 Myr- A Big Earth Data Platform for Three Poles

The marine calcifying algae coccolithophores are one of the major contributors to the marine carbonate counter pump. The long-term change in coccolith size/mass that imprints the degree of coccolith calcification could have exerted impacts on the past carbon cycle and climate changes in the geological times. Here, we investigated coccolith morphological parameters, coccolith flux, and coccolith mass accumulation rate at Ocean Drilling Program (ODP) Site 1143 (113.285° E, 9.362° N, 2,772 m water depth) in the South China Sea over the past 2 Myr. The coccolith morphological parameters are measured in the coccolith slides, including the data of coccolith length, coccolith area, and coccolith thickness. Coccolith thickness is calibrated by its brightness under a circular polarized microscope. Coccolith mass then can be calculated from coccolith area, thickness and calcite density. The coccolith flux data that reflect the coccolithophore productivity are determined by an absolute coccolith counting method in the coccolith slides. Thereafter, coccolith mass accumulation rate can be resolved by coccolith flux and coccolith mass.

Our coccolith data confirm the idea that Earth eccentricity controlled coccolith size diversity and calcite export production in tropical oceans in the Pleistocene. In addition, we consider a possible origin of the long-term increase in coccolith size as a result of increased oceanic alkalinity availability. As coccolithophores evolved simultaneously in global oceans, the increased coccolith calcification may have promoted global marine particulate inorganic carbon production, especially for the interglacial stages. Therefore, the enhanced coccolith-based CCP may account for a stepwise increase in interglacial CO2 levels over the middle Pleistocene. High CO2 levels at the onset of the interglacial stages may reduce the glaciation rate, thereby prolonging an entire interglacial-glacial cycle after the middle Pleistocene.

File naming and required software

The coccolith data are stored in Microsoft XLSX format, the name of the file is “ODP Site 1143 coccolith data (NTPDC).xlsx”. In the XLSX sheet, column A represents the meters of composited depth below seafloor at ODP Site 1143; column A represents the age (ka) of this site; columns C-D represent average coccolith length (μm) and the standard deviation; columns E-F represent average coccolith thickness (μm) and the standard deviation; columns G-H represent average coccolith area (μm^2) and the standard deviation; columns I-J represent average coccolith mass (pg) and the standard deviation; columns K-M represent the lower and upper quartile and the interquartile range of coccolith mass; columns N-P represent the coccolith morphological divergent index with cutoff values of 2.5, 2.75, and 3 μm; columns Q-R represent coccolith abundance (10^6/g) and the 1.96×standard error; columns S-T represent coccolith flux (10^6/cm^2/kyr) and the 1.96×standard error; columns U-V represent coccolith mass accumulation rate (g calcite/m^2/year) and the 1.96×standard error.

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Jin, X. (2022). Coccolith morphological parameters, coccolith flux, and coccolith mass accumulation rate at ODP Site 1143 in the South China Sea over the past 2 Myr. A Big Earth Data Platform for Three Poles, DOI: 10.11888/Paleoenv.tpdc.272701. CSTR: 18406.11.Paleoenv.tpdc.272701. (Download the reference： RIS | Bibtex )

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