Holocene climate variability in northwestern Ross Sea area, East Antarctica
In this study, particular attention has been paid to sea ice evolution in northwestern Ross Sea since seasonal sea ice variability is crucial to accurately reconstruct the main paleoclimatic variations and to confidently predict future climate changes. Indeed, sea ice influences global climate dynam...
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ftuniveneziairis:oai:iris.unive.it:10278/42753 2024-01-28T10:00:54+01:00 Holocene climate variability in northwestern Ross Sea area, East Antarctica K. MEZGEC R. MELIS X. CROSTA R. TRAVERSI M. SEVERI M. BRAIDA E. COLIZZA STENNI, Barbara FIST-Federazione Italiana Scienze della Terra K., Mezgec R., Meli X., Crosta R., Traversi M., Severi Stenni, Barbara M., Braida E., Colizza 2013 http://hdl.handle.net/10278/42753 eng eng FIST, Federazione Italiana di Scienze della Terra Geoitalia 2013 ispartofbook:EPITOME 2013 - GEOITALIA 2013 - IX Forum italiano Scienze della Terra GEOITALIA 2013 - IX Forum italiano Scienze della Terra firstpage:"-" lastpage:"-" numberofpages:1 journal:EPITOME http://hdl.handle.net/10278/42753 info:eu-repo/semantics/closedAccess ice core paleoclimate Antarctica sediment cores info:eu-repo/semantics/conferenceObject 2013 ftuniveneziairis 2024-01-03T17:44:58Z In this study, particular attention has been paid to sea ice evolution in northwestern Ross Sea since seasonal sea ice variability is crucial to accurately reconstruct the main paleoclimatic variations and to confidently predict future climate changes. Indeed, sea ice influences global climate dynamics through several physical oceanic and atmospheric processes such as albedo, energy balance, latitudinal thermal gradient and bottom water formation. This study is part of the ESF PolarCLIMATE HOLOCLIP (Holocene climate variability at highsouthern latitudes: an integrated perspective) Project that aims to bring together the sediment core, the ice core and the modelling scientific communities with the intention of understanding the processes linking different components of the Antarctica climate system. Diatom analyses were carried out on three sediment cores collected from the northwestern Ross Sea and covering the Holocene period. Core c20 from Cape Hallett and core c43 from Wood Bay were both collected at coastal sites, while core cJ5 from Joides Basin area was retrieved in a more open environment. Diatom counts suggest that in coastal sites the sea ice duration increased over the last 4 ka BP (thousand of years before present), while in the open ocean site conversely sea ice increased between 10-6 ka BP and subsequently slightly decreased between 6-1 ka BP. Diatom records in c20 and c43 cores are similar to other coastal core records from East Antarctica, while cJ5 diatom record shows more similar environmental conditions to the core from the Polar Front Zone. Since integrating proxies from different realms (marine and glacial) could provide us a more complete view of the climate and environmental changes occurring during the Holocene, a comparison was performed between the sea ice diatom Fragilariopsis curta relative abundances in the three sediment cores and the sea-salt Na records (a potential proxy of sea ice extend/persistence) from Talos Dome and Taylor Dome ice cores. Significant positive correlations ... Conference Object Antarc* Antarctica East Antarctica ice core Ross Sea Sea ice Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) East Antarctica Ross Sea Talos Dome ENVELOPE(158.000,158.000,-73.000,-73.000) Hallett ENVELOPE(170.217,170.217,-72.317,-72.317) Taylor Dome ENVELOPE(157.667,157.667,-77.667,-77.667) Cape Hallett ENVELOPE(170.217,170.217,-72.317,-72.317) Wood Bay ENVELOPE(165.500,165.500,-74.217,-74.217) Joides Basin ENVELOPE(174.000,174.000,-74.500,-74.500) |
institution |
Open Polar |
collection |
Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) |
op_collection_id |
ftuniveneziairis |
language |
English |
topic |
ice core paleoclimate Antarctica sediment cores |
spellingShingle |
ice core paleoclimate Antarctica sediment cores K. MEZGEC R. MELIS X. CROSTA R. TRAVERSI M. SEVERI M. BRAIDA E. COLIZZA STENNI, Barbara Holocene climate variability in northwestern Ross Sea area, East Antarctica |
