Orbital variability

Orbital parameters (obliquity, precession, eccentricity) describe the position of the Earth relative to the sun and the shape of Earth orbit. Combination of those parameters control the amount and seasonal distribution of solar energy received at the surface of the Earth and varies in time. This axis aims at better understanding how orbital variations control contributes to patterns retreived in the sedimentary record. To do so we use Earth system model simulations that include marine biogeochemistry.

Projects:
- Pleistocene Indo-Pacific Warm Pool.
- Anoxia in Late Cretaceous Atlantic Ocean.
- Indian ocean & monsoon variability.

Relevant publications

-Beaufort, L., * Sarr, A-C., (* corresponding authors). Eccentricity forcing on Tropical Ocean Seasonality, in press at Climate of the Past

-Sarr, A-C., Donnadieu, Y., Laugié, M., Ladant, J.-B., Suchéras-Marx, B., Raisson, F. Ventilation changes drive orbital-scale deoxygenation trends in the late Cretaceous ocean, Geophysical Research Letters, 49(19):e2022GL099830 (2022).

-Bolton, C.T., Gray, E., Kuhnt, W., Holbourn, A., Lübbers, J., Grant, K., Tachikawa, K., Marino, G., Rohling, E.J., Sarr, A-C., Andersen, N. Secular and orbital-scale variability of equatorial Indian Ocean summer monsoon winds during the late Miocene. Climate of the Past, 18:713–738 (2022).

-Beaufort, L., Bolton, C., Sarr A-C., Sucheras-Marx, B., Rosenthal, Y., Donnadieu, Y., Barbarin, N., Bova, S., Cornuault, P., Gally, Y., Gray, E., Mazur, J-C., and Tetard, M. Cyclic evolution of phytoplankton forced by tropical seasonality, Nature, 601:79-84 (2022).