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Dataset

 

ESA Sea Ice Climate Change Initiative (Sea_Ice_cci): Nimbus-5 ESMR Sea Ice Concentration, version 1.0

Update Frequency: Not Planned
Latest Data Update: 2023-01-04
Status: Completed
Online Status: ONLINE
Publication State: Citable
Publication Date: 2023-01-17
DOI Publication Date: 2023-02-03
Download Stats: last 12 months
Dataset Size: 2.05K Files | 9GB
Abstract

This dataset provides Sea Ice Concentration (SIC) for the polar regions, derived from the Nimbus-5 Electrical Scanning Microwave Radiometer (ESMR), which operated between 1972 and 1977. It is processed with an algorithm using the single channel ESMR data (19.35 GHz), and has been gridded at 25 km grid spacing. This is the first version of the product, v1.0.

This product was generated in the context of the ESA Climate Change Initiative Programme (ESA CCI) by the Sea Ice CCI (Sea_Ice_cci) project.

Citable as:  Tonboe, R.T.; Kolbe, W.M.; Toudal Pedersen, L.; Lavergne, T.; Sørensen, A.; Saldo, R. (2023): ESA Sea Ice Climate Change Initiative (Sea_Ice_cci): Nimbus-5 ESMR Sea Ice Concentration, version 1.0. NERC EDS Centre for Environmental Data Analysis, 03 February 2023. doi:10.5285/34a15b96f1134d9e95b9e486d74e49cf. https://dx.doi.org/10.5285/34a15b96f1134d9e95b9e486d74e49cf
Abbreviation: Not defined
Keywords: Sea Ice, ESA, CCI, Arctic, Antarctic

Details

Previous Info:
No news update for this record
Previously used record identifiers:
No related previous identifiers.
Access rules:
Public data: access to these data is available to both registered and non-registered users.
Use of these data is covered by the following licence: http://licences.ceda.ac.uk/image/data_access_condition/esacci_seaice_terms_and_conditions.pdf. When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

Data were processed by the ESA CCI Sea Ice project team.

The original ESMR tape archive data in swath projection have been made available online by NASA Goddard Earth Sciences Data and Information Services Center (GES DISC).
Data Quality:
The uncertainties and quality flags of the sea ice concentration are included in the netCDF files.
File Format:
Data are in NetCDF format.

Related Documents

 Product Validation and Intercomparison Report - ESMR Sea Ice Concentration
 Product User Guide (PUG) - ESMR Sea Ice Concentration
 ESA CCI Sea Ice project website
 ESA Climate Change Initiative website
 Algorithm Theoretical Basis Document (ATBD) - ESMR Sea Ice Concentration

Process overview

This dataset was generated by a combination of instruments deployed on platforms and computations as detailed below.

Instrument/Platform pairings

ESMR Deployed on: NIMBUS 5 satellite

Computation Element: 1

Title DTU Space ESMR NIMBUS-5 algorithm
Abstract Sea ice concentration is obtained from ESMR passive microwave satellite data over the polar regions. The processing chain features: 1) dynamic tuning of tie-points and algorithms, 2) correction of atmospheric noise using a Radiative Transfer Model, 3) computation of per-pixel uncertainties, and 4) one channel sea ice concentration algorithm.
Input Description None
Output Description None
Software Reference None
Output Description

None
  • units: K
  • var_id: Tb
  • long_name: (uncorrected) brightness temperatures
  • var_id: Lambert_Azimuthal_Grid
  • units: %
  • long_name: algorithm uncertainty (one standard deviation) of concentration of sea ice
  • var_id: algorithm_standard_error
  • units: K
  • var_id: Tb_corr
  • long_name: corrected brightness temperatures
  • units: %
  • standard_name: sea_ice_area_fraction
  • var_id: ice_conc
  • long_name: fully filtered concentration of sea ice using atmospheric correction of brightness temperatures and open water filters
  • units: %
  • long_name: sea ice concentration estimates as retrieved by the algorithm, and that were edited away by the various filters
  • var_id: raw_ice_conc_values
  • units: %
  • long_name: smearing uncertainty (one standard deviation) of concentration of sea ice
  • var_id: smearing_standard_error
  • standard_name: sea_ice_area_fraction status_flag
  • var_id: status_flag
  • long_name: status flag bit array for sea ice concentration retrievals
  • var_id: time_bnds
  • units: %
  • standard_name: sea_ice_area_fraction standard_error
  • long_name: total uncertainty (one standard deviation) of concentration of sea ice
  • var_id: total_standard_error
  • units: km
  • standard_name: projection_x_coordinate
  • long_name: x coordinate of projection (eastings)
  • var_id: xc
  • units: km
  • standard_name: projection_y_coordinate
  • long_name: y coordinate of projection (northings)
  • var_id: yc

Co-ordinate Variables

  • units: degrees_north
  • standard_name: latitude
  • var_id: lat
  • long_name: latitude coordinate
  • units: degrees_east
  • standard_name: longitude
  • var_id: lon
  • long_name: longitude coordinate
  • standard_name: time
  • var_id: time
  • units: days
  • long_name: reference time of product
Coverage
Temporal Range
Start time:
1972-12-11T00:00:00
End time:
1977-05-10T23:59:59
Geographic Extent

 
90.0000°
  
-180.0000°
  
180.0000°
 
-90.0000°
  
Related parties
Authors (6)
Publishers (1)