1km Greenland data set
From Interactive System for Ice sheet Simulation
One kilo-meter resolution data set for Greenland
There is a one kilo-meter resolution data set for Greenland available for download by clicking here.
The data set is in NetCDF format and includes data for bedrock topography, ice thickness, air temperature, precipitation, basal heat flux, and the meta-data in the table below. The data is on a 1501 by 2801 grid with lower left hand corner at (-800 000, -3 400 000) and upper right hand corner (700 000, -600 000).
| GLOBAL ATTRIBUTES | |
| Title | Greenland 1 km Data Set |
| Creator | Glen D. Granzow |
| Institution | University of Montana |
| Date | 1 November 2010 * |
| Comments | The data in this file was interpolated onto a 1km grid using natural neighbor interpolation which is based on Delauney triangulation. This was accomplished using the function natgridd (see http://www.ncarg.ucar.edu//ngmath/natgrid/nnhome.html) from the National Center for Atmospheric Research (NCAR). Natgrid is part of the NCAR Command Language (NCL) package which can be downloaded via http://www.ncl.ucar.edu/Download/ |
| mapping | |
| ellipsoid | WGS84 |
| grid_mapping_name | polar_stereographic |
| latitude_of_projection_origin | 90 |
| standard_parallel | 71 |
| straight_vertical_longitude_from_pole | -39 |
| false_easting | 0 |
| false_northing | 0 |
| x | |
| long_name | Cartesian x-coordinate |
| standard_name | projection_x_coordinate |
| units | meters |
| y | |
| long_name | Cartesian y-coordinate |
| standard_name | projection_y_coordinate |
| units | meters |
| topg | |
| long_name | Bedrock Topography |
| standard_name | bedrock_altitude |
| units | meters |
| grid_mapping | mapping |
| source | [1] http://nsidc.org/data/nsidc-0092.html, [2] http://www.gebco.net/data_and_products/gridded_bathymetry_data/, [3] https://www.cresis.ku.edu/data/Greenland |
| reference | [1a] Bamber, J.L., R.L. Layberry, S.P. Gogenini. 2001. A new ice thickness and bed data set for the Greenland ice sheet 1: Measurement, data reduction, and errors. Journal of Geophysical Research 106 (D24): 33773-33780. [1b] Bamber, J.L., R.L. Layberry, S.P. Gogenini. 2001. A new ice thickness and bed data set for the Greenland ice sheet 2: Relationship between dynamics and basal topography. Journal of Geophysical Research 106 (D24): 33781-33788. |
| comments | The bedrock topography field incorporates (corrected) 5 km gridded data from the National Snow and Ice Data Center (NSIDC), bathymetric data and surface elevation data for Ellesmere Island from the General Bathymetric Chart of the Oceans (GEBCO), gridded data for the Jakobshavn and Pettermann Glacier regions from the Center for Remote Sensing of Ice Sheets (CReSIS), and flightline data for the Kangerdlugsuaq and Helheim Glacier regions also from CReSIS. Because of the large number of data points, interpolation onto the output grid (using natgridd's nonlinear natural neighbor algorithm) was performed in blocks to reduce the computing time required. The available flightline data was for ice thickness only; To calculate bed elevations from these thicknesses, the thicknesses were subtracted from surface elevations obtained using a bicubic spline of 5km gridded surface data from NSIDC. |
| thk | |
| long_name | Ice Thickness |
| standard_name | land_ice_thickness |
| units | meters |
| grid_mapping | mapping |
| source | [1] http://nsidc.org/data/nsidc-0092.html, [2] https://www.cresis.ku.edu/data/Greenland |
| reference | [1a] Bamber, J.L., R.L. Layberry, S.P. Gogenini. 2001. A new ice thickness and bed data set for the Greenland ice sheet 1: Measurement, data reduction, and errors. Journal of Geophysical Research 106 (D24): 33773-33780. [1b] Bamber, J.L., R.L. Layberry, S.P. Gogenini. 2001. A new ice thickness and bed data set for the Greenland ice sheet 2: Relationship between dynamics and basal topography. Journal of Geophysical Research 106 (D24): 33781-33788. |
| comments | The ice thickness field incorporates (corrected) 5 km gridded data from the National Snow and Ice Data Center (NSIDC), gridded data for the Jakobshavn and Pettermann Glacier regions from the Center for Remote Sensing of Ice Sheets (CReSIS), and flightline data for the Kangerdlugsuaq and Helheim Glacier regions also from CReSIS. Additional data points with zero thickness were introduced to smooth the ice margin but artifacts of the 5 km grid remain in some locations. Because of the large number of data points, interpolation onto the output grid (using natgridd's nonlinear natural neighbor algorithm) was performed in blocks to reduce the computing time required. The available data for the Jakobshavn Glacier region was for bed elevation only; To calculate thicknesses from these bed elevations, the bed elevations were subtracted from surface elevations obtained using a bicubic spline of 5km gridded surface data from NSIDC. |
| presartm | |
| long_name | Annual Mean Air Temperature (2 meter) |
| standard_name | air_temperature |
| units | degree_Celsius |
| grid_mapping | mapping |
| source | Janneke Ettema; Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, Netherlands |
| reference | Ettema J., M.R. van den Broeke, E. van Meigaard, W.J. van de Berg, J.L. Bamber, J.E. Box, and R.C. Bales (2009), Higher surface mass balance of the Greenland ice sheet revealed by high-resolution climate modeling, Geophys. Res. Lett., 36, L12501, doi:10.1029/2009GL038110 |
| comments | Natgridd's linear natural neighbor algorithm was used for interpolation. |
| presprcp | |
| long_name | Present Precipitation |
| standard_name | lwe_precipitation_rate |
| units | meters/year |
| grid_mapping | mapping |
| source | Janneke Ettema; Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, Netherlands |
| reference | Ettema J., M.R. van den Broeke, E. van Meigaard, W.J. van de Berg, J.L. Bamber, J.E. Box, and R.C. Bales (2009), Higher surface mass balance of the Greenland ice sheet revealed by high-resolution climate modeling, Geophys. Res. Lett., 36, L12501, doi:10.1029/2009GL038110 |
| comments | Natgridd's linear natural neighbor algorithm was used for interpolation. |
| bheatflx | |
| long_name | Basal Heat Flux |
| standard_name | upward_geothermal_flux_at_ice_base |
| units | watts/meter^2 |
| grid_mapping | mapping |
| source | http://ciei.colorado.edu/~nshapiro/MODEL/ASC_VERSION/index.html |
| reference | Shapiro, N.M. and Ritzwoller, M.H. (2004), Inferring Surface Heat Flux Distributions Guided by a Global Seismic Model: Particular Application to Antarctica; Earth and Planetary Science letters, 223: 213-224. |
| comments | Natgridd's linear natural neighbor algorithm was used for interpolation. |
* A description of recent changes to this and other data sets can be found in the change log.
