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Welcome to the NCEP sea ice concentration wiki!

• TN 120 -- original document, 1996
• TN 321 -- evolution 1996-2012
• cfsv2 ice
• TN 282 -- a posteriori filtering, 2009
• TN 301 -- reconciling land masks and coastlines, 2012
• [in progress]-- evolution 2012-2024

inputs

• Fixed
  • Land mask
  • a posteriori filter
  • daily climatology
• NRT Observations
  • SSMI (until 20NN, when instrument on DMSP F-15 failed)
  • SSMI-S (from 20NN to present) on F-17 and F-18
  • AMSR-e (20NN to 201NN)
  • AMSR2 (from 201NN to present)
  • SST (used for filtering bogus ice)
  • AVHRR (20NN to present, used for filtering bogus ice)
  • IMS mask (2024? to future -- also used for filtering bogus ice; 20NN to 2024? -- used when area has not been observed for too long to use (mask = 1) climatological ice concentration or zero (mask = 0) ice concentration

outputs

• L2

  • Bogus ice may be present
  • SSMI-S F-17, F-18; netcdf

• L3

  • Bogus ice may be present
  • Grib2 and (by conversion) grib1 format
  • SSMI-S F-17, F-18
    • Grids are 1/30 Bedient (~ 12.7 km), 1/15 Bedient (~ 25.4 km) polar stereographic
  • AMSR2, flat binary (8/2024) (to be netcdf)
    • Grid is 1/60 Bedient, ~ 6.3 km polar stereographic

• L4

  • Blended concentrations, gaps filled, bogus ice should not be present
  • Grids are
    • 5 arcmin lat-lon (1/12 degree) -- grib2
    • 30 arcmin latlon (1/2 degree) -- grib2, also distributed on GTS

• Support outputs

  • age (5 arcmin)

Build and Run

v4.6.0

misc-references