Resolving sea ice dynamics in the north-western Ross Sea during the last 2.6 ka: From seasonal to millennial timescales
Time-series analyses of satellite images reveal that sea ice extent in the Ross Sea has experienced significant changes over the last 40 years, likely triggered by large-scale atmospheric anomalies. However, resolving how sea ice in the Ross Sea has changed over longer timeframes has until now remai...
Published in: | Quaternary Science Reviews |
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Online Access: | http://hdl.handle.net/11368/2965213 https://doi.org/10.1016/j.quascirev.2020.106299 https://www.sciencedirect.com/science/article/pii/S0277379120302614 |
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ftunitriestiris:oai:arts.units.it:11368/2965213 2023-05-15T18:07:31+02:00 Resolving sea ice dynamics in the north-western Ross Sea during the last 2.6 ka: From seasonal to millennial timescales Tesi T. Belt S. T. Gariboldi K. Muschitiello F. Smik L. Finocchiaro F. Giglio F. Colizza E. Gazzurra G. Giordano P. Morigi C. Capotondi L. Nogarotto A. Koseoglu D. Di Roberto A. Gallerani A. Langone L. Tesi, T. Belt, S. T. Gariboldi, K. Muschitiello, F. Smik, L. Finocchiaro, F. Giglio, F. Colizza, E. Gazzurra, G. Giordano, P. Morigi, C. Capotondi, L. Nogarotto, A. Koseoglu, D. Di Roberto, A. Gallerani, A. Langone, L. 2020 STAMPA http://hdl.handle.net/11368/2965213 https://doi.org/10.1016/j.quascirev.2020.106299 https://www.sciencedirect.com/science/article/pii/S0277379120302614 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000533150700011 volume:237 firstpage:106299 lastpage:"-" numberofpages:16 journal:QUATERNARY SCIENCE REVIEWS http://hdl.handle.net/11368/2965213 doi:10.1016/j.quascirev.2020.106299 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85083550633 https://www.sciencedirect.com/science/article/pii/S0277379120302614 info:eu-repo/semantics/closedAccess Fast ice IPSO 25 Laminated sediment Ross sea Sea ice info:eu-repo/semantics/article 2020 ftunitriestiris https://doi.org/10.1016/j.quascirev.2020.106299 2023-04-09T06:18:25Z Time-series analyses of satellite images reveal that sea ice extent in the Ross Sea has experienced significant changes over the last 40 years, likely triggered by large-scale atmospheric anomalies. However, resolving how sea ice in the Ross Sea has changed over longer timeframes has until now remained more elusive. Here we used a laminated sediment piston core (14.6 m) collected from the Edisto inlet (Western Ross Sea) to reconstruct fast ice dynamics over the last 2.6 ka. Our goal was to first understand the climate expression of selected well-defined sediment laminae and then use these characteristics for reconstructing past sea ice behaviour across the whole sedimentary sequence. We used the recently established sea ice diatom biomarker proxy IPSO25 in combination with diatom census counts and bulk analyses. Analyses performed on a suite of discrete laminae revealed statistically significant differences between dark and light laminae reflecting different depositional conditions. Based on their respective biogeochemical fingerprints, we infer that dark laminae accumulated during sea ice thaws in early summer. Under these conditions, laminae contain relatively high concentrations of IPSO25 and display an enriched δ13C composition for the bulk organic matter (OM). While diatom assemblages in dark laminae are relatively homogenous, as the thaw continues later in the summer, Corethron pennatum becomes the dominant diatom species, resulting in the formation of light laminae characterized by low IPSO25 concentrations. Since C. pennatum can migrate vertically through the water column to uptake nutrients and avoid competition in oligotrophic waters, its high concentration likely reflects stratified and ice-free surface waters typical of late summer. Down-core trends show that the correlation between sediment brightness and geochemical fingerprint (i.e., IPSO25 and δ13C) holds throughout the record. Based on the knowledge gained at lamina level, our down-core high-resolution reconstruction shows that the summer fast ... Article in Journal/Newspaper Ross Sea Sea ice Università degli studi di Trieste: ArTS (Archivio della ricerca di Trieste) Edisto ENVELOPE(-67.133,-67.133,-68.217,-68.217) Edisto Inlet ENVELOPE(170.083,170.083,-72.333,-72.333) Ross Sea Quaternary Science Reviews 237 106299 |
institution |
Open Polar |
collection |
Università degli studi di Trieste: ArTS (Archivio della ricerca di Trieste) |
op_collection_id |
ftunitriestiris |
language |
English |
topic |
Fast ice IPSO 25 Laminated sediment Ross sea Sea ice |
spellingShingle |
Fast ice IPSO 25 Laminated sediment Ross sea Sea ice Tesi T. Belt S. T. Gariboldi K. Muschitiello F. Smik L. Finocchiaro F. Giglio F. Colizza E. Gazzurra G. Giordano P. Morigi C. Capotondi L. Nogarotto A. Koseoglu D. Di Roberto A. Gallerani A. Langone L. Resolving sea ice dynamics in the north-western Ross Sea during the last 2.6 ka: From seasonal to millennial timescales |
