Huascaran δ 18 O as an indicator of tropical climate during the Last Glacial Maximum
Abstract. The interpretation of the isotopic composition of Andes tropical mountain glaciers is reconsidered using a simple Rayleigh distillation model. It is shown that Andes snowline depression and Huascaran ice core δ 18 O are consistent with a 3 ◦ C drop in sea surface temperature during the Las...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.80.7268 http://geosci.uchicago.edu/~rtp1/papers/GRLhuascaran/GL714W01.pdf |
| Summary: | Abstract. The interpretation of the isotopic composition of Andes tropical mountain glaciers is reconsidered using a simple Rayleigh distillation model. It is shown that Andes snowline depression and Huascaran ice core δ 18 O are consistent with a 3 ◦ C drop in sea surface temperature during the Last Glacial Maximum, accompanied by an increase from 40 % at present to 60 % during the LGM in the annual mean proportion of atmospheric water lost to continental runoff. Broecker’s interpretation of Huascaran δ 18 O as a paleo-hygrometer is discussed. 1. |
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