Articles | Volume 14, issue 7
https://doi.org/10.5194/tc-14-2205-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-14-2205-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
13 Jul 2020
Research article |
| 13 Jul 2020
| 13 Jul 2020
Impact of West Antarctic ice shelf melting on Southern Ocean hydrography
Yoshihiro Nakayama
CORRESPONDING AUTHOR
Institute of Low Temperature Science, Hokkaido University, Sapporo, Japan
Alfred Wegener Institute, Bremerhaven, Germany
Ralph Timmermann
Alfred Wegener Institute, Bremerhaven, Germany
Hartmut H. Hellmer
Alfred Wegener Institute, Bremerhaven, Germany
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Ice shelves in the Amundsen Sea are thinning rapidly as ocean currents bring warm water into cavities beneath the floating ice. We use 2-year-long mooring records and 16-year-long model simulations to describe the hydrography and circulation near the ice front between Siple and Carney Islands. We find that temperatures here are lower than at neighboring ice fronts and that the transport of heat toward the cavity is governed by wind stress over the Amundsen Sea continental shelf.
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High ice shelf melting in the Amundsen Sea has attracted many observational campaigns in the past decade. One method to combine observations with numerical models is the adjoint method. After 20 iterations, the cost function, defined as a sum of the weighted model–data difference, is reduced by 65 % by adjusting initial conditions, atmospheric forcing, and vertical diffusivity. This study demonstrates adjoint-method optimization with explicit representation of ice shelf cavity circulation.
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Vår Dundas, Elin Darelius, Kjersti Daae, Nadine Steiger, Yoshihiro Nakayama, and Tae-Wan Kim
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Ice shelves in the Amundsen Sea are thinning rapidly as ocean currents bring warm water into cavities beneath the floating ice. We use 2-year-long mooring records and 16-year-long model simulations to describe the hydrography and circulation near the ice front between Siple and Carney Islands. We find that temperatures here are lower than at neighboring ice fronts and that the transport of heat toward the cavity is governed by wind stress over the Amundsen Sea continental shelf.
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High ice shelf melting in the Amundsen Sea has attracted many observational campaigns in the past decade. One method to combine observations with numerical models is the adjoint method. After 20 iterations, the cost function, defined as a sum of the weighted model–data difference, is reduced by 65 % by adjusting initial conditions, atmospheric forcing, and vertical diffusivity. This study demonstrates adjoint-method optimization with explicit representation of ice shelf cavity circulation.
Kaitlin A. Naughten, Katrin J. Meissner, Benjamin K. Galton-Fenzi, Matthew H. England, Ralph Timmermann, Hartmut H. Hellmer, Tore Hattermann, and Jens B. Debernard
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MetROMS and FESOM are two ocean/sea-ice models which resolve Antarctic ice-shelf cavities and consider thermodynamics at the ice-shelf base. We simulate the period 1992–2016 with both models, and with two options for resolution in FESOM, and compare output from the three simulations. Ice-shelf melt rates, sub-ice-shelf circulation, continental shelf water masses, and sea-ice processes are compared and evaluated against available observations.
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A coupled model has been developed to study the interaction between the ocean and the Antarctic ice sheet. Simulations for present-day climate yield realistic ice-shelf melt rates and a grounding line position close to the observed state. In a warm-water-inflow scenario, the model suggests a substantial thinning of the ice shelf and a local retreat of the grounding line. The coupled model yields a stronger increase in ice-shelf basal melt rates than a fixed-geometry control experiment.
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Janin Schaffer, Ralph Timmermann, Jan Erik Arndt, Steen Savstrup Kristensen, Christoph Mayer, Mathieu Morlighem, and Daniel Steinhage
Earth Syst. Sci. Data, 8, 543–557, https://doi.org/10.5194/essd-8-543-2016, https://doi.org/10.5194/essd-8-543-2016, 2016
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The RTopo-2 data set provides consistent maps of global ocean bathymetry and ice surface topographies for Greenland and Antarctica at 30 arcsec grid spacing. We corrected data from earlier products in the areas of Petermann, Hagen Bræ, and Helheim glaciers, incorporated original data for the floating ice tongue of Nioghalvfjerdsfjorden Glacier, and applied corrections for the geometry of Getz, Abbot, and Fimbul ice shelf cavities. The data set is available from the PANGAEA database.
