A Study on Characteristics of Frost Heaving With Soil Samples From Terra Nova in the East Antarctic Region

2012 ◽  
Author(s):  
YoungSeok Kim ◽  
Seung-Seo Hong ◽  
Jung-Hee Park ◽  
Jae Mo Kang ◽  
Jong-Sub Lee
Keyword(s):  
Grain Size ◽  
Frost Heave ◽  
Unfrozen Water ◽  
Frozen Ground ◽  
Frost Heaving ◽  
Terra Nova Bay ◽  
Terra Nova ◽  
Under Construction ◽  
The Antarctic ◽  
Station Site

The second scientific Antarctica station of South Korea is under construction at Terra Nova Bay located in east Antarctica. The objective of this study is the evaluation of the frost heave susceptibility of soils sampled from the second station site by performing laboratory frost heaving tests. Experiments are carried out with the soil specimens taken from five different areas at Terra Nova Bay. Test specimens are frozen with constant temperatures at the top and bottom of the specimen at −17 °C and 4 °C, respectively. In addition, grain size analyses and unfrozen water tests are also performed for monitoring the characteristics of the water contained in the permafrost. Frost susceptibility is evaluated by standard methods recommended in UK, US and Japan. Experimental results show that the more the fine contents exist in soils, the more frost heave occurs. The result denotes that grain size has a significant effect on frost heave. The results suggest that the frost heaving susceptibility of the frozen ground at the Antarctic site would be effectively evaluated through the grain size and the frost heaving parameters.

Vitellogenin gene expression in males of the Antarctic fish Trematomus bernacchii from Terra Nova Bay (Ross Sea): A role for environmental cadmium?

Chemosphere ◽  
2007 ◽  
Vol 66 (7) ◽  
pp. 1270-1277 ◽  
Author(s):  
Adriana Canapa ◽  
Marco Barucca ◽  
Stefania Gorbi ◽  
Maura Benedetti ◽  
Sara Zucchi ◽  
...  
Keyword(s):  
Gene Expression ◽  
Ross Sea ◽  
Antarctic Fish ◽  
Terra Nova Bay ◽  
Trematomus Bernacchii ◽  
Terra Nova ◽  
Vitellogenin Gene ◽  
The Antarctic

Ionospheric electron content across the Antarctic continent

1998 ◽  
Vol 10 (4) ◽  
pp. 493-501
Author(s):  
G. O. L. Jones ◽  
L. Kersley ◽  
J. A. T. Heaton ◽  
L. Ciraolo ◽  
P. Spalla
Keyword(s):  
Standard Model ◽  
Plasma Flow ◽  
Electron Content ◽  
Spatial Region ◽  
Terra Nova Bay ◽  
Ionospheric Electron Content ◽  
Antarctic Continent ◽  
Terra Nova ◽  
The Antarctic ◽  
First Time

Observations of satellite passes monitored at Halley and Terra Nova Bay have been combined to produce for the first time measurements of ionospheric electron content spanning the Antarctic continent. Results are presented from a sequence of four successive passes made during a period of some two hours that illustrate the development of the ionosphere over this wide spatial region. The observations are discussed in terms of the convective behaviour of the ionization, using results from the PACE radar and a standard model of the plasma flow.

scholarly journals Regulation of Microbial Activity Rates by Organic Matter in the Ross Sea during the Austral Summer 2017

2020 ◽  
Vol 8 (9) ◽  
pp. 1273
Author(s):  
Renata Zaccone ◽  
Cristina Misic ◽  
Filippo Azzaro ◽  
Maurizio Azzaro ◽  
Giovanna Maimone ◽  
...  
Keyword(s):  
Organic Matter ◽  
Ross Sea ◽  
Austral Summer ◽  
Trophic Levels ◽  
Offshore Area ◽  
Terra Nova Bay ◽  
Prokaryotic Abundance ◽  
Microbiological Parameters ◽  
Terra Nova ◽  
The Antarctic

The active prokaryotic communities proliferate in the ecosystems of the Antarctic Ocean, participating in biogeochemical cycles and supporting higher trophic levels. They are regulated by several environmental and ecological forcing, such as the characteristics of the water masses subjected to global warming and particulate organic matter (POM). During summer 2017, two polynyas in the Ross Sea were studied to evaluate key-microbiological parameters (the proteasic, glucosidasic, and phosphatasic activities, the microbial respiratory rates, the prokaryotic abundance and biomass) in relation to quantitative and qualitative characteristics of POM. Results showed significant differences in the epipelagic layer between two macro-areas (Terra Nova Bay and Ross Sea offshore area). Proteins and carbohydrates were metabolized rapidly in the offshore area (as shown by turnover times), due to high enzymatic activities in this zone, indicating fresh and labile organic compounds. The lower quality of POM in Terra Nova Bay, as shown by the higher refractory fraction, led to an increase in the turnover times of proteins and carbohydrates. Salinity was the physical constraint that played a major role in the distribution of POM and microbial activities in both areas.

scholarly journals Characterization of snowfall estimated by in situ and ground-based remote-sensing observations at Terra Nova Bay, Victoria Land, Antarctica

