A sub-decadal record of East Antarctic biological productivity, and ocean-ice interactions over the Holocene from an ultra-expanded continental shelf sediment drift
AGU Fall Meeting, in San Francisco (EE.UU), 9-13 december 2019 n 2010, International Ocean Discovery Programme site U1357 retrieved a 180 m thick sedimentary sequence from the Adélie Land continental shelf, offshore of the East Antarctic Ice Sheet. The core targeted an expanded sediment drift (terme...
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ftcsic:oai:digital.csic.es:10261/207412 2024-02-11T09:57:25+01:00 A sub-decadal record of East Antarctic biological productivity, and ocean-ice interactions over the Holocene from an ultra-expanded continental shelf sediment drift McKay, Robert M. Johnson, Katelyn M. Newton, Kate Anya, Albot B. Bendle, James A. Jiménez Espejo, Francisco J. Etourneau, Johan Crosta, Xavier Riesselman, Christina R. Horgan, Huw Joseph Bertler, Nancy A. N. Escutia, Carlota Dunbar, Robert B. 2019-12-09 http://hdl.handle.net/10261/207412 unknown Sí AGU Fall Meeting (2019) http://hdl.handle.net/10261/207412 none póster de congreso http://purl.org/coar/resource_type/c_6670 2019 ftcsic 2024-01-16T10:51:55Z AGU Fall Meeting, in San Francisco (EE.UU), 9-13 december 2019 n 2010, International Ocean Discovery Programme site U1357 retrieved a 180 m thick sedimentary sequence from the Adélie Land continental shelf, offshore of the East Antarctic Ice Sheet. The core targeted an expanded sediment drift (termed the Adélie Drift) that provides an ultra-high resolution record of Holocene climate variability adjacent to the Mertz Polynya system, one of the largest exporters of sea ice and Antarctic Bottom Water along the East Antarctic margin. Sedimentation at this site is dominated by pelagic biosiliceous sedimentation with accumulation rates averaging ~1.5-2 cm/year, but is heavily influenced by sediment advection by the westward flowing Antarctic Coastal Current. Previously obtained Holocene marine archives have orders of magnitude lower sedimentation rates, and commonly alternate between massive (bioturbated) and laminated diatom ooze, which obscures the ability to resolve high-frequency change at sub-decadal scales. However, U1357B is continuously laminated, and combined with high sedimentation rates, affords an unprecedented opportunity to assess sub-decadal resolution climate and biological responses at the Antarctic oceanic margin. Specifically, this record identifies El Niño Southern Ocean (ENSO) teleconnections that could account for sea-ice variability, nutrient delivery and high productivity bloom events in the coastal polynyas along Adélie Land throughout the Holocene. Here, we discuss sedimentary processes associated with formation of the Adélie Drift deposit, and how reconstructions of sediment advection through time can be used to identify shifts in current strength through the Holocene. These currents are driven by katabatic and zonal winds, and are a strong influence on biological productivity in the region. Climatic conditions over the last 11,400 years are reconstructed using a range of CT scan images, lipid biomarkers, diatom analysis, and physical/geochemical core properties. Shifting sensitivity of ... Still Image Antarc* Antarctic Ice Sheet Sea ice Southern Ocean Digital.CSIC (Spanish National Research Council) Antarctic East Antarctic Ice Sheet Southern Ocean The Antarctic |
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Open Polar |
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Digital.CSIC (Spanish National Research Council) |
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ftcsic |
language |
unknown |
description |