S. L. Cornford, D. F. Martin, A. J. Payne, E. G. Ng, A. M. Le Brocq, R. M. Gladstone, T. L. Edwards, S. R. Shannon, C. Agosta, M. R. van den Broeke, H. H. Hellmer, G. Krinner, S. R. M. Ligtenberg, R. Timmermann, and D. G. Vaughan
The Cryosphere, 9, 1579–1600, https://doi.org/10.5194/tc-9-1579-2015, https://doi.org/10.5194/tc-9-1579-2015, 2015
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We used a high-resolution ice sheet model capable of resolving grounding line dynamics (BISICLES) to compute responses of the major West Antarctic ice streams to projections of ocean and atmospheric warming. This is computationally demanding, and although other groups have considered parts of West Antarctica, we think this is the first calculation for the whole region at the sub-kilometer resolution that we show is required.
S. Danilov, Q. Wang, R. Timmermann, N. Iakovlev, D. Sidorenko, M. Kimmritz, T. Jung, and J. Schröter
Geosci. Model Dev., 8, 1747–1761, https://doi.org/10.5194/gmd-8-1747-2015, https://doi.org/10.5194/gmd-8-1747-2015, 2015
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Unstructured meshes allow multi-resolution modeling of ocean dynamics. Sea ice models formulated on unstructured meshes are a necessary component of ocean models intended for climate studies. This work presents a description of a finite-element sea ice model which is used as a component of a finite-element sea ice ocean circulation model. The principles underlying its design can be of interest to other groups pursuing ocean modelling on unstructured meshes.
A. Levermann, R. Winkelmann, S. Nowicki, J. L. Fastook, K. Frieler, R. Greve, H. H. Hellmer, M. A. Martin, M. Meinshausen, M. Mengel, A. J. Payne, D. Pollard, T. Sato, R. Timmermann, W. L. Wang, and R. A. Bindschadler
Earth Syst. Dynam., 5, 271–293, https://doi.org/10.5194/esd-5-271-2014, https://doi.org/10.5194/esd-5-271-2014, 2014
Q. Wang, S. Danilov, D. Sidorenko, R. Timmermann, C. Wekerle, X. Wang, T. Jung, and J. Schröter
Geosci. Model Dev., 7, 663–693, https://doi.org/10.5194/gmd-7-663-2014, https://doi.org/10.5194/gmd-7-663-2014, 2014
D. Olbers, H. H. Hellmer, and F. F. J. H. Buck
The Cryosphere Discuss., https://doi.org/10.5194/tcd-8-919-2014, https://doi.org/10.5194/tcd-8-919-2014, 2014
Revised manuscript has not been submitted
Related subject area
Discipline: Other | Subject: Ocean Interactions
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The melting of ice mélange, or dense packs of icebergs and sea ice in glacial fjords, can influence the water column by releasing cold fresh water deep under the ocean surface. However, direct observations of this process have remained elusive. We use measurements of ocean temperature, salinity, and velocity bookending an episodic ice mélange event to show that this meltwater input changes the density profile of a glacial fjord and has implications for understanding tidewater glacier change.
Matthew J. Hoffman, Carolyn Branecky Begeman, Xylar S. Asay-Davis, Darin Comeau, Alice Barthel, Stephen F. Price, and Jonathan D. Wolfe
The Cryosphere, 18, 2917–2937, https://doi.org/10.5194/tc-18-2917-2024, https://doi.org/10.5194/tc-18-2917-2024, 2024
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Kenneth G. Hughes
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Kazuya Kusahara, Daisuke Hirano, Masakazu Fujii, Alexander D. Fraser, Takeshi Tamura, Kohei Mizobata, Guy D. Williams, and Shigeru Aoki
The Cryosphere, 18, 43–73, https://doi.org/10.5194/tc-18-43-2024, https://doi.org/10.5194/tc-18-43-2024, 2024
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Karita Kajanto, Fiammetta Straneo, and Kerim Nisancioglu
The Cryosphere, 17, 371–390, https://doi.org/10.5194/tc-17-371-2023, https://doi.org/10.5194/tc-17-371-2023, 2023
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Many outlet glaciers in Greenland are connected to the ocean by narrow glacial fjords, where warm water melts the glacier from underneath. Ocean water is modified in these fjords through processes that are poorly understood, particularly iceberg melt. We use a model to show how iceberg melt cools down Ilulissat Icefjord and causes circulation to take place deeper in the fjord than if there were no icebergs. This causes the glacier to melt less and from a smaller area than without icebergs.
