The datasets are output from a flow-line model designed to estimate the age and surface origin for various ice bodies identified within hot-water drilled boreholes on Larsen C Ice Shelf (Hubbard et al., 2016, Ashmore et al., 2017). Two trajectories, based on remotely sensed velocities, allow surface fluxes from a regional climate model to be accumulated and advected down flow from selected points on the shelf. Vertical strain rates are taken into account, and surface mass balance is converted to thickness according to density profiles based on borehole data (Ashmore et al., 2017). The model output has a 250m horizontal resolution.
These data are part of a larger project. The flow-line model code, the SMB datasets, and the borehole density profiles are also available.
Funding was provided by the NERC grant NE/L005409/1.
Accumulation, Advection, Antarctica, Flow-line model, Ice shelf, Surface flux
|ISO Topic Categories:||
|Reference:||Ashmore, D.W., Hubbard, B., Luckman, A., Kulessa, B., Bevan, S., Booth, A., Kuipers Munneke, P., O'Leary, M., Sevestre, H. and Holland, P.R., 2017. Ice and firn heterogeneity within Larsen C Ice Shelf from borehole optical televiewing.
Bevan, S.L., Luckman, A., Hubbard B., Kulessa, B., Ashmore, D., Kuipers Munneke, P., O'Leary, M., Booth, A., Sevestre, H. and McGrath, D., 2017. Centuries of melt on Larsen C Ice Shelf. The Cryosphere Discussions. doi:10.5194/tc-2017-81
Hubbard, B., Luckman, A., Ashmore, D. W., Bevan, S., Kulessa, B., Kuipers Munneke, P., Philippe, M., Jansen, D., Booth, A., Sevestre, H., Tison, J.-L., O'Leary, M., Rutt, I., Jun. 2016. Massive subsurface ice formed by refreezing of ice-shelf melt ponds. Nature Communications 7, 11897+. URL http://dx.doi.org/10.1038/ncomms11897
|Quality:||Six output datasets are included. For each of two flowlines - the best estimate plus versions based on +10% (-10%) velocity magnitude combined with the lower (upper) quartile of mean SMB from 1979 to 2014.|
|Lineage:||The data are model output. The model is also available. Further details are in Bevan et al. (2017). V90, V100 and V110 refer to 90%, 100% and 110% input velocity magnitude. 75pc, med and 25pc refer to lower quartile, median and upper quartile of the surface mass flux estimate.
|Data Set Creator||Bevan,S; Luckman,A|
|Data Set Title||Flow-line model results for 2 trajectories on Larsen C Ice Shelf|
|Data Set Release Date||2017|
|Data Set Release Place||Polar Data Centre; British Antarctic Survey, NERC|
|Data Set Publisher||Polar Data Centre; British Antarctic Survey, NERC|
|Detailed Location||Trajectories on Larsen C Ice Shelf, from Cabinet and Whirlwind Inlets|
|Data Storage:||The data are ascii files of approximately 300KB.|
|Access Constraints:||No restrictions apply.|
|Use Constraints:||This data is governed by the NERC data policy http://www.nerc.ac.uk/research/sites/data/policy/ and supplied under Open Government Licence v.3 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/.|