These csv files contain a row of floating point values derived for each RGI v6.0 glacier polygon.
Please see script used to generate for more detail: https://github.com/dshean/hma_mb_paper/blob/master/scripts/mb_parallel.py
Variable names written to csv: https://github.com/dshean/hma_mb_paper/blob/master/scripts/mb_parallel.py#L1247
The first line of the csv contains a header:
RGIId,x,y,z_med,z_min,z_max,z_slope,z_aspect,dhdt_ma,dhdt_ma_sigma,mb_mwea,mb_mwea_sigma,area_m2,mb_m3wea,mb_m3wea_sigma,t1,t2,dt,valid_area_perc,H_m,debris_m,perc_debris,perc_pond,perc_clean,vm_ma
Sample row (Ngozumpa Glacier, Nepal):
15.03474,159420.734,-893584.333,5492.891,4903.261,7219.088,13.396,181.068,-0.552,0.232,-0.469,0.201,12919247.330,-6064497.893,2653695.223,2000.412,2018.412,18.000,99.968,94.255,0.281,42.958,0.719,56.323,6.321
| Parameter | Description | Units | Example |
|---|---|---|---|
| RGIId | RGI glacier polygon ID | 15.03474 | |
| x | glacier polygon centroid x-coordinate in custom Albers-Equal-Area coordinate system. See text for details, PROJ4 string '+proj=aea +lat_1=25 +lat_2=47 +lat_0=36 +lon_0=85 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs') |
meters | 159420.734 |
| y | glacier polygon centroid y-coordinate in custom Albers-Equal-Area coordinate system. See text for details, PROJ4 string '+proj=aea +lat_1=25 +lat_2=47 +lat_0=36 +lon_0=85 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs') |
meters | -893584.333 |
| z_med | median glacier elevation from ASTER/WV DEM composite | meters above WGS84 ellipsoid | 5492.891 |
| z_min | minimum glacier elevation from ASTER/WV DEM composite | meters above WGS84 ellipsoid | 4903.261 |
| z_max | maximum glacier elevation from ASTER/WV DEM composite | meters above WGS84 ellipsoid | 7219.088 |
| z_slope | median glacier slope from ASTER/WV DEM composite | degrees | 13.396 |
| z_aspect | median glacier aspect from ASTER/WV DEM composite | degrees (clockwise from North) | 181.068 |
| dhdt_ma | mean glacier elevation change (see text for details) | meters per year | -0.552 |
| dhdt_ma_sigma | glacier elevation change uncertainty (see text for details) | meters per year | 0.232 |
| mb_mwea | mean specific glacier mass balance (see text for details) | meters water equivalent per year | -0.469 |
| mb_mwea_sigma | specific glacier mass balance uncertainty (see text for details) | meters water equivalent per year | 0.201 |
| area_m2 | glacier polygon valid dh/dt area | m^2 | 12919247.330 |
| mb_m3wea | total glacier mass balance (see text for details) | cubic meters water equivalent per year | -6064497.893 |
| mb_m3wea_sigma | total glacier mass balance uncertainty (see text for details) | cubic meters water equivalent per year | 2653695.223 |
| t1 | Begin date | decimal year | 2000.412 |
| t2 | End date | decimal year | 2018.412 |
| dt | Time difference | decimal year | 18.000 |
| valid_area_perc | glacier polygon valid dh/dt area as percentage of total polygon area | % | 99.968 |
Included for glaciers with grids available from external sources, glaciers larger than 2 km^2
- Ice thickness: Updated to RGI v6.0 by Matthias Huss, downloaded March 2018, based on Huss and Farinotti (2012)
- Debris classification: Kraaijenbrink et al. (2017), http://mountainhydrology.org/data-nature-2017/
- Surface Velocity: Preliminary ITS_LIVE data, downloaded August 2018 (HMA_G0240_0000), https://its-live.jpl.nasa.gov/
| Parameter | Description | Units | Example |
|---|---|---|---|
| H_m | Mean ice thickness from Matthias Huss (2018) | meters | 94.255 |
| debris_m | Mean debris thickness from Kraaijenbrink et al. (2017) | meters | 0.281 |
| perc_debris | Percent of glacier polygon classified as debris, from Kraaijenbrink et al. (2017) | % | 42.958 |
| perc_pond | Percent of glacier polygon classified as pond, from Kraaijenbrink et al. (2017) | % | 0.719 |
| perc_clean | Percent of glacier polygon classified as clean ice, from Kraaijenbrink et al. (2017) | % | 56.323 |
| vm_ma | Mean glacier velocity magnitude from ITS_LIVE, Gardner et al. (2019) | meters per year | 6.321 |