(Table 2) Radiocarbon ages of eastern equatorial Pacific sediment cores
We use planktonic oxygen isotope (d18O) records spanning the last 30,000 years (kyr) to constrain the magnitude and spatial pattern of glacial cooling in the upwelling environment of the eastern equatorial Pacific (EEP). Fourteen new downcore d18O records were obtained from surface-dwelling plankton...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.841354 2023-05-15T18:01:12+02:00 (Table 2) Radiocarbon ages of eastern equatorial Pacific sediment cores Koutavas, Athanasios Lynch-Stieglitz, Jean MEDIAN LATITUDE: -1.802125 * MEDIAN LONGITUDE: -89.121250 * SOUTH-BOUND LATITUDE: -5.517000 * WEST-BOUND LONGITUDE: -106.800000 * NORTH-BOUND LATITUDE: 0.950000 * EAST-BOUND LONGITUDE: -82.070000 * DATE/TIME START: 1963-04-05T00:00:00 * DATE/TIME END: 1970-06-11T00:00:00 * MINIMUM DEPTH, sediment/rock: 0.000 m * MAXIMUM DEPTH, sediment/rock: 4.000 m 2003-01-08 text/tab-separated-values, 215 data points https://doi.pangaea.de/10.1594/PANGAEA.841354 https://doi.org/10.1594/PANGAEA.841354 en eng PANGAEA Faul, Kristina L; Ravelo, Ana Christina; Delaney, Margaret Lois (2000): Reconstructions of upwelling, productivity, and photic zone depth in the eastern equatorial Pacific Ocean using planktonic foraminiferal stable isotopes and abundances. Journal of Foraminiferal Research, 30(2), 110-125, https://doi.org/10.2113/0300110 https://doi.pangaea.de/10.1594/PANGAEA.841354 https://doi.org/10.1594/PANGAEA.841354 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Koutavas, Athanasios; Lynch-Stieglitz, Jean (2003): Glacial-interglacial dynamics of the eastern equatorial Pacific cold tongue-Intertropical Convergence Zone system reconstructed from oxygen isotope records. Paleoceanography, 18(4), 1089, https://doi.org/10.1029/2003PA000894 Age 14C AMS 14C calibrated CALIB 4.3 (Stuiver et al. 1998) dated difference error Calendar age maximum/old minimum/young DEPTH sediment/rock Elevation of event Event label Laboratory code/label Latitude of event Longitude of event PC Piston corer RC08 RC08-102 RC11 RC1112 RC11-238 RC13 RC13-140 Robert Conrad V19 V19-27 V19-28 V21 V21-29 V21-30 V21-40 Vema Dataset 2003 ftpangaea https://doi.org/10.1594/PANGAEA.841354 https://doi.org/10.1029/2003PA000894 https://doi.org/10.2113/0300110 2023-01-20T09:05:00Z We use planktonic oxygen isotope (d18O) records spanning the last 30,000 years (kyr) to constrain the magnitude and spatial pattern of glacial cooling in the upwelling environment of the eastern equatorial Pacific (EEP). Fourteen new downcore d18O records were obtained from surface-dwelling planktonic foraminifera Globigerinoides sacculifer and Globigerinoides ruber in eight cores from the upwelling tongue of the EEP. All sites have sedimentation rates exceeding 5 cm/kyr and, with one exception, lie above the modern depth of the foraminiferal lysocline. Sites directly underlying the cool band of upwelling immediately south of the equator record mean late Holocene (LH)-Last Glacial Maximum (LGM) d18O amplitudes ranging between 1.0 and 1.3 per mil. We estimate that mean sea surface temperatures (SST) in this region during the LGM were on average 1.5 ± 0.5°C lower than the LH. Larger d18O amplitudes are observed in sites north of the equator, indicating a spatial pattern of reduced meridional SST gradient across the equator during the LGM. This result is supported by comparison of Mg/Ca SST reconstructions from two sites straddling the equator. We interpret the reduction of this gradient during the LGM as evidence for a less intense cold tongue-Intertropical Convergence Zone (ITCZ) frontal system, a more southerly position of the ITCZ, and weaker southeast equatorial trades in the EEP. Dataset Planktonic foraminifera PANGAEA - Data Publisher for Earth & Environmental Science Pacific ENVELOPE(-106.800000,-82.070000,0.950000,-5.517000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Age 14C AMS 14C calibrated CALIB 4.3 (Stuiver et al. 1998) dated difference error Calendar age maximum/old minimum/young DEPTH sediment/rock Elevation of event Event label Laboratory code/label Latitude of event Longitude of event PC Piston corer RC08 RC08-102 RC11 RC1112 RC11-238 RC13 RC13-140 Robert Conrad V19 V19-27 V19-28 V21 V21-29 V21-30 V21-40 Vema |
spellingShingle |
