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Excerpt

The sea-ice thickness processing chain generates higher level data products (such as maps) from measurements along the ground track of the satellite. Sea-ice thickness information is therefore available at different data levels that differ in the extent and resolution of the corresponding dataset.

Table of Contents
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Daily Trajectory Summary
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l2p-trajectory-doc
l2p-trajectory-doc

Data LevelLevel-2 Post-Processed (L2P)
Data PeriodDaily (between 00:00:00 and 23:59:59.999 UTC)
Summary

Collection of daily along-track geophysical parameters and their uncertainties at full resolution of the altimeter.  

Product only includes data points with valid freeboard measurements.

ParametersAll fields are per single altimeter data point
  • time
  • longitude
  • latitude
  • radar mode
  • radar freeboard + uncertainty
  • freeboard + uncertainty
  • snow depth + uncertainty
  • snow density + uncertainty
  • sea ice type + uncertainty
  • sea ice thickness + uncertainty

Daily L2P product example

Figure: Example of daily sea-ice thickness point measurements at along-track resolution

Space-Time Grid

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l3c-grid-doc

Data Level

Level-3 Colocated (L3C)

Data Period

Weekly (Monday 00:00:00 and Sunday 23:59:59.999 UTC)

Monthly (between 00:00:00 first day and 23:59:59.999 UTC last day of the month)

Custom (between 00:00:00 first day and 23:59:59.999 UTC last day)

SummaryGridded geophysical parameters, their uncertainties, retrieval area statistics and flags
ParametersTime / Geolocation
  • longitude (grid cell center notation)
  • latitude (grid cell center notation)
  • grid x position in projection coordinates
  • grid y position in projection coordinates
  • time bounds
  • reference time

Geophysical fields (per grid cell)

  • mean sea surface
  • sea ice concentration
  • sea surface anomaly + uncertainty
  • radar freeboard + uncertainty
  • freeboard + uncertainty
  • snow depth + uncertainty
  • snow density + uncertainty
  • sea ice type + uncertainty
  • sea ice thickness + uncertainty

Flags (per grid cell)

  • Number of all input data points
  • Number of valid (ice or lead) data points
  • Fraction of ice data points per valid data points
  • Fraction of lead data points per valid data points
  • Retrieval status flag
  • Retrieval quality flag

Weekly Gridded (L3C) data example

Figure: Example of weekly gridded sea-ice thickness product

Monthly gridded (L3C) data example

Figure: Example of monthly gridded sea-ice thickness product