Yixi Zheng, David P. Stevens, Karen J. Heywood, Benjamin G. M. Webber, and Bastien Y. Queste
The Cryosphere, 16, 3005–3019, https://doi.org/10.5194/tc-16-3005-2022, https://doi.org/10.5194/tc-16-3005-2022, 2022
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New observations reveal the Thwaites gyre in a habitually ice-covered region in the Amundsen Sea for the first time. This gyre rotates anticlockwise, despite the wind here favouring clockwise gyres like the Pine Island Bay gyre – the only other ocean gyre reported in the Amundsen Sea. We use an ocean model to suggest that sea ice alters the wind stress felt by the ocean and hence determines the gyre direction and strength. These processes may also be applied to other gyres in polar oceans.
Mimmi Oksman, Anna Bang Kvorning, Signe Hillerup Larsen, Kristian Kjellerup Kjeldsen, Kenneth David Mankoff, William Colgan, Thorbjørn Joest Andersen, Niels Nørgaard-Pedersen, Marit-Solveig Seidenkrantz, Naja Mikkelsen, and Sofia Ribeiro
The Cryosphere, 16, 2471–2491, https://doi.org/10.5194/tc-16-2471-2022, https://doi.org/10.5194/tc-16-2471-2022, 2022
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One of the questions facing the cryosphere community today is how increasing runoff from the Greenland Ice Sheet impacts marine ecosystems. To address this, long-term data are essential. Here, we present multi-site records of fjord productivity for SW Greenland back to the 19th century. We show a link between historical freshwater runoff and productivity, which is strongest in the inner fjord – influenced by marine-terminating glaciers – where productivity has increased since the late 1990s.
Kazuya Kusahara, Daisuke Hirano, Masakazu Fujii, Alexander D. Fraser, and Takeshi Tamura
The Cryosphere, 15, 1697–1717, https://doi.org/10.5194/tc-15-1697-2021, https://doi.org/10.5194/tc-15-1697-2021, 2021
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We used an ocean–sea ice–ice shelf model with a 2–3 km horizontal resolution to investigate ocean–ice shelf/glacier interactions in Lützow-Holm Bay, East Antarctica. The numerical model reproduced the observed warm water intrusion along the deep trough in the bay. We examined in detail (1) water mass changes between the upper continental slope and shelf regions and (2) the fast-ice role in the ocean conditions and basal melting at the Shirase Glacier tongue.
Laura C. Gillard, Xianmin Hu, Paul G. Myers, Mads Hvid Ribergaard, and Craig M. Lee
The Cryosphere, 14, 2729–2753, https://doi.org/10.5194/tc-14-2729-2020, https://doi.org/10.5194/tc-14-2729-2020, 2020
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Greenland's glaciers in contact with the ocean drain the majority of the ice sheet (GrIS). Deep troughs along the shelf branch into fjords, connecting glaciers with ocean waters. The heat from the ocean entering deep troughs may then accelerate the mass loss. Onshore heat transport through troughs was investigated with an ocean model. Processes that drive the delivery of ocean heat respond differently by region to increasing GrIS meltwater, mean circulation, and filtering out of storms.
Anna J. Crawford, Derek Mueller, Gregory Crocker, Laurent Mingo, Luc Desjardins, Dany Dumont, and Marcel Babin
The Cryosphere, 14, 1067–1081, https://doi.org/10.5194/tc-14-1067-2020, https://doi.org/10.5194/tc-14-1067-2020, 2020
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Large tabular icebergs (
ice islands) are symbols of climate change as well as marine hazards. We measured thickness along radar transects over two visits to a 14 km2 Arctic ice island and left automated equipment to monitor surface ablation and thickness over 1 year. We assess variation in thinning rates and calibrate an ice–ocean melt model with field data. Our work contributes to understanding ice island deterioration via logistically complex fieldwork in a remote environment.
