README for data from the paper "Greenland Ice Sheet Elevation Change:
  Direct Observation of Process and Attribution at Summit"

Contact:
Bob Hawley, Dartmouth.
robert.l.hawley@dartmouth.edu

There are 4 datasets in this directory, Steps to process/produce each
dataset are outlined in the supplementary material of the above-named
paper.

1) Surface elevation time series from GPS transect
CSV file; columns:
1 Julian date
2 Latitude
3 Longitude
4 Elevation
5 Estimated error

2) Strain network stake locations from 2014 and 2017
Text files for each stake occupation in each year, columns described
in each text file.  

3) Accumulation measurements from 121 stakes along GPS transect
NetCDF file, varaibles used in our analysis are 'average_accum',
'average_error' and 'time' 

4) Community Firn Model results- total compaction time series.  
CFM_CTL_KM_330m.csv contains the cumulative firn-compaction time
series from four CFM runs using the Kuipers Munneke and others (2015)
firn-densification equations. The four runs were the same except for
the prescribed surface density, which is listed in the first row (in
kg/m3). The first column is the time. Columns 2 through 5 are the
cumulative firn compaction. Differencing the time series yields the
compaction predicted for each month. The compaction is calculated by
differencing the modeled firn-column thickness before and after
densification in the model.