AGU Fall Meeting, in San Francisco (EE.UU), 9-13 december 2019 n 2010, International Ocean Discovery Programme site U1357 retrieved a 180 m thick sedimentary sequence from the Adélie Land continental shelf, offshore of the East Antarctic Ice Sheet. The core targeted an expanded sediment drift (termed the Adélie Drift) that provides an ultra-high resolution record of Holocene climate variability adjacent to the Mertz Polynya system, one of the largest exporters of sea ice and Antarctic Bottom Water along the East Antarctic margin. Sedimentation at this site is dominated by pelagic biosiliceous sedimentation with accumulation rates averaging ~1.5-2 cm/year, but is heavily influenced by sediment advection by the westward flowing Antarctic Coastal Current. Previously obtained Holocene marine archives have orders of magnitude lower sedimentation rates, and commonly alternate between massive (bioturbated) and laminated diatom ooze, which obscures the ability to resolve high-frequency change at sub-decadal scales. However, U1357B is continuously laminated, and combined with high sedimentation rates, affords an unprecedented opportunity to assess sub-decadal resolution climate and biological responses at the Antarctic oceanic margin. Specifically, this record identifies El Niño Southern Ocean (ENSO) teleconnections that could account for sea-ice variability, nutrient delivery and high productivity bloom events in the coastal polynyas along Adélie Land throughout the Holocene. Here, we discuss sedimentary processes associated with formation of the Adélie Drift deposit, and how reconstructions of sediment advection through time can be used to identify shifts in current strength through the Holocene. These currents are driven by katabatic and zonal winds, and are a strong influence on biological productivity in the region. Climatic conditions over the last 11,400 years are reconstructed using a range of CT scan images, lipid biomarkers, diatom analysis, and physical/geochemical core properties. Shifting sensitivity of ... |
format |
Still Image |
author |
McKay, Robert M. Johnson, Katelyn M. Newton, Kate Anya, Albot B. Bendle, James A. Jiménez Espejo, Francisco J. Etourneau, Johan Crosta, Xavier Riesselman, Christina R. Horgan, Huw Joseph Bertler, Nancy A. N. Escutia, Carlota Dunbar, Robert B. |
spellingShingle |
McKay, Robert M. Johnson, Katelyn M. Newton, Kate Anya, Albot B. Bendle, James A. Jiménez Espejo, Francisco J. Etourneau, Johan Crosta, Xavier Riesselman, Christina R. Horgan, Huw Joseph Bertler, Nancy A. N. Escutia, Carlota Dunbar, Robert B. A sub-decadal record of East Antarctic biological productivity, and ocean-ice interactions over the Holocene from an ultra-expanded continental shelf sediment drift |
author_facet |
McKay, Robert M. Johnson, Katelyn M. Newton, Kate Anya, Albot B. Bendle, James A. Jiménez Espejo, Francisco J. Etourneau, Johan Crosta, Xavier Riesselman, Christina R. Horgan, Huw Joseph Bertler, Nancy A. N. Escutia, Carlota Dunbar, Robert B. |
author_sort |
McKay, Robert M. |
title |
A sub-decadal record of East Antarctic biological productivity, and ocean-ice interactions over the Holocene from an ultra-expanded continental shelf sediment drift |
title_short |
A sub-decadal record of East Antarctic biological productivity, and ocean-ice interactions over the Holocene from an ultra-expanded continental shelf sediment drift |
title_full |
A sub-decadal record of East Antarctic biological productivity, and ocean-ice interactions over the Holocene from an ultra-expanded continental shelf sediment drift |
title_fullStr |
A sub-decadal record of East Antarctic biological productivity, and ocean-ice interactions over the Holocene from an ultra-expanded continental shelf sediment drift |
title_full_unstemmed |
A sub-decadal record of East Antarctic biological productivity, and ocean-ice interactions over the Holocene from an ultra-expanded continental shelf sediment drift |
title_sort |
sub-decadal record of east antarctic biological productivity, and ocean-ice interactions over the holocene from an ultra-expanded continental shelf sediment drift |
publishDate |
2019 |
url |
http://hdl.handle.net/10261/207412 |
geographic |
Antarctic East Antarctic Ice Sheet Southern Ocean The Antarctic |
geographic_facet |
Antarctic East Antarctic Ice Sheet Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Ice Sheet Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Ice Sheet Sea ice Southern Ocean |
op_relation |
Sí AGU Fall Meeting (2019) http://hdl.handle.net/10261/207412 |
op_rights |
none |
_version_ |
1790609711808118784 |