Version 2.1
Distributed data processing levels for version 2.1 are the daily trajectory summary (l2p) and weekly/monthly gridded data (l3c). The content of products based on the near-real time and reprocessed input version are identical and marked by the timeliness tag in the filename and global attributes of the netCDF files.
l2p trajectory
The Level-2 pre-processed (l2p) product contains daily information from CryoSat-2 at full resolution (see documentation).
Filenaming
The filename of l2p data indicated the timelines (nrt or ntc) and the date (e.g. 20181001) of the data file:
awi-siral-l2p-sithick-cryosat2-{timeliness}-nh-{year}{month}{day}-fv2p1.nc
netCDF Global Attributes
The global attributes of the netCDF file provide metadata
netCDF Variables
| Parameter | Description | Unit | Comment |
|---|---|---|---|
freeboard | freeboard of the sea ice layer | meter | |
freeboard_uncertainty | freeboard uncertainty | meter | |
latitude | latitude of satellite nadir measurement point | degrees north | |
longitude | longitude of satellite nadir measurement point | degrees east | |
radar_freeboard | elevation of retracked point above instantaneous sea surface height | meter | radar freeboard is defined as the elevation based |
radar_freeboard_uncertainty | algorithm uncertainty (error propagation) of the radar freeeboard retrieval | meter | |
radar_mode | radar mode flag | None | flag meaning: 0: pulse limited (lrm) |
region_code | Region code (adapted from NSIDC region mask with Baltic Sea added) | None | New in version 2.1 flag meaning: 0: Inland sea and lakes |
sea_ice_density | density of the sea ice layer | kg m-3 | |
sea_ice_density_uncertainty | uncertainty of the sea ice layer density | kg m-3 | |
sea_ice_thickness | thickness of the sea ice layer | meter | |
sea_ice_thickness_uncertainty | uncertainty of the sea ice layer thickness | meter | |
sea_ice_type | fraction of multi-year ice | None | Meaning: 0: only first year ice |
sea_ice_type_uncertainty | uncertainty of sea ice classification | None | |
snow_density | density of the snow layer | kg m-3 | |
snow_density_uncertainty | uncertainty of the snow layer density | kg m-3 | |
snow_depth | thickness of the snow layer | meter | |
snow_depth_uncertainty | uncertainty of the snow layer thickness | meter | |
time | UTC timestamp | seconds since 1970-01-01 |