Text · collection · 1978
Walsh and Chapman Northern Hemisphere Sea Ice Data Set
Listed in NASA Earthdata CMR
Mid-month values of sea ice concentration for the Arctic are digitized on a standard 1-degree grid (cylindrical projection) to provide a "relatively uniform set of sea ice extent for all longitudes, as a basis for hemispheric scale studies of observed sea ice fluctuations" (Walsh, 1978).
Description
These data are a compilation of data from many sources integrated into a single gridded product by John Walsh and Bill Chapman, University of Illinois.
The sources of data for each grid cell have changed over the years from infrequent land/sea observations, to observationally derived charts, to satellite data for the most recent decades. Temporal and spatial gaps within observed data are filled with a climatology or other statistically derived data. Please note that large portions of the pre-1953, and almost all of the pre-1900 data is either climatology or interpolated data and the user is cautioned to use this data with care.
Read the rest (4 more)
The data sources for the ice concentrations vary spatially and temporally. There are eight basic data sources for the ice concentrations: 1. Danish Meteorlogical Institute 2.
Japan Meteorological Agency 3. Naval Oceanographic Office (NAVOCEANO) 4. Kelly ice extent grids (based upon Danish Ice Charts) 5.
Walsh and Johnson/Navy-NOAA Joint Ice Center 6. Navy-NOAA Joint Ice Center Climatology 7. Temporal extension of Kelly data (see note below) 8.
Nimbus-7 SMMR Arctic Sea Ice Concentrations or DMSP SSM/I Sea Ice Concentrations using the NASA Team Algorithm
Links
Documentation and papers
- cgd.ucar.edu /cas/guide/Data/walsh.html ↗
Decsription of the Walsh and Chapman sea ice concentration data set
documentation · from NASA CMR
Catalogue records · 2
- CMR record cmr.earthdata.nasa.gov/search/concepts/C1214612552-SCIOPS.html ↗
catalogue entry · from NASA CMR
- CMR UMM-JSON cmr.earthdata.nasa.gov/search/concepts/C1214612552-SCIOPS.umm_json ↗
metadata API · from NASA CMR
Topics
Provenance · 1 source records, 15 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| NASA Earthdata CMR | C1214612552-SCIOPS | 13 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[instrument].gcmd_instrument:smmr | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[instrument].gcmd_instrument:ssm-i | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/cryosphere/sea-ice/sea-ice-concentration | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/oceans/sea-ice/sea-ice-concentration | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[platform].gcmd_platform:dmsp | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[platform].gcmd_platform:nimbus-7 | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[platform].gcmd_platform:not-provided | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[platform].gcmd_platform:ships | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| description | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/Abstract |
| publication_date | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| spatial | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/SpatialExtent |
| temporal | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/TemporalExtents |
| title | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/EntryTitle |
| version_label | source · NASA CMR | connector:nasa_cmr@1.0.0 |