Plio-Pleistocene Perth Basin water temperatures and Leeuwin Current dynamics (Indian Ocean) derived from oxygen and clumped-isotope paleothermometry
The Pliocene sedimentary record provides a window into Earth's climate dynamics under warmer-than-present boundary conditions. However, the Pliocene cannot be considered a stable warm climate that constitutes a solid baseline for middle-of-the-road future climate projections. The increasing ava...
Published in: | Climate of the Past |
---|---|
Main Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2022
|
Subjects: | |
Online Access: | https://doi.org/10.5194/cp-18-1231-2022 https://doaj.org/article/e97c4972ebdf4acd899c96a224fb24c2 |
id |
ftdoajarticles:oai:doaj.org/article:e97c4972ebdf4acd899c96a224fb24c2 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:e97c4972ebdf4acd899c96a224fb24c2 2023-05-15T18:01:09+02:00 Plio-Pleistocene Perth Basin water temperatures and Leeuwin Current dynamics (Indian Ocean) derived from oxygen and clumped-isotope paleothermometry D. De Vleeschouwer M. Peral M. Marchegiano A. Füllberg N. Meinicke H. Pälike G. Auer B. Petrick C. Snoeck S. Goderis P. Claeys 2022-06-01T00:00:00Z https://doi.org/10.5194/cp-18-1231-2022 https://doaj.org/article/e97c4972ebdf4acd899c96a224fb24c2 EN eng Copernicus Publications https://cp.copernicus.org/articles/18/1231/2022/cp-18-1231-2022.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-18-1231-2022 1814-9324 1814-9332 https://doaj.org/article/e97c4972ebdf4acd899c96a224fb24c2 Climate of the Past, Vol 18, Pp 1231-1253 (2022) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2022 ftdoajarticles https://doi.org/10.5194/cp-18-1231-2022 2022-12-31T03:03:20Z The Pliocene sedimentary record provides a window into Earth's climate dynamics under warmer-than-present boundary conditions. However, the Pliocene cannot be considered a stable warm climate that constitutes a solid baseline for middle-of-the-road future climate projections. The increasing availability of time-continuous sedimentary archives (e.g., marine sediment cores) reveals complex temporal and spatial patterns of Pliocene ocean and climate variability on astronomical timescales. The Perth Basin is particularly interesting in that respect because it remains unclear if and how the Leeuwin Current sustained the comparably wet Pliocene climate in Western Australia, as well as how it influenced Southern Hemisphere paleoclimate variability. To constrain Leeuwin Current dynamics in time and space, this project obtained eight clumped-isotope Δ 47 paleotemperatures and constructed a new orbitally resolved planktonic foraminifera ( Trilobatus sacculifer ) stable isotope record ( δ 18 O) for the Plio-Pleistocene (4–2 Ma) interval of International Ocean Discovery Program (IODP) Site U1459. These new data complement an existing TEX 86 record from the same site and similar planktonic isotope records from the Northern Carnarvon Basin (Ocean Drilling Program (ODP) Site 763 and IODP Site U1463). The comparison of TEX 86 and Δ 47 paleothermometers reveals that TEX 86 likely reflects sea surface temperatures (SSTs) with a seasonal warm bias (23.8–28.9 ∘ C), whereas T. sacculifer Δ 47 calcification temperatures probably echo mixed-layer temperatures at the studied Site U1459 (18.9–23.2 ∘ C). The isotopic δ 18 O gradient along a 19–29 ∘ S latitudinal transect, between 3.9 and 2.2 Ma, displays large variability, ranging between 0.5 ‰ and 2.0 ‰. We use the latitudinal δ 18 O gradient as a proxy for Leeuwin Current strength, with an inverse relationship between both. The new results challenge the interpretation that suggested a tectonic event in the Indonesian Throughflow as the cause for the rapid steepening of the isotopic ... Article in Journal/Newspaper Planktonic foraminifera Directory of Open Access Journals: DOAJ Articles Indian Climate of the Past 18 5 1231 1253 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 D. De Vleeschouwer M. Peral M. Marchegiano A. Füllberg N. Meinicke H. Pälike G. Auer B. Petrick C. Snoeck S. Goderis P. Claeys Plio-Pleistocene Perth Basin water temperatures and Leeuwin Current dynamics (Indian Ocean) derived from oxygen and clumped-isotope paleothermometry |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