Oskar Glowacki and Grant B. Deane
The Cryosphere, 14, 1025–1042, https://doi.org/10.5194/tc-14-1025-2020, https://doi.org/10.5194/tc-14-1025-2020, 2020
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Marine-terminating glaciers are shrinking rapidly in response to the warming climate and thus provide large quantities of fresh water to the ocean system. However, accurate estimates of ice loss at the ice–ocean boundary are difficult to obtain. Here we demonstrate that ice mass loss from iceberg break-off (calving) can be measured by analyzing the underwater noise generated as icebergs impact the sea surface.
Xiying Liu
The Cryosphere, 12, 3033–3044, https://doi.org/10.5194/tc-12-3033-2018, https://doi.org/10.5194/tc-12-3033-2018, 2018
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Numerical experiments have been performed to study the effect of basal melting of the Ross Ice Shelf on the ocean southward of 35° S. It is shown that the melt rate averaged over the entire Ross Ice Shelf is 0.253 m year-1, which is associated with a freshwater flux of 3150 m3 s-1. The extra freshwater flux decreases the salinity in the Southern Ocean substantially, leading to anomalies in circulation, sea ice, and heat transport in certain parts of the ocean.
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Aoki, S., Rintoul, S. R., Ushio, S., Watanabe, S., and Bindoff, N. L.:
Freshening of the Adélie Land Bottom water near 140∘ E,
Geophys. Res. Lett., 32, L23601, https://doi.org/10.1029/2005GL024246, 2005. a, b
Assmann, K., Jenkins, A., Shoosmith, D., Walker, D., Jacobs, S., and Nicholls,
K.: Variability of Circumpolar Deep Water transport onto the Amundsen
Sea continental shelf through a shelf break trough, J. Geophys. Res., 118,
6603–6620, 2013. a
Beckmann, A. and Timmermann, R.: Circumpolar influences on the Weddell Sea:
Indication of an Antarctic circumpolar coastal wave, J. Climate, 14,
3785–3792, 2001. a
Bintanja, R., Van Oldenborgh, G., Drijfhout, S., Wouters, B., and Katsman, C.: Important role for ocean warming and increased ice-shelf melt in Antarctic sea-ice expansion, Nat. Geosci., 6, 376–379, 2013. a
Cavalieri, D., Parkinson, C., Gloersen, P., and Zwally, H.: Sea ice
concentrations from Nimbus-7 SMMR and DMSP SSM/I
passive microwave data, January 1979–June, https://doi.org/10.5067/8GQ8LZQVL0VL, 2006. a
Dee, D. P., Uppala, S. M., Simmons, A. J., Berrisford, P., Poli, P.,
Kobayashi, S., Andrae, U., Balmaseda, M. A., Balsamo, G., Bauer, P.,
Bechtold, P., Beljaars, A. C. M., van de Berg, I., Biblot, J., Bormann, N.,
Delsol, C., Dragani, R., Fuentes, M., Greer, A. J., Haimberger, L., Healy, S.
