Global climate and Indonesian Throughflow during the Middle Miocene Climate Transition : a modeling approach
The current study focuses on the Middle Miocene Climate Transition (MMCT), a main global cooling step during the Cenozoic (66-0 Ma). This transition, likely triggered by changes in the Earth's orbital configuration and a decrease in atmospheric CO2 concentration, entailed major expansion of the...
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ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/1665 2023-05-15T13:41:01+02:00 Global climate and Indonesian Throughflow during the Middle Miocene Climate Transition : a modeling approach Globales Klima und indonesicher Durchstrom während des Klimaumschwunges im mittleren Miozän : ein Modellierungsansatz Frigola, Amanda Schulz, Michael Prange, Matthias Feulner, Georg 2019-07-10 application/pdf https://media.suub.uni-bremen.de/handle/elib/1665 https://nbn-resolving.org/urn:nbn:de:gbv:46-00107656-15 eng eng Universität Bremen FB5 Geowissenschaften https://media.suub.uni-bremen.de/handle/elib/1665 urn:nbn:de:gbv:46-00107656-15 info:eu-repo/semantics/openAccess Middle Miocene Climate Transition GCM boundary conditions ocean cooling ocean circulation CO2 Antarctic ice sheet deep water formation MOC Indonesian Throughflow 500 500 Science ddc:500 Dissertation doctoralThesis 2019 ftsubbremen 2022-11-09T07:09:39Z The current study focuses on the Middle Miocene Climate Transition (MMCT), a main global cooling step during the Cenozoic (66-0 Ma). This transition, likely triggered by changes in the Earth's orbital configuration and a decrease in atmospheric CO2 concentration, entailed major expansion of the Antarctic ice sheet, cooling of the surface and deep ocean, and global eustatic sea level fall during the interval 15-13 Ma. A central aim of this study is to assess, by means of the global coupled model Community Climate System Model version 3 (CCSM3), the ocean response to atmospheric CO2 dropdown and Antarctic ice sheet expansion during the MMCT. In particular, it is investigated whether the combined effects of the CO2 decrease and Antarctic ice sheet expansion could explain the cooling of surface and deep waters across the MMCT inferred from proxy data, the separate effects of these two forcings on surface and deep water temperatures, and the mechanisms these forcings were triggering that explain their modeled effects on ocean temperatures. Ocean gateways are relatively narrow channels of water separating two main ocean basins. Changes in the bathymetry of ocean gateways alter the water properties of the basins they connect and this can have regional to global scale climate effects. An example of ocean gateway is the Indonesian gateway, the tropical passage connecting the Pacific and Indian oceans, which has a significant influence on the climatic states of those oceans. The origin of the West Pacific Warm Pool, for example, the most extensive warm surface water mass on Earth, has been suggested to be linked to narrowing of the Indonesian gateway. A further aim of this study is that of modeling the characteristics of the Indonesian Throughflow during the MMCT by means of CCSM3, providing estimates of volume transport, analyzing the vertical structure of the waterflow, the direction of waterpaths, the relative contributions of North and South Pacific water to the Indonesian Throughflow, the control mechanisms of its ... Doctoral or Postdoctoral Thesis Antarc* Antarctic Ice Sheet Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) Antarctic Gateway The ENVELOPE(170.967,170.967,-83.517,-83.517) Indian Pacific The Antarctic |
institution |
Open Polar |
collection |
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
op_collection_id |
ftsubbremen |
language |
English |
topic |
Middle Miocene Climate Transition GCM boundary conditions ocean cooling ocean circulation CO2 Antarctic ice sheet deep water formation MOC Indonesian Throughflow 500 500 Science ddc:500 |
spellingShingle |
Middle Miocene Climate Transition GCM boundary conditions ocean cooling ocean circulation CO2 Antarctic ice sheet deep water formation MOC Indonesian Throughflow 500 500 Science ddc:500 Frigola, Amanda Global climate and Indonesian Throughflow during the Middle Miocene Climate Transition : a modeling approach |
topic_facet |
Middle Miocene Climate Transition GCM boundary conditions ocean cooling ocean circulation CO2 Antarctic ice sheet deep water formation MOC Indonesian Throughflow 500 500 Science ddc:500 |
description |
The current study focuses on the Middle Miocene Climate Transition (MMCT), a main global cooling step during the Cenozoic (66-0 Ma). This transition, likely triggered by changes in the Earth's orbital configuration and a decrease in atmospheric CO2 concentration, entailed major expansion of the Antarctic ice sheet, cooling of the surface and deep ocean, and global eustatic sea level fall during the interval 15-13 Ma. A central aim of this study is to assess, by means of the global coupled model Community Climate System Model version 3 (CCSM3), the ocean response to atmospheric CO2 dropdown and Antarctic ice sheet expansion during the MMCT. In particular, it is investigated whether the combined effects of the CO2 decrease and Antarctic ice sheet expansion could explain the cooling of surface and deep waters across the MMCT inferred from proxy data, the separate effects of these two forcings on surface and deep water temperatures, and the mechanisms these forcings were triggering that explain their modeled effects on ocean temperatures. Ocean gateways are relatively narrow channels of water separating two main ocean basins. Changes in the bathymetry of ocean gateways alter the water properties of the basins they connect and this can have regional to global scale climate effects. An example of ocean gateway is the Indonesian gateway, the tropical passage connecting the Pacific and Indian oceans, which has a significant influence on the climatic states of those oceans. The origin of the West Pacific Warm Pool, for example, the most extensive warm surface water mass on Earth, has been suggested to be linked to narrowing of the Indonesian gateway. A further aim of this study is that of modeling the characteristics of the Indonesian Throughflow during the MMCT by means of CCSM3, providing estimates of volume transport, analyzing the vertical structure of the waterflow, the direction of waterpaths, the relative contributions of North and South Pacific water to the Indonesian Throughflow, the control mechanisms of its ... |
author2 |
Schulz, Michael Prange, Matthias Feulner, Georg |
format |
Doctoral or Postdoctoral Thesis |
author |
Frigola, Amanda |
author_facet |
Frigola, Amanda |
author_sort |
Frigola, Amanda |
title |
Global climate and Indonesian Throughflow during the Middle Miocene Climate Transition : a modeling approach |
title_short |
Global climate and Indonesian Throughflow during the Middle Miocene Climate Transition : a modeling approach |
title_full |
Global climate and Indonesian Throughflow during the Middle Miocene Climate Transition : a modeling approach |
title_fullStr |
Global climate and Indonesian Throughflow during the Middle Miocene Climate Transition : a modeling approach |
title_full_unstemmed |
Global climate and Indonesian Throughflow during the Middle Miocene Climate Transition : a modeling approach |
title_sort |
global climate and indonesian throughflow during the middle miocene climate transition : a modeling approach |
publisher |
Universität Bremen |
publishDate |
2019 |
url |
https://media.suub.uni-bremen.de/handle/elib/1665 https://nbn-resolving.org/urn:nbn:de:gbv:46-00107656-15 |
long_lat |
ENVELOPE(170.967,170.967,-83.517,-83.517) |
geographic |
Antarctic Gateway The Indian Pacific The Antarctic |
geographic_facet |
Antarctic Gateway The Indian Pacific The Antarctic |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_relation |
https://media.suub.uni-bremen.de/handle/elib/1665 urn:nbn:de:gbv:46-00107656-15 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766144563969261568 |