Sea ice product samples
Revision as of 00:41, 15 December 2009 by WikiSysop (Created page with 'The EuroCryoClim Pilot Project demonstrator gives access to monthly sea ice concentration products for the northern hemisphere, covering the period from 1988 to 2007, and to two …')
The EuroCryoClim Pilot Project demonstrator gives access to monthly sea ice concentration products for the northern hemisphere, covering the period from 1988 to 2007, and to two climate change indicator products showing the sea ice extent for March and September of the same period.
The monthly products are based on daily products from the ongoing EUMETSAT OSI SAF reprocessing project for historical SSMR and SSM/I data. The reanalysis produce a consistent data set for sea ice concentration, ice edge and ice type, both swath data and daily accumulated data, going back to 1978. The resolution is 10 km.
Sea ice concentration (SIC)
The sea ice product files contain average sea ice concentration and the corresponding standard deviation per pixel during the period. In addition the product files contain fields for minimum and maximum concentration. These two fields are compiled of extreme values for each pixel and are thus not showing a global minimum/maximum situation.
The ice concentration fields take values from 0 % to 100 % according to the percentage of ice per pixel. Pixels over land, close to the coast or in an area of no satellite coverage are set to fill value. The figure below illustrates the appearance of sea ice products in the demonstrator. Should more than two days of satellite data be missing from the input files, no average field will be computed for this month. Some months may therefore contain a field of fill value only.
Sea ice extent (SIE)
The monthly sea ice concentration (SIC) files also contain information about the average sea ice area and average sea ice extent. The product is derived from the SIC product. No SIE products are currently available for demonstration.
==Climate change indicator products==
Two potential climate change indicator products showing time series for the sea ice extent for March and for September are shown in the following two figures. The sea ice extent values are inevitably underestimated due to the satellite sensor footprint and satellite inclination. These factors can be seen in the first figure in the form of missing observations in the polar region and along the coast. Even though the sea ice extent values are underestimated, trends can be seen in the figures.