topic_facet |
Fast ice IPSO 25 Laminated sediment Ross sea Sea ice |
description |
Time-series analyses of satellite images reveal that sea ice extent in the Ross Sea has experienced significant changes over the last 40 years, likely triggered by large-scale atmospheric anomalies. However, resolving how sea ice in the Ross Sea has changed over longer timeframes has until now remained more elusive. Here we used a laminated sediment piston core (14.6 m) collected from the Edisto inlet (Western Ross Sea) to reconstruct fast ice dynamics over the last 2.6 ka. Our goal was to first understand the climate expression of selected well-defined sediment laminae and then use these characteristics for reconstructing past sea ice behaviour across the whole sedimentary sequence. We used the recently established sea ice diatom biomarker proxy IPSO25 in combination with diatom census counts and bulk analyses. Analyses performed on a suite of discrete laminae revealed statistically significant differences between dark and light laminae reflecting different depositional conditions. Based on their respective biogeochemical fingerprints, we infer that dark laminae accumulated during sea ice thaws in early summer. Under these conditions, laminae contain relatively high concentrations of IPSO25 and display an enriched δ13C composition for the bulk organic matter (OM). While diatom assemblages in dark laminae are relatively homogenous, as the thaw continues later in the summer, Corethron pennatum becomes the dominant diatom species, resulting in the formation of light laminae characterized by low IPSO25 concentrations. Since C. pennatum can migrate vertically through the water column to uptake nutrients and avoid competition in oligotrophic waters, its high concentration likely reflects stratified and ice-free surface waters typical of late summer. Down-core trends show that the correlation between sediment brightness and geochemical fingerprint (i.e., IPSO25 and δ13C) holds throughout the record. Based on the knowledge gained at lamina level, our down-core high-resolution reconstruction shows that the summer fast ... |
author2 |
Tesi, T. Belt, S. T. Gariboldi, K. Muschitiello, F. Smik, L. Finocchiaro, F. Giglio, F. Colizza, E. Gazzurra, G. Giordano, P. Morigi, C. Capotondi, L. Nogarotto, A. Koseoglu, D. Di Roberto, A. Gallerani, A. Langone, L. |
format |
Article in Journal/Newspaper |
author |
Tesi T. Belt S. T. Gariboldi K. Muschitiello F. Smik L. Finocchiaro F. Giglio F. Colizza E. Gazzurra G. Giordano P. Morigi C. Capotondi L. Nogarotto A. Koseoglu D. Di Roberto A. Gallerani A. Langone L. |
author_facet |
Tesi T. Belt S. T. Gariboldi K. Muschitiello F. Smik L. Finocchiaro F. Giglio F. Colizza E. Gazzurra G. Giordano P. Morigi C. Capotondi L. Nogarotto A. Koseoglu D. Di Roberto A. Gallerani A. Langone L. |
author_sort |
Tesi T. |
title |
Resolving sea ice dynamics in the north-western Ross Sea during the last 2.6 ka: From seasonal to millennial timescales |
title_short |
Resolving sea ice dynamics in the north-western Ross Sea during the last 2.6 ka: From seasonal to millennial timescales |
title_full |
Resolving sea ice dynamics in the north-western Ross Sea during the last 2.6 ka: From seasonal to millennial timescales |
title_fullStr |
Resolving sea ice dynamics in the north-western Ross Sea during the last 2.6 ka: From seasonal to millennial timescales |
title_full_unstemmed |
Resolving sea ice dynamics in the north-western Ross Sea during the last 2.6 ka: From seasonal to millennial timescales |
title_sort |
resolving sea ice dynamics in the north-western ross sea during the last 2.6 ka: from seasonal to millennial timescales |
publishDate |
2020 |
url |
http://hdl.handle.net/11368/2965213 https://doi.org/10.1016/j.quascirev.2020.106299 https://www.sciencedirect.com/science/article/pii/S0277379120302614 |
long_lat |
ENVELOPE(-67.133,-67.133,-68.217,-68.217) ENVELOPE(170.083,170.083,-72.333,-72.333) |
geographic |
Edisto Edisto Inlet Ross Sea |
geographic_facet |
Edisto Edisto Inlet Ross Sea |
genre |
Ross Sea Sea ice |
genre_facet |
Ross Sea Sea ice |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000533150700011 volume:237 firstpage:106299 lastpage:"-" numberofpages:16 journal:QUATERNARY SCIENCE REVIEWS http://hdl.handle.net/11368/2965213 doi:10.1016/j.quascirev.2020.106299 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85083550633 https://www.sciencedirect.com/science/article/pii/S0277379120302614 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.quascirev.2020.106299 |
container_title |
Quaternary Science Reviews |
container_volume |
237 |
container_start_page |
106299 |
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1766179642201341952 |