Modelling soil temperatures in northern peatlands
Modelling soil temperatures in northern peatlands
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DOI：
10.1111/j.1365-2389.2007.01000.x
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发表时间：
2008-04
影响因子：
4.2
通讯作者：
N. Kettridge;A. Baird
中科院分区：
文献类型：
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作者：
N. Kettridge;A. Baird
北方泥炭地的甲烷排放强烈依赖于土壤温度。因此，为了预测未来气候条件下北方泥炭地的甲烷排放量，模拟这些变化的气候条件对泥炭温度的影响是很重要的。本文报告了两个一维（1D）模型的开发和测试，用于模拟北方泥炭地浅层土壤温度。首先，HIP‐Dlet（Heat in Peat - Dirichlet）模型将测量温度应用于基于传导的温度模型的表面边界。其次，HIP-Nmann（Heat in Peat - von Neumann）模型模拟了标准气象测量的表面边界。HIP‐Dlet模型提供了一个合理的测量温度的近似值，表明土壤内的热传输过程得到了充分模拟。该模型不模拟平流液体热通量。然而，研究期间只有大量降雨事件（3天内> 70毫米）才会对模型误差产生显着影响。HIP-Nmann模型的误差幅度与HIP-Dlet模型相似。HIP-Dlet模型中的误差主要来自测量土壤温度的误差。HIP-Nmann中的误差是由于测量的土壤温度的误差和表面边界条件的不准确模拟。因此，未来泥炭地温度模型的发展应侧重于表面边界条件的模拟，特别是表面电阻的参数化，这里显示出在模拟土壤温度中产生显着的误差。
Methane emissions from northern peatlands are strongly dependent on soil temperatures. Therefore, to predict methane emissions from northern peatlands under future climatic conditions, it is important to simulate the effect of these changing climatic conditions on peat temperatures. This article reports on the development and testing of two one‐dimensional (1D) models used to simulate soil temperatures at shallow depths in a northern peatland. First, the HIP‐Dlet (Heat in Peat – Dirichlet) model applies measured temperatures to the surface boundary of a conduction‐based temperature model. Secondly, the HIP‐Nmann (Heat in Peat – von Neumann) model simulates the surface boundary from standard meteorological measurements. The HIP‐Dlet model provides a reasonable to good approximation of measured temperatures showing that heat transport processes within the soil are adequately simulated. The model does not simulate an advective liquid heat flux. However, only substantial rainfall events (> 70 mm over 3 days) during the study period had any significant effect on model error. Errors in the HIP‐Nmann model were of a similar magnitude to the HIP‐Dlet model. Errors in the HIP‐Dlet model resulted predominantly from errors in the measured soil temperatures. Errors in the HIP‐Nmann were due to errors in the measured soil temperatures and the inaccurate simulation of the surface boundary condition. The development of future peatland temperature models should, therefore, focus on the simulation of the surface boundary condition, particularly the parameterisation of the surface resistance that is shown here to produce significant errors in the modelled soil temperatures.