Hard-water effect correction of lacustrine sediment ages using the relationship between <sup>14</sup>C levels in lake waters and in the atomosphere: the case of Lake Qinghai

Abstract

在深入探讨湖泊硬水效应成因和变化规律的基础上, 借鉴海洋碳库效应校正方法, 首次利用湖水和大气¹⁴C放射性比度之间关系的方法对青海湖沉积物¹⁴C年龄进行硬水效应校正, 并重建了青海湖硬水效应在过去8ka中的变化过程。笔者认为, 青海湖表层沉积物有机质¹⁴C年龄不老于1549 aBP, 青海湖硬水效应在7000-1000aBP期间是逐渐增强的。;On the basis of analyzing the nature and feature of hard-water effect, the hard-water effect calibration of sediment ¹⁴C ages of Lake Qinghai is carried out using the relationship between ¹⁴C levels in lake waters and the atmosphere , in the light of marine reservoir correction. The variation of the hard water effect in Lake Qinghai back to 8000 aBP is also reconstructed. It’s concluded that ¹⁴C ages of the surface sediment in Lake Qinghai is less than 1549 aBP and the hard-water effect of Lake Qinghai increased evidently during 7000-1000aBP.