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Early last glacial maximum in the southern Central Andes reveals northward shift of the westerlies at ~39 ka
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| Zeitschriftentitel: | Climate of the Past |
|---|---|
| Personen und Körperschaften: | , , , , |
| In: | Climate of the Past, 7, 2011, 1, S. 41-46 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
Copernicus GmbH
|
| Schlagwörter: |
| author_facet |
Zech, R. Zech, J. Kull, Ch. Kubik, P. W. Veit, H. Zech, R. Zech, J. Kull, Ch. Kubik, P. W. Veit, H. |
|---|---|
| author |
Zech, R. Zech, J. Kull, Ch. Kubik, P. W. Veit, H. |
| spellingShingle |
Zech, R. Zech, J. Kull, Ch. Kubik, P. W. Veit, H. Climate of the Past Early last glacial maximum in the southern Central Andes reveals northward shift of the westerlies at ~39 ka Paleontology Stratigraphy Global and Planetary Change |
| author_sort |
zech, r. |
| spelling |
Zech, R. Zech, J. Kull, Ch. Kubik, P. W. Veit, H. 1814-9332 Copernicus GmbH Paleontology Stratigraphy Global and Planetary Change http://dx.doi.org/10.5194/cp-7-41-2011 <jats:p>Abstract. The latitudinal position of the southern westerlies has been suggested to be a key parameter for the climate on Earth. According to the general notion, the southern westerlies were shifted equatorward during the global Last Glacial Maximum (LGM: ~24–18 ka), resulting in reduced deep ocean ventilation, accumulation of old dissolved carbon, and low atmospheric CO2 concentrations. In order to test this notion, we applied surface exposure dating on moraines in the southern Central Andes, where glacial mass balances are particularly sensitive to changes in precipitation, i.e. to the latitudinal position of the westerlies. Our results provide robust evidence that the maximum glaciation occurred already at ~39 ka, significantly predating the global LGM. This questions the role of the westerlies for atmospheric CO2, and it highlights our limited understanding of the forcings of atmospheric circulation. </jats:p> Early last glacial maximum in the southern Central Andes reveals northward shift of the westerlies at ~39 ka Climate of the Past |
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10.5194/cp-7-41-2011 |
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Copernicus GmbH, 2011 |
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| title |
Early last glacial maximum in the southern Central Andes reveals northward shift of the westerlies at ~39 ka |
| title_unstemmed |
Early last glacial maximum in the southern Central Andes reveals northward shift of the westerlies at ~39 ka |
| title_full |
Early last glacial maximum in the southern Central Andes reveals northward shift of the westerlies at ~39 ka |
| title_fullStr |
Early last glacial maximum in the southern Central Andes reveals northward shift of the westerlies at ~39 ka |
| title_full_unstemmed |
Early last glacial maximum in the southern Central Andes reveals northward shift of the westerlies at ~39 ka |
| title_short |
Early last glacial maximum in the southern Central Andes reveals northward shift of the westerlies at ~39 ka |
| title_sort |
early last glacial maximum in the southern central andes reveals northward shift of the westerlies at ~39 ka |
| topic |
Paleontology Stratigraphy Global and Planetary Change |
| url |
http://dx.doi.org/10.5194/cp-7-41-2011 |
| publishDate |
2011 |
| physical |
41-46 |
| description |
<jats:p>Abstract. The latitudinal position of the southern westerlies has been suggested to be a key parameter for the climate on Earth. According to the general notion, the southern westerlies were shifted equatorward during the global Last Glacial Maximum (LGM: ~24–18 ka), resulting in reduced deep ocean ventilation, accumulation of old dissolved carbon, and low atmospheric CO2 concentrations. In order to test this notion, we applied surface exposure dating on moraines in the southern Central Andes, where glacial mass balances are particularly sensitive to changes in precipitation, i.e. to the latitudinal position of the westerlies. Our results provide robust evidence that the maximum glaciation occurred already at ~39 ka, significantly predating the global LGM. This questions the role of the westerlies for atmospheric CO2, and it highlights our limited understanding of the forcings of atmospheric circulation.
</jats:p> |
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| description | <jats:p>Abstract. The latitudinal position of the southern westerlies has been suggested to be a key parameter for the climate on Earth. According to the general notion, the southern westerlies were shifted equatorward during the global Last Glacial Maximum (LGM: ~24–18 ka), resulting in reduced deep ocean ventilation, accumulation of old dissolved carbon, and low atmospheric CO2 concentrations. In order to test this notion, we applied surface exposure dating on moraines in the southern Central Andes, where glacial mass balances are particularly sensitive to changes in precipitation, i.e. to the latitudinal position of the westerlies. Our results provide robust evidence that the maximum glaciation occurred already at ~39 ka, significantly predating the global LGM. This questions the role of the westerlies for atmospheric CO2, and it highlights our limited understanding of the forcings of atmospheric circulation. </jats:p> |
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| spelling | Zech, R. Zech, J. Kull, Ch. Kubik, P. W. Veit, H. 1814-9332 Copernicus GmbH Paleontology Stratigraphy Global and Planetary Change http://dx.doi.org/10.5194/cp-7-41-2011 <jats:p>Abstract. The latitudinal position of the southern westerlies has been suggested to be a key parameter for the climate on Earth. According to the general notion, the southern westerlies were shifted equatorward during the global Last Glacial Maximum (LGM: ~24–18 ka), resulting in reduced deep ocean ventilation, accumulation of old dissolved carbon, and low atmospheric CO2 concentrations. In order to test this notion, we applied surface exposure dating on moraines in the southern Central Andes, where glacial mass balances are particularly sensitive to changes in precipitation, i.e. to the latitudinal position of the westerlies. Our results provide robust evidence that the maximum glaciation occurred already at ~39 ka, significantly predating the global LGM. This questions the role of the westerlies for atmospheric CO2, and it highlights our limited understanding of the forcings of atmospheric circulation. </jats:p> Early last glacial maximum in the southern Central Andes reveals northward shift of the westerlies at ~39 ka Climate of the Past |
| spellingShingle | Zech, R., Zech, J., Kull, Ch., Kubik, P. W., Veit, H., Climate of the Past, Early last glacial maximum in the southern Central Andes reveals northward shift of the westerlies at ~39 ka, Paleontology, Stratigraphy, Global and Planetary Change |
| title | Early last glacial maximum in the southern Central Andes reveals northward shift of the westerlies at ~39 ka |
| title_full | Early last glacial maximum in the southern Central Andes reveals northward shift of the westerlies at ~39 ka |
| title_fullStr | Early last glacial maximum in the southern Central Andes reveals northward shift of the westerlies at ~39 ka |
| title_full_unstemmed | Early last glacial maximum in the southern Central Andes reveals northward shift of the westerlies at ~39 ka |
| title_short | Early last glacial maximum in the southern Central Andes reveals northward shift of the westerlies at ~39 ka |
| title_sort | early last glacial maximum in the southern central andes reveals northward shift of the westerlies at ~39 ka |
| title_unstemmed | Early last glacial maximum in the southern Central Andes reveals northward shift of the westerlies at ~39 ka |
| topic | Paleontology, Stratigraphy, Global and Planetary Change |
| url | http://dx.doi.org/10.5194/cp-7-41-2011 |