Other estimates are 50-100 million tons for the sulfur dioxide yield and 23 or 26-55 million tons for the sulfur. In Antarctica the sulfur yield was estimated to be about one-third that of the 1815 Tambora eruption, although the climate impact in the northern Hemisphere might have been aggravated by the distribution of the aerosols; at one Antarctic site the Huaynaputina sulfate layer is thicker than the one from Tambora. Petrological data usually yield a higher sulfur output than ice core data; this may reflect either ice cores underestimating the amount of sulfur erupted as ice cores only record stratospheric sulfur, ice cores underestimating the amount of sulfur for other reasons or overestimating the amount of sulfur contained within magma-associated fluids. The Huaynaputina eruption was probably unusually rich in sulfur compared to its volume.