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Global Low Resolution Sea Ice Drift

Development Near real time product

Gridded sea-ice drift vector fields obtained from satellite image processing. It is a low resolution product (62. resolution). Ice motion vectors with a time span of 48 hours are estimated by an advanced cross-correlation method (the Continuous MCC, CMCC). Several single-sensor products are available, along with a merged (multi-sensor) dataset. This near-real-time product is intended for routine monitoring and data assimilation. For climate application, please use the OSI SAF sea-ice drift Climate Data Record (OSI-455).

Identification
Acronym : GBL LR SIDR
Product navigator reference :

EO:EUM:DAT:MULT:GBL-LR-SIDR

OSI SAF producer : Norwegian Meteorological Institute
Identifier : OSI-405-d
Digital object identifier (DOI) 10.15770/EUM_SAF_OSI_NRT_2007
Acronym for EDC (APNM) : OSIDRGB
Citation : See at bottom
Characteristics
Processing level : L3
Satellite input : DMSP/SSMIS, Metop/ASCAT and GCOM-W/AMSR-2
Other input : ECMWF outputs
Temporal sampling : 1 per day
Central time : 12:00
Timeliness : ? The timeliness is the time elapsing from the sensing time of the last contributing file to the product dissemination to users. It is similar to the latency. 6 h
Spatial coverage : Global
Spatial sampling : 62.5 km
Projection : Polar stereographic
File Formats : HL FTP Server (NetCDF4)
Characteristics & methods : Single and multi sensor analysis.
Displacement after 48 hours in km.
Data Access

OSI SAF FTP server (last 31 days)

ftp://osisaf.met.no/prod/

Directory: ice/drift_lr/

OSI SAF FTP server (archive)

ftp://osisaf.met.no/archive/

Directory: ice/drift_lr/

OSI SAF Thredds

https://thredds.met.no/thredds/osisaf/osisaf.html

https://thredds.met.no/thredds/osisaf/osisaf_seaicedrift.html

EUMETSAT Multicast

EUMETCast

EUMETSAT Archive

EUMETSAT Data Centre

Direct link

Redistribution by Copernicus Marine Service

https://marine.copernicus.eu/

Direct link

Accuracy Requirements
Target accuracy : 5 km yearly std deviation on both x and y components after 48 hours displacement
Verification/validation method : Collocation with buoys
Applications and users
Usage : NWP and Ocean/Ice models, operational Met and Sea Ice services.
History
First date :
Full series temporal coverage : 2009-onwards
Detailed history :

The product series is operational since 2009:

  • version OSI-405 from 2009 to 2015
  • version OSI-405-b from 2015 to 30/05/2017
  • version OSI-405-c from 30/05/2017 onwards
  • version OSI-405-d to become operational early 2025
Citation
Citation : OSI SAF Global Low Resolution Sea Ice Drift, OSI-405-d, doi: 10.15770/EUM_SAF_OSI_NRT_2007. EUMETSAT Ocean and Sea Ice Satellite Application Facility. Data extracted from [distributor/distribution mean]: ([extracted period],) ([extracted domains],) accessed [download date]

The content within square brackets "[…]" is to be replaced with whatever distributor, period, domain or download date is relevant to the data being used. The "extracted period" and "extracted domains" are only needed if a subset of the data is being used.
Suggestions for "distributor/distribution mean": OSI SAF FTP server/the EUMETSAT Data Centre/EUMETCast/name and URL of a redistributor...
Comments

  • In 2017, a new variable, the product uncertainties, was introduced in the files for OSI-405-c: it provides an uncertainty value (aka expected accuracy) for each grid location, it holds the standard deviation of the uncertainty in the components of the ice drift displacement vectors.

    In 2025, for OSI-405-d, the changes are mainly technical :

    • output now in NetCDF4, instead of NetCDF3,
    • replace ASCAT Metop-B with Metop-C,
    • changes in the product global attributes.

    Please note also that OSI SAF products are licensed under the Creative Commons Attribution 4.0 International License (CC BY 4.0) by EUMETSAT. See OSI SAF usage policy and acknowledgement
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