scholarly journals MICROPLANKTON DOMINANT GROUPS DURING THE 2013/2014 AUSTRAL SUMMER IN ADMIRALTY BAY, KING GEORGE ISLAND, WEST ANTARCTIC PENINSULA

2016 ◽  
pp. 64-68
Author(s):  
José Juan Barrera-Alba ◽  
Vinícius Henrique Reis ◽  
Márcio Murilo Barboza Tenório ◽  
Denise Rivera Tenenbaum
Keyword(s):  
Antarctic Peninsula ◽  
Austral Summer ◽  
King George Island ◽  
Admiralty Bay ◽  
West Antarctic ◽  
West Antarctic Peninsula

scholarly journals Evidences of strong sources of DFe and DMn in Ryder Bay, Western Antarctic Peninsula

2018 ◽  
Vol 376 (2122) ◽  
pp. 20170172 ◽  
Author(s):  
Johann Bown ◽  
Hans van Haren ◽  
Michael P. Meredith ◽  
Hugh J. Venables ◽  
Patrick Laan ◽  
...  
Keyword(s):  
Antarctic Peninsula ◽  
Sediment Resuspension ◽  
Vertical Mixing ◽  
Rapid Change ◽  
Austral Summer ◽  
Bottom Surface ◽  
The West ◽  
West Antarctic ◽  
Deep Waters ◽  
West Antarctic Peninsula

The spatial distribution, biogeochemical cycling and external sources of dissolved iron and dissolved manganese (DFe and DMn) were investigated in Ryder Bay, a small coastal embayment of the West Antarctic Peninsula, during Austral summer (2013 and 2014). Dissolved concentrations were measured throughout the water column at 11 stations within Ryder Bay. The concentration ranges of DFe and DMn were large, between 0.58 and 32.7 nM, and between 0.18 and 26.2 nM, respectively, exhibiting strong gradients from the surface to the bottom. Surface concentrations of DFe and DMn were higher than concentrations reported for the Southern Ocean and coastal Antarctic waters, and extremely high concentrations were detected in deep water. Glacial meltwater and shallow sediments are likely to be the main sources of DFe and DMn in the euphotic zone, while lateral advection associated with local sediment resuspension and vertical mixing are significant sources for intermediate and deep waters. During summer, vertical mixing of intermediate and deep waters and sediment resuspension occurring from Marguerite Trough to Ryder Bay are thought to be amplified by a series of overflows at the sills, enhancing the input of Fe and Mn from bottom sediment and increasing their concentrations up to the euphotic layer. This article is part of the theme issue ‘The marine system of the West Antarctic Peninsula: status and strategy for progress in a region of rapid change’.

scholarly journals Interannual Climate Variability in the West Antarctic Peninsula under Austral Summer Conditions

2021 ◽  
Vol 13 (6) ◽  
pp. 1122
Author(s):  
Eduardo Santamaría-del-Ángel ◽  
Mary-Luz Cañon-Páez ◽  
Maria-Teresa Sebastiá-Frasquet ◽  
Adriana González-Silveira ◽  
Angelica-L. Gutierrez ◽  
...  
Keyword(s):  
Climate Variability ◽  
Antarctic Peninsula ◽  
Austral Summer ◽  
Sensor Data ◽  
The West ◽  
West Antarctic ◽  
Northern Zone ◽  
Interannual Climate Variability ◽  
West Antarctic Peninsula ◽  
The Antarctic

This study aimed to describe the interannual climate variability in the West Antarctic Peninsula (WAP) under austral summer conditions. Time series of January sea-surface temperature (SST) at 1 km spatial resolution from satellite-based multi-sensor data from Moderate Resolution Imaging Spectrometer (MODIS) Terra, MODIS Aqua, and Visible Infrared Imager Radiometer Suite (VIIRS) were compiled between 2001 and 2020 at localities near the Gerlache Strait and the Carlini, Palmer, and Rothera research stations. The results revealed a well-marked spatial-temporal variability in SST at the WAP, with a one-year warm episode followed by a five-year cold episode. Warm waters (SST > 0 °C) reach the coast during warm episodes but remain far from the shore during cold episodes. This behavior of warm waters may be related to the regional variability of the Antarctic Circumpolar Current, particularly when the South Polar Front (carrying warm waters) reaches the WAP coast. The WAP can be divided into two zones representing two distinct ecoregions: the northern zone (including the Carlini and Gerlache stations) corresponds to the South Shetland Islands ecoregion, and the southern zone (including the Palmer and Rothera stations) corresponds to the Antarctic Peninsula ecoregion. The Gerlache Strait is likely situated on the border between the two ecoregions but under a greater influence of the northern zone. Our data showed that the Southern Annular Mode (SAM) is the primary driver of SST variability, while the El Niño Southern Oscillation (ENSO) plays a secondary role. However, further studies are needed to better understand regional climate variability in the WAP and its relation with SAM and ENSO; such studies should use an index that adequately describes the ENSO in these latitudes and addresses the limitations of the databases used for this purpose. Multi-sensor data are useful in describing the complex climate variability resulting from the combination of local and regional processes that elicit different responses across the WAP. It is also essential to continue improving SST approximations at high latitudes.

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