• Created by Unknown User (rricker), last modified on Oct 20, 2018

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Product Version

Version

Date

Description of Changes

1.0

02/12/2015

Initial version

1.1

01/06/2016

  • New background field estimate
  • New correlation length scale estimate
  • Applying OSI SAF ice type product to exclude SMOS data over multiyear ice

1.2

23/11/2016

  • Added CS2/SMOS weighted mean field in netcdf files
  • Added attributes in netcdf files
  • Switch to netcdf version 4

1.3

05/06/2017

  • This algorithm version refers to Ricker et al. (2017)
  • SMOS background now uses one week behind and one week ahead of the target week
  • Switching from SMOS product version 3.0 to 3.1 Documentation changes

1.4

01/09/2018

  • To be added …

Data Access

Daily SMOS and weekly merged CryoSat-SMOS sea ice thickness data can be downloaded via FTP through a Web browser, a FTP client (e.g. FileZilla) or command line. The access is anomymous.

Get data via AWI FTP

Info

Due to melting, the SMOS and CryoSat-2 data processing is stopped in April and resumed in October.

How to cite the Data

For the merged CryoSat-SMOS sea ice thickness data, please

  1. cite: Ricker, R.; Hendricks, S.; Kaleschke, L.; Tian-Kunze, X.; King, J. and Haas, C. (2017), A weekly Arctic sea-ice thickness data record from merged CryoSat-2 and SMOS satellite data, The Cryosphere, 11, 1607-1623, doi:10.5194/tc-11-1607-2017.

  2. include the following phrase into the acknowledgment:

    The production of the merged CryoSat-SMOS sea ice thickness data was funded by the ESA project SMOS & CryoSat-2 Sea Ice Data Product Processing and Dissemination Service, and data from DATE to DATE were obtained from AWI.

For the SMOS sea ice thickness data, please

  1. cite: Kaleschke, L., X. Tian‐Kunze, N. Maaß, M. Mäkynen, 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. include the following phrase into the acknowledgment:

    The production of the SMOS sea ice thickness data was funded by the ESA project SMOS & CryoSat-2 Sea Ice Data Product Processing and Dissemination Service, and data from DATE to DATE were obtained from AWI.



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.




Table 1: NETCDF file content.

Variable

Description

Unit

Type

Dimension

Lambert_Azimuthal_Grid

-

-

int

-

time_bnds

-

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

int

2

analysis_ice_thickness

CS2SMOS merged sea ice thickness

m

Int

1,432,432

background_ice_thickness

optimal interpolation background field

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

-

Int

1,432,432

correlation_length_scale

correlation length scale of sea 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

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



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