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Info
titleMain improvements and changes in v3.3

 

  • Transition of L1C data from v620 to v724: In v3.3, v724 L1C data is used instead of v620 L1C.
  • Polar stereographic projection update: Following NSIDC we consider the EPSG 3411 and 3412 as deprecated and replaced this with 3413 and 3976 in v3.3 (https://nsidc.org/data/polar-stereo/ps_grids.html).
  • NetCDF format update: Furthermore, the output of L3 data in updated to NetCDF v4.



Version

Date

Comments

v3.2

15.10.2018

Official ESA release

v3.303.11.2021Official ESA release



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Product Description

Overview

Table 1: Overview of SMOS Product

Parameter

Sea ice thickness

Spatial covergae

N: 90°, S:50°, E:180°, W:-180°Northern hemisphere, poleward of 50°N, -180°E to 180°E

Spatial Resolution

12.5 km x12.5 km

Temporal Coverage:

since 15. Oct. 2018 2010

Temporal Resolution

1 day

Data Format(s)

NetCDF v4

Platforms

SMOS

Version

v3.23

File

naming convention

name

NetCDF files are named as:

SMOS_Icethickness_v3.23_north_<date>.nc

File Format

Daily mean SMOS sea ice thickness is given in NetCDF v3 v4 format. Global attributes are given in Table 2. The variables are given as grid arrays , see, therefore as listed in Table 3.

Table 2: Global attributes from an example NetCDF file.

Attribute

Value

title

description

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

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, 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 v724 L1C brightness temperature

product_version

v3.3

Processing level

L3c

grid

NSIDC polar stereographic projection. https://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 v3.3

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-fv3p3

doi

none

Date_created

e.g. “Tue Mar 24 17:37:59 2020”

spatial_resolution

12.5 km grid spacing

time_coverage_duration

P1D

time_coverage_start

yyyy-mm-ddT00:00:00

time_coverage_end

yyyy-mm-ddT23:59:59

time_coverage_resolution

P1D

geospatial_bounds_crs

EPSG:3413

summary
keywords
product_version
processing_mode
time_of_creation
history
Conventions
spatial_resolution
geospatial_lat_min

geospatial_lat_max

90.0

geospatial_

lon

lat_min

-180

50.0

geospatial_lon_max

180.0

geospatial_

vertical

lon_min

0

-180.0

geospatial_vertical_max

0.0

time

geospatial_

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.

Variable

Description

Unit

Type

Dimension

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.



Table 3: NetCDF file content.

VariableDescriptionUnitTypeDimension
latitudelatitude coordinatedegrees_northfloat32896 x 608
longitudelongitude coordinatedegrees_eastfloat32896 x 608

x

Projection_x_corordinatekmfloat32608
yProjection_y_corordinatekmfloat32896
sea_ice_thicknessSMOS sea ice thicknessmfloat321 x 896 x 608
ice_thickness_uncertaintysea ice thickness total uncertaintym

float32

1 x 896 x 608

saturation_ratio

ratio of retrieved ice thickness and maximal retrievable ice thickness

%int161 x 896 x 608
TB

brightness temperature intensity (TBh+TBv)/2

Kfloat321 x 896 x 608
TB_uncertainty

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

Kfloat321 x 896 x 608
Tsurf

SMOS derived snow surface temperature

Kfloat321 x 896 x 608
Sice

Bulk ice salinity

psufloat321 x 896 x 608
nPair

number of TBh and TBv pairs available


int161 x 896 x 608
RFI_ratio

percent of RFI-contaminated measurements in total measurements

%float321 x 896 x 608
land

land_binary_mask


int8896 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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Grid

















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(info) Product Description Document

(info) Read-_me-_first technical Technical note

ESA Websites:

ESA EO Mission CryoSatESA EO Mission SMOSVisualization of NetCDF data:


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Contact

Xiangshan Tian-Kunze

Lars Kaleschke

Robert Ricker

Stefan Hendrickscs2smos-support