netcdf greenland_5km {
dimensions:
	sealeveltimes = 126 ;
	oisotopestimes = 1251 ;
	x1 = 301 ;
	y1 = 561 ;
	time = 1 ;
variables:
	float sealeveltimes(sealeveltimes) ;
		sealeveltimes:long_name = "Time (years before present)" ;
		sealeveltimes:standard_name = "time" ;
		sealeveltimes:units = "years" ;
	float dhdt(time, y1, x1) ;
		dhdt:reference = "Bea Csathol, Toni. Schenk, C.J. van der Veen, William B Krabill (2009), \"Reconstruction of Greenland Ice Sheet Changes from Laser Altimetry Measurements\"; (Abstract submitted to AGU 2009 Fall Meeting)." ;
		dhdt:grid_mapping = "mapping" ;
		dhdt:long_name = "Time Rate of Change of Ice Sheet Surface Height" ;
		dhdt:standard_name = "tendency_of_land_ice_thickness" ;
		dhdt:units = "meters/year" ;
	float surfvelmag(time, y1, x1) ;
		surfvelmag:reference = "Joughin, Smith, Howat, and Scambos, in prep" ;
		surfvelmag:grid_mapping = "mapping" ;
		surfvelmag:long_name = "Surface Velocity Magnitude" ;
		surfvelmag:units = "meters/year" ;
	float lat(time, y1, x1) ;
		lat:grid_mapping = "mapping" ;
		lat:long_name = "Latitude" ;
		lat:standard_name = "latitude" ;
		lat:units = "degreeN" ;
	float balvelmag(time, y1, x1) ;
		balvelmag:source = "Created by Jesse Johnson at the University of Montana, July 2009, from the present preciptation (presprcp) field (van der Veen, C. J., D. H. Bromwich, B. Csatho, and C. Kim, 2001) and the thickness (thk) field (Bamber, J.L., R.L. Layberry, S.P. Gogenini. 2001) using the Glimmer/CISM model." ;
		balvelmag:grid_mapping = "mapping" ;
		balvelmag:long_name = "Balance Velocity Magnitude" ;
		balvelmag:units = "meters/year" ;
	float y1(y1) ;
		y1:long_name = "Cartesian y-coordinate" ;
		y1:standard_name = "projection_y_coordinate" ;
		y1:units = "meters" ;
	float oisotopestimes(oisotopestimes) ;
		oisotopestimes:long_name = "Time (years before present)" ;
		oisotopestimes:standard_name = "time" ;
		oisotopestimes:units = "years" ;
	float bheatflx(time, y1, x1) ;
		bheatflx:reference = "http://ciei.colorado.edu/~nshapiro/MODEL/ASC_VERSION/ 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." ;
		bheatflx:grid_mapping = "mapping" ;
		bheatflx:long_name = "Basal Heat Flux" ;
		bheatflx:standard_name = "upward_geothermal_flux_at_ice_base" ;
		bheatflx:units = "watts/meter^2" ;
	float presprcp(time, y1, x1) ;
		presprcp: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" ;
		presprcp:grid_mapping = "mapping" ;
		presprcp:long_name = "Present Precipitation" ;
		presprcp:standard_name = "lwe_precipitation_rate" ;
		presprcp:units = "meters/year" ;
		presprcp:source = "Thanks to Janneke Ettema of the Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, Netherlands for providing this data.  Originally in a text file containing longitudes, latitudes, and data values, the data was interpolated onto the standard grid using natural neighbor interpolation (based on Delaunay triangulation).  This was accomplished using matplotlib.mlab.griddata within a python script." ;
	float lon(time, y1, x1) ;
		lon:grid_mapping = "mapping" ;
		lon:long_name = "Longitude" ;
		lon:standard_name = "longitude" ;
		lon:units = "degreeE" ;
	float sealevel_time_series(sealeveltimes) ;
		sealevel_time_series:reference = "Imbrie, John D.; McIntyre, A. (2006), SPECMAP time scale developed by Imbrie et al., 1984 based on normalized planktonic records (normalized O-18 vs time, specmap.017), doi:10.1594/PANGAEA.441706" ;
		sealevel_time_series:long_name = "Sea Level (variation from present)" ;
