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Dataset

 

ESA Sea Ice Climate Change Initiative (Sea Ice CCI): Northern Hemisphere Sea Ice Concentration (SIC) from the AMSR-E instrument, Version 1.11

Status: Historicalarchive
Online Status: ONLINE
Publication State: Published
Publication Date: 2016-03-08
Download Stats: last 12 months

Abstract

This data set is part of the ESA Sea Ice Climate Change Initiative (CCI) project. The dataset provides sea ice concentration for the Arctic region, derived from the AMSR-E satellite instrument.

It consists of daily gridded SIC fields based on Passive Microwave Radiometer measurements from the AMSR-E instrument with a 25km grid spacing, along with the total standard error (uncertainty) and quality control flags. It has been built upon the algorithms and processing software originally developed at the EUMETSAT OSI SAF for their SIC dataset.

Please note, in the sea ice concentration data set - on purpose - no weather filter has been applied to eliminate weather-induced spurious ice in the open ocean along the ice edge in order to avoid discarding regions with a real sea ice cover. Users are advised to read the product user guide and the publication by Ivanova et al. [2015] (see documentation section).

A second sea ice dataset has also been produced from the SSM/I instrument, and these should be regarded as individual datasets and not combined without further investigations about the compatibility.
The project team warns potential users that the AMSR-E SIC time-series is less mature than the SSM/I one, and that the former should be used with extra care, possibly after visual inspection or comparison to other data sources (such as the SSM/I time series during the overlap period).

Citable as:  Toudal Pedersen, L.; Dybkjær, G.; Heygster, G.; Ivanova, N.; Kern, S.; Lavergne, T.; Rösel, A.; Saldo, R.; Sandven, S.; Sørensen, A.; Tonboe, R.T. (2016): ESA Sea Ice Climate Change Initiative (Sea Ice CCI): Northern Hemisphere Sea Ice Concentration (SIC) from the AMSR-E instrument, Version 1.11. Centre for Environmental Data Analysis, date of citation. https://catalogue.ceda.ac.uk/uuid/0bf2a301eeba46dfa16668b716d02ab5
Abbreviation: Not defined
Keywords: Sea Ice, ESA, CCI, Arctic

Details

Previous Info:

2017-06-20 This data has now been superceded by a later version (see http://catalogue.ceda.ac.uk/uuid/bc3f8a3cf94c4d0180a60b7e2bfd9c5b an… Show More 2017-06-20 This data has now been superceded by a later version (see http://catalogue.ceda.ac.uk/uuid/bc3f8a3cf94c4d0180a60b7e2bfd9c5b and http://catalogue.ceda.ac.uk/uuid/8a45e78c4657438997617c726337dffc)
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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.

Contribution of the EUMETSAT OSI SAF to the production of this dataset is acknowledged. EUMETSAT OSI SAF provided access and allowed re-use of its SIC reprocessing software and data hosting facilities. The reprocessing chain was further updated with the new algorithms and knowledge from the ESA CCI Sea Ice project.

Data was supplied to CEDA in the context of the ESA CCI Open Data Portal Project

File Format:
Data is in NetCDF format

Process overview

This dataset was generated by instruments deployed on platforms as listed below.
Output Description None
  • var_id: Lambert_Azimuthal_Grid
  • units: %
  • long_name: algorithm uncertainty (one standard deviation) of concentration of sea ice
  • var_id: algorithm_standard_error
  • names: algorithm uncertainty (one standard deviation) of concentration of sea ice
  • units: %
  • standard_name: sea_ice_area_fraction
  • long_name: concentration of sea ice
  • var_id: ice_conc
  • names: sea_ice_area_fraction, concentration of sea ice
  • units: %
  • long_name: concentration of sea ice (values retrieved outside [0% - 100%] validity range)
  • var_id: ice_conc_off_range
  • names: concentration of sea ice (values retrieved outside [0% - 100%] validity range)
  • units: %
  • long_name: smearing uncertainty (one standard deviation) of concentration of sea ice
  • var_id: smearing_standard_error
  • names: smearing uncertainty (one standard deviation) of concentration of sea ice
  • long_name: status flag for sea ice concentration retrieval
  • standard_name: sea_ice_area_fraction status_flag
  • var_id: status_flag
  • names: status flag for sea ice concentration retrieval, sea_ice_area_fraction status_flag
  • 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
  • names: sea_ice_area_fraction standard_error, total uncertainty (one standard deviation) of concentration of sea ice
  • units: km
  • standard_name: projection_x_coordinate
  • long_name: x coordinate of projection (eastings)
  • var_id: xc
  • names: projection_x_coordinate, x coordinate of projection (eastings)
  • units: km
  • standard_name: projection_y_coordinate
  • long_name: y coordinate of projection (northings)
  • var_id: yc
  • names: projection_y_coordinate, y coordinate of projection (northings)

Co-ordinate Variables

  • units: degrees_north
  • standard_name: latitude
  • var_id: lat
  • long_name: latitude coordinate
  • names: latitude, latitude coordinate
  • units: degrees_east
  • standard_name: longitude
  • var_id: lon
  • long_name: longitude coordinate
  • names: longitude, longitude coordinate
  • standard_name: time
  • var_id: time
  • long_name: reference time of product
  • names: time, reference time of product
Coverage
Temporal Range
Start time:
2002-06-18T23:00:00
End time:
2011-10-03T22:59:59
Geographic Extent

 
90.0000°
 
-180.0000°
 
180.0000°
 
16.6000°