The highest rates of Antarctic glacial ice mass loss are occurring to the west of the Antarctica Peninsula in regions where warming of subsurface continental shelf waters is also largest. However, the physical mechanisms responsible for this warming remain unknown. Here we show how localized changes in coastal winds off East Antarctica can produce significant subsurface temperature anomalies (>2 °C) around much of the continent. We demonstrate how coastal-trapped barotropic Kelvin waves communicate the wind disturbance around the Antarctic coastline. The warming is focused on the western flank of the Antarctic Peninsula because the circulation induced by the coastal-trapped waves is intensified by the steep continental slope there, and because of the presence of pre-existing warm subsurface water offshore. The adjustment to the coastal-trapped waves shoals the subsurface isotherms and brings warm deep water upwards onto the continental shelf and closer to the coast. This result demonstrates the vulnerability of the West Antarctic region to a changing climate.
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Hay, C., Morrow, E., Kopp, R. & Mitrovica, J. Probabilistic reanalysis of twentieth-century sea-level rise. Nature 517, 481–484 (2015).
Hock, R., de Woul, M., Radic, V. & Dyurgerov, M. Mountain glaciers and ice caps around Antarctica make a large sea-level rise contribution. Geophys. Res. Lett. 36, L07501 (2009).
Harig, C. & Simon, F. Accelerated West Antarctic ice mass loss continues to outpace Antarctic gains. Earth Planet. Sci. Lett. 415, 134–141 (2015).
Li, X., Rignot, E., Morlighem, M., Mouginot, J. & Scheuchl, B. Grounding line retreat of Totten Glacier East Antarctica. 1996–2013. Geophys. Res. Lett. 42, 8049–8056 (2015).
Rignot, E. & Jacobs, S. Rapid bottom melting widespread near Antarctic ice sheet grounding lines. Science 296, 2020–2023 (2002).
Rignot, E., Jacobs, S., Mouginot, J. & Scheule, B. Ice-shelf melting around Antarctica. Science 341, 266–270 (2013).
Schmidtko, S., Heywood, K., Thompson, A. & Aoki, S. Multidecadal warming of Antarctic waters. Science 346, 1227–1231 (2014).
Church, J. A. et al. Climate Change 2013: The Physical Science Basis (eds Stocker, T. F. et al.) Ch. 13 (IPCC, Cambridge Univ. Press, 2013).
Joughin, I., Smith, B. E. & Medley, B. Marine ice sheet collapse potentially under way for the Thwaites Glacier Basin. West Antarctica. Science 344, 735–738 (2014).
Favier, L. et al. Retreat of Pine Island Glacier controlled by marine ice-sheet instability. Nat. Clim. Change 4, 117–121 (2014).
DeConto, R. & Pollard, D. Contribution of Antarctica to past and future sea-level rise. Nature 531, 591–597 (2016).
Jacobs, S. S. On the nature and significance of the Antarctic Slope Front. Mar. Chem. 35, 9–24 (1991).
Rignot, E. et al. Recent Antarctic ice mass loss from radar interferometry and regional climate modeling. Nat. Geosci. 1, 106–110 (2008).
Cook, A. et al. Ocean forcing of glacier retreat in the western Antarctic Peninsula. Science 353, 283–285 (2016).
Thompson, D. W. & Solomon, S. Interpretation of recent Southern Hemisphere climate change. Science 296, 895–899 (2002).
Martinson, D., Stammerjohn, S., Iannuzzi, R., Smith, R. & Vernet, M. Western Antarctic Peninsula physical oceanography and spatio-temporal variability. Deep-Sea Res. II 55, 1964–1987 (2008).
Spence, P. et al. Rapid subsurface warming and circulation changes of Antarctic coastal waters by poleward shifting winds. Geophys. Res. Lett. 41, 4601–4610 (2014).
Nøst, O. A. et al. Eddy overturning of the Antarctic Slope Front controls glacial melting in the Eastern Weddell Sea. J. Geophys. Res. 116, C11014 (2011).
Stewart, A. & Thompson, A. Connecting Antarctic cross-slope exchange with Southern Ocean overturning. J. Phys. Oceanogr. 43, 1453–1471 (2013).
Flexas, M. et al. Role of tides on the formation of the Antarctic Slope Front at the Weddell-Scotia Confluence. J. Geophys. Res. 120, 3658–3680 (2015).
Zheng, F., Li, J., Clark, R. & Nnamchi, H. Simulation and projection of the Southern Hemisphere Annular Mode in CMIP5 models. J. Clim. 26, 9860–9879 (2013).
Rhines, P. B. Edge-, bottom-, and Rossby waves in a rotating stratified fluid. Geophys. Fluid Dyn. 1, 273–302 (1970).
Rhines, P. & Bretherton, F. Topographic Rossby waves in a rough-bottomed ocean. J. Fluid Mech. 61, 583–607 (1973).
Wang, D. & Mooers, C. Coastal-trapped waves in a continuously stratified ocean. J. Phys. Oceanogr. 6, 853–856 (1976).
