The Role of Tides in Ocean‐Ice Shelf Interactions in the Southwestern Weddell Sea

Hausmann, Ute; Sallée, Jean‐Baptiste; Jourdain, Nicolas C.; Mathiot, Pierre; Rousset, Clément; Madec, Gurvan; Deshayes, Julie; Hattermann, Tore

doi:10.1029/2019jc015847

Cited by 21 publications

(32 citation statements)

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“…The configuration used here is based on, and is similar to, the 1/12° Weddell Sea configuration developed by Hausmann et al. (2020); major differences include: coarser resolution, fewer tidal constituents and use of a new surface forcing (details below). In Hausmann et al.…”

Section: Model and Experimental Designmentioning

confidence: 99%

“…In Hausmann et al. (2020), the 1/12° Weddell Sea configuration was evaluated in comparison to observations of the Weddell Sea system. With the exception of a strongly stratified summer seasonal thermocline and associated low bias in summer sea ice coverage, it was shown that, the overall circulation and water mass features in the deep, shelf, and cavity oceans are well represented in the reference simulation.…”

Section: Model and Experimental Designmentioning

confidence: 99%

“…Our results suggest that ice‐shelf/ocean modelers should carefully consider their choice of boundary conditions when running limited area models of the region. In some idealized cases, it has been past practice to use climatological boundary conditions for regional modeling studies (e.g., Hazel & Stewart, 2020; Naughten et al., 2019) but consistency between the boundary conditions and the local forcing is important for realistic representation of inter‐annual variability in re‐analysis focused studies (e.g., Hausmann et al., 2020). More generally, Figures 1a–1f show differences in the observed and simulated temperature and salinity structure of the ASC across different products/time periods.…”

Section: Summary and Further Workmentioning

confidence: 99%

“…Again, due to the pressure dependence of the freezing point, as the ISW rises it will at times refreeze to the ice shelf base. In addition to, the above processes driving the strength of the overturning circulation in the cavity, the tides drive stronger background flow speeds, resulting in a mean melt rate that is dominated by the tidal signal (Hausmann et al., 2020; Makinson et al., 2011; Mueller et al., 2018; Vaňková et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

“…The goal of this study is to examine the possible influence of changes in water mass properties in the ASC offshore of the continental shelf in relation to FRIS melt rates. Here, we use a 1/4° regional NEMO ocean configuration, which includes tides and static ice shelves (see Section 2.1); the configuration is based on the 1/12° version developed by Hausmann et al (2020). We begin with an assessment of the historical time-mean ocean state and a comparison of simulated FRIS melt rates to melt rates derived from autonomous phase-sensitive radio-echo sounder (ApRES) observations (Vaňková et al, 2020).…”

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confidence: 99%

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Remote Control of Filchner‐Ronne Ice Shelf Melt Rates by the Antarctic Slope Current

et al. 2021

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The Filchner-Ronne Ice Shelf (FRIS), located at the southern boundary of the Weddell Sea, is the largest volume of floating ice in the world (Nicholls et al., 2009). Its tributary ice streams have a combined discharge of over 254 Gigatons yr −1 , draining ∼15% of the Antarctic ice sheet by mass (Rignot et al., 2013). Several factors influence the environment that determines an ice shelf's basal melt rate, including: ice draft and bathymetry (Wei et al., 2019), sea ice growth (Markus et al., 1998), katabatic and large-scale wind patterns (Holland et al., 2019), and proximity to the shelf break of: Warm Deep Water (WDW), High Salinity Shelf Water (HSSW), Modified WDW (MWDW), and the Antarctic Circumpolar Current. With these factors in mind, the ice shelf's environment can be dynamically categorized in terms of a "cold" or "warm" regime (modes 1 and 2 in Jacobs et al., 1992, respectively), where FRIS is historically a cold regime ice shelf. For additional background, see Nicholls et al. (2009) for FRIS melt rates and relevant water masses on the surrounding continental shelf, Vernet et al. (2019) for a summary of present knowledge on the regional circulation and Dinniman et al. (2016) for a modern modeling perspective on ice shelf regimes. Future projections by Hellmer et al. (2012, 2017) suggest that the intrusion of warm water could lead to a tipping point where FRIS

