Long sedimentary records of sediment cores from the Chilean margin
The Antarctic Intermediate Water (AAIW) is a key player in global-scale oceanic overturning processes and an important conduit for heat, fresh water, and carbon transport. The AAIW past variability is poorly understood mainly due to the lack of sedimentary archives at intermediate water depths. We p...
Main Authors: | , , , , , , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
2013
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.820619 https://doi.org/10.1594/PANGAEA.820619 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.820619 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.820619 2023-05-15T13:42:11+02:00 Long sedimentary records of sediment cores from the Chilean margin Martínez Méndez, Gema Hebbeln, Dierk Mohtadi, Mahyar Lamy, Frank De Pol-Holz, Ricardo Reyes-Macaya, Dharma Freudenthal, Tim MEDIAN LATITUDE: -24.633531 * MEDIAN LONGITUDE: -73.273993 * SOUTH-BOUND LATITUDE: -30.234667 * WEST-BOUND LONGITUDE: -95.024550 * NORTH-BOUND LATITUDE: 0.569890 * EAST-BOUND LONGITUDE: -70.645833 * DATE/TIME START: 2010-11-10T12:12:00 * DATE/TIME END: 2010-11-26T14:16:00 2013-10-21 application/zip, 11 datasets https://doi.pangaea.de/10.1594/PANGAEA.820619 https://doi.org/10.1594/PANGAEA.820619 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.820619 https://doi.org/10.1594/PANGAEA.820619 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Martínez Méndez, Gema; Hebbeln, Dierk; Mohtadi, Mahyar; Lamy, Frank; De Pol-Holz, Ricardo; Reyes-Macaya, Dharma; Freudenthal, Tim (2013): Changes in the advection of Antarctic Intermediate Water to the northern Chilean coast during the last 970 kyr. Paleoceanography, 28, 1-12, https://doi.org/10.1002/palo.20047 Center for Marine Environmental Sciences MARUM Dataset 2013 ftpangaea https://doi.org/10.1594/PANGAEA.820619 https://doi.org/10.1002/palo.20047 2023-01-20T07:33:09Z The Antarctic Intermediate Water (AAIW) is a key player in global-scale oceanic overturning processes and an important conduit for heat, fresh water, and carbon transport. The AAIW past variability is poorly understood mainly due to the lack of sedimentary archives at intermediate water depths. We present records of benthic stable isotopes from sediments retrieved with the seafloor drill rig MARUM-MeBo at 956 m water depth off northern Chile (GeoB15016, 27°29.48'S, 71°07.58'W) that extend back to 970 ka. The sediments at this site are presently deposited at the boundary between AAIW and Pacific Deep Water (PDW). For previous peak interglacials, our results reveal similar benthic d13C values at site GeoB15016 and of a newly generated stack of benthic d13C from various deep Pacific cores representing the "average PDW." This suggests, unlike today, the absence of AAIW at the site and the presence of nearly pure PDW. In contrast, more positive d13C values at site GeoB15016 compared to the stack imply a considerable AAIW contribution during cold phases of interglacials and especially during glacials. Besides, we used three short sediment cores to reconstruct benthic d13C values from the AAIW core during the last glacial and found a d13C signature similar to today's. Assuming that this was the case also for the past 970 kyr, we demonstrate that sea level changes and latitudinal migrations of the AAIW formation site can only account for about 50% of the full range of past d13C increases at site GeoB15016 during cold periods. Other processes that could explain the remaining of the positive d13C anomalies are increases in glacial AAIW production and/or deeper convection of the AAIW with respect to preceding interglacials. Dataset Antarc* Antarctic PANGAEA - Data Publisher for Earth & Environmental Science Antarctic The Antarctic Pacific ENVELOPE(-95.024550,-70.645833,0.569890,-30.234667) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Center for Marine Environmental Sciences MARUM |
spellingShingle |
