scholarly journals The marine system of the West Antarctic Peninsula: status and strategy for progress

2018 ◽  
Vol 376 (2122) ◽  
pp. 20170179 ◽  
Author(s):  
Katharine R. Hendry ◽  
Michael P. Meredith ◽  
Hugh W. Ducklow
Keyword(s):  
Antarctic Peninsula ◽  
The West ◽  
West Antarctic ◽  
Marine System ◽  
West Antarctic Peninsula

scholarly journals A ‘shallow bathtub ring’ of local sedimentary iron input maintains the Palmer Deep biological hotspot on the West Antarctic Peninsula shelf

2018 ◽  
Vol 376 (2122) ◽  
pp. 20170171 ◽  
Author(s):  
Robert M. Sherrell ◽  
Amber L. Annett ◽  
Jessica N. Fitzsimmons ◽  
Vincent J. Roccanova ◽  
Michael P. Meredith
Keyword(s):  
Antarctic Peninsula ◽  
Deep Water ◽  
Rapid Change ◽  
Euphotic Zone ◽  
The West ◽  
Inner Shelf ◽  
West Antarctic ◽  
Limiting Nutrient ◽  
Marine System ◽  
West Antarctic Peninsula

Palmer Deep (PD) is one of several regional hotspots of biological productivity along the inner shelf of the West Antarctic Peninsula. The proximity of hotspots to shelf-crossing deep troughs has led to the ‘canyon hypothesis’, which proposes that circumpolar deep water flowing shoreward along the canyons is upwelled on the inner shelf, carrying nutrients including iron (Fe) to surface waters, maintaining phytoplankton blooms. We present here full-depth profiles of dissolved and particulate Fe and manganese (Mn) from eight stations around PD, sampled in January and early February of 2015 and 2016, allowing the first detailed evaluation of Fe sources to the area's euphotic zone. We show that upwelling of deep water does not control Fe flux to the surface; instead, shallow sediment-sourced Fe inputs are transported horizontally from surrounding coastlines, creating strong vertical gradients of dissolved Fe within the upper 100 m that supply this limiting nutrient to the local ecosystem. The supply of bioavailable Fe is, therefore, not significantly related to the canyon transport of deep water. Near shore time-series samples reveal that local glacial meltwater appears to be an important Mn source but, surprisingly, is not a large direct Fe input to this biological hotspot. 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 Variability and change in the west Antarctic Peninsula marine system: Research priorities and opportunities

2019 ◽  
Vol 173 ◽  
pp. 208-237 ◽  
Author(s):  
Sian F. Henley ◽  
Oscar M. Schofield ◽  
Katharine R. Hendry ◽  
Irene R. Schloss ◽  
Deborah K. Steinberg ◽  
...  
Keyword(s):  
Antarctic Peninsula ◽  
Research Priorities ◽  
System Research ◽  
The West ◽  
West Antarctic ◽  
Marine System ◽  
West Antarctic Peninsula

scholarly journals Changes in the upper ocean mixed layer and phytoplankton productivity along the West Antarctic Peninsula

2018 ◽  
Vol 376 (2122) ◽  
pp. 20170173 ◽  
Author(s):  
Oscar Schofield ◽  
Michael Brown ◽  
Josh Kohut ◽  
Schuyler Nardelli ◽  
Grace Saba ◽  
...  
Keyword(s):  
Sea Ice ◽  
Antarctic Peninsula ◽  
Mixed Layer ◽  
Carbon Fixation ◽  
Upper Ocean ◽  
The West ◽  
Phytoplankton Productivity ◽  
West Antarctic ◽  
West Antarctic Peninsula

The West Antarctic Peninsula (WAP) has experienced significant change over the last 50 years. Using a 24 year spatial time series collected by the Palmer Long Term Ecological Research programme, we assessed long-term patterns in the sea ice, upper mixed layer depth (MLD) and phytoplankton productivity. The number of sea ice days steadily declined from the 1980s until a recent reversal that began in 2008. Results show regional differences between the northern and southern regions sampled during regional ship surveys conducted each austral summer. In the southern WAP, upper ocean MLD has shallowed by a factor of 2. Associated with the shallower mixed layer is enhanced phytoplankton carbon fixation. In the north, significant interannual variability resulted in the mixed layer showing no trended change over time and there was no significant increase in the phytoplankton productivity. Associated with the recent increases in sea ice there has been an increase in the photosynthetic efficiency (chlorophyll a -normalized carbon fixation) in the northern and southern regions of the WAP. We hypothesize the increase in sea ice results in increased micronutrient delivery to the continental shelf which in turn leads to enhanced photosynthetic performance. 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 Sedimentary Nutrient Supply in Productive Hot Spots off the West Antarctic Peninsula Revealed by Silicon Isotopes

2020 ◽  
Vol 34 (12) ◽  
Author(s):  
Lucie Cassarino ◽  
Katharine R. Hendry ◽  
Sian F. Henley ◽  
Ellen MacDonald ◽  
Sandra Arndt ◽  
...  
Keyword(s):  
Antarctic Peninsula ◽  
Hot Spots ◽  
Nutrient Supply ◽  
The West ◽  
Silicon Isotopes ◽  
West Antarctic ◽  
West Antarctic Peninsula

Water-mass properties and circulation on the west Antarctic Peninsula Continental Shelf in Austral Fall and Winter 2001

2004 ◽  
Vol 51 (17-19) ◽  
pp. 1925-1946 ◽  
Author(s):  
John M. Klinck ◽  
Eileen E. Hofmann ◽  
Robert C. Beardsley ◽  
Baris Salihoglu ◽  
Susan Howard
Keyword(s):  
Continental Shelf ◽  
Antarctic Peninsula ◽  
Water Mass ◽  
The West ◽  
West Antarctic ◽  
Mass Properties ◽  
West Antarctic Peninsula
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