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3. Acceleration of the contribution of the Greenland and Antarctic ice sheets to sea level rise

Author

Rignot, E., Velicogna, I., van den Broeke, M. R, Monaghan, A., and Lenaerts, J. T. M

Subjects
mass-loss, Jakobshavn Isbrae, glaciers, velocity, snowfall, retreat, balance
Abstract

Ice sheet mass balance estimates have improved substantially in recent years using a variety of techniques, over different time periods, and at various levels of spatial detail. Considerable disparity remains between these estimates due to the inherent uncertainties of each method, the lack of detailed comparison between independent estimates, and the effect of temporal modulations in ice sheet surface mass balance. Here, we present a consistent record of mass balance for the Greenland and Antarctic ice sheets over the past two decades, validated by the comparison of two independent techniques over the last 8 years: one differencing perimeter loss from net accumulation, and one using a dense time series of time-variable gravity. We find excellent agreement between the two techniques for absolute mass loss and acceleration of mass loss. In 2006, the Greenland and Antarctic ice sheets experienced a combined mass loss of 475 ± 158 Gt/yr, equivalent to 1.3 ± 0.4 mm/yr sea level rise. Notably, the acceleration in ice sheet loss over the last 18 years was 21.9 ± 1 Gt/yr2 for Greenland and 14.5 ± 2 Gt/yr2 for Antarctica, for a combined total of 36.3 ± 2 Gt/yr2. This acceleration is 3 times larger than for mountain glaciers and ice caps (12 ± 6 Gt/yr2). If this trend continues, ice sheets will be the dominant contributor to sea level rise in the 21st century.

Published
2011

7. A 21 st Century Warming Threshold for Sustained Greenland Ice Sheet Mass Loss

Author

Sub Dynamics Meteorology, Marine and Atmospheric Research, Noël, B., van Kampenhout, L., Lenaerts, J. T. M., van de Berg, W. J., van den Broeke, M. R., Sub Dynamics Meteorology, Marine and Atmospheric Research, Noël, B., van Kampenhout, L., Lenaerts, J. T. M., van de Berg, W. J., and van den Broeke, M. R.

Published
2021

10. Observations of Buried Lake Drainage on the Antarctic Ice Sheet

Author

Dunmire, D., primary, Lenaerts, J. T. M., additional, Banwell, A. F., additional, Wever, N., additional, Shragge, J., additional, Lhermitte, S., additional, Drews, R., additional, Pattyn, F., additional, Hansen, J. S. S., additional, Willis, I. C., additional, Miller, J., additional, and Keenan, E., additional

Published
2020
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12. The Community Earth System Model Version 2 (CESM2)

Author

Danabasoglu, G., primary, Lamarque, J.‐F., additional, Bacmeister, J., additional, Bailey, D. A., additional, DuVivier, A. K. , additional, Edwards, J., additional, Emmons, L. K., additional, Fasullo, J., additional, Garcia, R., additional, Gettelman, A., additional, Hannay, C., additional, Holland, M. M., additional, Large, W. G., additional, Lauritzen, P. H., additional, Lawrence, D. M., additional, Lenaerts, J. T. M., additional, Lindsay, K., additional, Lipscomb, W. H., additional, Mills, M. J., additional, Neale, R., additional, Oleson, K. W., additional, Otto‐Bliesner, B., additional, Phillips, A. S., additional, Sacks, W., additional, Tilmes, S., additional, Kampenhout, L., additional, Vertenstein, M., additional, Bertini, A., additional, Dennis, J., additional, Deser, C., additional, Fischer, C., additional, Fox‐Kemper, B., additional, Kay, J. E., additional, Kinnison, D., additional, Kushner, P. J., additional, Larson, V. E., additional, Long, M. C., additional, Mickelson, S., additional, Moore, J. K., additional, Nienhouse, E., additional, Polvani, L., additional, Rasch, P. J., additional, and Strand, W. G., additional

