Fluxes and composition of settling particles during summer in an Antarctic shallow bay of Livingston Island, South Shetlands

Polar Biology ◽  
2001 ◽  
Vol 24 (9) ◽  
pp. 670-676 ◽  
Author(s):  
Enrique Isla ◽  
Albert Palanques ◽  
Victor Alvà ◽  
Puig P. ◽  
Guillén J.
Keyword(s):  
Settling Particles ◽  
Livingston Island ◽  
South Shetlands ◽  
Shallow Bay

scholarly journals Evaluation of the ground surface Enthalpy balance from bedrock shallow borehole temperatures (Livingston Island, Maritime Antarctic)

2008 ◽  
Vol 2 (2) ◽  
pp. 153-184
Author(s):  
M. Ramos ◽  
G. Vieira
Keyword(s):  
Methodological Approach ◽  
Ground Surface ◽  
Enthalpy Change ◽  
Ground Temperatures ◽  
Livingston Island ◽  
Hourly Temperature ◽  
South Shetlands ◽  
Borehole Temperatures ◽  
Gains And Losses ◽  
Modelling Approach

Abstract. The annual evolution of the ground temperatures from Incinerador borehole in Livingston Island (South Shetlands, Antarctic) is studied. The borehole is 2.4 m deep and is located in a quartzite outcrop in the proximity of the Spanish Antarctic Station Juan Carlos I. In order to model the movement of the 0°C isotherm (velocity and maximum depth) hourly temperature profiles from: (i) the cooling periods of the frost seasons of 2000 to 2005, and (ii) the warming periods of the thaw seasons of 2002–2003, 2003–2004 and 2004–2005, were studied. In this modelling approach, heat gains and losses across ground surface are considered to be the causes for the 0°C isotherm movement. A methodological approach to calculate the Enthalpy change based on the thermodynamic analysis of the ground during the cooling and warming periods is proposed. The Enthalpy change is equivalent to the heat exchange through the ground surface during each season, thus enabling to describe the interaction ground-atmosphere and providing valuable data for studies on permafrost and periglacial processes. The bedrock density is considered to be constant in the borehole and initial isothermal conditions at 0°C are assumed to run the model. The final stages correspond to the temperatures at the end of the cooling and warming periods (annual minima and maxima).

scholarly journals Transition from a Subaerial to a Subnival Permafrost Temperature Regime Following Increased Snow Cover (Livingston Island, Maritime Antarctic)

Atmosphere ◽  
2020 ◽  
Vol 11 (12) ◽  
pp. 1332
Author(s):  
Miguel Ramos ◽  
Gonçalo Vieira ◽  
Miguel Angel de Pablo ◽  
Antonio Molina ◽  
Juan Javier Jimenez
Keyword(s):  
Active Layer ◽  
Thermal Regime ◽  
Soil Surface ◽  
Snow Accumulation ◽  
Active Layer Thickness ◽  
Subglacial Environment ◽  
Livingston Island ◽  
South Shetlands ◽  
Loss Of Mass ◽  
The Antarctic

The Antarctic Peninsula (AP) region has been one of the regions on Earth with strongest warming since 1950. However, the northwest of the AP showed a cooling from 2000 to 2015, which had local consequences with an increase in snow accumulation and a deceleration in the loss of mass from glaciers. In this paper, we studied the effects of increased snow accumulation in the permafrost thermal regime in two boreholes (PG1 and PG2) in Livingston Island, South Shetlands Archipelago, from 2009 to 2015. The two boreholes located c. 300 m apart but at similar elevation showed different snow accumulation, with PG2 becoming completely covered with snow all year long, while the other remained mostly snow free during the summer. The analysis of the thermal regimes and of the estimated soil surface energy exchange during the study period showed the effects of snow insulation in reducing the active layer thickness. These effects were especially relevant in PG2, which transitioned from a subaerial to a subnival regime. There, permafrost aggraded from below, with the active layer completely disappearing and the efficiency of thermal insulation by the snowpack prevailing in the thermal regime. This situation may be used as an analogue for the transition from a periglacial to a subglacial environment in longer periods of cooling in the paleoenvironmental record.

