| ABSTRACT: Ice cores that were recovered from the summit of Sajama mountain in Bolivia provide carbon-14-dated tropical records and extend to the Late Glacial Stage (LGS). Oxygen isotopic ratios of the ice decreased 5.4 per mil between the Early Holocene and Last Glacial Maximum, which is consistent with values from other ice cores. The abrupt onset and termination of a Younger Dryas-type event suggest atmospheric processes as the probable drivers. Regional accumulation increased during the LGS, during deglaciation and over the past 3000 years, which is concurrent with higher water levels in regional paleolakes. Unlike polar cores, Sajama glacial ice contains eight times less dust than the Holocene ice, which reflects wetter conditions and extensive snow cover. |
| DATA: Download Sajama Data from the WDC Paleo Archive: Data Description d18O, Particle, and Ion Data presented as 5, 3, and 0.5 meter averages or 100-yr averages
Accumulation Reconstruction ,
Age Model,
Sowers' d18Oatm data, plus |
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To read or view the full study, please visit the
Science website. It was published in Science Volume 282(5295), 1858-1864, 1998. |
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Contact Us National Oceanic and Atmospheric Administration 12 Sept 2001
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