Late Holocene climate and cultural changes in the southwestern United States
Late Holocene climate and cultural changes in the southwestern United States
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DOI：
10.1126/science.1062771
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发表时间：
2001-10-05
期刊：
影响因子：
56.9
通讯作者：
Asmerom, Y
中科院分区：
文献类型：
--
作者：
Polyak, VJ;Asmerom, Y
在全新世晚期，瓜达卢佩山脉洞穴中的柱状石笋记录了美国西南部4000年的气候历史。年环带、间断和高精度铀系测年显示，在全新世中期较为干燥之后，4000年至3000年前的气候类似于现在。3000年至800年前的一个明显更潮湿和更凉爽的时期之后是一个类似于现在的白天条件的时期，除了440年至290年前的一个稍微潮湿的时期。石笋记录与原住民文化活动变化的考古记录有很好的相关性。这种气候变化可能有助于解释住房废弃和人口重新分布的证据。
Columnar stalagmites in caves of the Guadalupe Mountains during the late Holocene record a 4000-year annually resolved climate history for the southwestern United States. Annual banding, hiatuses, and high-precision uranium-series dating show a present day-like climate from 4000 to 3000 years ago, following a drier middle Holocene. A distinctly wetter and cooler period from 3000 to 800 years ago was followed by a period of present day-like conditions, with the exception of a slightly wetter interval from 440 to 290 years before the present. The stalagmite record correlates well with the archaeological record of changes in cultural activities of indigenous people. Such climate change may help to explain evidence of dwelling abandonment and population redistribution.