B., Hersbach, H., Holm, E. V., Isaksen, L., Kallberg, P., Kohler, M.,
Matricardi, M., McNally, A. P., Mong-Sanz, B. M., Morcette, J.-J., Park,
B.-K., Peubey, C., de Rosnay, P., Tavolato, C., Thepaut, J. N., and Vitart,
F.: The ERA-Interim reanalysis: Configuration and performance of the data
assimilation system, Q. J. Roy. Meteorol. Soc., 137, 553–597, https://doi.org/10.1002/qj.828, 2011. a
Dutrieux, P., De Rydt, J., Jenkins, A., Holland, P. R., Ha, H. K., Lee, S. H., Steig, E. J., Ding, Q., Abrahamsen, E. P., and Schröder, M.: Strong sensitivity of Pine Island ice-shelf melting to climatic variability, Science, 343, 174–178, 2014. a
Ferrigno, J. G., Lucchitta, B. K., Mullins, K., Allison, A., Allen, R., and
Gould, W.: Velocity measurements and changes in position of Thwaites
Glacier/iceberg tongue from aerial photography, Landsat images and
NOAA AVHRR data, Ann. Glaciol., 17, 239–244, 1993. a
Golledge, N. R., Keller, E. D., Gomez, N., Naughten, K. A., Bernales, J.,
Trusel, L. D., and Edwards, T. L.: Global environmental consequences of
twenty-first-century ice-sheet melt, Nature, 566, 65–72, 2019. a
Hellmer, H. and Olbers, D.: A two-dimensional model for the thermohaline
circulation under an ice shelf, Antarct. Sci., 1, 325–336, 1989. a
Hillenbrand, C.-D., Smith, J. A., Hodell, D. A., Greaves, M., Poole, C. R.,
Kender, S., Williams, M., Andersen, T. J., Jernas, P. E., Elderfield, H.,
Klages, J. P., Roberts, S. J., Gohl, K., Larter, R. D., and Kuhn, G.: West Antarctic Ice Sheet retreat driven by Holocene warm
water incursions, Nature, 547, 43–48, 2017. a, b
Jacobs, S. S., Hellmer, H. H., and Jenkins, A.: Antarctic ice sheet melting in the Southeast Pacific, Geophys. Res. Lett., 23, 957–960, 1996. a
Jenkins, A., Dutrieux, P., Jacobs, S. S., McPhail, S. D., Perrett, J. R., Webb, A. T., and White, D.: Observations beneath Pine Island Glacier in
West Antarctica and implications for its retreat, Nat. Geosci., 3,
468–472, 2010a. a
Jenkins, A., Nicholls, K. W., and Corr, H. F.: Observation and parameterization of ablation at the base of Ronne Ice Shelf, Antarctica, J. Phys. Oceanogr., 40, 2298–2312, 2010b. a
Jenkins, A., Shoosmith, D., Dutrieux, P., Jacobs, S., Kim, T. W., Lee, S. H., Ha, H. K., and Stammerjohn, S.: West AntarcticIce Sheet retreat in the
Amundsen Sea driven by decadal oceanic variability, Nat. Geosci.,
11, 733–738, 2018. a
Kimura, S., Jenkins, A., Regan, H., Holland, P. R., Assmann, K. M., Whitt,
D. B., Van Wessem, M., van de Berg, W. J., Reijmer, C. H., and Dutrieux, P.:
Oceanographic Controls on the Variability of Ice-Shelf Basal Melting and
Circulation of Glacial Meltwater in the Amundsen Sea Embayment,
Antarctica, J. Geophys. Res.-Oceans, 122, 10131–10155,
2017. a
Kusahara, K. and Hasumi, H.: Modeling Antarctic ice shelf responses to future
climate changes and impacts on the ocean, J. Geophys. Res., 118, 2454–2475,
2013. a
Kusahara, K. and Hasumi, H.: Pathways of basal meltwater from Antarctic ice
shelves: A model study, J. Geophys. Res. Lett., 119, 5690–5704, 2014. a
Lago, V. and England, M. H.: Projected Slowdown of Antarctic Bottom
Water Formation in Response to Amplified Meltwater Contributions,
J. Climate, 32, 6319–6335, 2019. a
Lucchita, B. K. and Rosanova, C. E.: Velocities of Pine Island and
Thwaites glaciers, West Antarctica, from ERS-1 SAR images, European Space Agency, (Special Publication) ESA SP, 819–824,
1997. a
Mazloff, M. R., Heimbach, P., and Wunsch, C.: An eddy-permitting Southern
Ocean state estimate, J. Phys. Oceanogr., 40, 880–899, 2010. a
Nakayama, Y., Schröder, M., and Hellmer, H. H.: From Circumpolar Deep
Water to the glacial meltwater plume on the eastern Amundsen Shelf,
Deep Sea Res. Pt. I, 77, 50–62, 2013. a
Nakayama, Y., Timmermann, R., Schröder, M., and Hellmer, H.: On the
difficulty of modeling Circumpolar Deep Water intrusions onto the
Amundsen Sea continental shelf, Ocean Model., 84, 26–34,
2014b. a
Nakayama, Y., Menemenlis, D., Schodlok, M., and Rignot, E.: Amundsen and
Bellingshausen Seas simulation with optimized ocean, sea ice, and
thermodynamic ice shelf model parameters, J. Geophys. Res.-Oceans, 122, 6180–6195, 2017. a
Nakayama, Y., Menemenlis, D., Zhang, H., Schodlok, M., and Rignot, E.: Origin
of Circumpolar Deep Water intruding onto the Amundsen and
Bellingshausen Sea continental shelves, Nat. Commun., 9, 3403, https://doi.org/10.1038/s41467-018-05813-1,
2018. a
Nakayama, Y., Manucharyan, G., Zhang, H., Dutrieux, P., Torres, H. S., Klein,
P., Seroussi, H., Schodlok, M., Rignot, E., and Menemenlis, D.: Pathways of
ocean heat towards Pine Island and Thwaites grounding lines, Sci.
