Description of the files:

alaska_yyyyjjj.nc contains the 10 h Dead fuel moisture content over Alaska for the year yyyy and the day of the year jjj
lfmc_alaska_yyyyjjj.nc contains the Live fuel moisture content over Alaska for the year yyyy and the day of the year jjj

composite_alaska_yyyyjjj.nc contains the 10 h Dead fuel moisture content over Alaska for year yyyy and day of the year jjj with gaps filled with previous retrievals (up to a max of 30 days)
composite_lfmc_alaska_yyyyjjj.nc contains the live fuel moisture content over Alaska for year yyyy and day of the year jjj with gaps filled with previous retrievals (up to a max of 30 days)