Published
2020
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13. Extent of Low-accumulation 'Wind Glaze' Areas on the East Antarctic Plateau: Implications for Continental Ice Mass Balance

Author

Scambos, Theodore A, Frezzotti, Massimo, Haran, T, Bohlander, J, Lenaerts, J. T. M, Van Den Broeke, M. R, Jezek, K, Long, D, Urbini, S, Farness, K, Neumann, T, Albert, M, and Winther, J.-G

Subjects
Geosciences (General), Earth Resources And Remote Sensing
Abstract

Persistent katabatic winds form widely distributed localized areas of near-zero net surface accumulation on the East Antarctic ice sheet (EAIS) plateau. These areas have been called 'glaze' surfaces due to their polished appearance. They are typically 2-200 square kilometers in area and are found on leeward slopes of ice-sheet undulations and megadunes. Adjacent, leeward high-accumulation regions (isolated dunes) are generally smaller and do not compensate for the local low in surface mass balance (SMB). We use a combination of satellite remote sensing and field-gathered datasets to map the extent of wind glaze in the EAIS above 1500m elevation. Mapping criteria are derived from distinctive surface and subsurface characteristics of glaze areas resulting from many years of intense annual temperature cycling without significant burial. Our results show that 11.2 plus or minus 1.7%, or 950 plus or minus 143 x 10(exp 3) square kilometers, of the EAIS above 1500m is wind glaze. Studies of SMB interpolate values across glaze regions, leading to overestimates of net mass input. Using our derived wind-glaze extent, we estimate this excess in three recent models of Antarctic SMB at 46-82 Gt. The lowest-input model appears to best match the mean in regions of extensive wind glaze.

Published
2012
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15. Present and future near-surface wind climate of Greenland from high resolution regional climate modelling

Author

Gorter, W., van Angelen, J. H., Lenaerts, J. T M, van den Broeke, M. R., Sub Dynamics Meteorology, Marine and Atmospheric Research, Sub Dynamics Meteorology, and Marine and Atmospheric Research

Subjects
Atmospheric Science, Katabatic wind, geography, geography.geographical_feature_category, Greenland, Wind, Forcing (mathematics), Radiative forcing, Atmospheric sciences, Wind speed, Prevailing winds, Climatology, RACMO2/GR, Potential temperature, Environmental science, Climate model, Weibull, Ice sheet, Katabatic
Abstract

The present and twenty-first century near-surface wind climate of Greenland is presented using output from the regional atmospheric climate model RACMO2. The modelled wind variability and wind distribution compare favourably to observations from three automatic weather stations in the ablation zone of southwest Greenland. The Weibull shape parameter is used to classify the wind climate. High values (κ > 4) are found in northern Greenland, indicative of uniform winds and a dominant katabatic forcing, while lower values (κ < 3) are found over the ocean and southern Greenland, where the synoptic forcing dominates. Very high values of the shape parameter are found over concave topography where confluence strengthens the katabatic circulation, while very low values are found in a narrow band along the coast due to barrier winds. To simulate the future (2081-2098) wind climate RACMO2 was forced with the HadGEM2-ES general circulation model using a scenario of mid-range radiative forcing of +4.5 W m-2 by 2100. For the future simulated climate, the near-surface potential temperature deficit reduces in all seasons in regions where the surface temperature is below the freezing point, indicating a reduction in strength of the near-surface temperature inversion layer. This leads to a wind speed reduction over the central ice sheet where katabatic forcing dominates, and a wind speed increase over steep coastal topography due to counteracting effects of thermal and katabatic forcing. Thermally forced winds over the seasonally sea ice covered region of the Greenland Sea are reduced by up to 2.5 m s-1.

