Late Pleistocene equilibrium-line reconstructions in the northern Peruvian Andes
Boreas
By: D. T. Rodbell
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Abstract
ELA reconstructions using the toe-to-headwall-altitude ratio method for paleoglaciers in the Cordilleras Blanca and Oriental, northern Peruvian Andes indicate that ELAs during the last glacial maximum (LGM; marine isotope stage 2)) were c.4300 m in the Cordillera Blanca, c.3900-3600 m on the west side of the Cordillera Oriental, and c.3200 m on the east (Amazon Basin) side of the Cordillera Oriental. Comparison with estimated modern ELAs and glaciation thresholds indicate that ELA depression ranged from c.700 m in the Cordillera Blanca to c.1200 m on the east side of the Cordillera Oriental. Palynological evidence for drier conditions during the LGM in the tropical Andes suggests that ELA depression of this amount involved a temperature reduction (>5-6??C) that greatly exceeded the tropical sea-surface temperature depression estimates of CLIMAP (<2??C). The west to east increase in ELA depression during the LGM indicates that the steep modern precipitation gradients may have been even steeper during the LGM. -from Author
Suggested Citation
Rodbell, D.T., 1992, Late Pleistocene equilibrium-line reconstructions in the northern Peruvian Andes: Boreas, v. 21, no. 1, p. 43-52.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Late Pleistocene equilibrium-line reconstructions in the northern Peruvian Andes |
| Series title | Boreas |
| Volume | 21 |
| Issue | 1 |
| Year Published | 1992 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Boreas |
| First page | 43 |
| Last page | 52 |