Carbon isotope stratigraphy can be tricky to get your head around (trust me i know!). So I've put a short video together explaining a way of explaining the way you can interpret their graphs.
References for figures in order of their appearance:
1. Lorentz, K., 2007. NASA - Humans and the Global Carbon Cycle: A Faustian Bargain?. (online) Nasa.gov. Available at: [ Ссылка ] (Accessed 23 November 2021).
2. Cramer, B. and Jarvis, I., 2020. Carbon Isotope Stratigraphy. Geologic Time Scale 2020, 1, pp.309-343.
3. IUCN, Global Marine and Polar Programme, 2019. Ocean Deoxygenation: Everyone's Problem. p.343 and 352. [ Ссылка ]
4. Oceanservice.noaa.gov. 2021. What is upwelling?. (online) Available at: [ Ссылка ] (Accessed 23 November 2021).
5. Trudinger, C., Enting, I., Francey, R., Etheridge, D. and Rayner, P., 1999. Long-term variability in the global carbon cycle inferred from a high-precision CO2 and δ13C ice-core record. Tellus B: Chemical and Physical Meteorology, 51(2), pp.233-248.
Referring to data from (a) Etheridge, D., Steele, L., Langenfelds, R., Francey, R., Barnola, J. and Morgan, V., 1996. Natural and anthropogenic changes in atmospheric CO2over the last 1000 years from air in Antarctic ice and firn. Journal of Geophysical Research: Atmospheres, 101(D2), pp.4115-4128.
And (b) Francey, R., Allison, C., Etheridge, D., Trudinger, C., Enting, I., Leuenberger, M., Langenfelds, R., Michel, E. and Steele, L., 1999. A 1000-year high precision record of δ13C in atmospheric CO2. Tellus B: Chemical and Physical Meteorology, 51(2), pp.170-193.
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