rep., 9, 1–9, 2019. a
Paolo, F. S., Fricker, H. A., and Padman, L.: Volume loss from Antarctic ice shelves is accelerating, Science, 348, 327–331, 2015. a
Pauling, A. G., Bitz, C. M., Smith, I. J., and Langhorne, P. J.: The response
of the Southern Ocean and Antarctic sea ice to freshwater from ice shelves in
an Earth system model, J. Climate, 29, 1655–1672, 2016. a
Renault, A., Provost, C., Sennéchael, N., Barré, N., and Kartavtseff,
A.: Two full-depth velocity sections in the Drake Passage in 2006 Transport
estimates, Deep-Sea Res. Pt. II, 58,
2572–2591, 2011. a
Rignot, E. J.: Fast recession of a West Antarctic glacier, Science, 281,
549–551, 1998. a
Rintoul, S. R.: Rapid freshening of Antarctic Bottom Water formed in the Indian and Pacific oceans, Geophys. Res. Lett., 34, L06606, https://doi.org/10.1029/2006GL028550, 2007. a, b
Schmidtko, S., Heywood, K. J., Thompson, A. F., and Aoki, S.: Multidecadal
warming of Antarctic waters, Science, 346, 1227–1231, 2014. a
Schodlok, M. P., Menemenlis, D., Rignot, E., and Studinger, M.: Sensitivity of the ice shelf ocean system to the sub-ice shelf cavity shape measured by
NASA IceBridge in Pine Island Glacier, West Antarctica,
Ann. Glaciol., 53, 156–162, 2012. a
Shean, D. E., Joughin, I. R., Dutrieux, P., Smith, B. E., and Berthier, E.: Ice shelf basal melt rates from a high-resolution digital elevation model (DEM) record for Pine Island Glacier, Antarctica, The Cryosphere, 13, 2633–2656, https://doi.org/10.5194/tc-13-2633-2019, 2019. a
Shepherd, A., Ivins, E., Geruo, A., Barletta, V., Bentley, M., Bettadpur, S.,
Briggs, K., Bromwich, D., Forsberg, R., Galin, N., Horwath, M., Jacobs, S., Joughin, I., King, M. A., Lenaerts, J. T. M., Li, J., Ligtenberg, S. R. M., Luckman, A., Luthcke, S. B., McMillan, M., Meister, R., Milne, G., Mouginot, J., Muir, A., Nicolas, J. P., Paden, J., Payne, A. J., Pritchard, H., Rignot, E., Rott, H., Sandberg, L., Scambos, T. A., Scheuchl, B., Schrama, E. J. O., Smith, B., Sundal, A. V., van Angelen, J. H., van de Berg, W. J., van den Broeke, M. R., Vaughan, D. G., Velicogna, I., Wahr, J., Whitehouse, P. L., Wingham, D. J., Yi, Do., Young, D., and Zwally, H. J.: A reconciled
estimate of ice-sheet mass balance, Science, 338, 1183–1189, 2012. a
Smith, J., Andersen, T. J., Shortt, M., Gaffney, A., Truffer, M., Stanton, T., Bindschadler, R., Dutrieux, P., Jenkins, A., Hillenbrand, C.-D., Ehrmann, W., Corr, H. F. J., Farley, N., Crowhurst, S., and Vaughan, D. G.:
Sub-ice-shelf sediments record history of twentieth-century retreat of Pine
Island Glacier, Nature, 541, 77–80, 2017. a, b
Spreen, G., Kaleschke, L., and Heygster, G.: Sea ice remote sensing using
AMSR-E 89-GHz channels, J. Geophys. Res.-Oceans, 113, C02S03, https://doi.org/10.1029/2005JC003384, 2008. a
St-Laurent, P., Klinck, J., and Dinniman, M.: Impact of local winter cooling on the melt of Pine Island Glacier, Antarctica, J. Geophys. Res.-Oceans, 120, 6718–6732, 2015. a