		sealevel_time_series:standard_name = "global_average_sea_level_change" ;
		sealevel_time_series:units = "meters" ;
	float usrf(time, y1, x1) ;
		usrf:reference = "[1] 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.  [2] 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." ;
		usrf:grid_mapping = "mapping" ;
		usrf:long_name = "Ice Upper Surface Elevation" ;
		usrf:standard_name = "surface_altitude" ;
		usrf:units = "meters" ;
	char mapping ;
		mapping:ellipsoid = "WGS84" ;
		mapping:false_easting = 0. ;
		mapping:false_northing = 0. ;
		mapping:grid_mapping_name = "polar_stereographic" ;
		mapping:latitude_of_projection_origin = 90. ;
		mapping:standard_parallel = 71. ;
		mapping:straight_vertical_longitude_from_pole = -39. ;
	float surfvely(time, y1, x1) ;
		surfvely:reference = "Joughin, Smith, Howat, and Scambos, in prep" ;
		surfvely:grid_mapping = "mapping" ;
		surfvely:long_name = "y-Component of Ice Surface Velocity" ;
		surfvely:standard_name = "land_ice_y_velocity" ;
		surfvely:units = "meters/year" ;
	float surfvelx(time, y1, x1) ;
		surfvelx:reference = "Joughin, Smith, Howat, and Scambos, in prep" ;
		surfvelx:grid_mapping = "mapping" ;
		surfvelx:long_name = "x-Component of Ice Surface Velocity" ;
		surfvelx:standard_name = "land_ice_x_velocity" ;
		surfvelx:units = "meters/year" ;
	float topg(time, y1, x1) ;
		topg:reference = "[1] Topography - 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.  [2] 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.  [3] Bathymetry - www.ibcao.org Jakobsson, M., Macnab, R., Mayer, L., Anderson, R., Edwards, M., Hatzky, J., Schenke, H-W., and Johnson, P. (2008), \"An Improved Bathymetric Portrayal of the Arctic Ocean: Implications for Ocean Modeling and Geological, Geophysical and Oceanographic Analyses\"; v. 35, L07602, Geophysical Research Letters, doi:10.1029/2008GL033520." ;
		topg:comment = "This data set incorporates the CReSIS \"Jakobshavn Glacier Elevation Data\" from https://www.cresis.ku.edu/research/data/greenland_data.html (downloaded on 15 January 2010).  Since the grid spacing of the CReSIS data is much smaller than the 5km grid used here, local spacial averages of the CReSIS data were calculated for each 5km grid point.  Values on the border of the region for which there is CReSIS data were assigned an average of the new values and the original values to decrease artificial gradients outside.  To accommodate the new bed elevation values some values of the usrf and thk variables were also modified." ;
		topg:grid_mapping = "mapping" ;
		topg:long_name = "Bedrock Topography" ;
		topg:standard_name = "bedrock_altitude" ;
		topg:units = "meters" ;
	int landcover(time, y1, x1) ;
		landcover:reference = "Bea Csathol, Toni. Schenk, C.J. van der Veen, William B Krabill (2009), \"Reconstruction of Greenland Ice Sheet Changes from Laser Altimetry Measurements\"; (Abstract submitted to AGU 2009 Fall Meeting)." ;
		landcover:grid_mapping = "mapping" ;
		landcover:ice_sheet = 4 ;
		landcover:land = 2 ;
		landcover:local_ice_caps_not_connected_to_the_ice_sheet = 3 ;
		landcover:long_name = "Land Cover" ;
		landcover:no_data = 0 ;
		landcover:ocean = 1 ;
		landcover:standard_name = "land_cover" ;
	float x1(x1) ;
		x1:long_name = "Cartesian x-coordinate" ;
		x1:standard_name = "projection_x_coordinate" ;
		x1:units = "meters" ;
	float temp_time_series(oisotopestimes) ;
