FN Archimer Export Format
PT J
TI Early taphonomy of benthic foraminifera in Storfjorden ‘sea‐ice factory’: the agglutinated/calcareous ratio as a proxy for brine persistence
BT 
AF Nardelli, Maria Pia
   Fossile, Eleonora
   Péron, Olivier
   Howa, Hélène
   Mojtahid, Meryem
AS 1:1;2:1;3:2;4:1;5:1;
FF 1:;2:;3:;4:;5:;
C1 LPG UMR CNRS 6112 Université d’Angers Nantes Université Le Mans Univ 2 bd Lavoisier 49045 Angers CEDEX 01 ,France
   SUBATECH UMR 6457 CNRS‐Université de Nantes 4 rue A. Kastler 44307 Nantes, France
C2 UNIV ANGERS, FRANCE
   UNIV NANTES, FRANCE
IF 2.2
TC 5
UR https://archimer.ifremer.fr/doc/00771/88317/93950.pdf
   https://archimer.ifremer.fr/doc/00771/88317/93951.docx
   https://archimer.ifremer.fr/doc/00771/88317/93952.xlsx
LA English
DT Article
CR STEP 2016
BO L'Atalante
AB The recurrent latent-heat polynya characterizing Storfjorden (Svalbard, Norway) triggers seasonal formation of thin first-year sea ice. This leads to the production of dense, salty, and corrosive brines that cascade towards the sea floor and mix with shelf waters. The bottom topography of the fjord is responsible for the retention of these dense waters in two central deep basins throughout the year. Recent studies show that living benthic foraminifera in Storfjorden are particularly affected by the persistence of brines on the sea floor, with a strong dominance of agglutinated (A) species and high degrees of dissolution of calcareous(C) faunas. Therefore, the A/C ratio, calculated on living faunas, was proposed as a proxy for brine persistence. In the present study we analyse the fossil faunas, found below the taphonomically active zone, to investigate the residual signal of the A/C proxy after the intense early taphonomic processes and challenge its applicability in sedimentary archives. Our results show that despite the generally high taphonomic loss inside the fjord, a high proportion of agglutinated species is still visible in fossil faunas at the stations experiencing regular and/or persistent presence of brine-enriched shelf waters. These results support the application of the A/C ratio in historical records to reconstruct the persistence of brines and indirectly the first-year sea ice formation in Storfjorden. This can be further applied to other Arctic fjords with similar settings and characterized by the production of brines during the winter–early spring season. 
PY 2023
PD JAN
SO Boreas
SN 0300-9483
PU Wiley
VL 52
IS 1
UT 000796281700001
BP 109
EP 123
DI 10.1111/bor.12592
ID 88317
ER

EF