Seashore sediment and water chemistry at the Admiralty Bay (King George Island, Maritime Antarctica) – Geochemical analysis and correlations between the concentrations of chemical species

2020 ◽  
Vol 152 ◽  
pp. 110888
Author(s):  
Joanna Potapowicz ◽  
Danuta Szumińska ◽  
Małgorzata Szopińska ◽  
Robert Józef Bialik ◽  
Katarzyna Machowiak ◽  
...  
Keyword(s):  
Water Chemistry ◽  
Chemical Species ◽  
Geochemical Analysis ◽  
King George Island ◽  
Maritime Antarctica ◽  
Admiralty Bay

scholarly journals Spatial variability models of CO2 emissions from soils colonized by grass (Deschampsia antarctica) and moss (Sanionia uncinata) in Admiralty Bay, King George Island

2010 ◽  
Vol 23 (1) ◽  
pp. 27-33 ◽  
Author(s):  
Eduardo de Sá Mendonça ◽  
Newton La Scala ◽  
Alan Rodrigo Panosso ◽  
Felipe N.B. Simas ◽  
Carlos E.G.R. Schaefer
Keyword(s):  
Spatial Variability ◽  
Spatial Pattern ◽  
Carbon Cycling ◽  
Vegetation Cover ◽  
Terrestrial Ecosystems ◽  
Deschampsia Antarctica ◽  
King George Island ◽  
Maritime Antarctica ◽  
Admiralty Bay ◽  
Sanionia Uncinata

AbstractSoil CO2 emission is an important part of the terrestrial carbon cycling and is influenced by several factors, such as type and distribution of vegetation. In this work we evaluated the spatial variability of soil CO2 emission in terrestrial ecosystems of maritime Antarctica, under two contrasting vegetation covers: 1) grass areas of Deschampsia antarctica Desv., and 2) moss carpets of Sanionia uncinata (Hedw.) Loeske. Highest mean emission was obtained for the Deschampsia (4.13 μmol m-2 s-1) developed on organic-rich soil with a strong penguin influence. The overall results indicate that soil temperature is not directly related to the spatial pattern of soil CO2 emission at the sites studied. Emission adjusted models were Gaussian and exponential with ranges varying from 1.3 to 2.8 m, depending on the studied site and vegetation cover.

Sediment geochemistry in coastal maritime Antarctica (Admiralty Bay, King George Island): Evidence from rare earths and other elements

2007 ◽  
Vol 107 (4) ◽  
pp. 464-474 ◽  
Author(s):  
Isaac R. Santos ◽  
Déborah I.T. Fávaro ◽  
Carlos E.G.R. Schaefer ◽  
Emmanoel V. Silva-Filho
Keyword(s):  
Rare Earths ◽  
Sediment Geochemistry ◽  
King George Island ◽  
Maritime Antarctica ◽  
Admiralty Bay

Composition and biomass of shallow benthic megafauna during an annual cycle in Admiralty Bay, King George Island, Antarctica

2005 ◽  
Vol 17 (3) ◽  
pp. 312-318 ◽  
Author(s):  
CARLOS ALEJANDRO ECHEVERRÍA ◽  
PAULO CESAR PAIVA ◽  
VINÍCIUS COUTO ALVES
Keyword(s):  
Organic Matter ◽  
Community Composition ◽  
Annual Cycle ◽  
Seasonal Cycle ◽  
Organic Matter Content ◽  
Matter Content ◽  
King George Island ◽  
Maritime Antarctica ◽  
Admiralty Bay

Composition and biomass of an Antarctic megafauna community were studied during a discontinuous 12 months cycle (March–December 1999 and December 2000–March 2001) at two stations (12 and 25 m depth) in Admiralty Bay, King George Island, Antarctica. During this period iceberg impacts were monitored in order to analyse their role in structuring the community. Organic matter content of the sediment showed a seasonal cycle for both depths, with lower values during winter and higher in summer. Composition and biomass of the megafauna were comparable to those described in previous surveys for the maritime Antarctica. Interannual or summer/winter changes in the density or biomass of the megafauna community were not significant, although significant differences between depths occurred during the whole survey. The observed community composition can be the considered result of a continuous invasion from a deeper fauna, constrained at shallower waters by the effects of ice and storms.

A new Antarctic foraminiferal species for detecting climate change in sub-Recent glacier-proximal sediments

2009 ◽  
Vol 21 (5) ◽  
pp. 439-448 ◽  
Author(s):  
Wojciech Majewski ◽  
Andrzej Tatur
Keyword(s):  
Climate Change ◽  
Climate Warming ◽  
The Arctic ◽  
South Shetland Islands ◽  
King George Island ◽  
Tidewater Glaciers ◽  
Admiralty Bay ◽  
Shetland Islands ◽  
Foraminiferal Species ◽  
Water Depths

AbstractCribroelphidium webbi sp. nov. is the only adequately described sub-Recent elphidiid foraminifer from Antarctica. In Admiralty Bay (King George Island, South Shetland Islands), it is found at several locations within inner fiord setting at water depths between 33 and 165 m, but most commonly shallower than 100 m. In outer basins this foraminifer is absent. In the cores analysed, C. webbi sp. nov. is present in well-constrained sub-Recent horizons that are clearly related to climate warming and deglaciation. These horizons represent a diachronous facies marker rather than a single stratigraphic layer. Cribroelphidium webbi sp. nov. shows clear association with retreating tidewater glaciers, therefore it is an important sensitive glacier-proximal indicator. It appears that it shares similar ecologic affinities with Cribroelphidium excavatum clavatum, which is widely distributed throughout the Arctic.

scholarly journals A new mini box corer for sampling muddy bottoms in antarctic shallow waters

2009 ◽  
Vol 52 (3) ◽  
pp. 629-636 ◽  
Author(s):  
Carlos Alejandro Echeverría ◽  
Helena Passeri Lavrado ◽  
Lúcia Campos ◽  
Paulo Cesar de Paiva
Keyword(s):  
Stainless Steel ◽  
Shallow Waters ◽  
King George Island ◽  
Sampling Area ◽  
Sampling Device ◽  
Admiralty Bay ◽  
Direct Sampling ◽  
External Frame ◽  
Bottom Sampling ◽  
Box Corer

A new Mini Box Corer (MBC-GEAMB) was developed for bottom sampling in Antarctic shallow waters down to 100 m depth from a small vessel. It consists of a detachable stainless steel box with a total sampling area of 0.0625 m², and a closing arm with a detachable blade without an external frame. MBC allowed stratified bottom sampling and good quality samples comparable to those obtained through diving. A comparison between the MBC-GEAMB and a 0.056 m²van Veen grab (VV) was undertaken for the benthic macrofaunal composition in Admiralty Bay, King George Island (Antarctica). MBC and VV samples were taken from three depths (20, 30 and 60m) in two sites. Total densities sampled with the MBC were up to 10 times higher than those obtained with van Veen grab. VV samples might lead to faunistic abundance underestimation compared to the MBC samples. Besides, MBC showed a higher performance on discriminating different sites as regards total macrofaunal density. It is suggested that MBC could be employed as an efficient remote sampling device for shallow-waters where direct sampling by SCUBA was not advisable.

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