Modelling suspended particulate matter dynamics at an Antarctic fjord impacted by glacier melt

Neder, Camila; Fofonova, Vera; Androsov, Alexey; Kuznetov, Ivan; Abele, Doris; Falk, Ulrike; Schloss, Irene R; Sahade, Ricardo; Jerosch, Kerstin

doi:10.1016/j.jmarsys.2022.103734

Cited by 12 publications

(10 citation statements)

References 70 publications

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“…These strong westerly winds tend to increase freshwater residence time, so the actual mean freshwater residence time is anticipated to exceed 10.4 days. The residence time obtained through modeling in Porter Cove, which is adjacent to Marian Cove, indicated approximately 8 days (Neder et al., 2022), and it aligns closely with our findings.…”

Section: Discussionsupporting

confidence: 91%

Properties and Mechanisms of Seawater Exchange in Marian Cove, King George Island, West Antarctic Peninsula

Kim,

Park

et al. 2023

JGR Oceans

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The Antarctic Peninsula is one region that has recently experienced warming substantially more rapidly than the global mean over the past 50 years. Marian Cove is located in the South Shetland Islands connected to the Bransfield Strait via Maxwell Bay between King George Island and Nelson Island. In this study, we identified properties and mechanisms of seawater exchange in Marian Cove from multiple hydrographic surveys and a single bottom‐mounted mooring installed at the entrance to Marian Cove. Regardless of the season, the mean current velocity profiles at the entrance to Marian Cove were constant because of the influence of tidal forcing. Wind was the primary force that determined the variation in surface current; in response, a countercurrent occurred near the bottom area. We estimated salt transport to understand what effects Maxwell Bay′s saline water intrusion has on the Marian Cove environment. When the daily easterly wind was at its maximum of 18.5 m s−1, the salinity could increase to 7.20 × 10−4 g kg−1 in 1 day. In addition, the average freshwater residence time in Marian Cove for the quantitative evaluation of seawater exchange was approximately 9 days. However, the freshwater residence time was reduced to less than 2 days when there were extreme easterly winds.

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Section: Discussionsupporting

confidence: 91%

Properties and Mechanisms of Seawater Exchange in Marian Cove, King George Island, West Antarctic Peninsula

Kim,

Park

et al. 2023

JGR Oceans

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“…In addition to the partially common interface of the models, FESOM-C has specific features that are important for our work. The model was originally developed for applications with a high horizontal resolution as fine as several meters (Neder et al, 2022;Kuznetsov et al, 2020;Fofonova et al, 2019). This model uses the discretization of cells and vertices of a finite volume, which allows the use of unstructured computational grids.…”

Section: Fesom-c Modelmentioning

confidence: 99%

Dynamical reconstruction of the upper-ocean state in the Central Arctic during the winter period of the MOSAiC Expedition

Kuznetsov

Rabe

Androsov

et al. 2023

Preprint

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Abstract. The Arctic Ocean is a region important for global and regional climate. Although generally quiescent compared to mid-latitudes, the upper Arctic ocean hosts mesoscale and smaller scale processes. These processes can have a profound impact on vertical ocean fluxes, stratification, and feedback with the sea ice and atmosphere. Sparse and non-synoptic in-situ observations of the polar oceans are limited by the distribution of manual observing platforms and autonomous instrumentation. Analyzing observational data to assess tracer field gradients and upper ocean dynamics becomes highly challenging when measurement platforms drift with the ice pack due to continuous changes in drift speed direction. This work presents a dynamical reconstruction of the ocean state, based on observations of the Multidisciplinary Observatory for the Study of Arctic Climate (MOSAiC) experiment. Overall, the model can reproduce the lateral and vertical structure of the temperature, salinity, and density fields, which allows for projecting dynamically consistent features of these fields onto a regular grid. We identify two separate depth ranges of enhanced eddy kinetic energy, which are located around two maxima in buoyancy frequency: the depth of the upper halocline and the depth of the warm (modified) Atlantic Water. Simulations reveal a notable decrease in surface layer salinity and density towards the north, accompanied by high variability in the mixed layer depth in the south-north direction. And no significant horizontal gradients in salinity and density fields but an increase in mixed layer depth from west to east 0.084 m/km gradient with 0.6 m/km standard deviation, indicating opposite characteristics compared to the south-north direction. The model resolves several stationary eddies in the warm Atlantic Water and provides insights into the associated dynamics. The obtained three-dimensional fields of temperature and salinity can be used for further analysis of the thermohaline structure and related dynamics associated with submesoscale processes in the Central Arctic. Dynamic characteristics and eddy fields can be used for further analysis and comparison with state-of-the-art climate and Earth System Models. The developed nudging method can be used to utilize future observational data obtained from a diverse set of instruments.

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“…FESOM-C has already been applied in numerous idealized and realistic experiments. It is known to reliably simulate dynamics in coastal areas where the complex topology originates non-linear processes driven by the strong tidal forcing, with applications in various settings including, e.g., the North Sea [19,20], Indiga Bay [21] and Antarctic fjords [22]. The hybrid mesh capability, the terrain following vertical coordinates, the time splitting for internal/external modes and the modules specifically designed to resolve coastal processes, like the wetting-drying mechanism, make this coastal model suitable for our research.…”

Section: Numerical Experiments and Model Setupmentioning

confidence: 99%

Water Mass Transport Changes through the Venice Lagoon Inlets from Projected Sea-Level Changes under a Climate Warming Scenario

Rubinetti,

Kuznetsov,

Fofonova

et al. 2023

Water

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In this study, an ensemble of numerical simulations with a state-of-the-art hydrodynamic model for coastal applications is used to characterize, for the first time, the expected mid-21st-century changes in circulation and associated sea-level height inside the Venice lagoon induced by projected Mediterranean sea level rise and atmospheric circulation changes over the Adriatic Sea under the RCP8.5 emission scenario. Our results show that water transports through the three inlets connecting the Venice lagoon to the open sea are expected to change significantly, with consequent significant persistent alterations of the circulation and sea-level height inside the lagoon. The projected water mass redistributions motivate further studies on the implications of climate change for the lagoon environment.

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Modelling suspended particulate matter dynamics at an Antarctic fjord impacted by glacier melt

Cited by 12 publications

References 70 publications

Properties and Mechanisms of Seawater Exchange in Marian Cove, King George Island, West Antarctic Peninsula

Properties and Mechanisms of Seawater Exchange in Marian Cove, King George Island, West Antarctic Peninsula

Dynamical reconstruction of the upper-ocean state in the Central Arctic during the winter period of the MOSAiC Expedition

Water Mass Transport Changes through the Venice Lagoon Inlets from Projected Sea-Level Changes under a Climate Warming Scenario

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