Solar forcing of drought frequency in the Maya lowlands
Solar forcing of drought frequency in the Maya lowlands
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DOI：
10.1126/science.1057759
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发表时间：
2001-05-18
期刊：
影响因子：
56.9
通讯作者：
Guilderson, T
中科院分区：
文献类型：
--
作者：
Hodell, DA;Brenner, M;Guilderson, T
我们分析了墨西哥尤卡坦半岛的湖泊沉积物岩心，重建了该地区过去2600年的气候历史。对蒸发降水比（氧同位素和石膏降水）变化敏感的沉积物代用物的时间序列分析表明，干旱的周期性以208年为主要周期。这个周期与宇宙核素（碳-14和铍-10）产生的206年记录相似，后者被认为反映了太阳活动的变化。我们的结论是，尤卡坦干旱的一个重要组成部分是由太阳强迫解释的。此外，在208年干旱周期中的一些最大值与玛雅文化进化的不连续性相对应，表明玛雅人受到这些200年降水振荡的影响。
We analyzed lake-sediment cores from the Yucatan Peninsula, Mexico, to reconstruct the climate history of the region over the past 2600 years. Time series analysis of sediment proxies, which are sensitive to the changing ratio of evaporation to precipitation (oxygen isotopes and gypsum precipitation), reveal a recurrent pattern of drought with a dominant periodicity of 208 years. This cycle is similar to the documented 206-year period in records of cosmogenic nuclide production (carbon-14 and beryllium-10) that is thought to reflect variations in solar activity. We conclude that a significant component of century-scale variability in Yucatan droughts is explained by solar forcing. Furthermore, some of the maxima in the 208-year drought cycle correspond with discontinuities in Maya cultural evolution, suggesting that the Maya were affected by these bicentennial oscillations in precipitation.