CMEMS Arctic MFC: Validation of sea ice drift

Validation results

Results by bulletin date
December 2011
12-28

January 2012
01-04
01-11
01-18
01-25

February 2012
02-01
02-08
02-15
02-22
02-29

March 2012
03-07
03-14
03-21
03-28

April 2012
04-04
04-11

June 2012
06-14
06-21
06-28

July 2012
07-05
07-12
07-19
07-26

August 2012
08-02
08-09
08-16
08-23
08-30

September 2012
09-06
09-13
09-20
09-27

October 2012
10-04
10-11
10-18
10-25

November 2012
11-01
11-08
11-15
11-22
11-29

December 2012
12-06
12-13
12-20
12-27

January 2013
01-03
01-10
01-17
01-24
01-31

February 2013
02-07
02-14
02-21
02-28

March 2013
03-07
03-14
03-21
03-28

April 2013
04-04
04-11
04-18
04-25

May 2013
05-02
05-09
05-16
05-23
05-30

June 2013
06-06
06-13
06-20
06-27

July 2013
07-04
07-11
07-18
07-25

August 2013
08-01
08-08
08-15
08-22
08-29

September 2013
09-05
09-12
09-19
09-26

October 2013
10-03
10-10
10-17
10-24
10-31

November 2013
11-07
11-14
11-21
11-28

December 2013
12-05
12-12
12-19
12-26

January 2014
01-02
01-09
01-16
01-23
01-30

February 2014
02-06
02-13
02-20
02-27

March 2014
03-06
03-13
03-20
03-27

April 2014
04-03
04-10
04-17
04-24

May 2014
05-01
05-08
05-15
05-22
05-29

June 2014
06-05
06-12
06-19
06-26

July 2014
07-03
07-10
07-17
07-24
07-31

August 2014
08-07
08-14
08-21
08-28

September 2014
09-04
09-11
09-18
09-25

October 2014
10-02
10-09
10-16
10-23
10-30

November 2014
11-06
11-13
11-20
11-27

December 2014
12-04
12-11
12-18
12-25

January 2015
01-01
01-08
01-15
01-22
01-29

February 2015
02-05
02-12
02-19
02-26

March 2015
03-05
03-12
03-19
03-26

April 2015
04-02
04-09
04-16
04-23
04-30

May 2015
05-07
05-14
05-21
05-28

June 2015
06-04
06-11
06-18
06-25

July 2015
07-02
07-09
07-16
07-23
07-30

August 2015
08-06
08-13
08-20
08-27

September 2015
09-03
09-10
09-17
09-24

October 2015
10-01
10-08
10-15
10-22
10-29

November 2015
11-05
11-12
11-19
11-26

December 2015
12-03
12-10
12-17
12-24
12-31

January 2016
01-07
01-14
01-21
01-28

February 2016
02-04
02-11
02-18
02-25

March 2016
03-03
03-10
03-17
03-24
03-31

April 2016
04-07
04-14
04-21
04-28

May 2016
05-05
05-12
05-19
05-26

June 2016
06-02
06-09
06-16
06-23
06-30

July 2016
07-07
07-14
07-21
07-28

August 2016
08-04
08-11
08-18
08-25

September 2016
09-01
09-08
09-15
09-22
09-29

October 2016
10-06
10-13
10-20
10-27

November 2016
11-03
11-10
11-17
11-24

December 2016
12-01
12-08
12-15
12-22
12-29

January 2017
01-05
01-12
01-19
01-26

February 2017
02-02
02-09
02-16
02-23

March 2017
03-02
03-09
03-16
03-23
03-30

April 2017
04-06
04-13
04-20
04-27

May 2017
05-04
05-11
05-18
05-25

June 2017
06-01
06-08
06-15
06-22
06-29

July 2017
07-06
07-13
07-20
07-27

August 2017
08-03
08-10
08-17
08-24
08-31

September 2017
09-07
09-14
09-21
09-28

October 2017
10-05
10-12
10-19
10-26

November 2017
11-02
11-09
11-16
11-23
11-30

December 2017
12-07
12-14
12-21
12-28

January 2018
01-04
01-11
01-18
01-25

February 2018
02-01
02-08
02-15
02-22

March 2018
03-01
03-08
03-15
03-22
03-29

April 2018
04-05
04-12
04-19
04-26

May 2018
05-03
05-10
05-17

Documentation

This web page contains information about the validation algorithm, the observational data, and the model results.

The validation results are produce for one-day ice drift by comparing drift distances from observations and model reults. The observations are available for periods that span 23-25 hours, sampled irregularly during each day. The model results are available as daily averages for each calendar day (UTC time). Note that tidal motion is not included in the model.

The observations are mapped onto the grid of the model results, which is on a polar stereographic projection, and drift distances in the model results are produced by integration of sea ice drift velocities.

Validation sectors

In order to take into account the differences in sampling, the drift distances from the observational product is scaled (linearly) to a 24 hour period. The validation algorithm then assigns weights according to the temporal distribution between the two calendar dates that are spanned by the observations. The model velocities are then integrated in two Eulerian steps: initially, the drift distance in the model is computed for the day fraction of the first calendar date, then, the subsequent drift during the second calendar date is found by integration of drift velocities at the end point of the trajectory from the initial step.

Validation data

Validation of the CMEMS Arctic MFC results for sea ice drift is performed using the observational product from the Division of Microwaves and Remote Sensing at the Technical University of Denmark. The data are available from the CMEMS Ocean Sea Ice Thematic Assembly Center (OSI TAC), and can be downloaded from the CMEMS Catalogue as SEAICE_GLO_SEAICE_L4_NRT_OBSERVATIONS_011_006 or from the THREDDS server.

These OSI TAC sea ice drift data are based on a pattern recognition algorithm which is applied to observations from Synthetic Aperture Radar (SAR) imagery.

The validation of sea ice drift is carried out for the full domain (i.e., the Arctic Basin and adjacent seas), and also for a sub-division into three sectors, as displayed in the figure on the right.

  • 65°W - 55°E (green sector)
  • 55°E - 175°E (blue sector)
  • 175°E - 65°W (red sector)

TOPAZ

The model results are produced with the TOPAZ ocean data assimilation model system. Presently, TOPAZ is run weekly with data assimillation one week prior to the bulletin date, followed by a one-week 100 member ensemble simulation ending on the bulletin date, and finally a 10 day deterministic forecast. TOPAZ was developed and is maintained by the Nansen Center.

TOPAZ results are available from the CMEMS Catalogue as ARCTIC_ANALYSIS_FORECAST_PHYS_002_001_a or from the THREDDS server as aggregated, best estimates, and as a list of Bulletin dates with separate forecasts.