Calcite accumulation in the eastern equatorial Pacific
The eastern equatorial Pacific (EEP) is an important center of biological productivity, generating significant organic carbon and calcite fluxes to the deep ocean. We reconstructed paleocalcite flux for the past 30,000 years in four cores collected beneath the equatorial upwelling and the South Equa...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.839228 2024-09-15T18:37:16+00:00 Calcite accumulation in the eastern equatorial Pacific Loubere, Paul Mekik, Figen Francois, Roger Pichat, Sylvain MEDIAN LATITUDE: -0.773261 * MEDIAN LONGITUDE: -98.673359 * SOUTH-BOUND LATITUDE: -3.094930 * WEST-BOUND LONGITUDE: -110.519710 * NORTH-BOUND LATITUDE: 0.183050 * EAST-BOUND LONGITUDE: -86.483330 * DATE/TIME START: 1970-04-26T00:00:00 * DATE/TIME END: 1991-06-10T12:04:00 2004 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.839228 https://doi.org/10.1594/PANGAEA.839228 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.839228 https://doi.org/10.1594/PANGAEA.839228 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Loubere, Paul; Mekik, Figen; Francois, Roger; Pichat, Sylvain (2004): Export fluxes of calcite in the eastern equatorial Pacific from the Last Glacial Maximum to present. Paleoceanography, 19(2), PA2018, https://doi.org/10.1029/2003PA000986 Ocean Drilling Program ODP dataset publication series 2004 ftpangaea https://doi.org/10.1594/PANGAEA.83922810.1029/2003PA000986 2024-08-21T00:02:25Z The eastern equatorial Pacific (EEP) is an important center of biological productivity, generating significant organic carbon and calcite fluxes to the deep ocean. We reconstructed paleocalcite flux for the past 30,000 years in four cores collected beneath the equatorial upwelling and the South Equatorial Current (SEC) by measuring ex230Th-normalized calcite accumulation rates corrected for dissolution with a newly developed proxy for "fraction of calcite preserved". This method produced very similar results at the four sites and revealed that the export flux of calcite was 30-50% lower during the LGM compared to the Holocene. The internal consistency of these results supports our interpretation, which is also in agreement with emerging data indicating lower glacial productivity in the EEP, possibly as a result of lower nutrient supply from the southern ocean via the Equatorial Undercurrent. However, these findings contradict previous interpretations based on mass accumulation rates (MAR) of biogenic material in the sediment of the EEP, which have been taken as reflecting higher glacial productivity due to stronger wind-driven upwelling. Other/Unknown Material Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-110.519710,-86.483330,0.183050,-3.094930) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Ocean Drilling Program ODP |
spellingShingle |
Ocean Drilling Program ODP Loubere, Paul Mekik, Figen Francois, Roger Pichat, Sylvain Calcite accumulation in the eastern equatorial Pacific |
topic_facet |
Ocean Drilling Program ODP |
description |
The eastern equatorial Pacific (EEP) is an important center of biological productivity, generating significant organic carbon and calcite fluxes to the deep ocean. We reconstructed paleocalcite flux for the past 30,000 years in four cores collected beneath the equatorial upwelling and the South Equatorial Current (SEC) by measuring ex230Th-normalized calcite accumulation rates corrected for dissolution with a newly developed proxy for "fraction of calcite preserved". This method produced very similar results at the four sites and revealed that the export flux of calcite was 30-50% lower during the LGM compared to the Holocene. The internal consistency of these results supports our interpretation, which is also in agreement with emerging data indicating lower glacial productivity in the EEP, possibly as a result of lower nutrient supply from the southern ocean via the Equatorial Undercurrent. However, these findings contradict previous interpretations based on mass accumulation rates (MAR) of biogenic material in the sediment of the EEP, which have been taken as reflecting higher glacial productivity due to stronger wind-driven upwelling. |
format |
Other/Unknown Material |
author |
Loubere, Paul Mekik, Figen Francois, Roger Pichat, Sylvain |
author_facet |
Loubere, Paul Mekik, Figen Francois, Roger Pichat, Sylvain |
author_sort |
Loubere, Paul |
title |
Calcite accumulation in the eastern equatorial Pacific |
title_short |
Calcite accumulation in the eastern equatorial Pacific |
title_full |
Calcite accumulation in the eastern equatorial Pacific |
title_fullStr |
Calcite accumulation in the eastern equatorial Pacific |
title_full_unstemmed |
Calcite accumulation in the eastern equatorial Pacific |
title_sort |
calcite accumulation in the eastern equatorial pacific |
publisher |
PANGAEA |
publishDate |
2004 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.839228 https://doi.org/10.1594/PANGAEA.839228 |
op_coverage |
MEDIAN LATITUDE: -0.773261 * MEDIAN LONGITUDE: -98.673359 * SOUTH-BOUND LATITUDE: -3.094930 * WEST-BOUND LONGITUDE: -110.519710 * NORTH-BOUND LATITUDE: 0.183050 * EAST-BOUND LONGITUDE: -86.483330 * DATE/TIME START: 1970-04-26T00:00:00 * DATE/TIME END: 1991-06-10T12:04:00 |
long_lat |
ENVELOPE(-110.519710,-86.483330,0.183050,-3.094930) |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Supplement to: Loubere, Paul; Mekik, Figen; Francois, Roger; Pichat, Sylvain (2004): Export fluxes of calcite in the eastern equatorial Pacific from the Last Glacial Maximum to present. Paleoceanography, 19(2), PA2018, https://doi.org/10.1029/2003PA000986 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.839228 https://doi.org/10.1594/PANGAEA.839228 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.83922810.1029/2003PA000986 |
_version_ |
1810481623347494912 |