Product DescriptionOverviewParameter | Sea ice thickness | Spatial covergae | N: 90°, S:16.6°, E:180°, W:-180° | Spatial Resolution | 25 km x 25 km | Temporal Coverage: | November 2010 to present | Temporal Resolution | 7 days | Data Format(s) | NetCDF | Platforms | CryoSat-2, SMOS | Version | v2.0 |
File naming conventionNetCDF 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 |
Example NetCDF naming for near-real time processed data: awi-cs2smos-l4-sithick-cryosat2_smos_merged-repnrt-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.nc The weekly grids are given in standardized binary data format (Network common data form: NetCDF v4). 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. Attribute | Value |
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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 | 2018-03-26T00:00:00Z | time_coverage_end | 2018-04-01T00:00:00Z | time_coverage_duration | P7D | time_coverage_resolution | P7D | 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 | robert.ricker@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 |
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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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