Xuezhu Wang

Shanghai University

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Qiang Wang

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung

Sergey Danilov

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung

Thomas Jung

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung

Dmitry Sidorenko

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung

Claudia Wekerle

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung

Jens Schröter

University of Bonn

Xidong Wang

Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)

Dmitry Sein

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung

Jiao Chen

Ministry of Natural Resources

Tido Semmler

Met Éireann

Cooperative Institutions

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung

Ministry of Natural Resources

NSF National Center for Atmospheric Research

University of Bremen

Centre National de la Recherche Scientifique

Chinese Academy of Sciences

Australian Wool Innovation (Australia)

CMCC Foundation - Euro-Mediterranean Center on Climate Change

Shanghai Jiao Tong University

Hohai University

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Impacts of strong wind events on sea ice and water mass properties in Antarctic coastal polynyas

Climate Dynamics (2021)

Xiaoqiao Wang Zhaoru Zhang Xuezhu Wang Timo Vihma Meng Zhou

Abstract Strong offshore wind events (SOWEs) occur frequently near the Antarctic coast during austral winter. These wind events are typically associated with passage of synoptic- or meso-scale cyclones, which interact with the katabatic wind field and affect sea ice and oceanic processes in coastal polynyas. Based on numerical simulations from the coupled Finite Element Sea-ice Ocean Model (FESOM) driven by the CORE-II forcing, two coastal polynyas along the East Antarctica coast––the Prydz Bay Polynya and the Shackleton Polynya are selected to examine the response of sea ice and oceanic properties to SOWEs. In these polynyas, the southern or western flanks of cyclones play a crucial role in increasing the offshore winds depending on the local topography. Case studies for both polynyas show that during SOWEs, when the wind speed is 2–3 times higher than normal values, the offshore component of sea ice velocity can increase by 3–4 times. Sea ice concentration can decrease by 20–40%, and sea ice production can increase up to two to four folds. SOWEs increase surface salinity variability and mixed layer depth, and such effects may persist for 5–10 days. Formation of high salinity shelf water (HSSW) is detected in the coastal regions from surface to 800 m after 10–15 days of the SOWEs, while the HSSW features in deep layers exhibit weak response on the synoptic time scale. HSSW formation averaged over winter is notably greater in years with longer duration of SOWEs.

Fast ice

Lead (geology)

Forcing (mathematics)

10.1007/s00382-021-05878-7

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Citations (22)

The Finite Element Sea Ice-Ocean Model (FESOM) v.1.4: formulation of an ocean general circulation model

Geoscientific model development (2014)

Qiang Wang Sergey Danilov Dmitry Sidorenko R. Timmermann Claudia Wekerle

Abstract. The Finite Element Sea Ice-Ocean Model (FESOM) is the first global ocean general circulation model based on unstructured-mesh methods that has been developed for the purpose of climate research. The advantage of unstructured-mesh models is their flexible multi-resolution modelling functionality. In this study, an overview of the main features of FESOM will be given; based on sensitivity experiments a number of specific parameter choices will be explained; and directions of future developments will be outlined. It is argued that FESOM is sufficiently mature to explore the benefits of multi-resolution climate modelling and that its applications will provide information useful for the advancement of climate modelling on unstructured meshes.

10.5194/gmd-7-663-2014

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Citations (268)

Interannual Variations of Heat Budget over the Eastern Ross Sea Shelf and the Forcing Mechanisms

Research Square (Research Square) (2022)

Yuanjie Chen Zhaoru Zhang Xuezhu Wang Xiaohui Liu Meng Zhou

Abstract The temporal variation of heat budget in the subsurface layer of the eastern Ross Sea shelf (ERSS) is crucial for understanding the stability of ice shelves in the Ross Sea. In this study, six-year simulations from the Southern Ocean State Estimate (SOSE) are employed to analyze the interannual variations of heat budget in the subsurface layer of ERSS and the controlling mechanisms. The results reveal that the annual change in the heat content of the study region is dominated by the horizontal heat advection term, and only in one year the vertical advection and diffusion terms also play an important role. The horizontal advection term is co-affected by the intrusion of warm circumpolar deep water (CDW) onto the shelf across the northern boundary of ERSS, the transport of cold high salinity shelf water (HSSW) from the western Ross Sea shelf (WRSS), and the transport of CDW across the western boundary of ERSS. Contributions from these physical processes to the change of annual heat content vary over the years. The interannual variation of the CDW intrusion is modulated by the strength of eddy activities over the slope, and the interannual variation of heat transports related to HSSW is affected both by the extent of HSSW on the western shelf and coastal circulations that affect the eastward spreading of HSSW.