The Pliocene sedimentary record provides a window into Earth's climate dynamics under warmer-than-present boundary conditions. However, the Pliocene cannot be considered a stable warm climate that constitutes a solid baseline for middle-of-the-road future climate projections. The increasing availability of time-continuous sedimentary archives (e.g., marine sediment cores) reveals complex temporal and spatial patterns of Pliocene ocean and climate variability on astronomical timescales. The Perth Basin is particularly interesting in that respect because it remains unclear if and how the Leeuwin Current sustained the comparably wet Pliocene climate in Western Australia, as well as how it influenced Southern Hemisphere paleoclimate variability. To constrain Leeuwin Current dynamics in time and space, this project obtained eight clumped-isotope Δ 47 paleotemperatures and constructed a new orbitally resolved planktonic foraminifera ( Trilobatus sacculifer ) stable isotope record ( δ 18 O) for the Plio-Pleistocene (4–2 Ma) interval of International Ocean Discovery Program (IODP) Site U1459. These new data complement an existing TEX 86 record from the same site and similar planktonic isotope records from the Northern Carnarvon Basin (Ocean Drilling Program (ODP) Site 763 and IODP Site U1463). The comparison of TEX 86 and Δ 47 paleothermometers reveals that TEX 86 likely reflects sea surface temperatures (SSTs) with a seasonal warm bias (23.8–28.9 ∘ C), whereas T. sacculifer Δ 47 calcification temperatures probably echo mixed-layer temperatures at the studied Site U1459 (18.9–23.2 ∘ C). The isotopic δ 18 O gradient along a 19–29 ∘ S latitudinal transect, between 3.9 and 2.2 Ma, displays large variability, ranging between 0.5 ‰ and 2.0 ‰. We use the latitudinal δ 18 O gradient as a proxy for Leeuwin Current strength, with an inverse relationship between both. The new results challenge the interpretation that suggested a tectonic event in the Indonesian Throughflow as the cause for the rapid steepening of the isotopic ... |
format |
Article in Journal/Newspaper |
author |
D. De Vleeschouwer M. Peral M. Marchegiano A. Füllberg N. Meinicke H. Pälike G. Auer B. Petrick C. Snoeck S. Goderis P. Claeys |
author_facet |
D. De Vleeschouwer M. Peral M. Marchegiano A. Füllberg N. Meinicke H. Pälike G. Auer B. Petrick C. Snoeck S. Goderis P. Claeys |
author_sort |
D. De Vleeschouwer |
title |
Plio-Pleistocene Perth Basin water temperatures and Leeuwin Current dynamics (Indian Ocean) derived from oxygen and clumped-isotope paleothermometry |
title_short |
Plio-Pleistocene Perth Basin water temperatures and Leeuwin Current dynamics (Indian Ocean) derived from oxygen and clumped-isotope paleothermometry |
title_full |
Plio-Pleistocene Perth Basin water temperatures and Leeuwin Current dynamics (Indian Ocean) derived from oxygen and clumped-isotope paleothermometry |
title_fullStr |
Plio-Pleistocene Perth Basin water temperatures and Leeuwin Current dynamics (Indian Ocean) derived from oxygen and clumped-isotope paleothermometry |
title_full_unstemmed |
Plio-Pleistocene Perth Basin water temperatures and Leeuwin Current dynamics (Indian Ocean) derived from oxygen and clumped-isotope paleothermometry |
title_sort |
plio-pleistocene perth basin water temperatures and leeuwin current dynamics (indian ocean) derived from oxygen and clumped-isotope paleothermometry |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/cp-18-1231-2022 https://doaj.org/article/e97c4972ebdf4acd899c96a224fb24c2 |
geographic |
Indian |
geographic_facet |
Indian |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Climate of the Past, Vol 18, Pp 1231-1253 (2022) |
op_relation |
https://cp.copernicus.org/articles/18/1231/2022/cp-18-1231-2022.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-18-1231-2022 1814-9324 1814-9332 https://doaj.org/article/e97c4972ebdf4acd899c96a224fb24c2 |
op_doi |
https://doi.org/10.5194/cp-18-1231-2022 |
container_title |
Climate of the Past |
container_volume |
18 |
container_issue |
5 |
container_start_page |
1231 |
op_container_end_page |
1253 |
_version_ |
1766170511514009600 |