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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

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

product_versionv3.2
processing_modeoperational
gridNSIDC polar stereographic projection. http://nsidc.org/data/polar_stereo/ps_grids.html
historyProduct generated with SMOS sea ice thickness retrieval Algorithm v3.2
source
SMOS v620 L1C brightness temperature

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_

lat

coverage_

min50.0geospatial_lat_max90.0geospatial_lon_min-180.0geospatial_lon_max180.0geospatial_vertical_min0.0geospatial_vertical_max0.0

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.

VariableDescriptionUnitTypeDimension
latitudelatitude coordinatedegrees_northfloat896 x 608
longitudelongitude coordinatedegrees_eastfloat896 x 608

x

Projection_x_corordinatekmfloat608
yProjection_y_corordinatekmfloat896
sea_ice_thicknessSMOS sea ice thicknessmfloat1 x 896 x 608
ice_thickness_uncertaintysea ice thickness total uncertaintym

float

1 x 896 x 608

saturation_ratio

ratio of retrieved ice thickness and maximal retrievable ice thickness

%short1 x 896 x 608
TB

brightness temperature intensity (TBh+TBv)/2

Kfloat1 x 896 x 608
TB_uncertainty

brightness temperature uncertainty defined as one standard deviation of TB devided by the sqrt(nPair)

Kfloat1 x 896 x 608
Tsurf

SMOS derived snow surface temperature

Kfloat1 x 896 x 608
Sice

Bulk ice salinity

psufloat1 x 896 x 608
nPair

number of TBh and TBv pairs available


short1 x 896 x 608
RFI_ratio

percent of RFI-contaminated measurements in total measurements

%float1 x 896 x 608
land

land_binary_mask


byte896 x 608
time

hours since 2010-01-01 00:00:00

hourdouble1



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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


















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(info) Product Description Document

(info) Read_me_first Technical Note

ESA Websites:

ESA EO Mission SMOS


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Contact

Xiangshan Tian-Kunze

Lars Kaleschke

Robert Ricker

Stefan Hendricks