Jiang, Zhiyi;
(2024)
Atlantic Meridional Overturning Circulation in equilibrium and transient simulations of the past two interglacials.
Doctoral thesis (Ph.D), UCL (University College London).
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Abstract
The Atlantic Meridional Overturning Circulation (AMOC) transports heat northward and modulates climate. AMOC change is one of the potential causes for abrupt events in the past, and could contribute to future climate change. How the AMOC responded to changes in forcing experienced during past warm climates is an intriguing and open question. This thesis focuses on investigating AMOC changes in both equilibrium and transient simulations in the Holocene and last interglacial. No changes in AMOC are unambiguously driven by orbital forcing changes directly. There also appears little impact of changes in greenhouse gases, volcanic and solar forcings during the Holocene. Internal variability can explain most of the changes seen in simulations. These conclusions remain robust whether considering the overall AMOC strength or its spatial patterns. The results from these ensembles are not inconsistent with existing proxy records. Including further simulations would increase the confidence of these conclusions especially when looking at spatial patterns and different AMOC components given their model dependence. Further analysis suggests overall AMOC strength does not play a globally important role in explaining surface temperature changes in the midHolocene and lig127k, and hydrology-related proxy reconstructions should be used with caution when interpreting them as related to AMOC changes.
| Type: | Thesis (Doctoral) |
|---|---|
| Qualification: | Ph.D |
| Title: | Atlantic Meridional Overturning Circulation in equilibrium and transient simulations of the past two interglacials |
| Open access status: | An open access version is available from UCL Discovery |
| Language: | English |
| Additional information: | Copyright © The Author 2024. Original content in this thesis is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) Licence (https://creativecommons.org/licenses/by-nc/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL SLASH UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS > Dept of Geography |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10188516 |
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