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A universal calibration function for determination of soil moisture with cosmic-ray neutrons

机译：宇宙射线中子测定土壤水分的通用校准功能

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摘要

A cosmic-ray soil moisture probe is usually calibrated locally using soil samples collected within its support volume. But such calibration may be difficult or impractical, for example when soil contains stones, in presence of bedrock outcrops, in urban environments, or when the probe is used as a rover. Here we use the neutron transport code MCNPx with observed soil chemistries and pore water distribution to derive a universal calibration function that can be used in such environments. Reasonable estimates of pore water content can be made from neutron intensity measurements and by using measurements of the other hydrogen pools (water vapor, soil lattice water, soil organic carbon, and biomass). Comparisons with independent soil moisture measurements at one cosmic-ray probe site and, separately, at 35 sites, show that the universal calibration function explains more than 79% of the total variability within each dataset, permitting accurate isolation of the soil moisture signal from the measured neutron intensity signal. In addition the framework allows for any of the other hydrogen pools to be separated from the neutron intensity measurements, which may be useful for estimating changes in biomass, biomass water, or exchangeable water in complex environments.
机译：宇宙射线土壤湿度探测器通常使用在其支持体积内收集的土壤样本进行局部校准。但是这样的校准可能是困难的或不切实际的，例如，当土壤中含有石头，在基岩露头存在的情况下，在城市环境中或当探针用作流动站时。在这里，我们将中子传输代码MCNPx与观察到的土壤化学性质和孔隙水分布一起使用，以得出可在此类环境中使用的通用校准函数。可以通过中子强度测量并通过使用其他氢气池（水蒸气，土壤晶格水，土壤有机碳和生物量）的测量值来合理估算孔隙水含量。与在一个宇宙射线探测器站点以及分别在35个站点进行的独立土壤湿度测量的比较表明，通用校准功能可解释每个数据集内超过79％的总变异性，从而可以将土壤湿度信号与测量的中子强度信号。另外，该框架允许将任何其他氢库与中子强度测量值分开，这对于估算复杂环境中的生物质，生物质水或可交换水的变化可能有用。

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