In this section, the 5 used algorithms to retrieve ice concentration will be
outlined.

Most algorithms are based on two simple equations:

where , and are the amount of open water, multi-year ice and first-year ice, respectively. is not to be confused with from equation 1. The second formula is:

where is the brightness
temperature and ,
and are the brightness
temperatures from open water, multi-year ice and first-year ice, respectively.

The algorithms will be addressed separately below.

- AES algorithm
- NORSEX algorithm
- Comiso (polarization) algorithm
- Comiso (frequency) algorithm
- NASA algorithm

Tim Flintholm Fink<tff@emi.dtu.dk>