Antarctic sea-ice microbial communities show distinct patterns of zonation in response to algal-derived substrates

2014 ◽  
Vol 73 (2) ◽  
pp. 123-134 ◽  
Author(s):  
ROM Cowie ◽  
GJ Williams ◽  
EW Maas ◽  
KM Voyles ◽  
KG Ryan
Keyword(s):  
Sea Ice ◽  
Microbial Communities ◽  
Antarctic Sea Ice

scholarly journals In situ expression of eukaryotic ice-binding proteins in microbial communities of Arctic and Antarctic sea ice

2015 ◽  
Vol 9 (11) ◽  
pp. 2537-2540 ◽  
Author(s):  
Christiane Uhlig ◽  
Fabian Kilpert ◽  
Stephan Frickenhaus ◽  
Jessica U Kegel ◽  
Andreas Krell ◽  
...  
Keyword(s):  
Sea Ice ◽  
Microbial Communities ◽  
Binding Proteins ◽  
Antarctic Sea Ice ◽  
Ice Binding

scholarly journals Effect of melting Antarctic sea ice on the fate of microbial communities studied in microcosms

Polar Biology ◽  
2013 ◽  
Vol 36 (10) ◽  
pp. 1483-1497 ◽  
Author(s):  
D. Lannuzel ◽  
V. Schoemann ◽  
I. Dumont ◽  
M. Content ◽  
J. de Jong ◽  
...  
Keyword(s):  
Sea Ice ◽  
Microbial Communities ◽  
Antarctic Sea Ice

High single-cell metabolic activity in Antarctic sea ice bacteria

2008 ◽  
Author(s):  
A Martin ◽  
JA Hall ◽  
R O’Toole ◽  
SK Davy ◽  
KG Ryan
Keyword(s):  
Sea Ice ◽  
Single Cell ◽  
Metabolic Activity ◽  
Cell Metabolic Activity ◽  
Antarctic Sea Ice

scholarly journals Salinity effects on cultured Neogloboquadrina pachyderma (sinistral) from high latitudes: new paleoenvironmental insights

2021 ◽  
Vol 41 (1) ◽  
Author(s):  
Jacqueline Bertlich ◽  
Nikolaus Gussone ◽  
Jasper Berndt ◽  
Heinrich F. Arlinghaus ◽  
Gerhard S. Dieckmann
Keyword(s):  
Sea Ice ◽  
Cold Water ◽  
Weddell Sea ◽  
Wall Thickening ◽  
High Latitudes ◽  
Neogloboquadrina Pachyderma ◽  
Antarctic Sea Ice ◽  
The Antarctic ◽  
Water Species ◽  
Cold Water Species

AbstractThis study presents culture experiments of the cold water species Neogloboquadrina pachyderma (sinistral) and provides new insights into the incorporation of elements in foraminiferal calcite of common and newly established proxies for paleoenvironmental applications (shell Mg/Ca, Sr/Ca and Na/Ca). Specimens were collected from sea ice during the austral winter in the Antarctic Weddell Sea and subsequently cultured at different salinities and a constant temperature. Incorporation of the fluorescent dye calcein showed new chamber formation in the culture at salinities of 30, 31, and 69. Cultured foraminifers at salinities of 46 to 83 only revealed chamber wall thickening, indicated by the fluorescence of the whole shell. Signs of reproduction and the associated gametogenic calcite were not observed in any of the culture experiments. Trace element analyses were performed using an electron microprobe, which revealed increased shell Mg/Ca, Sr/Ca, and Na/Ca values at higher salinities, with Mg/Ca showing the lowest sensitivity to salinity changes. This study enhances the knowledge about unusually high element concentrations in foraminifera shells from high latitudes. Neogloboquadrina pachyderma appears to be able to calcify in the Antarctic sea ice within brine channels, which have low temperatures and exceptionally high salinities due to ongoing sea ice formation.

scholarly journals DASSO: a data assimilation system for the Southern Ocean that utilizes both sea-ice concentration and thickness observations

2021 ◽  
pp. 1-6
Author(s):  
Hao Luo ◽  
Qinghua Yang ◽  
Longjiang Mu ◽  
Xiangshan Tian-Kunze ◽  
Lars Nerger ◽  
...  
Keyword(s):  
Data Assimilation ◽  
Southern Ocean ◽  
Sea Ice ◽  
Coupled Model ◽  
Sea Ice Concentration ◽  
Model Free ◽  
Antarctic Sea Ice ◽  
Ice Concentration ◽  
Data Assimilation System ◽  
Assimilation System

Abstract To improve Antarctic sea-ice simulations and estimations, an ensemble-based Data Assimilation System for the Southern Ocean (DASSO) was developed based on a regional sea ice–ocean coupled model, which assimilates sea-ice thickness (SIT) together with sea-ice concentration (SIC) derived from satellites. To validate the performance of DASSO, experiments were conducted from 15 April to 14 October 2016. Generally, assimilating SIC and SIT can suppress the overestimation of sea ice in the model-free run. Besides considering uncertainties in the operational atmospheric forcing data, a covariance inflation procedure in data assimilation further improves the simulation of Antarctic sea ice, especially SIT. The results demonstrate the effectiveness of assimilating sea-ice observations in reconstructing the state of Antarctic sea ice, but also highlight the necessity of more reasonable error estimation for the background as well as the observation.

Multi-decadal trends in Antarctic sea-ice extent driven by ENSO–SAM over the last 2,000 years

2021 ◽  
Vol 14 (3) ◽  
pp. 156-160
Author(s):  
Xavier Crosta ◽  
Johan Etourneau ◽  
Lisa C. Orme ◽  
Quentin Dalaiden ◽  
Philippine Campagne ◽  
...  
Keyword(s):  
Sea Ice ◽  
Sea Ice Extent ◽  
Antarctic Sea Ice

scholarly journals Dark metabolism: a molecular insight into how the Antarctic sea‐ice diatom Fragilariopsis cylindrus survives long‐term darkness

2019 ◽  
Vol 223 (2) ◽  
pp. 675-691 ◽  
Author(s):  
Fraser Kennedy ◽  
Andrew Martin ◽  
John P. Bowman ◽  
Richard Wilson ◽  
Andrew McMinn
Keyword(s):  
Sea Ice ◽  
Antarctic Sea Ice ◽  
Fragilariopsis Cylindrus ◽  
Dark Metabolism ◽  
The Antarctic ◽  
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