Figure 2. Downcore variations of total diatom concentration in core MD02-2529
The modern eastern equatorial Pacific (EEP) is a major natural source for atmospheric carbon dioxide and is thought to be connected to high-latitude ocean dynamics by oceanic teleconnections on glacial-interglacial timescales. A wealth of sedimentary records aiming at reconstructing last Quaternary...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.761421 2023-05-15T17:37:06+02:00 Figure 2. Downcore variations of total diatom concentration in core MD02-2529 Romero, Oscar E Leduc, Guillaume Vidal, Laurence Fischer, Gerhard LATITUDE: 8.205500 * LONGITUDE: -84.122000 * DATE/TIME START: 2002-06-23T05:05:00 * DATE/TIME END: 2002-06-23T05:05:00 * MINIMUM DEPTH, sediment/rock: 3.52 m * MAXIMUM DEPTH, sediment/rock: 15.73 m 2011-06-01 text/tab-separated-values, 380 data points https://doi.pangaea.de/10.1594/PANGAEA.761421 https://doi.org/10.1594/PANGAEA.761421 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.761421 https://doi.org/10.1594/PANGAEA.761421 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Romero, Oscar E; Leduc, Guillaume; Vidal, Laurence; Fischer, Gerhard (2011): Millennial variability and long-term changes of the diatom production in the eastern equatorial Pacific during the last glacial cycle. Paleoceanography, 26, PA2212, https://doi.org/10.1029/2010PA002099 Center for Marine Environmental Sciences Cocos Ridge DEPTH sediment/rock Diatoms total abundance per unit sediment mass Giant piston corer GPC IMAGES IMAGES VIII - MONA International Marine Global Change Study Marion Dufresne (1995) MARUM MD022529 MD02-2529 MD126 Dataset 2011 ftpangaea https://doi.org/10.1594/PANGAEA.761421 https://doi.org/10.1029/2010PA002099 2023-01-20T08:52:19Z The modern eastern equatorial Pacific (EEP) is a major natural source for atmospheric carbon dioxide and is thought to be connected to high-latitude ocean dynamics by oceanic teleconnections on glacial-interglacial timescales. A wealth of sedimentary records aiming at reconstructing last Quaternary changes in primary productivity and nutrient utilization have been devoted to understanding those linkages between the EEP and other distant oceanic areas. Most of these records are, however, clustered in the pelagic EEP cold tongue, with comparatively little attention devoted to coastal areas. Here we present downcore measurements of the composition and concentration of the diatom assemblage together with opal (biogenic silica) concentration at site MD02-2529 recovered in the coastal Panama Basin. Piston core MD02-2529, collected in an area affected by a multitude of processes, provides evidence for strong variations in diatom production at the millennial timescale during the last glacial cycle. The maxima in total diatom concentration occurred during the early marine isotopic stage (MIS) 4 as well as during the MIS 4/3 transition and MIS 3. Rapid changes in diatom concentrations during the MIS 3 mimics Bond cycles as independently recorded by the SSS estimation derived from planktonic foraminifera from the same core. Such patterns indicate a clear linkage between diatom production in the coastal EEP and rapid climate changes in the high-latitude North Atlantic. In parallel, the long-term succession of the diatom community from coastal diatoms, predominantly thriving during MIS 5 and 4, towards pelagic diatoms, dominant during MIS 3 and 2, points to a long-term change in the surface hydrology. During Heinrich Events, diatoms strongly reduced their production, probably due to enhanced stratification in the upper water column. After the last glacial maximum, diatom production and valve preservation strongly decreased in response to the advection of nutrient (H2SiO4)-depleted, warmer water masses. Our high-resolution ... Dataset North Atlantic Planktonic foraminifera PANGAEA - Data Publisher for Earth & Environmental Science Pacific ENVELOPE(-84.122000,-84.122000,8.205500,8.205500) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Center for Marine Environmental Sciences Cocos Ridge DEPTH sediment/rock Diatoms total abundance per unit sediment mass Giant piston corer GPC IMAGES IMAGES VIII - MONA International Marine Global Change Study Marion Dufresne (1995) MARUM MD022529 MD02-2529 MD126 |
spellingShingle |
