Diagnosing the imbalance of Glaciar Santa Rosa, Cordillera Raura, Peru
Abstract For Glaciar Santa Rosa, in the Cordillera Raura, Peru, the extent and volume are determined for 1980 and 1961 from topographic mapping, and for two undated earlier stages LME and MAX from moraines. The regime of the glacier in terms of ice flow and mass balance is evaluated for the 1977–83...
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Language: | English |
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Cambridge University Press (CUP)
1996
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Online Access: | http://dx.doi.org/10.1017/s002214300000407x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214300000407X |
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crcambridgeupr:10.1017/s002214300000407x 2024-09-09T19:49:01+00:00 Diagnosing the imbalance of Glaciar Santa Rosa, Cordillera Raura, Peru Ames, Alcides Hastenrath, Stefan 1996 http://dx.doi.org/10.1017/s002214300000407x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214300000407X en eng Cambridge University Press (CUP) Journal of Glaciology volume 42, issue 141, page 212-218 ISSN 0022-1430 1727-5652 journal-article 1996 crcambridgeupr https://doi.org/10.1017/s002214300000407x 2024-06-19T04:04:56Z Abstract For Glaciar Santa Rosa, in the Cordillera Raura, Peru, the extent and volume are determined for 1980 and 1961 from topographic mapping, and for two undated earlier stages LME and MAX from moraines. The regime of the glacier in terms of ice flow and mass balance is evaluated for the 1977–83 period. More than half of the water discharge from the glacier is not renewed by precipitation but supplied by the ice thinning. The rate of surface lowering of 2 m a −1 liquid-water equivalent corresponds to an energy amount for melting of 22 W m −2 . Sensitivity analyses of Glaciar Yanamarey in the nearby Cordillera Blanca show that such a decrease of energy available for melting could be produced by a cloudiness increase of one-tenth, an air temperature decrease of more than 2°C, a decrease in specific humidity of 1 g kg −1 , or some combination of heat-budget processes. Such changes in the atmospheric environment would be required to stabilize the glacier at its recent volume. As another indication of the recent imbalance, the maximum volume flux is found about 100 m below the equilibrium-line altitude. Under continuation of recent climatic conditions, the glacier may disappear within a few decades. These inferences coorroborate a recent assessment for the neighboring Cordillera Blanca. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Journal of Glaciology 42 141 212 218 |
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Open Polar |
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Cambridge University Press |
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English |
description |
Abstract For Glaciar Santa Rosa, in the Cordillera Raura, Peru, the extent and volume are determined for 1980 and 1961 from topographic mapping, and for two undated earlier stages LME and MAX from moraines. The regime of the glacier in terms of ice flow and mass balance is evaluated for the 1977–83 period. More than half of the water discharge from the glacier is not renewed by precipitation but supplied by the ice thinning. The rate of surface lowering of 2 m a −1 liquid-water equivalent corresponds to an energy amount for melting of 22 W m −2 . Sensitivity analyses of Glaciar Yanamarey in the nearby Cordillera Blanca show that such a decrease of energy available for melting could be produced by a cloudiness increase of one-tenth, an air temperature decrease of more than 2°C, a decrease in specific humidity of 1 g kg −1 , or some combination of heat-budget processes. Such changes in the atmospheric environment would be required to stabilize the glacier at its recent volume. As another indication of the recent imbalance, the maximum volume flux is found about 100 m below the equilibrium-line altitude. Under continuation of recent climatic conditions, the glacier may disappear within a few decades. These inferences coorroborate a recent assessment for the neighboring Cordillera Blanca. |
format |
Article in Journal/Newspaper |
author |
Ames, Alcides Hastenrath, Stefan |
spellingShingle |
Ames, Alcides Hastenrath, Stefan Diagnosing the imbalance of Glaciar Santa Rosa, Cordillera Raura, Peru |
author_facet |
Ames, Alcides Hastenrath, Stefan |
author_sort |
Ames, Alcides |
title |
Diagnosing the imbalance of Glaciar Santa Rosa, Cordillera Raura, Peru |
title_short |
Diagnosing the imbalance of Glaciar Santa Rosa, Cordillera Raura, Peru |
title_full |
Diagnosing the imbalance of Glaciar Santa Rosa, Cordillera Raura, Peru |
title_fullStr |
Diagnosing the imbalance of Glaciar Santa Rosa, Cordillera Raura, Peru |
title_full_unstemmed |
Diagnosing the imbalance of Glaciar Santa Rosa, Cordillera Raura, Peru |
title_sort |
diagnosing the imbalance of glaciar santa rosa, cordillera raura, peru |
publisher |
Cambridge University Press (CUP) |
publishDate |
1996 |
url |
http://dx.doi.org/10.1017/s002214300000407x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214300000407X |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 42, issue 141, page 212-218 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s002214300000407x |
container_title |
Journal of Glaciology |
container_volume |
42 |
container_issue |
141 |
container_start_page |
212 |
op_container_end_page |
218 |
_version_ |
1809918380771115008 |