Early last glacial maximum in the southern Central Andes reveals northward shift of the westerlies at ~39 ka
| Autor: | Peter W. Kubik, Heinz Veit, Roland Zech, Ch. Kull, Jana Zech |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
lcsh:GE1-350
Global and Planetary Change geography geography.geographical_feature_category Atmospheric circulation Stratigraphy lcsh:Environmental protection Paleontology Westerlies Last Glacial Maximum Deep sea Surface exposure dating lcsh:Environmental pollution Moraine Climatology lcsh:TD172-193.5 lcsh:TD169-171.8 Glacial period Precipitation 910 Geography & travel Geology lcsh:Environmental sciences |
| Zdroj: | Climate of the Past, Vol 7, Iss 1, Pp 41-46 (2011) Zech, Roland; Zech, Jana; Kull, Christoph; Kubrik, Peter W.; Veit, Heinz (2011). Early last glacial maximum in the southern Central Andes reveals northward shift of the westerlies at similar to 39 ka. Climate of the past, 7(1), pp. 41-46. Göttingen: Copernicus Publications 10.5194/cp-7-41-2011 Climate of the Past, 7 (1) |
| ISSN: | 1814-9324 1814-9332 |
| DOI: | 10.5194/cp-7-41-2011 |
| Popis: | 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. Climate of the Past, 7 (1) ISSN:1814-9324 ISSN:1814-9332 |
| Databáze: | OpenAIRE |
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