Transformation of sulfur species in lake sediments at Ardley Island and Fildes Peninsula, King George Island, Antarctic Peninsula

2020 ◽  
Vol 703 ◽  
pp. 135591 ◽  
Author(s):  
Yuanqing Chen ◽  
Lili Shen ◽  
Tao Huang ◽  
Zhuding Chu ◽  
Zhouqing Xie
Keyword(s):  
Lake Sediments ◽  
Antarctic Peninsula ◽  
King George Island ◽  
Sulfur Species ◽  
Fildes Peninsula

scholarly journals ANALYSIS OF SHALLOW LAKE SEDIMENTS IN THE FILDES PENINSULA, KING GEORGE ISLAND, MARITIME ANTARCTICA

2020 ◽  
Vol 21 (2) ◽  
Author(s):  
Janayna Cynthia De Medeiros Galvão ◽  
Rosemary Vieira ◽  
Kátia Kellem Da Rosa ◽  
Carina Petsch ◽  
Fabrício Ferreira ◽  
...  
Keyword(s):  
Lake Sediments ◽  
Shallow Lake ◽  
King George Island ◽  
Maritime Antarctica ◽  
Fildes Peninsula

Phytoplankton in the embayments of King George Island (Antarctic Peninsula): a review with emphasis on diatoms

Polar Record ◽  
2018 ◽  
Vol 54 (2) ◽  
pp. 158-175 ◽  
Author(s):  
Priscila Kienteca Lange ◽  
Ryszard Ligowski ◽  
Denise Rivera Tenenbaum
Keyword(s):  
Antarctic Peninsula ◽  
Early Summer ◽  
Western Antarctic Peninsula ◽  
King George Island ◽  
Accurate Identification ◽  
Phytoplankton Assemblages ◽  
Marine Food Web ◽  
Planktonic Diatoms ◽  
Local Material ◽  
Marine Food

ABSTRACTConsidering that phytoplankton assemblages are good bioindicators of environmental conditions, the sensitivity of the Western Antarctic Peninsula (WAP) to climate change, and the importance of some areas of its islands as Antarctic Specially Managed Areas, this work assembles published datasets on phytoplankton biodiversity and ecology in confined coastal areas (embayments) of King George Island, WAP. Over 33 years (1980–2013), 415 species from 122 genera have been identified to species level, being mostly diatoms (371 species), with 10 new species described with local material (6 diatoms, 4 cyanobacteria). The importance of diatoms was indicated by the frequent occurrence of Corethron pennatum, Pseudogomphonema kamtshaticum, and abundant benthic genera in the plankton (e.g. Navicula, Cocconeis). The increased contribution of dinoflagellates after 2010 suggests marked changes in the water column. Early-summer blooms differ between the bays' eastern and western shores, with terrestrial melting and wind-driven upwelling inducing the dominance of benthic species at eastern shores, whereas planktonic diatoms (Thalassiosira, Pseudo-nizschia, and Chaetoceros) are most abundant along western shores and central areas. The importance of an accurate identification of organisms that are becoming key ecological components of the region is discussed, as recent changes in the microflora may affect the entire marine food web.

scholarly journals Mesospheric front observations by the OH airglow imager carried out at Ferraz Station on King George Island, Antarctic Peninsula, in 2011

2018 ◽  
Vol 36 (1) ◽  
pp. 253-264 ◽  
Author(s):  
Gabriel Augusto Giongo ◽  
José Valentin Bageston ◽  
Paulo Prado Batista ◽  
Cristiano Max Wrasse ◽  
Gabriela Dornelles Bittencourt ◽  
...  
Keyword(s):  
Antarctic Peninsula ◽  
Near Infrared ◽  
Middle Atmosphere ◽  
Convective Cloud ◽  
Atmospheric Composition ◽  
Secondary Wave ◽  
King George Island ◽  
Composition And Structure ◽  
Waves And Tides ◽  
Energy And Momentum

Abstract. The main goals of this work are to characterize and investigate the potential wave sources of four mesospheric fronts identified in the hydroxyl near-infrared (OH-NIR) airglow images, obtained with an all-sky airglow imager installed at Comandante Ferraz Antarctic Station (EACF, as per its Portuguese acronym) located on King George Island in the Antarctic Peninsula. We identified and analyzed four mesospheric fronts in 2011 over King George Island. In addition, we investigate the atmospheric background environment between 80 and 100 km altitude and discuss the ducts and propagation conditions for these waves. For that, we used wind data obtained from a meteor radar operated at EACF and temperature data obtained from the TIMED/SABER satellite. The vertical wavenumber squared, m2, was calculated for each of the four waves. Even though no clearly defined duct (indicated by positive values of m2 sandwiched between layers above and below with m2  < 0) was found in any of the events, favorable propagation conditions for horizontal propagation of the fronts were found in three cases. In the fourth case, the wave front did not find any duct support and it appeared to dissipate near the zenith, transferring energy and momentum to the medium and, consequently, accelerating the wind in the wave propagation direction (near to south) above the OH peak (88–92 km). The likely wave sources for these four cases were investigated by using meteorological satellite images and in two cases we could find that strong instabilities were potential sources, i.e., a cyclonic activity and a large convective cloud cell. In the other two cases it was not possible to associate troposphere sources as potential candidates for the generation of such wave fronts observed in the mesosphere and secondary wave sources were attributed to these cases. Keywords. Atmospheric composition and structure (airglow and aurora) – meteorology and atmospheric dynamics (middle atmosphere dynamics; waves and tides)

