Physical and biological properties of Antarctic winter sea ice: Ross Sea vs Weddell Sea
Physical and biogeochemical properties of Antarctic winter pack ice are typically under-sampled. Here, we present the results of physical and biological investigations on early-winter pack ice in the Ross Sea (April–June 2017). Ice textures, temperature, bulk salinity, brine volume, brine salinity a...
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ftorbi:oai:orbi.ulg.ac.be:2268/244467 2024-04-21T07:52:29+00:00 Physical and biological properties of Antarctic winter sea ice: Ross Sea vs Weddell Sea Tison, J.-L. Maksym, T. Ackley, S. Stammerjoohn, S. Wauthy, S. Van der Linden, Fanny Carnat, G. Sapart, J. de Jong, J. Delille, Bruno FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège 2019-08-19 https://orbi.uliege.be/handle/2268/244467 en eng https://orbi.uliege.be/handle/2268/244467 info:hdl:2268/244467 International Symposium on Sea ice at the Interface, Winnipeg, Canada [CA], 18-23 August 2019 Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique conference paper not in proceedings http://purl.org/coar/resource_type/c_18cp info:eu-repo/semantics/conferencePaper 2019 ftorbi 2024-03-27T14:50:20Z Physical and biogeochemical properties of Antarctic winter pack ice are typically under-sampled. Here, we present the results of physical and biological investigations on early-winter pack ice in the Ross Sea (April–June 2017). Ice textures, temperature, bulk salinity, brine volume, brine salinity and Rayleigh number help us characterize the physical environment in which biological activity will be able to develop in early winter, with contrasted behavior between polynyas, the marginal ice zone (MIZ) and the central Ross Sea. As expected, the very dynamic Terra Nova Bay polynya and the MIZ are dominated by granular ice, while columnar ice takes over the central Ross Sea, with decreasing proportions as one progresses north from the Ross Sea polynya. Snow is present in negligible amounts (a few centimeters) almost everywhere, except in the northern section of the central Ross Sea (10–20 cm), which has a longer and more spatially extended growth history, as shown by satellite imagery. The latter also clearly shows that the southern section has a much shorter growth history, due to a very late ice-growth onset, a remarkable feature of year 2017. The result is a globally low chl-a standing stock, as compared to previous Ross Sea winter cruises (1995–98). The Terra Nova Bay polynya, the MIZ and the southern central Ross Sea show low internal chl-a (≤1 μg L–1). A bottom community, however, develops with time and ice growth, showing higher chl-a concentrations, both from the outer skirt of the Terra Nova Bay polynya northward, and from the MIZ southwards. The highest chl-a levels (>30 μg L–1) are found in rafted coastal floes within the transition zone to the central Ross Sea. Finally, the northern central Ross Sea floes, with a longer growth history and thicker ice cover, show an increase in the internal community chl-a, potentially triggered by brine-tube development. A recent update on the biogeochemical impact of snow cover and cyclonic intrusions on the winter pack ice in the Weddell Sea has shown that winter ... Conference Object Antarc* Antarctic Ross Sea Sea ice Weddell Sea University of Liège: ORBi (Open Repository and Bibliography) |
institution |
Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
op_collection_id |
ftorbi |
language |
English |
topic |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
spellingShingle |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique Tison, J.-L. Maksym, T. Ackley, S. Stammerjoohn, S. Wauthy, S. Van der Linden, Fanny Carnat, G. Sapart, J. de Jong, J. Delille, Bruno Physical and biological properties of Antarctic winter sea ice: Ross Sea vs Weddell Sea |
topic_facet |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
description |
Physical and biogeochemical properties of Antarctic winter pack ice are typically under-sampled. Here, we present the results of physical and biological investigations on early-winter pack ice in the Ross Sea (April–June 2017). Ice textures, temperature, bulk salinity, brine volume, brine salinity and Rayleigh number help us characterize the physical environment in which biological activity will be able to develop in early winter, with contrasted behavior between polynyas, the marginal ice zone (MIZ) and the central Ross Sea. As expected, the very dynamic Terra Nova Bay polynya and the MIZ are dominated by granular ice, while columnar ice takes over the central Ross Sea, with decreasing proportions as one progresses north from the Ross Sea polynya. Snow is present in negligible amounts (a few centimeters) almost everywhere, except in the northern section of the central Ross Sea (10–20 cm), which has a longer and more spatially extended growth history, as shown by satellite imagery. The latter also clearly shows that the southern section has a much shorter growth history, due to a very late ice-growth onset, a remarkable feature of year 2017. The result is a globally low chl-a standing stock, as compared to previous Ross Sea winter cruises (1995–98). The Terra Nova Bay polynya, the MIZ and the southern central Ross Sea show low internal chl-a (≤1 μg L–1). A bottom community, however, develops with time and ice growth, showing higher chl-a concentrations, both from the outer skirt of the Terra Nova Bay polynya northward, and from the MIZ southwards. The highest chl-a levels (>30 μg L–1) are found in rafted coastal floes within the transition zone to the central Ross Sea. Finally, the northern central Ross Sea floes, with a longer growth history and thicker ice cover, show an increase in the internal community chl-a, potentially triggered by brine-tube development. A recent update on the biogeochemical impact of snow cover and cyclonic intrusions on the winter pack ice in the Weddell Sea has shown that winter ... |
author2 |
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège |
format |
Conference Object |
author |
Tison, J.-L. Maksym, T. Ackley, S. Stammerjoohn, S. Wauthy, S. Van der Linden, Fanny Carnat, G. Sapart, J. de Jong, J. Delille, Bruno |
author_facet |
Tison, J.-L. Maksym, T. Ackley, S. Stammerjoohn, S. Wauthy, S. Van der Linden, Fanny Carnat, G. Sapart, J. de Jong, J. Delille, Bruno |
author_sort |
Tison, J.-L. |
title |
Physical and biological properties of Antarctic winter sea ice: Ross Sea vs Weddell Sea |
title_short |
Physical and biological properties of Antarctic winter sea ice: Ross Sea vs Weddell Sea |
title_full |
Physical and biological properties of Antarctic winter sea ice: Ross Sea vs Weddell Sea |
title_fullStr |
Physical and biological properties of Antarctic winter sea ice: Ross Sea vs Weddell Sea |
title_full_unstemmed |
Physical and biological properties of Antarctic winter sea ice: Ross Sea vs Weddell Sea |
title_sort |
physical and biological properties of antarctic winter sea ice: ross sea vs weddell sea |
publishDate |
2019 |
url |
https://orbi.uliege.be/handle/2268/244467 |
genre |
Antarc* Antarctic Ross Sea Sea ice Weddell Sea |
genre_facet |
Antarc* Antarctic Ross Sea Sea ice Weddell Sea |
op_source |
International Symposium on Sea ice at the Interface, Winnipeg, Canada [CA], 18-23 August 2019 |
op_relation |
https://orbi.uliege.be/handle/2268/244467 info:hdl:2268/244467 |
_version_ |
1796935716623613952 |