Submitted as: development and technical paper
01 Aug 2022
Submitted as: development and technical paper | 01 Aug 2022
Status: this preprint is currently under review for the journal GMD.

Barotropic Tides in MPAS-Ocean: Impact of Ice Shelf Cavities

Nairita Pal1, Kristin Nicole Barton2, Mark Roger Petersen1, Steven Richard Brus3, Darren Engwirda1, Brian K. Arbic2, Andrew Frank Roberts1, Joannes J. Westerink4, and Damrongsak Wiraset4 Nairita Pal et al.
  • 1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 2University of Michigan, Ann Arbor, MI, USA
  • 3Argonne National Laboratory, Lemont IL 60439, USA
  • 4University of Notre Dame, 156 Fitzpatrick Hall, Notre Dame, IN, USA

Abstract. Oceanic tides are seldom represented in Earth System Models (ESMs) owing to the need for high horizontal resolution to accurately represent the associated barotropic waves close to coasts. This paper presents results of tides implemented in the Model for Prediction Across Scales–Ocean or MPAS-Ocean, which is the ocean component within the US Department of Energy developed Energy Exascale Earth System Model (E3SM). MPAS-Ocean circumvents the limitation of low resolution using unstructured global meshing. We are at this stage simulating the largest semidiurnal (M2, S2, N2) and diurnal (K1, O1) tidal constituents in a single layer version of MPAS-O. First, we show that the tidal constituents calculated using MPAS-Ocean closely agree with TPXO8 results when suitably tuned topographic wave drag and bottom drag coefficients are employed. Thereafter, we present the sensitivity of global tidal evolution due to the presence of Antarctic ice shelf cavities. The effect of ice shelves on the amplitude and phase of tidal constituents are presented. Lower values of complex errors (with respect to TPX08 results) for the M2 tidal constituents are observed when ice shelf is added in the simulations, with particularly strong improvement in the Southern Ocean. Our work points towards future research with varying Antarctic ice shelf geometries and sea ice coupling that might lead to better comparison and prediction of tides, and thus better prediction of sea-level rise and also the future climate variability.

Nairita Pal et al.

Status: open (until 26 Sep 2022)

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Nairita Pal et al.

Nairita Pal et al.


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Short summary
Understanding tides is essential to accurately predict ocean currents. Over the next several decades coastal processes such as flooding, erosion will be severely impacted due to climate change. Tides affect currents along the coastal regions the most. In this manuscript we show the results of implementing tides in a global ocean model known as MPAS–Ocean. We also show how Antarctic ice shelf cavities affect global tides. Our work points towards future research with tides-ice interactions.