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迄今,人们只是利用气候替代性指标与单个气候因子的线性关系估算古气候的,或者利用趋势面分析方法,建立了气候替代性指标与两个气候因子的非线性方程,而没能够真正用于古气候参数的估算.地质记录中物理的、化学的、生物的气候替代性指标是互相影响的.每一种气候替代性指标又会同时受到多种气候因子的控制.如果能找到它们之间在多种气候因子同时控制下的气候平衡点,就有希望解决利用不同气候指标单独恢复古气候时可能出现的矛盾.本文试图做这方面的努力:首先建立现代沉积环境中物理的、化学的、生物的气候指标同时与多个气候参数之间的非线性方程,只要方程数大于(或等于)变量(气候因子)数,在给定的初值条件下,代入相应的古气候指标,求解方程组,可以同时得到一组气候因子的解,从而完成综合古气候指标的非线性反演.1 材料与方法本文采用的黄土高原的现代表层土壤样品的磁化率值63个,全氧化铁样品12个(其中11个样品采用文献[4]的资料),蜗牛样品28个,分别作为物理、化学和生物的气候指标.对洛川坡头黄土剖面Sl以上的地层间隔10cm采样,同时做磁化率、全氧化铁和蜗牛化石分析.其中表层土壤和黄土剖面中蜗牛化石的采样利用筛析法(筛孔0.5mm)获取了包括大量小个体蜗牛的化石组合.
So far, the paleoclimate has been estimated using only the linear relationship between the climate proxy index and the individual climatic factor, or the nonlinear equations of the climatic proxy index and the two climatic factors have been established by the trend surface analysis Paleoclimate parameter estimation. The physical, chemical and biological alternatives to climate in geologic records influence each other, and each alternative indicator of climate will be controlled by multiple climatic factors at the same time .If it can be found between them In the climate balance point under the simultaneous control of a variety of climate factors, there is hope to solve the contradictions that may occur when restoring the paleoclimate independently with different climatic indicators.This paper tries to do the work in this area: Firstly, to establish the physical and chemical , Biological climate indicators and multiple climate parameters simultaneously with the non-linear equation, as long as the equation is greater than (or equal to) variables (climate factors), under the given initial conditions, the corresponding paleoclimatic indicators, the solution Equations, which can simultaneously get a set of climatic factor solution, thus completing the comprehensive paleoclimatic index of the nonlinear inversion .1 materials and methods The magnetic susceptibility values of modern surface soil samples used in the Loess Plateau are 63, 12 samples of ferric oxide (11 of them are from literature [4]) and 28 samples of snails, respectively, as the physical, chemical and biological climate Indicators of the Luochuanpo loess section S1 above the strata interval sampling 10cm, while doing magnetic susceptibility, ferroferric oxide and snail fossil analysis.The surface soil and loess profile snail fossil sampling using sieve method (sieve 0.5mm ) Get the fossil combination that includes a large number of small individual snails.