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Registration Number

0225U004678, (0121U113509) , R & D reports

Title

Polar Regions in the Earth System

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Імплементація та валідація чисельної моделі гідротермодинаміки порожнин під шельфовими льодовиками в модель циркуляції океану

Head

Maderych Volodymyr S., д.ф.-м.н.

Registration Date

16-12-2025

Organization

Institute of Mathematical Machines and System Problems NAS Ukraine.

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The overall goal of the project is to provide a new understanding of the key processes of atmosphere-ocean-ice interaction in the Arctic and Antarctic, their reactions and impact on global climate change and their consequences for society and the environment. To this end, a new numerical model of hydrothermodynamics of cavities in the ocean under shelf glaciers will be developed, which will be implemented in the model of ocean circulation and calculations of the processes of formation of deep ocean waters will be performed. The trajectories of Antarctic water masses will be studied using the Lagrangian model. The potential contamination of the Arctic Ocean with radionuclides under the influence of climate change will be estimated using mathematical models. The work is performed as part of a consortium of leading EU research groups in the fields of polar meteorology, oceanography and climatology.

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The study aimed to provide new insights into key local-regional-scale physical and chemical processes for atmosphere-ocean-ice interactions in the Arctic and Antarctic, their responses and impacts on projected changes in global circulation, and their implications for society and the environment. At this stage of the study, the numerical circulation models and the Lagrangian tracer model were implemented for the Weddell Sea. The SCHISM v5.9.0 model with the developed ice shelf cavity module was configured for the Weddell Sea. An unstructured horizontal grid of triangular elements was formed. The bed elevation and ice draft were taken from the Bedmap2 database. A vertical local sigma coordinate LSC2 grid was constructed to smoothly represent the ice edge and bed elevation. Initial and boundary conditions were taken from the ROMS model simulations. Lagrangian particle tracking system Parcels v. 2.0 system (https://oceanparcels.org/) was implemented to analyze water mass transformation in the Weddell Sea using WAOM's 3D ROMS simulation results. Several new options have been developed for the Parcels model. Lagrangian trajectories under the Filchner-Ronne Glacier and in the Weddell Sea were studied using numerical simulation data of the WAOM model currents and the Parcels Lagrangian system. Over 20 years, almost equal numbers of particles left the cavity through the Ronne ice front (43%) and the Filchner ice front (37%), while the remaining particles (20%) remained under the Filchner-Ronne glacier. The practical significance lies in the implementation of new options in the Parcels model. The obtained scientific results are implemented in the model of the formation of Antarctic water masses. KEYWORDS: West Antarctic sea shelf, Lagrangian methods, circulation modeling, water mass flows, statistical analysis.

Product Description

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Roman V. Bejenar
Igor O. Brovchenko
Kateryna V. Terletska
Ivan V. Kovalets
Lyudmila F. Udovenko

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2025-12-16