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Section: Model and Experimental Designmentioning

confidence: 99%

Section: Model and Experimental Designmentioning

confidence: 99%

Section: Summary and Further Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Remote Control of Filchner‐Ronne Ice Shelf Melt Rates by the Antarctic Slope Current

et al. 2021

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Influence of ocean tides and ice shelves on ocean–ice interactions and dense shelf water formation in the D’Urville Sea, Antarctica

et al. 2021

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The D'Urville Sea, East Antarctica, is a major source of Dense Shelf Water (DSW), a precursor of Antarctic Bottom Water (AABW). AABW is a key water mass involved in the worldwide ocean circulation and longterm climate variability. The properties of AABW in global climate models suffer from several biases, making climate projections uncertain. These models are potentially omitting or misrepresenting important mechanisms involved in the formation of DSW, such as tides and ocean-ice shelf interactions. Recent studies pointed out that tides and ice shelves significantly influence the coastal seas of Antarctica, where AABW originates from. Yet, the implications of these two processes in the formation and evolution of DSW are poorly understood, in particular in the D'Urville Sea. Using a series of NEMO-LIM numerical simulations, we assess the sensitivity of dense water formation in the D'Urville Sea to the representation of tides and ocean-ice shelf interactions during the years 2010-2015. We show that the ice shelves off Adélie Land are highly sensitive to tidal forcing, with a significant basal melt increase in the presence of tides. Ice shelf basal melt freshens and cools the ocean over significant portions of the coastal seas at the depth of the ice shelf draft. An opposite warming and increase in salinity are found in the upper layers. The influence of ice shelf basal melt on the ocean is largely increased in the presence of tides. However, the production of sea ice is found to be mostly unaffected by these two processes. Water mass transport out of polynyas and ice shelf cavities are then investigated, together with their sensitivity to tides and ocean-ice shelf interactions. Ice shelf basal melt impacts the volume of dense waters in two ways: (1) Dense Shelf Water and Modified Shelf Water are consumed to form water masses of intermediate density inside the ice shelf cavities, and (2) the freshening of the ocean subsurface makes its transformation into dense water by sea ice formation more difficult. These results suggest that ice shelf basal melt variability can explain part of the observed changes of dense water properties, and may also affect the production of dense water in a future climate.

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Atmospheric drivers of a winter-to-spring Lagrangian sea-ice drift in the Eastern Antarctic marginal ice zone

et al. 2022

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Sea-ice drift in the Antarctic marginal ice zone (MIZ) is discussed using data from a 4-month-long drift of a buoy deployed on a pancake ice floe during the winter sea-ice expansion. We demonstrate increased meandering and drift speeds, and changes in the dynamical regimes of the absolute dispersion during cyclone activity, together with high correlations between drift velocities and wind from atmospheric reanalyses. This indicates a dominant physical control of wind forcing on ice drift and the persistence of free-drift conditions. These conditions occurred despite the buoy remaining largely in >80% ice concentrations and at distances >200 km from the estimated ice edge. The drift is additionally characterised by a strong inertial signature at 13.47 h, which appears initiated by passing cyclones. A wavelet analysis of the buoy's velocity confirms that the momentum transfer from winds at the multi-day frequencies is due to atmospheric forcing, while the initiation of inertial oscillations of sea ice has been identified as the secondary effect. Propagating storm-generated waves may initiate inertial oscillations by increasing the mobility of floes and enhance the drag of the inertial current. This analysis indicates that the Antarctic MIZ in the Indian Ocean sector remains much wider and mobile, during austral winter-to-spring, than defined by sea-ice concentration.

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The Role of Tides in Ocean‐Ice Shelf Interactions in the Southwestern Weddell Sea

Cited by 21 publications

References 114 publications

Remote Control of Filchner‐Ronne Ice Shelf Melt Rates by the Antarctic Slope Current

Remote Control of Filchner‐Ronne Ice Shelf Melt Rates by the Antarctic Slope Current

Influence of ocean tides and ice shelves on ocean–ice interactions and dense shelf water formation in the D’Urville Sea, Antarctica

Atmospheric drivers of a winter-to-spring Lagrangian sea-ice drift in the Eastern Antarctic marginal ice zone

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