Published
2013

16. Meltwater produced by wind–albedo interaction stored in an East Antarctic ice shelf

Author

Lenaerts, J. T. M., Lhermitte, S., Drews, R., Ligtenberg, S. R. M., Berger, S., Helm, V., Smeets, C. J. P. P., Broeke, M. R. van den, van de Berg, W. J., van Meijgaard, E., Eijkelboom, M., Eisen, O., Pattyn, F., Lenaerts, J. T. M., Lhermitte, S., Drews, R., Ligtenberg, S. R. M., Berger, S., Helm, V., Smeets, C. J. P. P., Broeke, M. R. van den, van de Berg, W. J., van Meijgaard, E., Eijkelboom, M., Eisen, O., and Pattyn, F.

Abstract

Surface melt and subsequent firn air depletion can ultimately lead to disintegration of Antarctic ice shelves1,2 causing grounded glaciers to accelerate3 and sea level to rise. In the Antarctic Peninsula, foehn winds enhance melting near the grounding line4, which in the recent past has led to the disintegration of the most northerly ice shelves5,6. Here, we provide observational and model evidence that this process also occurs over an East Antarctic ice shelf, where meltwaterinduced firn air depletion is found in the grounding zone. Unlike the Antarctic Peninsula, where foehn events originate from episodic interaction of the circumpolar westerlies with the topography, in coastal East Antarctica high temperatures are caused by persistent katabatic winds originating from the ice sheet’s interior. Katabatic winds warm and mix the air as it flows downward and cause widespread snow erosion, explaining >3 K higher near-surface temperatures in summer and surface melt doubling in the grounding zone compared with its surroundings. Additionally, these winds expose blue ice and firn with lower surface albedo, further enhancing melt. The in situ observation of supraglacial flow and englacial storage of meltwater suggests that ice-shelf grounding zones in East Antarctica, like their Antarctic Peninsula counterparts, are vulnerable to hydrofracturing7.

Published
2017

17. Meltwater produced by wind-albedo interaction stored in an East Antarctic ice shelf

Author

Marine and Atmospheric Research, Sub Dynamics Meteorology, ESL General Section, Lenaerts, J. T. M., Lhermitte, S., Drews, R., Ligtenberg, S. R. M., Berger, S., Helm, V., Smeets, C. J. P. P., van den Broeke, M. R., van de Berg, W. J., van Meijgaard, E., Eijkelboom, M., Eisen, O., Pattyn, F., Marine and Atmospheric Research, Sub Dynamics Meteorology, ESL General Section, Lenaerts, J. T. M., Lhermitte, S., Drews, R., Ligtenberg, S. R. M., Berger, S., Helm, V., Smeets, C. J. P. P., van den Broeke, M. R., van de Berg, W. J., van Meijgaard, E., Eijkelboom, M., Eisen, O., and Pattyn, F.

Published
2017

18. A tipping point in refreezing accelerates mass loss of Greenland’s glaciers and ice caps

Author

Noël, B., Berg, W. J van de, Lhermitte, S., Wouters, B., Machguth, Horst, Howat, I., Citterio, M., Moholdt, G., Lenaerts, J. T. M., Broeke, M. R. van den, Noël, B., Berg, W. J van de, Lhermitte, S., Wouters, B., Machguth, Horst, Howat, I., Citterio, M., Moholdt, G., Lenaerts, J. T. M., and Broeke, M. R. van den

Abstract

Melting of the Greenland ice sheet (GrIS) and its peripheral glaciers and ice caps (GICs) contributes about 43% to contemporary sea level rise. While patterns of GrIS mass loss are well studied, the spatial and temporal evolution of GICs mass loss and the acting processes have remained unclear. Here we use a novel, 1 km surface mass balance product, evaluated against in situ and remote sensing data, to identify 1997 (±5 years) as a tipping point for GICs mass balance. That year marks the onset of a rapid deterioration in the capacity of the GICs firn to refreeze meltwater. Consequently, GICs runoff increases 65% faster than meltwater production, tripling the post-1997 mass loss to 36±16 Gt−1, or ∼14% of the Greenland total. In sharp contrast, the extensive inland firn of the GrIS retains most of its refreezing capacity for now, buffering 22% of the increased meltwater production. This underlines the very different response of the GICs and GrIS to atmospheric warming.

