Welcome to the Cryosphere Observing System (“CryOS”) blog. This is a place to express your thoughts about how we observe, measure, and assess the cryosphere. The focus is on the Integrated Global Observing Strategy (IGOS) Cryosphere Theme and its role in the Global Earth Observation System of Systems (GEOSS) framework. The blog is not a general forum, although you can leave comments. Here you can present an argument, concept, or philosophy relevant to CryOS without needing an answer. It is, therefore, more of a one-way presentation of a well-developed idea than an n-way discussion.