2020 ◽  
Vol 66 (260) ◽  
pp. 1006-1023
Author(s):  
Claudio Scarchilli ◽  
Virginia Ciardini ◽  
Paolo Grigioni ◽  
Antonio Iaccarino ◽  
Lorenzo De Silvestri ◽  
...  
Keyword(s):  
Summer Precipitation ◽  
Fall Velocity ◽  
Large Variability ◽  
Surface Mass ◽  
Bay Area ◽  
Terra Nova Bay ◽  
Precipitation Timing ◽  
Terra Nova ◽  
The Antarctic ◽  
The Relationship

AbstractKnowledge of the precipitation contribution to the Antarctic surface mass balance is essential for defining the ice-sheet contribution to sea-level rise. Observations of precipitation are sparse over Antarctica, due to harsh environmental conditions. Precipitation during the summer months (November–December–January) on four expeditions, 2015–16, 2016–17, 2017–18 and 2018–19, in the Terra Nova Bay area, were monitored using a vertically pointing radar, disdrometer, snow gauge, radiosounding and an automatic weather station installed at the Italian Mario Zucchelli Station. The relationship between radar reflectivity and precipitation rate at the site can be estimated using these instruments jointly. The error in calculated precipitation is up to 40%, mostly dependent on reflectivity variability and disdrometer inability to define the real particle fall velocity. Mean derived summer precipitation is ~55 mm water equivalent but with a large variability. During collocated measurements in 2018–19, corrected snow gauge amounts agree with those derived from the relationship, within the estimated errors. European Centre for the Medium-Range Weather Forecasts (ECMWF) and the Antarctic Mesoscale Prediction System (AMPS) analysis and operational outputs are able to forecast the precipitation timing but do not adequately reproduce quantities during the most intense events, with overestimation for ECMWF and underestimation for AMPS.

Six new species of Grania (Oligochaeta, Enchytraeidae) from the Ross Sea, Antarctica

1996 ◽  
Vol 8 (2) ◽  
pp. 169-183 ◽  
Author(s):  
Emilia Rota ◽  
Christer Erséus
Keyword(s):  
New Species ◽  
Ross Sea ◽  
Abundant Species ◽  
The Body ◽  
Mcmurdo Sound ◽  
Widespread Species ◽  
Terra Nova Bay ◽  
Specific Shape ◽  
Terra Nova ◽  
The Antarctic

Six new species of marine Enchytraeidae, Grania hirsuticauda sp.n., G. acanthochaeta sp.n., G. carchinii sp.n., G. angustinasus sp.n., G. antarctica sp.n. and G. algida sp.n., are described from benthic material collected in McMurdo Sound during 1959–61 and Terra Nova Bay in 1988. They represent the first records of this family from below the Antarctic circle and, together with tubificids, the first oligochaetes from the Ross Sea. G. hirsuticauda, apparently the most widespread species in McMurdo Sound, is distinguished by having setae abruptly larger in the posterior third of the body and almost nodulate; a T-shaped prostomial bifurcation of the dorsal vessel, short sperm funnels and sperm sac, and thick-walled spermathecae. G. acanthochaeta possesses a unique, thorn-like, setal morphology and diverticulate spermathecal ampullae. G. carchinii, the only new species lacking lateral setae, is also distinguished by a remarkably high development of the chloragogen tissue and the possession of nephridia at 6/7. G. angustinasus, the most abundant species in the sampling area in Terra Nova Bay, and G. antarctica, have the same setal distribution, size and (curved) shape, but show different forms of penial bulbs (more complex in G. angustinasus) and spermathecal structures (the ampullae being larger and the external pores more posterior in G. antarctica). G. algida is distinguished by its L-shaped setae and carrot-shaped, diverticulate, spermathecal ampullae. All the new species lack cuticular penial stylets as well as spermathecal ectal glands. All species but G. carchinii are peculiar in possessing, in front of the brain, a middorsal vesicular body of specific shape and size containing a few refractile inclusions; a sensory (possibly a statocyst-like) function is suggested for this ‘head organ’, which has not been previously reported in the Oligochaeta.

scholarly journals Terpenoid Content of the Antarctic Soft Coral Alcyonium antarcticum

2009 ◽  
Vol 4 (12) ◽  
pp. 1934578X0900401 ◽  
Author(s):  
Emiliano Manzo ◽  
Maria Letizia Ciavatta ◽  
Genoveffa Nuzzo ◽  
Margherita Gavagnin
Keyword(s):  
Structure Elucidation ◽  
Soft Coral ◽  
Chemical Investigation ◽  
Terra Nova Bay ◽  
Nmr Techniques ◽  
Terra Nova ◽  
The Antarctic

Chemical investigation of the soft coral Alcyonium antarcticum, collected off Terra Nova Bay, resulted in the isolation of two closely related sesquiterpenes, alcyonicene (1) and deacetoxy-alcyonicene (2), along with known terpenoid compounds. The structure elucidation of the new molecules, possessing a rare bulgarane skeleton, has been made mainly by NMR techniques.

Direct Gravimetric Measurements of the Mass of the Antarctic Aerosol Collected by High Volume Sampler: PM10 Summer Seasonal Variation at Terra Nova Bay

2005 ◽  
Vol 95 (11-12) ◽  
pp. 867-876 ◽  
Author(s):  
Cristina Truzzi ◽  
Luca Lambertucci ◽  
Silvia Illuminati ◽  
Anna Annibaldi ◽  
Giuseppe Scarponi
Keyword(s):  
Seasonal Variation ◽  
High Volume ◽  
Terra Nova Bay ◽  
Gravimetric Measurements ◽  
Terra Nova ◽  
The Antarctic ◽  
High Volume Sampler
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