Published
2017

19. A tipping point in refreezing accelerates mass loss of Greenland’s glaciers and ice caps

Author

Noël, B, van de Berg, W J, Lhermitte, S, Wouters, B, Machguth, H, Howat, I, Citterio, M, Moholdt, G, Lenaerts, J T M, van den Broeke, M R, Noël, B, van de Berg, W J, Lhermitte, S, Wouters, B, Machguth, H, Howat, I, Citterio, M, Moholdt, G, Lenaerts, J T M, and van den Broeke, M R

Abstract

Melting of the Greenland ice sheet (GrIS) and its peripheral glaciers and ice caps (GICs) contributes about 43% to contemporary sea level rise. While patterns of GrIS mass loss are well studied, the spatial and temporal evolution of GICs mass loss and the acting processes have remained unclear. Here we use a novel, 1 km surface mass balance product, evaluated against in situ and remote sensing data, to identify 1997 (±5 years) as a tipping point for GICs mass balance. That year marks the onset of a rapid deterioration in the capacity of the GICs firn to refreeze meltwater. Consequently, GICs runoff increases 65% faster than meltwater production, tripling the post-1997 mass loss to 36±16 Gt-1, or ∼14% of the Greenland total. In sharp contrast, the extensive inland firn of the GrIS retains most of its refreezing capacity for now, buffering 22% of the increased meltwater production. This underlines the very different response of the GICs and GrIS to atmospheric warming.

Published
2017

20. Clouds enhance Greenland ice sheet meltwater runoff

Author

Van Tricht, K., Lhermitte, S., Lenaerts, J. T M, Gorodetskaya, I. V., L'Ecuyer, T. S., Noël, B., Van Den Broeke, M. R., Turner, D. D., Van Lipzig, N. P M, Marine and Atmospheric Research, and Marine and Atmospheric Research

Subjects
010504 meteorology & atmospheric sciences, Chemistry(all), Ice stream, Science, General Physics and Astronomy, Greenland ice sheet, Physics and Astronomy(all), 010502 geochemistry & geophysics, 01 natural sciences, Biochemistry, General Biochemistry, Genetics and Molecular Biology, Article, Cryosphere, Ice divide, Meltwater, 0105 earth and related environmental sciences, geography, Multidisciplinary, geography.geographical_feature_category, Biochemistry, Genetics and Molecular Biology(all), General Chemistry, Future sea level, Ice-sheet model, Oceanography, 13. Climate action, Climatology, Environmental science, Ice sheet, Genetics and Molecular Biology(all)
Abstract

The Greenland ice sheet has become one of the main contributors to global sea level rise, predominantly through increased meltwater runoff. The main drivers of Greenland ice sheet runoff, however, remain poorly understood. Here we show that clouds enhance meltwater runoff by about one-third relative to clear skies, using a unique combination of active satellite observations, climate model data and snow model simulations. This impact results from a cloud radiative effect of 29.5 (±5.2) W m−2. Contrary to conventional wisdom, however, the Greenland ice sheet responds to this energy through a new pathway by which clouds reduce meltwater refreezing as opposed to increasing surface melt directly, thereby accelerating bare-ice exposure and enhancing meltwater runoff. The high sensitivity of the Greenland ice sheet to both ice-only and liquid-bearing clouds highlights the need for accurate cloud representations in climate models, to better predict future contributions of the Greenland ice sheet to global sea level rise., Clouds play a pivotal role in the energy and mass balance of the Greenland ice sheet, thereby affecting its contribution to global sea-level rise. Here, using a combination of observations and model simulations, the authors show that clouds enhance Greenland ice sheet meltwater runoff by more than 30%.

