The National Snow and Ice Data Center
Arctis recommends NSIDC daily updated icemaps and their analysis.
"The National Snow and Ice Data Center (NSIDC) supports research into our world's frozen realms: the snow, ice, glaciers, frozen ground, and climate interactions that make up Earth's cryosphere.
NSIDC manages and distributes scientific data, creates tools for data access, supports data users, performs scientific research, and educates the public about the cryosphere.
NSIDC distributes more than 500 cryospheric data sets for researchers, from both satellite and ground observations."