Hydrography and energetics of a cold subpolar fjord: Andvord Bay, western Antarctic Peninsula

Lundesgaard, Øyvind; Winsor, Peter; Truffer, Martin; Merrifield, M. A.; Powell, Brian; Statscewich, Hank; Eidam, Emily; Smith, Craig R.

doi:10.1016/j.pocean.2019.102224

Cited by 19 publications

(30 citation statements)

References 101 publications

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“…We estimate an approximate meltwater input of 23600 m 3 d -1 in order to account for the observed changes in oxygen isotope ratios in the surface layer. This estimate is within the derived estimates of surface meltwater flux generated by warm atmospheric temperatures (1.4 x 10 4 to 1.2 x 10 5 m 3 d -1 ; Lundesgaard et al 2020). MWf is strongly correlated with phytoplankton abundance within Andvord Bay; for a detailed discussion see Pan et al, (2019).…”

Section: Seasonality and Hydrography In Andvord Baysupporting

confidence: 82%

“…Physical properties measured in the study region showed the dominant water masses in the fjord were Antarctic Surface Water (cold fresh) and Bransfield Strait water (cold and salty) (Lundesgaard et al, 2020). However, during late-Spring, greater influence of modified Upper Circumpolar Deep Water was observed outside of the fjord, indicated by its distinctly higher temperature at depth, but is constrained from entering the fjord due to a shallow sill near the fjord mouth (Fig.…”

Section: Seasonality and Hydrography In Andvord Baymentioning

confidence: 93%

“…Periods of vertical mixing are shown to occur during katabatic wind events (Lundesgaard et al 2019(Lundesgaard et al , 2020. This could be an important mechanism for supplying additional dFe from the subglacial plume to the surface within the fjord.…”

Section: Subsurface and Deep Sources And Exportmentioning

confidence: 95%

“…In the coastal zone of a remote island in the Bransfield Strait, an excess of strong Fe-binding ligands was observed, hypothesized to indicate Fe-limiting conditions (Buck, Selph and Barbeau, 2010). Temperature and salinity profiles show a strong signature of Bransfield Strait water within Andvord (Lundesgaard et al, 2020). The presence of excess strong Fe-binding ligands at IBA and S3 during the bloom onset also correspond to elevated NO3 -:dFe (data not shown) above the threshold for potential Felimitation of coastal diatoms in the California Current transition zone (~10-12 µM/nM King and Barbeau 2011).…”

Section: Organic Speciation Of Dissolved Fementioning

confidence: 98%

“…We present trace metal results from two expeditions (December 2015 and April 2016) to Andvord Bay, a cold glacio-marine fjord located mid-latitude along the WAP. This study is part of the FjordEco project which assessed the ecosystem function and seasonality of Andvord Bay (Pan et al 2019;Pan et al 2020;Ziegler et al 2020;Eidam et al 2019;Lundesgaard et al 2020Lundesgaard et al , 2019Hahn-Woernle et al 2020). The WAP is host to the most extensive collection of glaciomarine fjords on the at -20°C until complete digestion by HNO3/HF mixture.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Seasonal dispersal of fjord meltwaters as an important source of iron to coastal Antarctic phytoplankton

Forsch¹,

Hahn-Woernle²,

Sherrell³

et al. 2021

Preprint

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Section: Seasonality and Hydrography In Andvord Baysupporting

confidence: 82%

Section: Seasonality and Hydrography In Andvord Baymentioning

confidence: 93%

Section: Subsurface and Deep Sources And Exportmentioning

confidence: 95%

Section: Organic Speciation Of Dissolved Fementioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Seasonal dispersal of fjord meltwaters as an important source of iron to coastal Antarctic phytoplankton

Forsch¹,

Hahn-Woernle²,

Sherrell³

et al. 2021

Preprint

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High benthic community respiration and ecosystem response to phytodetrital input in a subpolar fjord on the West Antarctic Peninsula

