Benthic foraminifera as tracers of brine production in the Storfjorden "sea ice factory"
The rapid response of benthic foraminifera to environmental factors (e.g. organic matter quality and quantity, salinity, pH) and their high fossilisation potential make them promising bio-indicators for the intensity and recurrence of brine formation in Arctic seas. Such an approach, however, requir...
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Online Access: | http://hdl.handle.net/11584/297353 https://doi.org/10.5194/bg-17-1933-2020 |
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ftunicagliariris:oai:iris.unica.it:11584/297353 2024-04-21T08:02:09+00:00 Benthic foraminifera as tracers of brine production in the Storfjorden "sea ice factory" Fossile E. Pia Nardelli M. Jouini A. Lansard B. Pusceddu A. Moccia D. Michel E. Peron O. Howa H. Mojtahid M. Fossile, E. Pia Nardelli, M. Jouini, A. Lansard, B. Pusceddu, A. Moccia, D. Michel, E. Peron, O. Howa, H. Mojtahid, M. 2020 http://hdl.handle.net/11584/297353 https://doi.org/10.5194/bg-17-1933-2020 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000526031400001 volume:17 issue:7 firstpage:1933 lastpage:1953 numberofpages:21 journal:BIOGEOSCIENCES http://hdl.handle.net/11584/297353 doi:10.5194/bg-17-1933-2020 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85083397725 info:eu-repo/semantics/openAccess Organic matter Benthic foraminifera Brine Fossilization Glacier Sea ice info:eu-repo/semantics/article 2020 ftunicagliariris https://doi.org/10.5194/bg-17-1933-2020 2024-03-25T16:16:21Z The rapid response of benthic foraminifera to environmental factors (e.g. organic matter quality and quantity, salinity, pH) and their high fossilisation potential make them promising bio-indicators for the intensity and recurrence of brine formation in Arctic seas. Such an approach, however, requires a thorough knowledge of their modern ecology in such extreme settings. To this aim, seven stations along a north-south transect across the Storfjorden (Svalbard archipelago) have been sampled using an interface multicorer. This fjord is an area of intense sea ice formation characterised by the production of brine-enriched shelf waters (BSW) as a result of a recurrent latent-heat polynya. Living (rose bengal-stained) foraminiferal assemblages were analysed together with geochemical and sedimentological parameters in the top 5 cm of the sediment. Three major biozones were distinguished. (i) The inner fjord zone, dominated by typical glacier proximal calcareous species, which opportunistically respond to fresh organic matter inputs. (ii) The deep basins and sill zone, characterised by glacier distal agglutinated fauna; these are either dominant because of the mostly refractory nature of organic matter and/or the brine persistence that hampers the growth of calcareous species and/or causes their dissolution. (iii) The outer fjord zone, characterised by typical North Atlantic species due to the intrusion of the North Atlantic water in the Storfjordrenna. The stressful conditions present in the deep basins and sill (i.e. acidic waters and low food quality) result in a high agglutinated = calcareous ratio (A=C). This supports the potential use of the A=C ratio as a proxy for brine persistence and overflow in Storfjorden. Article in Journal/Newspaper Foraminifera* glacier North Atlantic Sea ice Storfjorden Storfjordrenna Svalbard Università degli Studi di Cagliari: UNICA IRIS Biogeosciences 17 7 1933 1953 |
institution |
Open Polar |
collection |
Università degli Studi di Cagliari: UNICA IRIS |
op_collection_id |
ftunicagliariris |
language |
English |
topic |
Organic matter Benthic foraminifera Brine Fossilization Glacier Sea ice |
spellingShingle |
Organic matter Benthic foraminifera Brine Fossilization Glacier Sea ice Fossile E. Pia Nardelli M. Jouini A. Lansard B. Pusceddu A. Moccia D. Michel E. Peron O. Howa H. Mojtahid M. Benthic foraminifera as tracers of brine production in the Storfjorden "sea ice factory" |
topic_facet |
Organic matter Benthic foraminifera Brine Fossilization Glacier Sea ice |
description |
The rapid response of benthic foraminifera to environmental factors (e.g. organic matter quality and quantity, salinity, pH) and their high fossilisation potential make them promising bio-indicators for the intensity and recurrence of brine formation in Arctic seas. Such an approach, however, requires a thorough knowledge of their modern ecology in such extreme settings. To this aim, seven stations along a north-south transect across the Storfjorden (Svalbard archipelago) have been sampled using an interface multicorer. This fjord is an area of intense sea ice formation characterised by the production of brine-enriched shelf waters (BSW) as a result of a recurrent latent-heat polynya. Living (rose bengal-stained) foraminiferal assemblages were analysed together with geochemical and sedimentological parameters in the top 5 cm of the sediment. Three major biozones were distinguished. (i) The inner fjord zone, dominated by typical glacier proximal calcareous species, which opportunistically respond to fresh organic matter inputs. (ii) The deep basins and sill zone, characterised by glacier distal agglutinated fauna; these are either dominant because of the mostly refractory nature of organic matter and/or the brine persistence that hampers the growth of calcareous species and/or causes their dissolution. (iii) The outer fjord zone, characterised by typical North Atlantic species due to the intrusion of the North Atlantic water in the Storfjordrenna. The stressful conditions present in the deep basins and sill (i.e. acidic waters and low food quality) result in a high agglutinated = calcareous ratio (A=C). This supports the potential use of the A=C ratio as a proxy for brine persistence and overflow in Storfjorden. |
author2 |
Fossile, E. Pia Nardelli, M. Jouini, A. Lansard, B. Pusceddu, A. Moccia, D. Michel, E. Peron, O. Howa, H. Mojtahid, M. |
format |
Article in Journal/Newspaper |
author |
Fossile E. Pia Nardelli M. Jouini A. Lansard B. Pusceddu A. Moccia D. Michel E. Peron O. Howa H. Mojtahid M. |
author_facet |
Fossile E. Pia Nardelli M. Jouini A. Lansard B. Pusceddu A. Moccia D. Michel E. Peron O. Howa H. Mojtahid M. |
author_sort |
Fossile E. |
title |
Benthic foraminifera as tracers of brine production in the Storfjorden "sea ice factory" |
title_short |
Benthic foraminifera as tracers of brine production in the Storfjorden "sea ice factory" |
title_full |
Benthic foraminifera as tracers of brine production in the Storfjorden "sea ice factory" |
title_fullStr |
Benthic foraminifera as tracers of brine production in the Storfjorden "sea ice factory" |
title_full_unstemmed |
Benthic foraminifera as tracers of brine production in the Storfjorden "sea ice factory" |
title_sort |
benthic foraminifera as tracers of brine production in the storfjorden "sea ice factory" |
publishDate |
2020 |
url |
http://hdl.handle.net/11584/297353 https://doi.org/10.5194/bg-17-1933-2020 |
genre |
Foraminifera* glacier North Atlantic Sea ice Storfjorden Storfjordrenna Svalbard |
genre_facet |
Foraminifera* glacier North Atlantic Sea ice Storfjorden Storfjordrenna Svalbard |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000526031400001 volume:17 issue:7 firstpage:1933 lastpage:1953 numberofpages:21 journal:BIOGEOSCIENCES http://hdl.handle.net/11584/297353 doi:10.5194/bg-17-1933-2020 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85083397725 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-17-1933-2020 |
container_title |
Biogeosciences |
container_volume |
17 |
container_issue |
7 |
container_start_page |
1933 |
op_container_end_page |
1953 |
_version_ |
1796942356403978240 |