【摘要】 通过对1999年所采错鄂CE 1孔自生碳酸盐碳、氧同位素与1955—1999年器测温度降水资料的统计分析,获取了自生碳酸盐碳、氧同位素与气候要素的定量关系,并据此恢复了1770年以来该地区的古气候。结果表明,错鄂沉积物中自生方解石氧同位素与气温显示出较好的正相关性,而与降水相关性不明显;碳同位素刚好相反,它与降水负相关,而与气温相关性不显著。1770年以来,错鄂地区在20世纪初气候环境发生了根本的改变,1900年以前降水偏少,为沼泽环境,1900年后降水增加,湖泊发育;1900年前后气温开始上升,30年代后期气温达到峰值,50年代初气温稍有下降。1935—1999年平均气温较前一百多年升高了近1℃。所获结果有较好的区域对比性。更多还原

【Abstract】 The Cuo’e Lake is located in the central Tibetan Plateau. Sediment samples from gravity core CE1, collected in July 1999 were analyzed for carbon and oxygen isotope composition of authigenic calcite. The meteorological data from 1955 to 1999 were collected from Naqu meteorological station 40 km away from the lake. Analyses on statistical relationship between isotopes and climate data show that δ18O of authigenic calcite in the Cuo’e Lake is positively correlated with temperature and poorly correlated with precipitation, while δ13C is negatively correlated with precipitation and poorly correlated with temperature. The temperature and precipitation of central Tibetan Plateau since 1770AD were reconstructed using the regression analysis results of isotopes and climate data. 更多还原