Published
2016

23. Fate of the Atlantic Meridional Overturning Circulation: Strong decline under continued warming and Greenland melting

Author

Bakker, P., primary, Schmittner, A., additional, Lenaerts, J. T. M., additional, Abe‐Ouchi, A., additional, Bi, D., additional, van den Broeke, M. R., additional, Chan, W.‐L., additional, Hu, A., additional, Beadling, R. L., additional, Marsland, S. J., additional, Mernild, S. H., additional, Saenko, O. A., additional, Swingedouw, D., additional, Sullivan, A., additional, and Yin, J., additional

Published
2016
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24. Meltwater produced by wind–albedo interaction stored in an East Antarctic ice shelf

Author

Lenaerts, J. T. M., primary, Lhermitte, S., additional, Drews, R., additional, Ligtenberg, S. R. M., additional, Berger, S., additional, Helm, V., additional, Smeets, C. J. P. P., additional, Broeke, M. R. van den, additional, van de Berg, W. J., additional, van Meijgaard, E., additional, Eijkelboom, M., additional, Eisen, O., additional, and Pattyn, F., additional

Published
2016
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25. A New Regional Climate Model for POLAR‐CORDEX: Evaluation of a 30‐Year Hindcast with COSMO‐CLM2 Over Antarctica.

Author

Souverijns, N., Gossart, A., Demuzere, M., Lenaerts, J. T. M., Medley, B., Gorodetskaya, I. V., Vanden Broucke, S., and Lipzig, N. P. M.

Subjects
ATMOSPHERIC models, METEOROLOGICAL observations, CLIMATE research, SPECTRORADIOMETER
Abstract

Continent‐wide climate information over the Antarctic Ice Sheet (AIS) is important to obtain accurate information of present climate and reduce uncertainties of the ice sheet mass balance response and resulting global sea level rise to future climate change. In this study, the COSMO‐CLM2 Regional Climate Model is applied over the AIS and adapted for the specific meteorological and climatological conditions of the region. A 30‐year hindcast was performed and evaluated against observational records consisting of long‐term ground‐based meteorological observations, automatic weather stations, radiosoundings, satellite records, stake measurements and ice cores. Reasonable agreement regarding the surface and upper‐air climate is achieved by the COSMO‐CLM2 model, comparable to the performance of other state‐of‐the‐art climate models over the AIS. Meteorological variability of the surface climate is adequately simulated, and biases in the radiation and surface mass balance are small. The presented model therefore contributes as a new member to the COordinated Regional Downscaling EXperiment project over the AIS (POLAR‐CORDEX) and the CORDEX‐CORE initiative. Key Points: A long‐term integration with the COSMO‐CLM2 Regional Climate Model for the Antarctic is presentedClimate representation performance is comparable to state‐of‐the‐art modelsThe simulation is a contribution to CORDEX over Antarctica (POLAR‐CORDEX) and CORDEX‐CORE [ABSTRACT FROM AUTHOR]

Published
2019
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26. Clouds enhance Greenland ice sheet meltwater runoff

Author

Marine and Atmospheric Research, Van Tricht, K., Lhermitte, S., Lenaerts, J. T M, Gorodetskaya, I. V., L'Ecuyer, T. S., Noël, B., Van Den Broeke, M. R., Turner, D. D., Van Lipzig, N. P M, Marine and Atmospheric Research, Van Tricht, K., Lhermitte, S., Lenaerts, J. T M, Gorodetskaya, I. V., L'Ecuyer, T. S., Noël, B., Van Den Broeke, M. R., Turner, D. D., and Van Lipzig, N. P M

Published
2016

27. Fate of the Atlantic Meridional Overturning Circulation: Strong decline under continued warming and Greenland melting

Author

Bakker, P., Schmittner, A., Lenaerts, J. T. M., Abe-Ouchi, A., Bi, D., van den Broeke, M. R., Chan, W.-L., Hu, A., Beadling, R. L., Marsland, S. J., Mernild, S. H., Saenko, O. A., Swingedouw, D., Sullivan, A., Yin, J., Bakker, P., Schmittner, A., Lenaerts, J. T. M., Abe-Ouchi, A., Bi, D., van den Broeke, M. R., Chan, W.-L., Hu, A., Beadling, R. L., Marsland, S. J., Mernild, S. H., Saenko, O. A., Swingedouw, D., Sullivan, A., and Yin, J.