		temp_time_series:reference = "[1] Johnsen, S.J., H.B. Clausen, W. Dansgaard, N.S. Gundestrup, C.U. Hammer, U. Andersen, K.K. Andersen, C.S. Hvidberg, D. Dahl-Jensen, J.P. Steffensen, H. Shoji, A.E. Sveinbj-rnsdUttir, J.W.C. White, J. Jouzel, and D. Fisher (1997), \"The d18O Record Along the Greenland Ice Core Project Deep Ice Core and the Problem of Possible Eemian Climatic Instability\"; Journal of Geophysical Research 102:26397-26410.  [2] Dansgaard, W., S.J. Johnsen, H.B. Clausen, D. Dahl-Jensen, N.S. Gundestrup, C.U. Hammer, C.S. Hvidberg, J.P. Steffensen, A.E. Sveinbj-rnsdUttir, J. Jouzel, and G.C. Bond (1993), \"Evidence for General Instability of Past Climate from a 250 kyr Ice-core Record\"; Nature 264:218-220.  [3] GRIP Members (1993), \"Climate Instability During the Last Interglacial Period Recorded in the GRIP Ice Core\"; Nature 364:203-207.  [4] Grootes, P.M., M. Stuiver, J.W.C. White, S.J. Johnsen, and J. Jouzel (1993), \"Comparison of Oxygen Isotope Records from the GISP2 and GRIP Greenland Ice Cores\"; Nature 366:552-554.  [5] Dansgaard, W., J.W.C. White, and S.J. Johnsen (1989), \"The Abrupt Termination of the Younger Dryas Climate Event\"; Nature 339:532-533." ;
		temp_time_series:computed_by_formula = "2.4(oisotope_time_series+34.83) (except for t=0 at which the temperature variation is zero by definition)" ;
		temp_time_series:long_name = "Temperature (variation from present)" ;
		temp_time_series:standard_name = "land_ice_temperature_at_firn_base" ;
		temp_time_series:units = "degree_Celsius" ;
	float thk(time, y1, x1) ;
		thk:reference = "[1] 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.  [2] 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." ;
		thk:grid_mapping = "mapping" ;
		thk:long_name = "Ice Thickness" ;
		thk:standard_name = "land_ice_thickness" ;
		thk:units = "meters" ;
	float time(time) ;
		time:calender = "none" ;
		time:long_name = "Time" ;
		time:standard_name = "time" ;
		time:units = "year since 1-1-1 0:0:0" ;
	float oisotopes_time_series(oisotopestimes) ;
		oisotopes_time_series:reference = "[1] Johnsen, S.J., H.B. Clausen, W. Dansgaard, N.S. Gundestrup, C.U. Hammer, U. Andersen, K.K. Andersen, C.S. Hvidberg, D. Dahl-Jensen, J.P. Steffensen, H. Shoji, A.E. Sveinbj-rnsdUttir, J.W.C. White, J. Jouzel, and D. Fisher (1997), \"The d18O Record Along the Greenland Ice Core Project Deep Ice Core and the Problem of Possible Eemian Climatic Instability\"; Journal of Geophysical Research 102:26397-26410.  [2] Dansgaard, W., S.J. Johnsen, H.B. Clausen, D. Dahl-Jensen, N.S. Gundestrup, C.U. Hammer, C.S. Hvidberg, J.P. Steffensen, A.E. Sveinbj-rnsdUttir, J. Jouzel, and G.C. Bond (1993), \"Evidence for General Instability of Past Climate from a 250 kyr Ice-core Record\"; Nature 264:218-220.  [3] GRIP Members (1993), \"Climate Instability During the Last Interglacial Period Recorded in the GRIP Ice Core\"; Nature 364:203-207.  [4] Grootes, P.M., M. Stuiver, J.W.C. White, S.J. Johnsen, and J. Jouzel (1993), \"Comparison of Oxygen Isotope Records from the GISP2 and GRIP Greenland Ice Cores\"; Nature 366:552-554.  [5] Dansgaard, W., J.W.C. White, and S.J. Johnsen (1989), \"The Abrupt Termination of the Younger Dryas Climate Event\"; Nature 339:532-533." ;
		oisotopes_time_series:long_name = "Oxygen Isotope Record (parts per thousand)" ;
		oisotopes_time_series:units = "1e-3" ;
	float runoff(time, y1, x1) ;
		runoff:units = "meters/year" ;
		runoff:long_name = "Runoff" ;
		runoff:standard_name = "surface_runoff_flux" ;
		runoff: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" ;
