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Version

Date

Comments

v2v3.02

15.10.2018

Official ESA release

Contact

Robert Ricker

Stefan Hendricks

Xiangshan Tian-Kunze

Lars Kaleschke

Example NetCDF naming for near-real time processed data:

awi-cs2smos-l4-sithick-cryosat2_smos_merged-nrt-nh25km_ease2-20180326_20180401-fv2p0.nc

Example NetCDF naming for reprocessed data:

awi-cs2smos-l4-sithick-cryosat2_smos_merged-rep-nh25km_ease2-20180326_20180401-fv2p0

as:

SMOS_Icethickness_v3.2_north_<date>.nc

File Format

The weekly grids are given in standardized binary data format (Network common data form: NetCDF v4)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. NetCDF files are formatted according to CF conventions: CF-1.6 ACDD-1. 3. We use a scaling factor of 10^-3 and a fillvalue = -2147483647.

Table 2: Global attributes from an example NetCDF file, covering the week from March 26 to April 01, 2018.

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(info)

Product Description

Document

(info) Read-me-first technical note

ESA Websites:

ESA EO Mission CryoSat

ESA EO Mission SMOS

Visualization of NetCDF data:

Panoply

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Overview

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Product Description

Overview

Table 1: Overview of SMOS Product


Parameter

Sea ice thickness

Spatial covergae

N: 90°, S:

16.6°

50°, E:180°, W:-180°

Spatial Resolution

25 km x 25

12.5 km x12.5 km

Temporal Coverage:

November 2010 to present

since 15. Oct. 2018

Temporal Resolution

7 days

1 day

Data Format(s)

NetCDF

Platforms

CryoSat-2,

SMOS

Version

v2

v3.

0

2

File naming convention

NetCDF files are named using the following convention:

<institution>-<product>-<processing level>-<parameter>-<platform(s)>-<mode>-<grid>-<time>-<version>.nc

institution

Alfred Wegener Institute (AWI): awi

product

CryoSat-2/SMOS merged product: cs2smos

processing level

Level 4: l4

parameter

Sea ice thickness: sithick

Platform(s)

Satellites: SMOS, CryoSat-2

mode

Reprocessing: rep, near-real-time: nrt

grid

25 km EASE2 grid, Northern Hemisphere: nh25km_ease2

time

Time span: yyyymmdd - yyyymmdd

version

Version 2.0: fv2p0

Attribute

Value

title

Sea Ice Thickness derived from merging CryoSat-2 and SMOS ice thickness


description
Weekly Arctic sea-ice thickness derived from CryoSat-2 and SMOS using an optimal interpolation scheme

summary
Weekly Arctic sea-ice thickness derived from CryoSat-2 and SMOS using an optimal interpolation scheme

keywords
Cryosphere > Sea Ice > Sea Ice Thickness

product_version
fv2p0

processing_mode
rep

time_of_creation
Mon Oct 22 17:27:55 2018

history
Mon Oct 22 17:27:55 2018 creation

Conventions
CF-1.6 ACDD-1.3

spatial_resolution
25.0 km grid spacing

geospatial_lat_min
16.623929977416992

geospatial_lat_max
90.0

geospatial_lon_min
-180.0
geospatial_lon_max
180.0
geospatial_vertical_min
0.0
geospatial_vertical_max
0.0
time_coverage_start
2018-0310-26T0028T00:00:00Z
time_coverage_end
2018-0410-01T0028T23:0059:00Z
time_coverage_duration
P7DP1D
time_coverage_resolution
P7DP1D
platform
CryoSat-2, 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
robertxiangshan.ricker@awitiankunze@awi.de
references
Ricker, R., Hendricks, S., Kaleschke, L., Tian-Kunze, X., King, J., and Haas, C.: A weekly Arctic sea-ice thickness data record from merged CryoSat-2 and SMOS satellite data, The Cryosphere, 11, 1607-1623, https://doi.org/10.5194/tc-11-1607-2017, 2017.

_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
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Grid
All grids are projected onto the 25 km EASE2 Grid, which is based on a polar aspect spherical Lambert azimuthal equal-area projection (Brodzik et al., 2012). The grid dimension is 5400 km x 5400 km, equal to a 432 x 432 grid. The grid is centered on the geographic Pole, meaning that the Pole is located at the intersection of center cells (Figure 1).
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(info) Product Description Document
(info) Read-me-first technical note
ESA Websites:
ESA EO Mission CryoSat
ESA EO Mission SMOS
Visualization of NetCDF data:

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Contact
Xiangshan Tian-Kunze
Lars Kaleschke
Robert Ricker
Stefan HendricksFigure1: Specifications of the EASE2 25 km grid, which is used for the merged product.