Eocene to Oligocene vegetation and climate in the Tasmanian Gateway region were controlled by changes in ocean currents and pCO2
Considered one of the most significant climate reorganizations of the Cenozoic period, the Eocene–Oligocene Transition (EOT; ca. 34.44–33.65) is characterized by global cooling and the first major glacial advance on Antarctica. In the southern high latitudes, the EOT cooling is primarily recorded in...
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European Geosciences Union
2022
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Online Access: | https://nrl.northumbria.ac.uk/id/eprint/48760/ https://doi.org/10.5194/cp-18-525-2022 https://nrl.northumbria.ac.uk/id/eprint/48760/1/cp-18-525-2022.pdf |
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ftunivnorthumb:oai:nrl.northumbria.ac.uk:48760 2023-05-15T13:44:52+02:00 Eocene to Oligocene vegetation and climate in the Tasmanian Gateway region were controlled by changes in ocean currents and pCO2 Amoo, Michael Salzmann, Ulrich Pound, Matthew Thompson, Alasdair Bijl, Peter K. 2022-03-22 text https://nrl.northumbria.ac.uk/id/eprint/48760/ https://doi.org/10.5194/cp-18-525-2022 https://nrl.northumbria.ac.uk/id/eprint/48760/1/cp-18-525-2022.pdf en eng European Geosciences Union https://nrl.northumbria.ac.uk/id/eprint/48760/1/cp-18-525-2022.pdf Amoo, Michael, Salzmann, Ulrich, Pound, Matthew, Thompson, Alasdair and Bijl, Peter K. (2022) Eocene to Oligocene vegetation and climate in the Tasmanian Gateway region were controlled by changes in ocean currents and pCO2. Climate of the Past, 18 (3). pp. 525-546. ISSN 1814-9332 cc_by_4_0 CC-BY F700 Ocean Sciences F800 Physical and Terrestrial Geographical and Environmental Sciences Article PeerReviewed 2022 ftunivnorthumb https://doi.org/10.5194/cp-18-525-2022 2022-09-25T06:15:22Z Considered one of the most significant climate reorganizations of the Cenozoic period, the Eocene–Oligocene Transition (EOT; ca. 34.44–33.65) is characterized by global cooling and the first major glacial advance on Antarctica. In the southern high latitudes, the EOT cooling is primarily recorded in the marine realm, and its extent and effect on the terrestrial climate and vegetation are poorly documented. Here, we present new, well-dated, continuous, high-resolution palynological (sporomorph) data and quantitative sporomorph-based climate estimates recovered from the East Tasman Plateau (ODP Site 1172) to reconstruct climate and vegetation dynamics from the late Eocene (37.97 Ma) to the early Oligocene (33.06 Ma). Our results indicate three major climate transitions and four vegetation communities occupying Tasmania under different precipitation and temperature regimes: (i) a warm-temperate Nothofagus–Podocarpaceae-dominated rainforest with paratropical elements from 37.97 to 37.52 Ma; (ii) a cool-temperate Nothofagus-dominated rainforest with secondary Podocarpaceae rapidly expanding and taking over regions previously occupied by the warmer taxa between 37.306 and 35.60 Ma; (iii) fluctuation between warm-temperate–paratropical taxa and cool temperate forest from 35.50 to 34.49 Ma, followed by a cool phase across the EOT (34.30–33.82 Ma); and (iv) a post-EOT (earliest Oligocene) recovery characterized by a warm-temperate forest association from 33.55 to 33.06 Ma. Coincident with changes in the stratification of water masses and sequestration of carbon from surface water in the Southern Ocean, our sporomorph-based temperature estimates between 37.52 and 35.60 Ma (phase ii) showed 2–3 ∘C terrestrial cooling. The unusual fluctuation between warm and cold temperate forest between 35.50 to 34.59 Ma is suggested to be linked to the initial deepening of the Tasmanian Gateway, allowing eastern Tasmania to come under the influence of warm water associated with the proto-Leeuwin Current (PLC). Further to the above, our ... Article in Journal/Newspaper Antarc* Antarctica Southern Ocean Northumbria University, Newcastle: Northumbria Research Link (NRL) Southern Ocean Climate of the Past 18 3 525 546 |
institution |
Open Polar |
collection |
Northumbria University, Newcastle: Northumbria Research Link (NRL) |
op_collection_id |
ftunivnorthumb |
language |
English |
topic |
F700 Ocean Sciences F800 Physical and Terrestrial Geographical and Environmental Sciences |
spellingShingle |