Abstract

The most recent Intergovernmental Panel on Climate Change assessment report concludes that the Atlantic Meridional Overturning Circulation (AMOC) could weaken substantially but is very unlikely to collapse in the 21st century. However, the assessment largely neglected Greenland Ice Sheet (GrIS) mass loss, lacked a comprehensive uncertainty analysis, and was limited to the 21st century. Here in a community effort, improved estimates of GrIS mass loss are included in multicentennial projections using eight state‐of‐the‐science climate models, and an AMOC emulator is used to provide a probabilistic uncertainty assessment. We find that GrIS melting affects AMOC projections, even though it is of secondary importance. By years 2090–2100, the AMOC weakens by 18% [−3%, −34%; 90% probability] in an intermediate greenhouse‐gas mitigation scenario and by 37% [−15%, −65%] under continued high emissions. Afterward, it stabilizes in the former but continues to decline in the latter to −74% [+4%, −100%] by 2290–2300, with a 44% likelihood of an AMOC collapse. This result suggests that an AMOC collapse can be avoided by CO2 mitigation.

Published
2016
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28. Constraining the recent mass balance of pine island and thwaites glaciers, west antarctica, with airborne observations of snow accumulation

Author

Medley, B., Joughin, I., Smith, B. E., Das, S. B., Steig, E. J., Conway, H., Gogineni, S., Lewis, C., Criscitiello, A. S., McConnell, J. R., Van Den Broeke, M. R., Lenaerts, J. T M, Bromwich, D. H., Nicolas, J. P., Leuschen, C., Sub Dynamics Meteorology, Marine and Atmospheric Research, Sub Dynamics Meteorology, and Marine and Atmospheric Research

Subjects
lcsh:GE1-350, Glacier ice accumulation, geography, geography.geographical_feature_category, 010504 meteorology & atmospheric sciences, Ice stream, lcsh:QE1-996.5, Accumulation zone, Glacier, Future sea level, Glacier morphology, 010502 geochemistry & geophysics, 01 natural sciences, lcsh:Geology, Glacier mass balance, 13. Climate action, Climatology, Cryosphere, lcsh:Environmental sciences, Geology, 0105 earth and related environmental sciences, Water Science and Technology, Earth-Surface Processes
Abstract

In Antarctica, uncertainties in mass input and output translate directly into uncertainty in glacier mass balance and thus in sea level impact. While remotely sensed observations of ice velocity and thickness over the major outlet glaciers have improved our understanding of ice loss to the ocean, snow accumulation over the vast Antarctic interior remains largely unmeasured. Here, we show that an airborne radar system, combined with ice-core glaciochemical analysis, provide the means necessary to measure the accumulation rate at the catchment-scale along the Amundsen Sea coast of West Antarctica. We used along-track radar-derived accumulation to generate a 1985–2009 average accumulation grid that resolves moderate- to large-scale features (>25 km) over the Pine Island–Thwaites glacier drainage system. Comparisons with estimates from atmospheric models and gridded climatologies generally show our results as having less accumulation in the lower-elevation coastal zone but greater accumulation in the interior. Ice discharge, measured over discrete time intervals between 1994 and 2012, combined with our catchment-wide accumulation rates provide an 18-year mass balance history for the sector. While Thwaites Glacier lost the most ice in the mid-1990s, Pine Island Glacier's losses increased substantially by 2006, overtaking Thwaites as the largest regional contributor to sea-level rise. The trend of increasing discharge for both glaciers, however, appears to have leveled off since 2008.

