Phytoplankton dynamics at the ice-edge zone of the Lazarev Sea (Southern Ocean) during the austral summer 1994/1995 drogue study

Polar Biology ◽  
2001 ◽  
Vol 24 (6) ◽  
pp. 422-431 ◽  
Author(s):  
Pakhomov E. ◽  
Ratkova T. ◽  
Froneman P. ◽  
Wassmann P.
Keyword(s):  
Southern Ocean ◽  
Austral Summer ◽  
Phytoplankton Dynamics ◽  
Edge Zone ◽  
Ice Edge

scholarly journals Evaluating seasonal sea-ice cover over the Southern Ocean from the Last Glacial Maximum

2020 ◽  
Author(s):  
Ryan A. Green ◽  
Laurie Menviel ◽  
Katrin J. Meissner ◽  
Xavier Crosta
Keyword(s):  
Southern Ocean ◽  
Sea Ice ◽  
Last Glacial Maximum ◽  
Austral Summer ◽  
Ice Cover ◽  
Proxy Records ◽  
Ice Edge ◽  
Sea Ice Edge ◽  
The Last Glacial Maximum ◽  
The Last Glacial

Abstract. Sea-ice cover over the Southern Ocean responds to and impacts Southern Ocean dynamics and, thus, mid to high latitude climate in the Southern Hemisphere. In addition, sea-ice cover can significantly modulate the carbon exchange between the atmosphere and the ocean. As climate models are the only tool available to project future climate changes, it is important to assess their performance in simulating past changes. The Last Glacial Maximum (LGM, ∼21,000 years ago) represents an interesting target as it is a relatively well documented period with climatic conditions and a carbon cycle very different from pre-industrial conditions. Here, we study the changes in seasonal Antarctic sea-ice cover as simulated in numerical PMIP3 and LOVECLIM simulations of the LGM, and their relationship with windstress and ocean temperature. Simulations and paleo-proxy records suggest a fairly well constrained glacial winter sea-ice edge at 51.5° S (1 sigma range: 50°–55.5° S). Simulated glacial summer sea-ice cover however differs widely between models, ranging from almost no sea ice to a sea-ice edge reaching 55.5° S. The austral summer multi-model mean sea-ice edge lies at ∼60.5° S (1 sigma range: 57.5°–70.5° S). Given the lack of strong constraints on the summer sea-ice edge based on sea-ice proxy records, we extend our model-data comparison to summer sea-surface temperature. Our analysis suggests that the multi-model mean summer sea ice provides a reasonable, albeit upper end, estimate of the austral summer sea-ice edge allowing us to conclude that the multi-model mean of austral summer and winter sea-ice cover seem to provide good estimates of LGM conditions. Using these best estimates, we find that there was a larger sea-ice seasonality during the LGM compared to the present day.

scholarly journals Euphausiid community structure and population structure of Euphausia superba off Adélie Land in the Southern Ocean during austral summer 2003, 2005 and 2008

Polar Science ◽  
2011 ◽  
Vol 5 (2) ◽  
pp. 146-165 ◽  
Author(s):  
Atsushi Ono ◽  
Masato Moteki ◽  
Kazuo Amakasu ◽  
Ryoji Toda ◽  
Naho Horimoto ◽  
...  
Keyword(s):  
Population Structure ◽  
Community Structure ◽  
Southern Ocean ◽  
Austral Summer ◽  
Euphausia Superba

Distribution and abundance of choanoflagellates (Acanthoecidae) across the ice-edge zone in the Weddell Sea, Antarctica

1988 ◽  
Vol 98 (2) ◽  
pp. 263-269 ◽  
Author(s):  
K. R. Buck ◽  
D. L. Garrison
Keyword(s):  
Weddell Sea ◽  
Edge Zone ◽  
Ice Edge

Fronts, water masses and heat content variability in the Western Indian sector of the Southern Ocean during austral summer 2004

2006 ◽  
Vol 63 (1-2) ◽  
pp. 20-34 ◽  
Author(s):  
N. Anilkumar ◽  
Alvarinho J. Luis ◽  
Y.K. Somayajulu ◽  
V. Ramesh Babu ◽  
M.K. Dash ◽  
...  
Keyword(s):  
Southern Ocean ◽  
Heat Content ◽  
Austral Summer ◽  
Water Masses ◽  
Indian Sector