Center for Marine Environmental Sciences Cocos Ridge DEPTH sediment/rock Diatoms total abundance per unit sediment mass Giant piston corer GPC IMAGES IMAGES VIII - MONA International Marine Global Change Study Marion Dufresne (1995) MARUM MD022529 MD02-2529 MD126 Romero, Oscar E Leduc, Guillaume Vidal, Laurence Fischer, Gerhard Figure 2. Downcore variations of total diatom concentration in core MD02-2529 |
topic_facet |
Center for Marine Environmental Sciences Cocos Ridge DEPTH sediment/rock Diatoms total abundance per unit sediment mass Giant piston corer GPC IMAGES IMAGES VIII - MONA International Marine Global Change Study Marion Dufresne (1995) MARUM MD022529 MD02-2529 MD126 |
description |
The modern eastern equatorial Pacific (EEP) is a major natural source for atmospheric carbon dioxide and is thought to be connected to high-latitude ocean dynamics by oceanic teleconnections on glacial-interglacial timescales. A wealth of sedimentary records aiming at reconstructing last Quaternary changes in primary productivity and nutrient utilization have been devoted to understanding those linkages between the EEP and other distant oceanic areas. Most of these records are, however, clustered in the pelagic EEP cold tongue, with comparatively little attention devoted to coastal areas. Here we present downcore measurements of the composition and concentration of the diatom assemblage together with opal (biogenic silica) concentration at site MD02-2529 recovered in the coastal Panama Basin. Piston core MD02-2529, collected in an area affected by a multitude of processes, provides evidence for strong variations in diatom production at the millennial timescale during the last glacial cycle. The maxima in total diatom concentration occurred during the early marine isotopic stage (MIS) 4 as well as during the MIS 4/3 transition and MIS 3. Rapid changes in diatom concentrations during the MIS 3 mimics Bond cycles as independently recorded by the SSS estimation derived from planktonic foraminifera from the same core. Such patterns indicate a clear linkage between diatom production in the coastal EEP and rapid climate changes in the high-latitude North Atlantic. In parallel, the long-term succession of the diatom community from coastal diatoms, predominantly thriving during MIS 5 and 4, towards pelagic diatoms, dominant during MIS 3 and 2, points to a long-term change in the surface hydrology. During Heinrich Events, diatoms strongly reduced their production, probably due to enhanced stratification in the upper water column. After the last glacial maximum, diatom production and valve preservation strongly decreased in response to the advection of nutrient (H2SiO4)-depleted, warmer water masses. Our high-resolution ... |
format |
Dataset |
author |
Romero, Oscar E Leduc, Guillaume Vidal, Laurence Fischer, Gerhard |
author_facet |
Romero, Oscar E Leduc, Guillaume Vidal, Laurence Fischer, Gerhard |
author_sort |
Romero, Oscar E |
title |
Figure 2. Downcore variations of total diatom concentration in core MD02-2529 |
title_short |
Figure 2. Downcore variations of total diatom concentration in core MD02-2529 |
title_full |
Figure 2. Downcore variations of total diatom concentration in core MD02-2529 |
title_fullStr |
Figure 2. Downcore variations of total diatom concentration in core MD02-2529 |
title_full_unstemmed |
Figure 2. Downcore variations of total diatom concentration in core MD02-2529 |
title_sort |
figure 2. downcore variations of total diatom concentration in core md02-2529 |
publisher |
PANGAEA |
publishDate |
2011 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.761421 https://doi.org/10.1594/PANGAEA.761421 |
op_coverage |
LATITUDE: 8.205500 * LONGITUDE: -84.122000 * DATE/TIME START: 2002-06-23T05:05:00 * DATE/TIME END: 2002-06-23T05:05:00 * MINIMUM DEPTH, sediment/rock: 3.52 m * MAXIMUM DEPTH, sediment/rock: 15.73 m |
long_lat |
ENVELOPE(-84.122000,-84.122000,8.205500,8.205500) |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic Planktonic foraminifera |
genre_facet |
North Atlantic Planktonic foraminifera |
op_source |
Supplement to: Romero, Oscar E; Leduc, Guillaume; Vidal, Laurence; Fischer, Gerhard (2011): Millennial variability and long-term changes of the diatom production in the eastern equatorial Pacific during the last glacial cycle. Paleoceanography, 26, PA2212, https://doi.org/10.1029/2010PA002099 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.761421 https://doi.org/10.1594/PANGAEA.761421 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.761421 https://doi.org/10.1029/2010PA002099 |
_version_ |
1766136833900544000 |