...   ... go to
OSI SAF central
web portal 		 
 
    Your location: OSI SAF HL / Validation / Svalbard  
       
Sea Ice Validation:
• Greenland
• Svalbard
• Southern Hemisphere
• LowRes Ice Drift
      The Sea Ice service at met.no produce daily ice charts covering the Fram Strait to the Barents Sea with main emphasize on the areas around Svalbard. Areas where independent information (manual inspection of SAR, MODIS and AVHRR) are utilized are marked by the ice service. These are then collocated with the OSI SAF ice product. The focus is on areas close to the ice edge. Example of a used area is given in the figure below. To the left (1) a daily Sea Ice service product is show, to the right (2) a polygon with validation data from the same product is shown. Click at the image to enlarge.

Below tables with results from comparing the OSI SAF ice concentration and ice edge products are given. These validation resuls are representing areas close to the ice edge. Areas further into the Artic ice have not been included. Including these areas would have increased the validation "score". The validation results show the relative performance in the areas close to the ice edge and for example illustrates the problems finding the ice edge during late summer.

Validation results for Sea Ice Concentration product

OSI SAF Sea Ice Concentration product compared with met.no Ice Service (OSISAF - Ice service)
Source: oper , Product area: nh
Year Month Match +/- 10% (%) Match +/- 20% (%) Bias Std dev Num compared
2018 04 94.82 96.94 -1.63 6.63 165068
2018 05 95.33 96.33 -1.76 7.17 352512
2018 06 93.64 94.71 -2.33 8.27 462608
2018 07 92.20 93.21 -3.34 11.08 530629
2018 08 96.32 97.01 -1.32 6.43 591009
2018 09 98.09 98.61 -0.72 4.46 495207
2018 10 98.97 99.33 -0.37 2.82 582221
2018 11 98.22 98.79 -0.63 3.57 484838
2018 12 97.25 98.10 -0.99 4.60 347249
2019 01 95.84 97.05 -1.56 6.21 353016
2019 02 96.58 97.73 -1.32 5.86 299310
2019 03 96.06 97.11 -1.44 5.68 265844
2019 04 94.61 95.90 -1.94 7.15 273258
2019 05 94.66 95.82 -1.79 6.81 212648

Validation table updated at: 2019.05.26 16:14 UTC

Validation results for Sea Ice Edge product

OSI SAF Sea Ice Edge product compared with met.no Ice Service (OSISAF - Ice service)
Source: oper , Product area: nh
Year Month Match (%) OSI SAF underestimates OSI SAF overestimates Mean edge difference (km) Num compared
2018 04 98.36 1.07 0.57 11.53 303476
2018 05 97.77 1.19 1.04 14.05 620309
2018 06 97.70 1.64 0.66 24.86 699951
2018 07 94.85 4.96 0.19 33.00 704245
2018 08 98.32 1.24 0.44 27.93 717898
2018 09 99.19 0.33 0.48 20.69 600476
2018 10 99.29 0.17 0.54 9.86 739303
2018 11 98.73 0.69 0.58 12.48 650385
2018 12 98.19 0.77 1.04 12.94 554406
2019 01 98.12 1.15 0.73 13.52 657046
2019 02 97.94 1.01 1.05 10.82 611697
2019 03 97.91 1.25 0.84 16.31 563106
2019 04 97.59 1.43 0.99 17.75 564863
2019 05 97.94 1.06 1.00 18.59 418531

Validation table updated at: 2019.05.26 16:14 UTC

   
       
   

Updated May 21. 2019 - Webmaster Steinar Eastwood

 

...