Ice sheet growth under dirty conditions: implications of debris cover for early glaciation advances
2002 (English)In: Quaternary International, ISSN 1040-6182, Vol. 95-96, 35-42 p.Article in journal (Refereed) Published
Debris-covered glaciers respond differently to any given set of climatic conditions than clean glaciers. This difference stems from change in ablation rate caused by a debris cover, approaching zero ablation with sufficiently thick protective cover, a mechanism not yet considered in the context of ice sheet growth. Critical to applying the mechanism to ice sheets is supply of debris. We postulate that periods after major interglacials offer the best conditions for dirty advances. This is because the volume of debris, previously deposited and weathered in interglacial time, the latter a function of exposure length, should be at a maximum. Advances of dirty ice sheets generate landforms and in positions deviating from clean-ice advances under similar climatic conditions. Hence, inferences of both ice sheet properties inferred from such dirty ice advances and the climate conditions related to such advances must be cautious. Furthermore, modeling of past ice sheets must consider the effect of debris cover whenever indications exist for such a cover.
Place, publisher, year, edition, pages
2002. Vol. 95-96, 35-42 p.
Physical Geography Geology
IdentifiersURN: urn:nbn:se:su:diva-22973DOI: 10.1016/S1040-6182(02)00025-3OAI: oai:DiVA.org:su-22973DiVA: diva2:189837