Version	Date	Comments
v3.2	15.10.2018	Official ESA release

Product Description

Overview

Table 1: Overview of SMOS Product

Parameter	Sea ice thickness
Spatial covergae	N: 90°, S:50°, E:180°, W:-180°
Spatial Resolution	12.5 km x12.5 km
Temporal Coverage:	since 15. Oct. 2018
Temporal Resolution	1 day
Data Format(s)	NetCDF
Platforms	SMOS
Version	v3.2

File naming convention

NetCDF files are named as:

SMOS_Icethickness_v3.2_north_<date>.nc

File Format

Daily mean SMOS sea ice thickness is given in NetCDF v3 format. Global attributes are given in Table 2. The variables are given as grid arrays, see, therefore Table 3.

Table 2: Global attributes from an example NetCDF file.

Attribute	Value
title
description
summary
keywords
product_version
processing_mode
time_of_creation
history
Conventions
spatial_resolution
geospatial_lat_min
geospatial_lat_max
geospatial_lon_min	-180.0
geospatial_lon_max	180.0
geospatial_vertical_min	0.0
geospatial_vertical_max	0.0
time_coverage_start	2018-10-28T00:00:00Z
time_coverage_end	2018-10-28T23:59:00Z
time_coverage_duration	P1D
time_coverage_resolution	P1D
platform	SMOS
project	CS2SMOS PDS: SMOS & CryoSat-2 Sea Ice Data Product Processing and Dissemination Service
institution	Alfred-Wegener-Institut Helmholtz Zentrum für Polar und Meeresforschung (AWI), http://www.awi.de
creator_name	Alfred-Wegener-Institut Helmholtz Zentrum für Polar und Meeresforschung (AWI), http://www.awi.de
creator_type	institution
creator_url	https://spaces.awi.de/confluence/x/DwVmEQ
publisher_email	xiangshan.tiankunze@awi.de
references
_CoordSysBuilder	ucar.nc2.dataset.conv.CF1Convention

Table 3: NetCDF file content. Note, that we use a scaling factor of 10^-3 and a fillvalue = -2147483647.

Variable	Description	Unit	Type	Dimension
Lambert_Azimuthal_Grid	Add description	-	int	-
time_bnds	Start and end time of the weekly retrieval	seconds since 1978-01-01 00:00:00	int	2
analysis_ice_thickness	CS2SMOS weekly merged sea ice thickness	m	Int	1,432,432
background_ice_thickness	background field, interpolation using CS2 and SMOS sea ice thickness data	m	Int	1,432,432
weighted_mean_ice_thickness	weighted mean of weekly CS2 and SMOS ice thickness retrievals	m	Int	1,432,432
innovation	difference between background and analysis ice thickness	m	Int	1,432,432
ice_conc	sea ice concentration	%	Int	1,432,432
ice_type	sea ice type (OSI-403-c)	-	Int	1,432,432
correlation_length_scale	correlation length scale of background ice thickness	m	Int	1,432,432
analysis_thickness_unc	uncertainty of the merged sea ice thickness	m	Int	1,432,432
smos_ice_thickness	weekly averaged SMOS ice thickness	m	Int	1,432,432
cs2_ice_thickness	weekly averaged CryoSat-2 ice thickness	m	Int	1,432,432
time	reference time of product (middle of the week)	seconds since 1978-01-01 00:00:00	Int	1
xc	x coordinate of projection (eastings)	km	Int	432
yc	y coordinate of projection (northings)	km	Int	432
lon	longitude coordinate	degrees_north	Int	432,432
lat	latitude coordinate	degrees_east	int	432,432