Hallberg, R. Using a resolution function to regulate parameterizations of oceanic mesoscale eddy effects. Ocean Modell. 72, 92–103 (2013).
Chelton, D. et al. Geographical variability of the first baroclinic Rossby radius of deformation. J. Phys. Oceanogr. 28, 433–460 (1998).
Schwab, D. J. & Beletsky, D. Propagation of Kelvin waves along irregular coastlines in finite-difference models. Adv. Water Resour. 22, 239–245 (1998).
Kusahara, K. & Ohshima, K. Kelvin waves around Antarctica. J. Phys. Oceanogr. 44, 2909–2920 (2014).
Mazloff, M. R., Heimbach, P. & Wunsch, C. An eddy-permitting Southern Ocean state estimate. J. Phys. Oceanogr. 40, 880–899 (2010).
Moffat, C., Owens, B. & Beardsley, R. On the characteristics of Circumpolar Deep Water intrusions to the west Antarctic Peninsula shelf. J. Geophys. Res. 114, C05017 (2009).
Chipman, D. W. et al. Carbon Dioxide, Hydrographic, and Chemical Data Obtained During the R/V Akademik Ioffe Cruise in the South Pacific Ocean (Oak Ridge National Laboratory, US Department of Energy, 1997); http://dx.doi.org/10.3334/CDIAC/otg.ndp063
MacCready, P. & Rhines, P. B. Buoyant inhibition of Ekman transport on a slope and its effect on stratified spin-up. J. Fluid Mech. 223, 631–666 (1991).
Wåhlin, A. et al. Some implications of Ekman layer dynamics for cross-shelf exchange in the Amundsen Sea. J. Phys. Oceanogr. 42, 1461–1474 (2012).
Hughes et al. Wind-driven transport fluctuations through Drake Passage: a southern mode. J. Phys. Ocean. 29, 1971–1992 (1999).
Karoly, D. J. Southern hemisphere circulation features associated with El Niño-Southern Oscillation events. J. Clim. 2, 1239–1252 (1989).
Jenkins et al. Decadal ocean forcing and Antarctic Ice Sheet response: lessons from the Amundsen Sea. Oceanography 29, 106–117 (2016).
Mathiot, P. et al. Sensitivity of coastal polynyas and high salinity shelf water production in the Ross Sea, Antarctica, to the atmospheric forcing. Ocean Dynam. 62, 701–723 (2012).
Dinniman, S., Klinck, J. & Smith, W. A model study of Circumpolar Deep Water on the West Antarctic Peninsula and Ross Sea continental shelves. Deep-Sea Res. II 58, 1508–1523 (2011).
Hellmer, H. H., Kauker, F., Timmermann, R., Determann, J. & Rae, J. Twenty-first-century warming of a large Antarctic ice-shelf cavity by a redirected coastal current. Nature 485, 225–228 (2012).
Large, W. G. & Yeager, S. The global climatology of an inter-annually varying air-sea flux data set. Clim. Dynam. 33, 341–364 (2009).
Dong, J., Speer, K. & Jullion, L. The Antarctic slope current near 30° E. Geophys. Res. Lett. 121, 1051–1062 (2016).
Chavanne, C. P., Heywood, K., Nicholls, K. & Fer, I. Observations of the Antarctic Slope Undercurrent in the southeastern Weddell Sea. Geophys. Res. Lett. 37, L13601 (2010).
Griffies, S. M. et al. Impacts on ocean heat from transient mesoscale eddies in a hierarchy of climate models. J. Clim. 28, 952–977 (2015).
Delworth, T. L. et al. Simulated climate and climate change in the GFDL CM2.5 high-resolution coupled climate model. J. Clim. 25, 2755–2781 (2012).
Stewart, K. et al. Vertical resolution of baroclinic modes in global ocean models. Ocean Model. 113, 50–65 (2017).
Shchepetkin, A. & McWilliams, J. The regional oceanic modeling system (ROMS): a split-explicit, free surface, topography following-coordinate oceanic model. Ocean Model. 9, 347–401.
This research was undertaken on the National Computational Infrastructure (NCI) in Canberra, Australia, which is supported by the Australian Commonwealth Government. Thanks to S. Ramsden and the NCI Vizlab for helping with the schematic in Fig. 5. Thanks to NOAA/GFDL for helping with model developments. Thanks to N. Jourdain for providing Supplementary Fig. 1 and helpful comments. Thanks to E. Bergkamp for investigating baroclinic modes in idealized simulations and to O. Saenko, J. Le Sommer, A. Stewart, J. Fyke, R. Hallberg, C. Dufour, G. Marques and P. Goddard for helpful comments. P.S. was supported by an Australian Research Council (ARC) DECRA Fellowship DE150100223, A.M.H. by an ARC Future Fellowship FT120100842 and M.H.E. by an ARC Laureate Fellowship FL100100214 and R.M.H. by an ARC Discovery Project DP150101331.
The authors declare no competing financial interests.
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Spence, P., Holmes, R., Hogg, A. et al. Localized rapid warming of West Antarctic subsurface waters by remote winds. Nature Clim Change 7, 595–603 (2017). https://doi.org/10.1038/nclimate3335
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