Influence of Climate Variability in King George Island Glacier Retreat – Antarctic Peninsula

2021 ◽  
Author(s):  
Ibeth Celia Rojas Macedo ◽  
Wilson Alfredo Suarez Alayza ◽  
Edwin Anibal Loarte Cadenas ◽  
Katy Damacia Medina Marcos
Keyword(s):  
Climate Variability ◽  
Antarctic Peninsula ◽  
Enso Event ◽  
Glacier Retreat ◽  
Glacier Mass Balance ◽  
Climatic Data ◽  
King George Island ◽  
Cooling Period ◽  
Glacier Shrinkage ◽  
Landsat Satellite

&lt;p&gt;This research aims to explain the influence of climatic variables (temperature and precipitation) in King George Island (KGI) glacier shrinkage on the Antarctic Peninsula. It employed Landsat satellite images from 1989 to 2020, climatic data and ONI index from 1980 to 2019.&lt;/p&gt;&lt;p&gt;King George Island glaciers have lost 10% of their coverage in the last 31 years. Greater glacier shrinkage was shown until the first mid-period assessed, while the retreat rate slowed down for the second half of the studied period. Furthermore, of 73 KGI glaciers, 37% were marine- and land-terminating, 42% were land-terminating and 21% were sea-terminating. Nonetheless, the decreases in the ice-coverage of marine-contact glaciers (35% of glacier coverage reduced) were higher than land-terminating glaciers (17% of glacier coverage reduced).&lt;/p&gt;&lt;p&gt;There was a perceivable fluctuation in annual average air temperature for the 1980-2006 period. Nevertheless, from around 2007 to 2015/2016 there was a slight continuous cooling period and precipitation was somewhat above the average. Therefore, these patterns could explain the recent KGI glacier-retreat deceleration.&lt;/p&gt;&lt;p&gt;Unlike the 1982/1983 and 1997/1998 El Ni&amp;#241;o events, the 2015/2016 El Ni&amp;#241;o was colder with precipitation reduction from the sustained annual amount (since roughly 2007 to 2015/2016) to values below the average. Moreover, during the 2015/2016 El Ni&amp;#241;o, KGI glacier coverage reduction was the lowest for the 31 year-long evaluated. However, it was revealed that the glacier's height could increase by accumulation in El Ni&amp;#241;o years, but glacier mass balance could be more negative due to basal melting. Additionally, land-terminating glaciers have lost more glacier coverage than sea-terminating glaciers throughout this ENSO event.&lt;/p&gt;&lt;p&gt;Hence, climate variability might play a significant role in KGI glacier shrinkage, but calving process, glacier features and so on, further a combination of them should be assessed to reach a better understanding of KGI glacier retreat.&lt;/p&gt;

Debris recorded in ice free areas of an Antarctic Specially Managed Area (ASMA): Admiralty Bay, King George Island, Antarctic Peninsula

2009 ◽  
Vol 4 (1) ◽  
pp. 36-39 ◽  
Author(s):  
Martin Sander ◽  
Erli Costa ◽  
Tatiana Balbão ◽  
Ana Paula Carneiro ◽  
César Santos
Keyword(s):  
Antarctic Peninsula ◽  
King George Island ◽  
Admiralty Bay

scholarly journals Antibiotic resistance in bacterial isolates from freshwater samples in Fildes Peninsula, King George Island, Antarctica

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Daniela Jara ◽  
Helia Bello-Toledo ◽  
Mariana Domínguez ◽  
Camila Cigarroa ◽  
Paulina Fernández ◽  
...  
Keyword(s):  
Antibiotic Resistance ◽  
King George Island ◽  
Bacterial Isolates ◽  
Fildes Peninsula

Hydrochemistry of the meltwater streams on Fildes Peninsula, King George Island, Antarctica

2017 ◽  
Vol 36 (6) ◽  
pp. 2181-2193 ◽  
Author(s):  
Liping Ye ◽  
Ruifeng Zhang ◽  
Qizhen Sun ◽  
Jie Jin ◽  
Jing Zhang
Keyword(s):  
King George Island ◽  
Fildes Peninsula
Sign in / Sign up

Export Citation Format

Share Document