Equilibrium line altitudes of late Pleistocene and recent glaciers in Central Mexico

Auteur :
WHITE, S. E.

Description :
Existing and former equilibrium line altitudes (ELAs) are calculated for present and past glaciers on volcanoes Iztaccihuatl, Popocatépetl and Ajusco. ELAs for past substages of glaciation on Iztaccihuatl were 1370 m below present ELA (during Tomicoxco Substage), 100 m below (Diamantes First Advance), 910 m below (Diamantes Second Advance), about 720 m below (Alcalican I), about 630 m below (Alcalican II), and 245 m below (Ayolotepito Stade). Mid-Neoglaciation ELA on Popocatépetl was 195 m below present ELA, and Late Neoglaciation (1906) ELA 90 m below. Late Pleistocene and Recent temperature coolings to accomplish these glaciations are about 8 C during probable Bull Lake equivalents, about 6, 5, and 4 C during Pinedale equivalents, and about 1.5 to 0.5 C during Neoglaciation Stades.


Type de document :
Article de périodique

Source :
Geografiska annaler Serie A physical geography Stockholm, 1981, vol. 63, n°. 3-4, p. 241-249, Références bibliographiques : 17 réf.

Date :
1981