Published
2014

29. Improved representation of East Antarctic surface mass balance in a regional atmospheric climate model

Author

Van Wessem, J. M., Reijmer, C. H., Morlighem, M., Mouginot, J., Rignot, E., Medley, B., Joughin, I., Wouters, B., Depoorter, M. A., Bamber, J. L., Lenaerts, J. T M, Van De Berg, W. J., Van Den Broeke, M. R., Van Meijgaard, E., Sub Dynamics Meteorology, Marine and Atmospheric Research, Sub Dynamics Meteorology, and Marine and Atmospheric Research

Subjects
geography, Ice cloud, geography.geographical_feature_category, Atmosphere/ice/ocean interactions, 010504 meteorology & atmospheric sciences, Surface mass budget, Antarctic ice sheet, Future sea level, 010502 geochemistry & geophysics, Atmospheric sciences, Ice and climate, 01 natural sciences, Glacier mass balance, Ice velocity, Accumulation, Climatology, Sea ice, Cryosphere, Climate model, Ice sheet, Geology, 0105 earth and related environmental sciences, Earth-Surface Processes
Abstract

This study evaluates the impact of a recent upgrade in the physics package of the regional atmospheric climate model RACMO2 on the simulated surface mass balance (SMB) of the Antarctic ice sheet. The modelled SMB increases, in particular over the grounded ice sheet of East Antarctica (+44 Gt a–1), with a small change in West Antarctica. This mainly results from an increase in precipitation, which is explained by changes in the cloud microphysics, including a new parameterization for ice cloud supersaturation, and changes in large-scale circulation patterns, which alter topographically forced precipitation. The spatial changes in SMB are evaluated using 3234 in situ SMB observations and ice-balance velocities, and the temporal variability using GRACE satellite retrievals. The in situ observations and balance velocities show a clear improvement of the spatial representation of the SMB in the interior of East Antarctica, which has become considerably wetter. No improvements are seen for West Antarctica and the coastal regions. A comparison of model SMB temporal variability with GRACE satellite retrievals shows no significant change in performance.

Published
2014

30. A New Regional Climate Model for POLAR‐CORDEX: Evaluation of a 30‐Year Hindcast with COSMO‐CLM2Over Antarctica

Author

Souverijns, N., Gossart, A., Demuzere, M., Lenaerts, J. T. M., Medley, B., Gorodetskaya, I. V., Vanden Broucke, S., and Lipzig, N. P. M.

Abstract

Continent‐wide climate information over the Antarctic Ice Sheet (AIS) is important to obtain accurate information of present climate and reduce uncertainties of the ice sheet mass balance response and resulting global sea level rise to future climate change. In this study, the COSMO‐CLM2Regional Climate Model is applied over the AIS and adapted for the specific meteorological and climatological conditions of the region. A 30‐year hindcast was performed and evaluated against observational records consisting of long‐term ground‐based meteorological observations, automatic weather stations, radiosoundings, satellite records, stake measurements and ice cores. Reasonable agreement regarding the surface and upper‐air climate is achieved by the COSMO‐CLM2model, comparable to the performance of other state‐of‐the‐art climate models over the AIS. Meteorological variability of the surface climate is adequately simulated, and biases in the radiation and surface mass balance are small. The presented model therefore contributes as a new member to the COordinated Regional Downscaling EXperiment project over the AIS (POLAR‐CORDEX) and the CORDEX‐CORE initiative. A long‐term integration with the COSMO‐CLM2 Regional Climate Model for the Antarctic is presentedClimate representation performance is comparable to state‐of‐the‐art modelsThe simulation is a contribution to CORDEX over Antarctica (POLAR‐CORDEX) and CORDEX‐CORE

Published
2019
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31. Empirical estimation of present-day Antarctic glacial isostatic adjustment and ice mass change

Author

Marine and Atmospheric Research, Sub Dynamics Meteorology, Gunter, B. C., Didova, O., Riva, R. E. M., Ligtenberg, S. R. M., Lenaerts, J. T. M., King, M. A., van den Broeke, Michiel, Urban, T., Marine and Atmospheric Research, Sub Dynamics Meteorology, Gunter, B. C., Didova, O., Riva, R. E. M., Ligtenberg, S. R. M., Lenaerts, J. T. M., King, M. A., van den Broeke, Michiel, and Urban, T.

