Bryozoans of the Weddell Sea continental shelf, slope and abyss: did marine life colonize the Antarctic shelf from deep water, outlying islands or in situ refugia following glaciations?

2010 ◽  
Vol 37 (9) ◽  
pp. 1648-1656 ◽  
Author(s):  
David K. A. Barnes ◽  
Piotr Kuklinski
Keyword(s):  
Continental Shelf ◽  
Deep Water ◽  
Weddell Sea ◽  
Marine Life ◽  
Shelf Slope ◽  
Antarctic Shelf ◽  
Continental Shelf Slope ◽  
The Antarctic

Two new species of the genus Austroniscus Vanhoeffen, 1914 (Isopoda: Asellota: Nannoniscidae) from the Antarctic shelf

Zootaxa ◽  
2007 ◽  
Vol 1394 (1) ◽  
pp. 47-68 ◽  
Author(s):  
STEFANIE KAISER ◽  
ANGELIKA BRANDT
Keyword(s):  
New Species ◽  
Continental Shelf ◽  
First Record ◽  
Weddell Sea ◽  
Two New Species ◽  
Antarctic Shelf ◽  
The Antarctic ◽  
Eastern Weddell Sea

During the BENDEX expedition (BENthic Disturbance-EXperiment) with RV Polarstern in Antarctic summer 2003/04, species of the genus Austroniscus Vanhoeffen, 1914 were sampled from the continental shelf of the eastern Weddell Sea. Besides Austroniscus ovalis Vanhoeffen, 1914, which is the first record of this species from western Antarctica, two other species were found, i.e. Austroniscus chelus sp. nov. and Austroniscus obscurus sp. nov. They both bear many resemblances to Austroniscus ovalis, but can be easily distinguished from A. ovalis by the shape of the rostral crest and the first pereonite. The two new species are very similar to each other but differ in the number of articles of the antennula and the shape of pleopods 3 to 5.

Two new species of the genus Austroniscus Vanhoeffen, 1914 (Isopoda: Asellota: Nannoniscidae) from the Antarctic shelf

Zootaxa ◽  
2007 ◽  
Vol 1394 (1) ◽  
pp. 47 ◽  
Author(s):  
STEFANIE KAISER ◽  
ANGELIKA BRANDT
Keyword(s):  
New Species ◽  
Continental Shelf ◽  
First Record ◽  
Weddell Sea ◽  
Two New Species ◽  
Antarctic Shelf ◽  
The Antarctic ◽  
Eastern Weddell Sea

During the BENDEX expedition (BENthic Disturbance-EXperiment) with RV Polarstern in Antarctic summer 2003/04, species of the genus Austroniscus Vanhoeffen, 1914 were sampled from the continental shelf of the eastern Weddell Sea. Besides Austroniscus ovalis Vanhoeffen, 1914, which is the first record of this species from western Antarctica, two other species were found, i.e. Austroniscus chelus sp. nov. and Austroniscus obscurus sp. nov. They both bear many resemblances to Austroniscus ovalis, but can be easily distinguished from A. ovalis by the shape of the rostral crest and the first pereonite. The two new species are very similar to each other but differ in the number of articles of the antennula and the shape of pleopods 3 to 5.

scholarly journals M2 tidal dynamics in the Ross Sea

2003 ◽  
Vol 15 (1) ◽  
pp. 41-46 ◽  
Author(s):  
ROBIN ROBERTSON ◽  
AIKE BECKMANN ◽  
HARTMUT HELLMER
Keyword(s):  
Continental Shelf ◽  
Ross Sea ◽  
Tidal Energy ◽  
Ocean Model ◽  
Internal Tides ◽  
Global Ocean ◽  
Tidal Dynamics ◽  
Tidal Elevation ◽  
Shelf Slope ◽  
Continental Shelf Slope

In certain regions of the Southern Ocean, tidal energy is believed to foster the mixing of different water masses, which eventually contribute to the formation of deep and bottom waters. The Ross Sea is one of the major ventilation sites of the global ocean abyss and a region of sparse tidal observations. We investigated M2 tidal dynamics in the Ross Sea using a three-dimensional sigma coordinate model, the Regional Ocean Model System (ROMS). Realistic topography and hydrography from existing observational data were used with a single tidal constituent, the semi-diurnal M2. The model fields faithfully reproduced the major features of the tidal circulation and had reasonable agreement with ten existing tidal elevation observations and forty-two existing tidal current measurements. The differences were attributed primarily to topographic errors. Internal tides were generated at the continental shelf/slope break and other areas of steep topography. Strong vertical shears in the horizontal velocities occurred under and at the edges of the Ross Ice Shelf and along the continental shelf/slope break. Estimates of lead formation based on divergence of baroclinic velocities were significantly higher than those based on barotrophic velocities, reaching over 10% at the continental shelf/slope break.

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