Cecchetto,

Smith,

Nunnally

et al. 2024

Limnology & Oceanography

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Glaciomarine fjords dominate the coastal margin of the West Antarctic Peninsula. Studies in similar habitats in the Arctic have shown that benthic biodiversity and ecosystem functioning in inner and middle fjord basins are reduced by turbidity and sedimentation disturbance caused by climate warming–enhanced glacial melting. In contrast, the inner and middle fjord basins along the West Antarctic Peninsula are characterized as productivity and biodiversity hotspots, but benthic ecosystem functions remain unevaluated. In 2015–2016, we conducted sediment respiration and 13C pulse‐chase experiments to assess benthic ecosystem functions along a five‐station transect at ~ 500–600 m depths from the inner Andvord Bay fjord, through to Gerlache Strait, and onto the open continental shelf. Incubation samples from the inner and middle basins of Andvord Bay showed peaks in background seafloor respiration, benthic biomass, and uptake of labeled algal biomass compared to more outlying stations; the continental shelf exhibited the lowest levels of these variables, as well as dissolved inorganic carbon production. Macrofaunal community uptake was responsible for most of the C processing in the inner and middle parts of the fjord (> 45%) while dissolved inorganic carbon was the dominant repository of processed C near the fjord mouth and on the continental shelf (> 80%). The inner parts of Andvord Bay are hotspots of benthic C‐cycling and metabolism, in addition to biodiversity. Ongoing climate warming is likely to negatively impact these inner‐fjord hotspots by increasing meltwater input and sedimentation disturbance, yielding a reduction in the input and recycling of labile detritus at the seafloor in the inner‐middle fjord.

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Antarctic ecosystem responses following ice‐shelf collapse and iceberg calving: Science review and future research

Ingels

Aronson

Smith

et al. 2020

WIREs Climate Change

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The calving of A‐68, the 5,800‐km2, 1‐trillion‐ton iceberg shed from the Larsen C Ice Shelf in July 2017, is one of over 10 significant ice‐shelf loss events in the past few decades resulting from rapid warming around the Antarctic Peninsula. The rapid thinning, retreat, and collapse of ice shelves along the Antarctic Peninsula are harbingers of warming effects around the entire continent. Ice shelves cover more than 1.5 million km2 and fringe 75% of Antarctica's coastline, delineating the primary connections between the Antarctic continent, the continental ice, and the Southern Ocean. Changes in Antarctic ice shelves bring dramatic and large‐scale modifications to Southern Ocean ecosystems and continental ice movements, with global‐scale implications. The thinning and rate of future ice‐shelf demise is notoriously unpredictable, but models suggest increased shelf‐melt and calving will become more common. To date, little is known about sub‐ice‐shelf ecosystems, and our understanding of ecosystem change following collapse and calving is predominantly based on responsive science once collapses have occurred. In this review, we outline what is known about (a) ice‐shelf melt, volume loss, retreat, and calving, (b) ice‐shelf‐associated ecosystems through sub‐ice, sediment‐core, and pre‐collapse and post‐collapse studies, and (c) ecological responses in pelagic, sympagic, and benthic ecosystems. We then discuss major knowledge gaps and how science might address these gaps. This article is categorized under: Climate, Ecology, and Conservation > Modeling Species and Community Interactions

show abstract

Hydrography and energetics of a cold subpolar fjord: Andvord Bay, western Antarctic Peninsula

Cited by 19 publications

References 101 publications

Seasonal dispersal of fjord meltwaters as an important source of iron to coastal Antarctic phytoplankton

Seasonal dispersal of fjord meltwaters as an important source of iron to coastal Antarctic phytoplankton

High benthic community respiration and ecosystem response to phytodetrital input in a subpolar fjord on the West Antarctic Peninsula

Antarctic ecosystem responses following ice‐shelf collapse and iceberg calving: Science review and future research

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