Center for Marine Environmental Sciences MARUM Martínez Méndez, Gema Hebbeln, Dierk Mohtadi, Mahyar Lamy, Frank De Pol-Holz, Ricardo Reyes-Macaya, Dharma Freudenthal, Tim Long sedimentary records of sediment cores from the Chilean margin |
topic_facet |
Center for Marine Environmental Sciences MARUM |
description |
The Antarctic Intermediate Water (AAIW) is a key player in global-scale oceanic overturning processes and an important conduit for heat, fresh water, and carbon transport. The AAIW past variability is poorly understood mainly due to the lack of sedimentary archives at intermediate water depths. We present records of benthic stable isotopes from sediments retrieved with the seafloor drill rig MARUM-MeBo at 956 m water depth off northern Chile (GeoB15016, 27°29.48'S, 71°07.58'W) that extend back to 970 ka. The sediments at this site are presently deposited at the boundary between AAIW and Pacific Deep Water (PDW). For previous peak interglacials, our results reveal similar benthic d13C values at site GeoB15016 and of a newly generated stack of benthic d13C from various deep Pacific cores representing the "average PDW." This suggests, unlike today, the absence of AAIW at the site and the presence of nearly pure PDW. In contrast, more positive d13C values at site GeoB15016 compared to the stack imply a considerable AAIW contribution during cold phases of interglacials and especially during glacials. Besides, we used three short sediment cores to reconstruct benthic d13C values from the AAIW core during the last glacial and found a d13C signature similar to today's. Assuming that this was the case also for the past 970 kyr, we demonstrate that sea level changes and latitudinal migrations of the AAIW formation site can only account for about 50% of the full range of past d13C increases at site GeoB15016 during cold periods. Other processes that could explain the remaining of the positive d13C anomalies are increases in glacial AAIW production and/or deeper convection of the AAIW with respect to preceding interglacials. |
format |
Dataset |
author |
Martínez Méndez, Gema Hebbeln, Dierk Mohtadi, Mahyar Lamy, Frank De Pol-Holz, Ricardo Reyes-Macaya, Dharma Freudenthal, Tim |
author_facet |
Martínez Méndez, Gema Hebbeln, Dierk Mohtadi, Mahyar Lamy, Frank De Pol-Holz, Ricardo Reyes-Macaya, Dharma Freudenthal, Tim |
author_sort |
Martínez Méndez, Gema |
title |
Long sedimentary records of sediment cores from the Chilean margin |
title_short |
Long sedimentary records of sediment cores from the Chilean margin |
title_full |
Long sedimentary records of sediment cores from the Chilean margin |
title_fullStr |
Long sedimentary records of sediment cores from the Chilean margin |
title_full_unstemmed |
Long sedimentary records of sediment cores from the Chilean margin |
title_sort |
long sedimentary records of sediment cores from the chilean margin |
publisher |
PANGAEA |
publishDate |
2013 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.820619 https://doi.org/10.1594/PANGAEA.820619 |
op_coverage |
MEDIAN LATITUDE: -24.633531 * MEDIAN LONGITUDE: -73.273993 * SOUTH-BOUND LATITUDE: -30.234667 * WEST-BOUND LONGITUDE: -95.024550 * NORTH-BOUND LATITUDE: 0.569890 * EAST-BOUND LONGITUDE: -70.645833 * DATE/TIME START: 2010-11-10T12:12:00 * DATE/TIME END: 2010-11-26T14:16:00 |
long_lat |
ENVELOPE(-95.024550,-70.645833,0.569890,-30.234667) |
geographic |
Antarctic The Antarctic Pacific |
geographic_facet |
Antarctic The Antarctic Pacific |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Supplement to: Martínez Méndez, Gema; Hebbeln, Dierk; Mohtadi, Mahyar; Lamy, Frank; De Pol-Holz, Ricardo; Reyes-Macaya, Dharma; Freudenthal, Tim (2013): Changes in the advection of Antarctic Intermediate Water to the northern Chilean coast during the last 970 kyr. Paleoceanography, 28, 1-12, https://doi.org/10.1002/palo.20047 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.820619 https://doi.org/10.1594/PANGAEA.820619 |
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.820619 https://doi.org/10.1002/palo.20047 |
_version_ |
1766164554654416896 |