Age 14C AMS 14C calibrated CALIB 4.3 (Stuiver et al. 1998) dated difference error Calendar age maximum/old minimum/young DEPTH sediment/rock Elevation of event Event label Laboratory code/label Latitude of event Longitude of event PC Piston corer RC08 RC08-102 RC11 RC1112 RC11-238 RC13 RC13-140 Robert Conrad V19 V19-27 V19-28 V21 V21-29 V21-30 V21-40 Vema Koutavas, Athanasios Lynch-Stieglitz, Jean (Table 2) Radiocarbon ages of eastern equatorial Pacific sediment cores |
topic_facet |
Age 14C AMS 14C calibrated CALIB 4.3 (Stuiver et al. 1998) dated difference error Calendar age maximum/old minimum/young DEPTH sediment/rock Elevation of event Event label Laboratory code/label Latitude of event Longitude of event PC Piston corer RC08 RC08-102 RC11 RC1112 RC11-238 RC13 RC13-140 Robert Conrad V19 V19-27 V19-28 V21 V21-29 V21-30 V21-40 Vema |
description |
We use planktonic oxygen isotope (d18O) records spanning the last 30,000 years (kyr) to constrain the magnitude and spatial pattern of glacial cooling in the upwelling environment of the eastern equatorial Pacific (EEP). Fourteen new downcore d18O records were obtained from surface-dwelling planktonic foraminifera Globigerinoides sacculifer and Globigerinoides ruber in eight cores from the upwelling tongue of the EEP. All sites have sedimentation rates exceeding 5 cm/kyr and, with one exception, lie above the modern depth of the foraminiferal lysocline. Sites directly underlying the cool band of upwelling immediately south of the equator record mean late Holocene (LH)-Last Glacial Maximum (LGM) d18O amplitudes ranging between 1.0 and 1.3 per mil. We estimate that mean sea surface temperatures (SST) in this region during the LGM were on average 1.5 ± 0.5°C lower than the LH. Larger d18O amplitudes are observed in sites north of the equator, indicating a spatial pattern of reduced meridional SST gradient across the equator during the LGM. This result is supported by comparison of Mg/Ca SST reconstructions from two sites straddling the equator. We interpret the reduction of this gradient during the LGM as evidence for a less intense cold tongue-Intertropical Convergence Zone (ITCZ) frontal system, a more southerly position of the ITCZ, and weaker southeast equatorial trades in the EEP. |
format |
Dataset |
author |
Koutavas, Athanasios Lynch-Stieglitz, Jean |
author_facet |
Koutavas, Athanasios Lynch-Stieglitz, Jean |
author_sort |
Koutavas, Athanasios |
title |
(Table 2) Radiocarbon ages of eastern equatorial Pacific sediment cores |
title_short |
(Table 2) Radiocarbon ages of eastern equatorial Pacific sediment cores |
title_full |
(Table 2) Radiocarbon ages of eastern equatorial Pacific sediment cores |
title_fullStr |
(Table 2) Radiocarbon ages of eastern equatorial Pacific sediment cores |
title_full_unstemmed |
(Table 2) Radiocarbon ages of eastern equatorial Pacific sediment cores |
title_sort |
(table 2) radiocarbon ages of eastern equatorial pacific sediment cores |
publisher |
PANGAEA |
publishDate |
2003 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.841354 https://doi.org/10.1594/PANGAEA.841354 |
op_coverage |
MEDIAN LATITUDE: -1.802125 * MEDIAN LONGITUDE: -89.121250 * SOUTH-BOUND LATITUDE: -5.517000 * WEST-BOUND LONGITUDE: -106.800000 * NORTH-BOUND LATITUDE: 0.950000 * EAST-BOUND LONGITUDE: -82.070000 * DATE/TIME START: 1963-04-05T00:00:00 * DATE/TIME END: 1970-06-11T00:00:00 * MINIMUM DEPTH, sediment/rock: 0.000 m * MAXIMUM DEPTH, sediment/rock: 4.000 m |
long_lat |
ENVELOPE(-106.800000,-82.070000,0.950000,-5.517000) |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Supplement to: Koutavas, Athanasios; Lynch-Stieglitz, Jean (2003): Glacial-interglacial dynamics of the eastern equatorial Pacific cold tongue-Intertropical Convergence Zone system reconstructed from oxygen isotope records. Paleoceanography, 18(4), 1089, https://doi.org/10.1029/2003PA000894 |
op_relation |
Faul, Kristina L; Ravelo, Ana Christina; Delaney, Margaret Lois (2000): Reconstructions of upwelling, productivity, and photic zone depth in the eastern equatorial Pacific Ocean using planktonic foraminiferal stable isotopes and abundances. Journal of Foraminiferal Research, 30(2), 110-125, https://doi.org/10.2113/0300110 https://doi.pangaea.de/10.1594/PANGAEA.841354 https://doi.org/10.1594/PANGAEA.841354 |
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.841354 https://doi.org/10.1029/2003PA000894 https://doi.org/10.2113/0300110 |
_version_ |
1766170575739289600 |