Stochastic representation of spatial variability in thaw depth in permafrost boreal forests

IF 3 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL
T. Nakai, T. Hiyama, A. Kotani, Y. Iijima, T. Ohta, T. Maximov
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引用次数: 0

Abstract

A simple stochastic representation of the spatial variability in thaw depth is proposed. Thaw depth distribution measured in the two larch‐type forests in eastern Siberia, Spasskaya Pad and Elgeeii, showed different spatial, seasonal, and interannual variability, respectively. Year‐to‐year variation in active‐layer thickness was minor in Spasskaya Pad compared to Elgeeii. A gamma distribution adequately represented both sites' thaw depth spatial variability as the cumulative probability. Thus, we developed a simple model using the gamma distribution that illustrates the spatial variability in thaw depth at any thawing stage as a function of a given mean thaw depth. A hierarchy of models was introduced that sequentially considered the constant state, linearity, and nonlinearity in the dependence of the rate parameter of the gamma distribution on the mean thaw depth. Although the requirements of the model levels differed between Spasskaya Pad and Elgeeii, the proposed model successfully represented the spatial variability in thaw depth at both sites during different thaw seasons.
多年冻土北方森林融深空间变异性的随机表示
提出了解冻深度空间变异性的简单随机表示。在西伯利亚东部的两个落叶松型森林Spasskaya Pad和Elgeeii中测量的解冻深度分布分别显示出不同的空间、季节和年际变化。与Elgeeii相比,Spasskaya井场活性层厚度的逐年变化较小。伽马分布充分地将两个地点的解冻深度空间变异性表示为累积概率。因此,我们使用伽马分布开发了一个简单的模型,该模型说明了任何解冻阶段解冻深度的空间变异性,作为给定平均解冻深度的函数。引入了一系列模型,依次考虑了伽马分布的速率参数对平均解冻深度的依赖性中的恒定状态、线性和非线性。尽管Spasskaya Pad和Elgeeii对模型水平的要求不同,但所提出的模型成功地代表了不同解冻季节两个地点解冻深度的空间变化。
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来源期刊
CiteScore
9.70
自引率
8.00%
发文量
43
审稿时长
>12 weeks
期刊介绍: Permafrost and Periglacial Processes is an international journal dedicated to the rapid publication of scientific and technical papers concerned with earth surface cryogenic processes, landforms and sediments present in a variety of (Sub) Arctic, Antarctic and High Mountain environments. It provides an efficient vehicle of communication amongst those with an interest in the cold, non-glacial geosciences. The focus is on (1) original research based on geomorphological, hydrological, sedimentological, geotechnical and engineering aspects of these areas and (2) original research carried out upon relict features where the objective has been to reconstruct the nature of the processes and/or palaeoenvironments which gave rise to these features, as opposed to purely stratigraphical considerations. The journal also publishes short communications, reviews, discussions and book reviews. The high scientific standard, interdisciplinary character and worldwide representation of PPP are maintained by regional editorial support and a rigorous refereeing system.
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