		runoff:source = "Thanks to Janneke Ettema of the Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, Netherlands for providing this data.  Originally in a text file containing longitudes, latitudes, and data values, the data was interpolated onto the standard grid using natural neighbor interpolation (based on Delaunay triangulation).  This was accomplished using matplotlib.mlab.griddata within a python script." ;
		runoff:grid_mapping = "mapping" ;
	float smb(time, y1, x1) ;
		smb:units = "meters/year" ;
		smb:long_name = "Surface Mass Balance" ;
		smb:standard_name = "land_ice_lwe_surface_specific_mass_balance" ;
		smb: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" ;
		smb:source = "Thanks to Janneke Ettema of the Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, Netherlands for providing this data.  Originally in a text file containing longitudes, latitudes, and data values, the data was interpolated onto the standard grid using natural neighbor interpolation (based on Delaunay triangulation).  This was accomplished using matplotlib.mlab.griddata within a python script." ;
		smb:grid_mapping = "mapping" ;
	float airtemp2m(time, y1, x1) ;
		airtemp2m:long_name = "Annual Mean Air Temperature (2 meter)" ;
		airtemp2m:standard_name = "air_temperature" ;
		airtemp2m:note = "Janneke Ettema (personal correspondence) provides the following comment: \"I would recommend to use the surface temperature as boundary condition for ice dynamic model instead of the 2 meter temperature. They might differ significantly, especially for Greenland where Ts is limited to 0C and T2m could rise over the melting point. Furthermore, T2m is a result of interpolating the temperature at the lowest atmospheric model layer and the surface temperature using a certain lapse rate. The surface temperature is a direct result from the energy balance computed at the ice sheet surface.\"" ;
		airtemp2m: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" ;
		airtemp2m:source = "Thanks to Janneke Ettema of the Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, Netherlands for providing this data.  Originally in a text file containing longitudes, latitudes, and data values, the data was interpolated onto the standard grid using natural neighbor interpolation (based on Delaunay triangulation).  This was accomplished using matplotlib.mlab.griddata within a python script." ;
		airtemp2m:grid_mapping = "mapping" ;
	float surftemp(time, y1, x1) ;
		surftemp:units = "degree_Celsius" ;
		surftemp:long_name = "Annual Mean Surface Temperature" ;
		surftemp:standard_name = "surface_temperature" ;
		surftemp: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" ;
		surftemp:source = "Thanks to Janneke Ettema of the Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, Netherlands for providing this data.  Originally in a text file containing longitudes, latitudes, and data values, the data was interpolated onto the standard grid using natural neighbor interpolation (based on Delaunay triangulation).  This was accomplished using matplotlib.mlab.griddata within a python script." ;
		surftemp:grid_mapping = "mapping" ;

// global attributes:
		:Comments = "Revised on 02 February 2010 by Glen Granzow at the University of Montana to include climate data from J. Ettema et al. (2009)" ;
		:Conventions = "CF-1.3" ;
		:Creators = "Jesse Johnson, Brian Hand, Tim Bocek - University of Montana" ;
		:History = "Original data set created February 2009" ;
		:Title = "Greenland Developmental Data Set" ;
}