Heavy Metals in Antarctic Notothenioid Fish from South Bay, Livingston Island, South Shetlands (Antarctica)

2010 ◽  
Vol 141 (1-3) ◽  
pp. 150-158 ◽  
Author(s):  
Michaela Beltcheva ◽  
Roumiana Metcheva ◽  
Vesela Peneva ◽  
Margarita Marinova ◽  
Yordan Yankov ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Notothenioid Fish ◽  
Livingston Island ◽  
South Shetlands

scholarly journals New data on the taxonomic composition of macroinvertebrates in marine habitats from the Livingston Island, Antarctica

2019 ◽  
Vol 2 ◽  
Author(s):  
Lyubomir Kenderov ◽  
Vesela Evtimova ◽  
Plamen Mitov ◽  
Apostol Apostolov ◽  
Eliza Uzunova ◽  
...  
Keyword(s):  
Taxonomic Composition ◽  
South Shetland Islands ◽  
Research Station ◽  
The South ◽  
Sandy Bottom ◽  
Tidal Zone ◽  
Marine Habitats ◽  
Livingston Island ◽  
South Shetlands ◽  
The Antarctic

Antarctic marine organisms are characterised by a significant level of endemism. This is due to geological, climatological and oceanographic reasons, such as the break-up of Antarctida from Gondwana during the Cretaceous; the formation of a circumpolar current; the extremely low water temperatures (close to freezing); the short summer seasons. The South Shetland Islands (West Antarctic Peninsula) are one of 29 known biogeographic areas in the Southern Hemisphere (Griffiths et al. 2009). King George Island is the largest island from the South Shetlands and eight countries have their polar bases there. Marine bottom macroinvertebrates from the surrounding seawaters are very well studied (Siciński et al. 2011). Less research was carried out in the region of the nearby Livingston Island. There are located two polar bases: "St. Kliment Ohridski" (Bulgaria) and "Juan Carlos I" (Spain). We can assume that in the seawaters of the South Bay we can also expect a rich bottom macroinvertebrate fauna because of the similar conditions and the close distance between the two islands. The aim of this study is to present the first Bulgarian results on the taxonomic composition of marine macroinvertebrates from the South Bay, Livingston Island. The samples were collected during the XXVIIth Bulgarian Antarctic Expedition (2018–2019 austral summer). Various sites in four areas were sampled: the coastal zone in front of the Bulgarian Polar Base (Costa Bulgara); a small bay south of Cape Hesperides (Reservnoto port); Johnsons Dock Bay near the Spanish research station and Walker Bay near Hannah Point. Samples were collected mainly through bottom trawling at depths of 2 to 20 meters on different types of bottom substrates using Zodiac boats. A total of 11 macrozoobenthos samples were collected. Our preliminary results show that the main macrozoobenthic species are well known in the seawaters of the South Shetlands and usually they have a circumpolar distribution. At the site with soft muddy bottoms (Johnsons Dock Bay), the corrugated ribbon worm Parborlasia corrugatus (McIntosh, 1876) (order Heteronemertea, class Pilidiophora, phylum Nemertea) as well as ascidians (order Phlebobranchia, class Ascidiacea, phylum Chordata) had the highest biomass. The most abundant in the Johnsons Dock Bay were the Antarctic bivalve Aequiyoldia eightsii (Jay, 1839) (order Nuculanida, class Bivalvia, phylum Mollusca); the scale worm Barrukia cristata (Willey, 1902) and the catworm Aglaophamus trissophyllus (Grube, 1877) (both of order Phyllodocida, class Polychaeta, phyllum Annelida). The seroid isopod Spinoserolis beddardi (Calman, 1920) (order Isopoda, class Malacostraca, phyllum Arthropoda) dominated in the muddy / sandy bottom of Hannah Point. The habitats of the rocky bottom (Costa Bulgara) were inhabited mainly by crustaceans (order Aphipoda, class Malacostraca, phyllum Arthropoda) and gastropods (phylum Mollusca). In the tidal zone of this habitat (0–2m), the predominant species was the Antarctic limplet Nacella concinna (Strebel, 1908) (order Patellogastropoda, class Gastropoda, phylum Mollusca).

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