Converting glacier mass change without changing the claim

Glacier change can be expressed per unit area, as total mass, or as a global mean sea-level equivalent, but these quantities support different comparisons. This methods note synthesises the IACS mass-balance glossary, World Glacier Monitoring Service reporting, and NASA sea-level explanations. Fictional glacier calculations demonstrate how rankings reverse between specific and total loss, how sign conventions change between glacier and ocean accounts, and how area uncertainty affects a conversion. The discussion separates rates from cumulative change, water equivalent from surface lowering, and global accounting from local relative sea level. It supplies no original ice-budget estimate or attribution. Its practical result is a reporting sequence that retains dates, area convention, boundary, original units, and uncertainty so a useful translation does not silently become a different scientific claim.