https://scholars.lib.ntu.edu.tw/handle/123456789/634804
標題: | Stochastic representation of spatial variability in thaw depth in permafrost boreal forests | 作者: | TARO NAKAI Hiyama, Tetsuya Kotani, Ayumi Iijima, Yoshihiro Ohta, Takeshi Maximov, Trofim C. |
關鍵字: | gamma distribution | permafrost boreal forest | spatial variability | thaw depth | 公開日期: | 1-一月-2023 | 來源出版物: | Permafrost and Periglacial Processes | 摘要: | 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. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/634804 | ISSN: | 10456740 | DOI: | 10.1002/ppp.2204 |
顯示於: | 森林環境暨資源學系 |
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