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为探究福建玉华洞石笋δ18O的气候环境指示意义,于2011年7月~2013年12月,在将乐县天阶山逐月采集大气降水以及玉华洞3个滴水点和相对应的3个新生碳酸盐沉积物的样品,并进行氢氧同位素测试,分析δ18O在大气降水—洞内滴水—新生沉积物的传递过程及其变化规律.结果表明:3个滴水点的δD和δ18O均分布在当地大气降水线(δD=8.87δ18O+17.59(R2=0.97))附近,表明滴水的δD和δ18O体现了当地大气降水δD和δ18O的平均水平;沉积物δ18O的变化范围小于相对应的滴水δ18O变化范围,更小于洞外大气降水,但3者都呈现出夏秋季偏轻、冬春季偏重的季节性变化趋势;与逐月大气降水量对比发现,沉积物δ18O受月“降雨量效应”影响较少,沉积物δ18O主要受冬夏季降水水汽源地季节性差异的影响.总体而言,玉华洞沉积物δ18O值存在较明显的季节特征,其波动较好的继承了当地大气降水信息,玉华洞石笋δ18O可以用来重建季节性高分辨率的古气候记录.
To explore climate Environmental Implications of Fujian Yuhua Cave, δ18O, and in July 2011 - December 2013, in the Lok County Tianjie mountain monthly precipitation and collection Yuhua Cave three drops of water points and the corresponding 3 Samples of fresh sedimentary carbonate sediments and hydrogen and oxygen isotope tests were carried out to analyze the process and the variation of δ18O in the atmosphere-drip-new sediment.The results show that δD and δ18O (ΔD = 8.87δ18O + 17.59 (R2 = 0.97)), indicating that the δD and δ18O of the drip showed the average level of δD and δ18O in the local atmospheric precipitation. The δ18O of the sediment varied less than the corresponding drip δ18O variation, more precipitation is less than outside the cave, but three are lighter emerged in summer and autumn, winter and spring biased seasonal trends; a monthly atmospheric precipitation comparison, sediments δ18O by January “rainfall effect ”less impact, sediments δ18O mainly affected by seasonal differences in summer and winter precipitation moisture source. overall, there is obvious seasonal characteristics Yuhua Cave δ18O value of the deposit, which inherited the fluctuation good local atmosphere Precipitation information, Yuhua Stalagmite δ18O can be used to reconstruct the seasonal high-resolution paleoclimate records.