Steig, E. J., Ding, Q., White, J. W., Küttel, M., Rupper, S. B., Neumann,
T. A., Neff, P. D., Gallant, A. J., Mayewski, P. A., Taylor, K. C., Hoffmann, G., Dixon, D. A., Schoenemann, S. W., Markle, B. R., Fudge, T. J., Schneider, D. P., Schauer, A. J., Teel, R. P., Vaughn, B. H., Burgener, L., Williams, J., and Korotkikh, E.:
Recent climate and ice-sheet changes in West Antarctica compared with the
past 2,000 years, Nat. Geosci., 6, 372–375, 2013. a
Swart, N. and Fyfe, J.: The influence of recent Antarctic ice sheet retreat on simulated sea ice area trends, Geophys. Res. Lett., 40, 4328–4332,
2013. a
Thoma, M., Jenkins, A., Holland, D., and Jacobs, S.: Modelling Circumpolar
Deep Water intrusions on the Amundsen Sea continental shelf,
Antarctica, Geophys. Res. Lett., 35, L18602, https://doi.org/10.1029/2008GL034939, 2008. a
Timmermann, R., Danilov, S., Schröter, J., Böning, C., Sidorenko, D.,
and Rollenhagen, K.: Ocean circulation and sea ice distribution in a finite
element global sea ice–ocean model, Ocean Model., 27, 114–129, 2009. a
Timmermann, R., Le Brocq, A., Deen, T., Domack, E., Dutrieux, P., Galton-Fenzi, B., Hellmer, H., Humbert, A., Jansen, D., Jenkins, A., Lambrecht, A., Makinson, K., Niederjasper, F., Nitsche, F., Nøst, O. A., Smedsrud, L. H., and Smith, W. H. F.: A consistent data set of Antarctic ice sheet topography, cavity geometry, and global bathymetry, Earth Syst. Sci. Data, 2, 261–273, https://doi.org/10.5194/essd-2-261-2010, 2010. a
Turner, J., Comiso, J. C., Marshall, G. J., Lachlan-Cope, T. A., Bracegirdle,
T., Maksym, T., Meredith, M. P., Wang, Z., and Orr, A.: Non-annular
atmospheric circulation change induced by stratospheric ozone depletion and
its role in the recent increase of Antarctic sea ice extent, Geophys.
Res. Lett., 36, L08502, https://doi.org/10.1029/2009GL037524, 2009. a
Webber, B. G., Heywood, K. J., Stevens, D. P., Dutrieux, P., Abrahamsen, E. P., Jenkins, A., Jacobs, S. S., Ha, H. K., Lee, S. H., and Kim, T. W.: Mechanisms driving variability in the ocean forcing of Pine Island Glacier, Nat. Commun., 8, 14507, https://doi.org/10.1038/ncomms14507, 2017. a
Webber, B. G., Heywood, K. J., Stevens, D. P., and Assmann, K. M.: The impact
of overturning and horizontal circulation in Pine Island Trough on ice
shelf melt in the eastern Amundsen Sea, J. Phys. Oceanogr.,
49, 63–83, 2019. a
Short summary
Previous studies have shown accelerations of West Antarctic glaciers, implying that basal melt rates of these glaciers were small and increased in the middle of the 20th century. We conduct coupled sea ice–ice shelf–ocean simulations with different levels of ice shelf melting from West Antarctic glaciers. This study reveals how far and how quickly glacial meltwater from ice shelves in the Amundsen and Bellingshausen seas propagates downstream into the Ross Sea and along the East Antarctic coast.
Previous studies have shown accelerations of West Antarctic glaciers, implying that basal melt...
