Rochholz, Fiona Judith

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My PhD is part of the ERC project EARTHSEQUENCING, that focuses on the development of a high- resolution and continuous record of geological events, ages and durations for the past 66 million years. It aims to extract properties of Earth’s and solar system orbital motion. Part of this approach is to seek and understand the climate and carbon cycle sensitivity to orbital forcing throughout the Cenozoic, where deep sea records indicate orbital changes.

Within this framework, I will investigate climate changes in the Paleogene, that are well described by sediment records, such as the Eocene-Oligocene boundary, the Paleocene-Eocene-Thermal-Maximum.
We will quantify and identify the Earth’s system reaction to climate perturbation (greenhouse gas concentration changes, changes in continental configuration,..) under the forcing of orbital parameters. This helps to describe the Earth’s sensitivity and thus determine the dependency of the Earth’s Systems reaction to the environmental conditions (icehouse or greenhouse). We use an Earth System Model of Intermediate Complexity, the cGENIE Earth System Model. For this model, I will develop experiments over long-term amplitude modulation cycles which requires model runs of at least 500 ka – 1 Ma. Based on these runs, I will test the hypothesis, that the Earth’s climate response to orbital forcing has varied depending on the environmental boundary conditions.