Published
2014

32. Constraining the recent mass balance of pine island and thwaites glaciers, west antarctica, with airborne observations of snow accumulation

Author

Sub Dynamics Meteorology, Marine and Atmospheric Research, Medley, B., Joughin, I., Smith, B. E., Das, S. B., Steig, E. J., Conway, H., Gogineni, S., Lewis, C., Criscitiello, A. S., McConnell, J. R., Van Den Broeke, M. R., Lenaerts, J. T M, Bromwich, D. H., Nicolas, J. P., Leuschen, C., Sub Dynamics Meteorology, Marine and Atmospheric Research, Medley, B., Joughin, I., Smith, B. E., Das, S. B., Steig, E. J., Conway, H., Gogineni, S., Lewis, C., Criscitiello, A. S., McConnell, J. R., Van Den Broeke, M. R., Lenaerts, J. T M, Bromwich, D. H., Nicolas, J. P., and Leuschen, C.

Published
2014

34. Improved representation of East Antarctic surface mass balance in a regional atmospheric climate model

Author

Sub Dynamics Meteorology, Marine and Atmospheric Research, Van Wessem, J. M., Reijmer, C. H., Morlighem, M., Mouginot, J., Rignot, E., Medley, B., Joughin, I., Wouters, B., Depoorter, M. A., Bamber, J. L., Lenaerts, J. T M, Van De Berg, W. J., Van Den Broeke, M. R., Van Meijgaard, E., Sub Dynamics Meteorology, Marine and Atmospheric Research, Van Wessem, J. M., Reijmer, C. H., Morlighem, M., Mouginot, J., Rignot, E., Medley, B., Joughin, I., Wouters, B., Depoorter, M. A., Bamber, J. L., Lenaerts, J. T M, Van De Berg, W. J., Van Den Broeke, M. R., and Van Meijgaard, E.

Published
2014

37. Constraining the recent mass balance of Pine Island and Thwaites glaciers, West Antarctica with airborne observations of snow accumulation

Author

Medley, B., primary, Joughin, I., additional, Smith, B. E., additional, Das, S. B., additional, Steig, E. J., additional, Conway, H., additional, Gogineni, S., additional, Lewis, C., additional, Criscitiello, A. S., additional, McConnell, J. R., additional, van den Broeke, M. R., additional, Lenaerts, J. T. M., additional, Bromwich, D. H., additional, Nicolas, J. P., additional, and Leuschen, C., additional

Published
2014
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43. Snowdrift climate of the Greenland ice sheet: modeling and observations

Author

Gorter, W., Broeke, Prof. dr. M. R. van den (Thesis Advisor), Lenaerts, J. T. M., Gorter, W., Broeke, Prof. dr. M. R. van den (Thesis Advisor), and Lenaerts, J. T. M.

Abstract

Investigation of the Greenland wind and snowdrift climate using observational data from AWS and model data from RACMO2.

Published
2012

44. Modeling snowdrift sublimation on an Antarctic ice shelf

Author

Lenaerts, J. T. M., van den Broke, M. R., Déry, S. J., König-Langlo, Gert, Ettema, J., Kuipers-Munneke, P., Lenaerts, J. T. M., van den Broke, M. R., Déry, S. J., König-Langlo, Gert, Ettema, J., and Kuipers-Munneke, P.

Published
2009

47. Airborne‐radar and ice‐core observations of annual snow accumulation over Thwaites Glacier, West Antarctica confirm the spatiotemporal variability of global and regional atmospheric models

Author

Medley, B., primary, Joughin, I., additional, Das, S. B., additional, Steig, E. J., additional, Conway, H., additional, Gogineni, S., additional, Criscitiello, A. S., additional, McConnell, J. R., additional, Smith, B. E., additional, van den Broeke, M. R., additional, Lenaerts, J. T. M., additional, Bromwich, D. H., additional, and Nicolas, J. P., additional

Published
2013
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