topic_facet |
ice core paleoclimate Antarctica sediment cores |
description |
In this study, particular attention has been paid to sea ice evolution in northwestern Ross Sea since seasonal sea ice variability is crucial to accurately reconstruct the main paleoclimatic variations and to confidently predict future climate changes. Indeed, sea ice influences global climate dynamics through several physical oceanic and atmospheric processes such as albedo, energy balance, latitudinal thermal gradient and bottom water formation. This study is part of the ESF PolarCLIMATE HOLOCLIP (Holocene climate variability at highsouthern latitudes: an integrated perspective) Project that aims to bring together the sediment core, the ice core and the modelling scientific communities with the intention of understanding the processes linking different components of the Antarctica climate system. Diatom analyses were carried out on three sediment cores collected from the northwestern Ross Sea and covering the Holocene period. Core c20 from Cape Hallett and core c43 from Wood Bay were both collected at coastal sites, while core cJ5 from Joides Basin area was retrieved in a more open environment. Diatom counts suggest that in coastal sites the sea ice duration increased over the last 4 ka BP (thousand of years before present), while in the open ocean site conversely sea ice increased between 10-6 ka BP and subsequently slightly decreased between 6-1 ka BP. Diatom records in c20 and c43 cores are similar to other coastal core records from East Antarctica, while cJ5 diatom record shows more similar environmental conditions to the core from the Polar Front Zone. Since integrating proxies from different realms (marine and glacial) could provide us a more complete view of the climate and environmental changes occurring during the Holocene, a comparison was performed between the sea ice diatom Fragilariopsis curta relative abundances in the three sediment cores and the sea-salt Na records (a potential proxy of sea ice extend/persistence) from Talos Dome and Taylor Dome ice cores. Significant positive correlations ... |
author2 |
FIST-Federazione Italiana Scienze della Terra K., Mezgec R., Meli X., Crosta R., Traversi M., Severi Stenni, Barbara M., Braida E., Colizza |
format |
Conference Object |
author |
K. MEZGEC R. MELIS X. CROSTA R. TRAVERSI M. SEVERI M. BRAIDA E. COLIZZA STENNI, Barbara |
author_facet |
K. MEZGEC R. MELIS X. CROSTA R. TRAVERSI M. SEVERI M. BRAIDA E. COLIZZA STENNI, Barbara |
author_sort |
K. MEZGEC |
title |
Holocene climate variability in northwestern Ross Sea area, East Antarctica |
title_short |
Holocene climate variability in northwestern Ross Sea area, East Antarctica |
title_full |
Holocene climate variability in northwestern Ross Sea area, East Antarctica |
title_fullStr |
Holocene climate variability in northwestern Ross Sea area, East Antarctica |
title_full_unstemmed |
Holocene climate variability in northwestern Ross Sea area, East Antarctica |
title_sort |
holocene climate variability in northwestern ross sea area, east antarctica |
publisher |
FIST, Federazione Italiana di Scienze della Terra Geoitalia 2013 |
publishDate |
2013 |
url |
http://hdl.handle.net/10278/42753 |
long_lat |
ENVELOPE(158.000,158.000,-73.000,-73.000) ENVELOPE(170.217,170.217,-72.317,-72.317) ENVELOPE(157.667,157.667,-77.667,-77.667) ENVELOPE(170.217,170.217,-72.317,-72.317) ENVELOPE(165.500,165.500,-74.217,-74.217) ENVELOPE(174.000,174.000,-74.500,-74.500) |
geographic |
East Antarctica Ross Sea Talos Dome Hallett Taylor Dome Cape Hallett Wood Bay Joides Basin |
geographic_facet |
East Antarctica Ross Sea Talos Dome Hallett Taylor Dome Cape Hallett Wood Bay Joides Basin |
genre |
Antarc* Antarctica East Antarctica ice core Ross Sea Sea ice |
genre_facet |
Antarc* Antarctica East Antarctica ice core Ross Sea Sea ice |
op_relation |
ispartofbook:EPITOME 2013 - GEOITALIA 2013 - IX Forum italiano Scienze della Terra GEOITALIA 2013 - IX Forum italiano Scienze della Terra firstpage:"-" lastpage:"-" numberofpages:1 journal:EPITOME http://hdl.handle.net/10278/42753 |
op_rights |
info:eu-repo/semantics/closedAccess |
_version_ |
1789325502611193856 |