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Version

Date

Comments

v2.0

15.10.2018

Official ESA release


NetCDF file naming

NetCDF files of near-real time processed data are named:

awi-cs2smos-l4-sithick-cryosat2_smos_merged-nrt-nh_25km_ease2-yyyymmdd_ yyyymmdd-fv2p0.nc

NetCDF files of reprocessed data are named:

awi-cs2smos-l4-sithick-cryosat2_smos_merged-rep-nh_25km_ease2-yyyymmdd_ yyyymmdd-fv2p0.nc

Description of NetCDF data files

The weekly analysis grids are given in standardized binary data format (Network common data form: NetCDF v4). The variables are given as grid arrays, see therefore Table 1. All grids are projected onto the 25 km EASE2 Grid, which is based on a polar aspect spherical Lambert azimuthal equal-area projection  (Figure 1). NetCDF files are formatted according to CF conventions: CF-1.6 ACDD-1.3.

Figure 1: Specifications of the EASE2 25 km grid, which is used for the merged product.


VariableDescriptionUnitTypeDimension
Lambert_Azimuthal_Grid

-

-

int-

time_bnds

-

seconds since 1978-01-01 00:00:00

int2

analysis_ice_thickness

CS2SMOS merged sea ice thickness

m

Int1,432,432

background_ice_thickness

optimal interpolation background field

m

Int1,432,432

weighted_mean_ice_thickness

weighted mean of weekly cs2 and smos ice thickness retrievals

m

Int1,432,432

innovation

difference between background and analysis ice thickness

m

Int1,432,432

ice_conc

sea ice concentration

%

Int1,432,432

ice_type

sea ice type

-

Int1,432,432

correlation_length_scale

correlation length scale of sea ice thickness

m

Int1,432,432

analysis_thickness_unc

uncertainty of the merged sea ice thickness

m

Int1,432,432

smos_ice_thickness

weekly averaged SMOS ice thickness

m

Int1,432,432

cs2_ice_thickness

weekly averaged CryoSat-2 ice thickness

m

Int1,432,432

time

reference time of product

seconds since 1978-01-01 00:00:00

Int1

xc

x coordinate of projection (eastings)

km

Int432

yc

y coordinate of projection (northings)

km

Int432

lon

longitude coordinate

degrees_north

Int432,432

lat

latitude coordinate

degrees_east

int432,432
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