Articles | Volume 42, issue 2
https://doi.org/10.5194/jm-42-95-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/jm-42-95-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
13 Sep 2023
Research article |
| 13 Sep 2023
| 13 Sep 2023
Paleoenvironmental changes related to the variations of the sea-ice cover during the Late Holocene in an Antarctic fjord (Edisto Inlet, Ross Sea) inferred by foraminiferal association
Dipartimento di Scienze Ambientali, Informatica e statistica, Università Ca' Foscari Venezia, Via Torino 155,
30172, Venice, Italy
Dipartimento di Scienze della Terra, Università di Pisa, Via Santa
Maria, 53, 56126, Pisa, Italy
Caterina Morigi
Dipartimento di Scienze della Terra, Università di Pisa, Via Santa
Maria, 53, 56126, Pisa, Italy
Romana Melis
Dipartimento di Matematica e Geoscienze, Università di Trieste, Via E.
Weiss 2, 34127, Trieste, Italy
Alessio Di Roberto
Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione di Pisa,
Via della C, Battisti 53, 56125, Pisa, Italy
Tommaso Tesi
Istituto di Scienze Polari – Consiglio Nazionale delle Ricerche ISP-CNR,
Via P. Gobetti 101, 40129, Bologna, Italy
Fiorenza Torricella
Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS),
Borgo Grotta Gigante 42/c, 34010, Sgonico, Trieste, Italy
Leonardo Langone
Istituto di Scienze Polari – Consiglio Nazionale delle Ricerche ISP-CNR,
Via P. Gobetti 101, 40129, Bologna, Italy
Patrizia Giordano
Istituto di Scienze Polari – Consiglio Nazionale delle Ricerche ISP-CNR,
Via P. Gobetti 101, 40129, Bologna, Italy
Ester Colizza
Dipartimento di Matematica e Geoscienze, Università di Trieste, Via E.
Weiss 2, 34127, Trieste, Italy
Lucilla Capotondi
Istituto di Scienze Marine – Consiglio Nazionale delle Ricerche ISMAR-CNR,
Via P. Gobetti 101, 40129, Bologna, Italy
Andrea Gallerani
Istituto di Scienze Marine – Consiglio Nazionale delle Ricerche ISMAR-CNR,
Via P. Gobetti 101, 40129, Bologna, Italy
Karen Gariboldi
Dipartimento di Scienze Ambientali, Informatica e statistica, Università Ca' Foscari Venezia, Via Torino 155,
30172, Venice, Italy
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We examine benthic foraminiferal communities along an inner-to-outer transect in a fjord of Victoria Land. Community structure reflects organic matter flux, sedimentation rates, and circulation regimes. Inner sites show signs of stress, likely tied to oxygen depletion after sea-ice break up. Outer sites have higher densities, suggesting improved conditions. Comparison between paleocommunities and modern assemblages shows that communities are still recovering from late Holocene changes.
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In the Edisto Inlet, Ross Sea, over the last 3.6 kyr, a marked transition at 2.7–2.5 kyr BP occurred. Geochemical proxies and changes in the foraminiferal community suggest a change from multi-year to seasonal sea ice, likely linked to mCDW (modified Circumpolar Deep Water) intrusion. The study integrates ecological information and geochemical data to unveil connections between mCDW, sea-ice conditions and the SAM (Southern Annular Mode) in Edisto, highlighting it as a key site for regional paleoclimate reconstruction over the Ross Sea.
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Short summary
A sediment core was analysed, focusing over the 2000 years, in Edisto Inlet. Benthic and planktic foraminifera were picked and used to determine changes in the faunal composition. Using other nearby cores, by comparing different proxies, we were able to identify a succession of three different environmental phases over the studied period: a seasonal-cycle phase (from 2000 to around 1500 years BP), a transitional phase (from 1500 to 700 years BP) and a cold phase (from 700 years to present).
A sediment core was analysed, focusing over the 2000 years, in Edisto Inlet. Benthic and...