Forcing (mathematics)

Boundary current

10.21203/rs.3.rs-1551617/v1

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Assessment of an Arctic Ocean model in a global configuration using the Finite Element Sea-ice Ocean Model (FESOM)

Xuezhu Wang Qiang Wang Dmitry Sidorenko Sergey Danilov Jens Schröter

The coupled sea-ice ocean model FESOM is based on the finite element method and hydrostatic primitive equa- tions. Both the ocean and ice modules are discretized on the same triangular surface meshes, allowing direct exchange of fluxes and fields between the two components. Recently, this model has been employed to resolve multi-scale dynamics in the Arctic Ocean. This work is conducted using global simulations with local mesh re- finement in the Arctic Ocean. The global background resolution is 1.5 degree. Two simulations with different resolutions of 24km and 9km in the Arctic region have been conducted. The model performance in the Arctic Ocean is assessed comparing the available observational data. The comparison results demonstrate that the model can well simulate the general ocean circulation and important ocean and sea ice processes, although model param- eters and/or forcing for the focus of the Arctic Ocean modeling need to be further optimized in the future work. The sensitivity of the model performance to local mesh refinement in the Arctic Ocean is analyzed.

Ocean surface topography

Hydrostatic equilibrium

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Evaluation of the Arctic Sea-Ice Simulation on SODA3 Datasets

Advances in Atmospheric Sciences (2023)

Zhicheng Ge Xuezhu Wang Xidong Wang

10.1007/s00376-023-2320-6

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On Timescales and Reversibility of the Ocean's Response to Enhanced Greenland Ice Sheet Melting in Comprehensive Climate Models

Geophysical Research Letters (2022)

Torge Martin Arne Biastoch Gerrit Lohmann Uwe Mikolajewicz Xuezhu Wang

Abstract Warming of the North Atlantic region in climate history often was associated with massive melting of the Greenland Ice Sheet. To identify the meltwater's impacts and isolate these from internal variability and other global warming factors, we run single‐forcing simulations including small ensembles using three complex climate models differing only in their ocean components. In 200‐year‐long preindustrial climate simulations, we identify robust consequences of abruptly increasing Greenland runoff by 0.05 Sv: sea level rise of 44 ± 10 cm, subpolar North Atlantic surface cooling of 0.7°C, and a moderate AMOC decline of 1.1–2.0 Sv. The latter two emerge in under three decades—and reverse on the same timescale after the perturbation ends in year 100. The ocean translates the step‐change perturbation into a multidecadal‐to‐centennial signature in the deep overturning circulation. In all simulations, internal variability creates notable uncertainty in estimating trends, time of emergence, and duration of the response.

Greenland ice sheet

Meltwater

Ice-sheet model

Forcing (mathematics)

Future sea level

10.1029/2021gl097114

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Citations (32)

Global FESOM simulations under the framework of interannual Coordinated Ocean-ice Reference Experiments (CORE-II)

Qiang Wang Dmitry Sidorenko Xuezhu Wang Claudia Wekerle Sergey Danilov

Ice core

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Long-term ocean simulations in FESOM: evaluation and application in studying the impact of Greenland Ice Sheet melting

Ocean Dynamics (2012)

Xuezhu Wang Qiang Wang Dmitry Sidorenko Sergey Danilov Jens Schröter

Arctic dipole anomaly

Arctic geoengineering

Hindcast

Greenland ice sheet

Physical oceanography

Temperature salinity diagrams

10.1007/s10236-012-0572-2

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Citations (21)

A 4.5 km resolution Arctic Ocean simulation with the global multi-resolution model FESOM1.4

Qiang Wang Claudia Wekerle Sergey Danilov Xuezhu Wang Thomas Jung

Abstract. In the framework of developing a global modeling system which can facilitate modeling studies on Arctic Ocean and high-mid latitude linkage, we evaluate the Arctic Ocean simulated by the multi-resolution ocean sea-ice model FESOM. To explore the value of using high horizontal resolution for Arctic Ocean modeling, we use two global meshes differing in the horizontal resolution only in the Arctic Ocean (24 km vs. 4.5 km). The high resolution significantly improves the model's representation of the Arctic Ocean. The most pronounced improvement is in the Arctic intermediate layer, in terms of both Atlantic Water (AW) mean state and variability. The deepening and thickening bias of the AW layer, a common issue found in coarse resolution simulations, is significantly alleviated by using higher resolution. The topographic steering of the AW is stronger and the seasonal and interannual temperature variability along the ocean bottom topography is enhanced in the high resolution simulation. The high resolution also improves the ocean surface circulation, mainly through a better representation of the narrow straits in the Canadian Arctic Archipelago (CAA). The representation of CAA throughflow not only influences the release of water masses through the other gateways, but also the circulation pathways inside the Arctic Ocean. However, the mean state and variability of Arctic freshwater content and the variability of freshwater transport through the Arctic gateways appear not to be very sensitive to the increase in resolution employed here. We also discuss model issues that are not directly linked to resolution, highlighting the need for further model development including improving parameterizations.

Arctic dipole anomaly

Arctic geoengineering

10.5194/gmd-2017-136

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Citations (11)

TORUS: Towards decadal climate predictions using a model system with regional refinement of the Arctic

AGUFM (2012)

Dmitry Sidorenko Tido Semmler Thomas Rackow Stephan Juricke Claudia Wekerle

Climate system

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