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Version	Date	Comments
v3.2	15.10.2018	Official ESA release

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Product Description

Overview

Table 1: Overview of SMOS Product

Parameter	Sea ice thickness
Spatial covergae	Northern hemisphere, poleward of 50°N, -180°E to 180°E
Spatial Resolution	12.5 km x12.5 km
Temporal Coverage:	since 15. Oct. 2010
Temporal Resolution	1 day
Data Format(s)	NetCDF v3
Platforms	SMOS
Version	v3.2

File name

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 as listed in Table 3.

Table 2: Global attributes from an example NetCDF file.

Attribute	Value
title	Daily gridded sea-ice thickness and auxiliary parameters from satellite L-band radiometry data

description

product_version

v3.2

processing_mode

operational

grid

NSIDC polar stereographic projection. http://nsidc.org/data/polar_stereo/ps_grids.html

history

Product generated with SMOS sea ice thickness retrieval Algorithm v3.2

source

SMOS v620 L1C brightness temperature

project	CS2SMOS PDS CR-1: SMOS Sea Ice Data Product Processing and Dissemination Tasks, supported by ESA
institution	Alfred-Wegener-Institut Helmholtz Zentrum für Polar und Meeresforschung (AWI), http://www.awi.de
contributor_name	Xiangshan Tian-Kunze, Lars Kaleschke, Robert Ricker, Stefan Hendricks
publisher_email	xiangshan.tiankunze@awi.de
platform	“ESA Soil Moisture and Ocean Salinity (SMOS) mission”
sensor	“Microwave Imaging Radiometer using Aperture Synthesis (MIRAS)”
source	SMOS v620 L1C brightness temperature
product_version	v3.2
Processing level	L3c
grid	NSIDC polar stereographic projection. http://nsidc.org/data/polar_stereo/ps_grids.html
tracking id	08533af0-7656-4f35-b0a8-7ae4081a2c9a
naming authority	de.awi
history	Product generated with SMOS sea ice thickness retrieval Algorithm v3.2
summary	This dataset contains Level-3 daily sea ice thickness products from satellite observations in the northern hemisphere. Northern hemisphere sea ice thickness coverage is limited to the winter month between October and April. 100% sea ice coverage is assumed, which leads to underestimation of sea ice thickness.
topiccategory	Oceans Climatology Meteorology Atmosphere
keywords	Earth Science > Cryosphere > Sea Ice > Ice Depth/Thickness, Earth Science > Oceans > Sea Ice > Ice Depth/Thickness, Earth Science > Climate Indicators > Cryospheric Indicators > Ice Depth/Thickness, Geographic Region > Northern Hemisphere, Vertical Location > Sea Surface, Institutions > AWI > Alfred Wegener Institute for Polar and Marine Research


id	awi-cs2smos-l3c-sithick-smos-nh_12p5_km_polstereo-YYMMDD-fv3p2
doi	none
Date_created	e.g. “Tue Mar 24 17:37:59 2020”

spatial_resolution

12.5 km grid spacing

geospatial

time_

lat50.0geospatial_lat_max90.0geospatial_lon_min-180.0geospatial_lon_max180.0geospatial_vertical_min0.0geospatial_vertical_max0.0

coverage_

min

duration

P1D

time_coverage_start

yyyy-mm-ddT00:00:

00Z

00
time_coverage_end	yyyy-mm-ddT23:59:

59Z

59

time_coverage_

duration

resolution

P1D

time

geospatial_

coverage

bounds_

resolution

crs

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

EPSG:3411
geospatial_lat_max	90.0
geospatial_lat_min	50.0
geospatial_lon_max	180.0
geospatial_lon_min	-180.0
geospatial_vertical_max	0.0
geospatial_vertical_min	0.0
references	1) Kaleschke, L., X. Tian-Kunze, N. Maass, M. Maekynen, and M. Drusch (2012), Sea ice thickness retrieval from SMOS brightness temperatures during the Arctic freeze-up period, Geophys. Res. Lett., 39, L05501, doi:10.1029/2012GL050916. (2) Tian-Kunze, X., Kaleschke, L., Maass, N., Maekynen, M., Serra, N., Drusch, M., and Krumpen, T., SMOS-derived sea ice thickness: algorithm baseline, product specifications and initial verification, The Cryosphere, 8, 997-1018, doi:10.5194/tc-8-997-2014, 2014 (3) Kaleschke, L., Tian-Kunze, X., Maass, N., Beitsch, A., Wernecke, A., Miernecki, M. and others, SMOS sea ice product: operational application and validation in the Barents Sea marginal ice zone, Remote Sensing of Environment 180 (2016), 264-273. doi: 10.1016/j.rse.2016.03.009 (4) Tietsche, S., Alonso-Balmaseda, M., Rosnay, P., Zuo, H., Tian-Kunze, X., and Kaleschke, L.: Thin Arctic sea ice in L-band observations and an ocean reanalysis, The Cryosphere, 12, 2051-2072, https://doi.org/10.5194/tc-12-2051-2018, 2018.

geospatial_bounds_crs

EPSG:3411

Table 3: NetCDF file content.

Variable	Description	Unit	Type	Dimension
latitude	latitude coordinate	degrees_north	float	896 x 608
longitude	longitude coordinate	degrees_east	float	896 x 608
x	Projection_x_corordinate	km	float	608
y	Projection_y_corordinate	km	float	896
sea_ice_thickness	SMOS sea ice thickness	m	float	1 x 896 x 608
ice_thickness_uncertainty	sea ice thickness total uncertainty	m	float	1 x 896 x 608
saturation_ratio	ratio of retrieved ice thickness and maximal retrievable ice thickness	%	short	1 x 896 x 608
TB	brightness temperature intensity (TBh+TBv)/2	K	float	1 x 896 x 608
TB_uncertainty	brightness temperature uncertainty defined as one standard deviation of TB devided by the sqrt(nPair)	K	float	1 x 896 x 608
Tsurf	SMOS derived snow surface temperature	K	float	1 x 896 x 608
Sice	Bulk ice salinity	psu	float	1 x 896 x 608
nPair	number of TBh and TBv pairs available		short	1 x 896 x 608
RFI_ratio	percent of RFI-contaminated measurements in total measurements	%	float	1 x 896 x 608
land	land_binary_mask		byte	896 x 608
time	hours since 2010-01-01 00:00:00	hour	double	1

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Grid

Table 4: Northern Hemisphere Grid Coordinates of NSIDC Polar Stereographic Grids

(ref.: https://nsidc.org/data/polar-stereo/ps_grids.html)

X (km)	Y (km)	Latitude (deg)	Longitude (deg)	position
-3850	5850	30.98	168.35	corner
0	5850	39.43	135.00	midpoint
3750	5850	31.37	102.34	corner
3750	0	56.35	45.00	midpoint
3750	-5350	34.35	350.03	corner
0	-5350	43.28	315.00	midpoint
-3850	-5350	33.92	279.26	corner
-3850	0	55.50	225.00	midpoint