F700 Ocean Sciences F800 Physical and Terrestrial Geographical and Environmental Sciences Amoo, Michael Salzmann, Ulrich Pound, Matthew Thompson, Alasdair Bijl, Peter K. Eocene to Oligocene vegetation and climate in the Tasmanian Gateway region were controlled by changes in ocean currents and pCO2 |
topic_facet |
F700 Ocean Sciences F800 Physical and Terrestrial Geographical and Environmental Sciences |
description |
Considered one of the most significant climate reorganizations of the Cenozoic period, the Eocene–Oligocene Transition (EOT; ca. 34.44–33.65) is characterized by global cooling and the first major glacial advance on Antarctica. In the southern high latitudes, the EOT cooling is primarily recorded in the marine realm, and its extent and effect on the terrestrial climate and vegetation are poorly documented. Here, we present new, well-dated, continuous, high-resolution palynological (sporomorph) data and quantitative sporomorph-based climate estimates recovered from the East Tasman Plateau (ODP Site 1172) to reconstruct climate and vegetation dynamics from the late Eocene (37.97 Ma) to the early Oligocene (33.06 Ma). Our results indicate three major climate transitions and four vegetation communities occupying Tasmania under different precipitation and temperature regimes: (i) a warm-temperate Nothofagus–Podocarpaceae-dominated rainforest with paratropical elements from 37.97 to 37.52 Ma; (ii) a cool-temperate Nothofagus-dominated rainforest with secondary Podocarpaceae rapidly expanding and taking over regions previously occupied by the warmer taxa between 37.306 and 35.60 Ma; (iii) fluctuation between warm-temperate–paratropical taxa and cool temperate forest from 35.50 to 34.49 Ma, followed by a cool phase across the EOT (34.30–33.82 Ma); and (iv) a post-EOT (earliest Oligocene) recovery characterized by a warm-temperate forest association from 33.55 to 33.06 Ma. Coincident with changes in the stratification of water masses and sequestration of carbon from surface water in the Southern Ocean, our sporomorph-based temperature estimates between 37.52 and 35.60 Ma (phase ii) showed 2–3 ∘C terrestrial cooling. The unusual fluctuation between warm and cold temperate forest between 35.50 to 34.59 Ma is suggested to be linked to the initial deepening of the Tasmanian Gateway, allowing eastern Tasmania to come under the influence of warm water associated with the proto-Leeuwin Current (PLC). Further to the above, our ... |
format |
Article in Journal/Newspaper |
author |
Amoo, Michael Salzmann, Ulrich Pound, Matthew Thompson, Alasdair Bijl, Peter K. |
author_facet |
Amoo, Michael Salzmann, Ulrich Pound, Matthew Thompson, Alasdair Bijl, Peter K. |
author_sort |
Amoo, Michael |
title |
Eocene to Oligocene vegetation and climate in the Tasmanian Gateway region were controlled by changes in ocean currents and pCO2 |
title_short |
Eocene to Oligocene vegetation and climate in the Tasmanian Gateway region were controlled by changes in ocean currents and pCO2 |
title_full |
Eocene to Oligocene vegetation and climate in the Tasmanian Gateway region were controlled by changes in ocean currents and pCO2 |
title_fullStr |
Eocene to Oligocene vegetation and climate in the Tasmanian Gateway region were controlled by changes in ocean currents and pCO2 |
title_full_unstemmed |
Eocene to Oligocene vegetation and climate in the Tasmanian Gateway region were controlled by changes in ocean currents and pCO2 |
title_sort |
eocene to oligocene vegetation and climate in the tasmanian gateway region were controlled by changes in ocean currents and pco2 |
publisher |
European Geosciences Union |
publishDate |
2022 |
url |
https://nrl.northumbria.ac.uk/id/eprint/48760/ https://doi.org/10.5194/cp-18-525-2022 https://nrl.northumbria.ac.uk/id/eprint/48760/1/cp-18-525-2022.pdf |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Antarc* Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctica Southern Ocean |
op_relation |
https://nrl.northumbria.ac.uk/id/eprint/48760/1/cp-18-525-2022.pdf Amoo, Michael, Salzmann, Ulrich, Pound, Matthew, Thompson, Alasdair and Bijl, Peter K. (2022) Eocene to Oligocene vegetation and climate in the Tasmanian Gateway region were controlled by changes in ocean currents and pCO2. Climate of the Past, 18 (3). pp. 525-546. ISSN 1814-9332 |
op_rights |
cc_by_4_0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/cp-18-525-2022 |
container_title |
Climate of the Past |
container_volume |
18 |
container_issue |
3 |
container_start_page |
525 |
op_container_end_page |
546 |
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1766207945044918272 |