Protozooplankton in the Weddell Sea, Antarctica: Abundance and distribution in the ice-edge zone

Polar Biology ◽  
1989 ◽  
Vol 9 (6) ◽  
pp. 341-351 ◽  
Author(s):  
David L. Garrison ◽  
Kurt R. Buck
Keyword(s):  
Weddell Sea ◽  
Edge Zone ◽  
Ice Edge ◽  
Abundance And Distribution

scholarly journals The effect of marginal ice-edge dynamics on production and export in the Southern Ocean along 170°W

2003 ◽  
Vol 50 (3-4) ◽  
pp. 579-603 ◽  
Author(s):  
Ken O Buesseler ◽  
Richard T Barber ◽  
Mary-Lynn Dickson ◽  
Michael R Hiscock ◽  
Jefferson Keith Moore ◽  
...  
Keyword(s):  
Southern Ocean ◽  
Ice Edge

scholarly journals CCN measurements at the Princess Elisabeth Antarctica Research Station during three austral summers

2018 ◽  
Author(s):  
Paul Herenz ◽  
Heike Wex ◽  
Alexander Mangold ◽  
Quentin Laffineur ◽  
Irina V. Gorodestkaya ◽  
...  
Keyword(s):  
Southern Ocean ◽  
Aerosol Particle ◽  
Aerosol Particles ◽  
Source Region ◽  
Austral Summer ◽  
Research Station ◽  
Air Masses ◽  
Potential Source ◽  
The Antarctic ◽  
Aitken Mode

Abstract. For three austral summer seasons (2013–2016, each from December to February) aerosol particles arriving at the Belgian Antarctic research station Princess Elisabeth (PE), in Dronning Maud Land in East Antarctica were characterized in terms of number concentrations of total aerosol particles (NCN) and cloud condensation nuclei (NCCN), the particle number size distribution (PNSD), the aerosol particle hygroscopicity and the influence of the air mass origin on NCN and NCCN. In general NCN was found to range from 40 to 6700 cm−3 with a median of 333 cm−3, while NCCN was found to cover a range between less than 10 and 1300 cm−3 for supersaturations (SS) between 0.1 and 0.7 %. It is shown that the aerosol is Aitken mode dominated and is characterized by a significant amount of freshly, secondarily formed aerosol particles, with 94 % and 36 % of the aerosol particles are smaller than 90 nm and ≈ 35 nm, respectively. Measurements of the basic meteorological parameters as well as the history of the air masses arriving at the measurement station indicate that the station is influenced by both, continental air masses originating from the Antarctic inland ice sheet (continental events – CE) and marine air masses originating from the Southern Ocean (marine events – ME). CEs came along with rather constant NCN and NCCN values, which we denote to be Antarctic continental background concentrations. MEs however cause large fluctuations in NCN and NCCN caused by scavenging due to precipitation or new particle formation based on marine precursors. The application of Hysplit back trajectories in form of the potential source contribution function (PSCF) analysis indicate, that the region of the Southern Ocean is a potential source of Aitken mode particles. For particles larger than ≈ 110 nm (CCN measured at SS of 0.1 %) the Antarctic ice shelf regions were found to be a potential source region, most likely due to the emission of sea salt aerosol particles, released from snow particles from surface snow layers by sublimation, e.g., during periods of high wind speed, leading to drifting or blowing snow. On the basis of the PNSDs and NCCN, the critical diameter for cloud droplet activation and the aerosol particle hygroscopicity parameter κ were determined to be 110 nm and 1, respectively, for a SS of 0.1 %. The region of the Antarctic inland plateau however was not found to feature a significant source region for CN and CCN measured at the PE station in austral summer.

Meridional variations in N* and Si* along 57°30′E and 47°E transects in the indian sector of the Southern Ocean during austral summer 2011

2020 ◽  
Vol 178 ◽  
pp. 104846 ◽  
Author(s):  
Bhaskar V. Parli ◽  
Deepti R.G. Dessai ◽  
N. Anilkumar ◽  
Racheal Chacko ◽  
Sini Pavithran
Keyword(s):  
Southern Ocean ◽  
Austral Summer ◽  
Indian Sector
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