A 14,000-year oxygen isotope record from diatom silica in two alpine lakes on Mt. Kenya
A 14,000-year oxygen isotope record from diatom silica in two alpine lakes on Mt. Kenya
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DOI：
10.1126/science.1059612
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发表时间：
2001-06-22
期刊：
影响因子：
56.9
通讯作者：
Ficken, KJ
中科院分区：
文献类型：
--
作者：
Barker, PA;Street-Perrott, FA;Ficken, KJ
氧同位素是热带地区气候变化的敏感示踪剂。在肯尼亚山上两个高山湖泊的14000年记录中，发现硅藻二氧化硅氧同位素比率的突变高达每毫升18次。热带山地同位素记录的解释是有争议的，特别是关于降水和温度的相对作用。在此，我们认为湖泊水分平衡比温度分馏更能解释三角洲O-18全新世的变化。强对流降水的发生时间类似于11100 ~ 8600年、6700 ~ 5600年、2900 ~ 1900年
Oxygen isotopes are sensitive tracers of climate change in tropical regions. Abrupt shifts of up to 18 per mil in the oxygen isotope ratio of diatom silica have been found in a 14,000-year record from two alpine Lakes on Mt. Kenya. Interpretation of tropical-montane isotope records is controversial, especially concerning the relative roles of precipitation and temperature. Here, we argue that Holocene variations in delta O-18 are better explained by Lake moisture balance than by temperature-induced fractionation. Episodes of heavy convective precipitation dated similar to 11,100 to 8600, 6700 to 5600, 2900 to 1900, and