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| DOI | 10.1007/s00704-024-04882-1 |
| Parameterization model of soil thermal conductivity and its application in the permafrost region of the Qinghai-Tibet Plateau | |
| 发表日期 | 2024 |
| ISSN | 0177-798X |
| EISSN | 1434-4483 |
| 英文摘要 | Soil thermal conductivity (STC), which describes the ability of soil to transfer heat, is critical to understanding the thermal regime. Simulations of the heat of the permafrost regions on the Qinghai-Tibet Plateau (QTP) are currently inaccurate. This is partly because the current STC models used in the land surface models are not adequate to accurately reflect the characteristics of the ice-water phase change. Here, the new STC model was developed by dividing three different stages. Our analyses revealed that the soil moisture (theta(w)) undergoes a rapid phase change in the-2.5 0 degree celsius, where minor temperature changes could cause larger theta w changes. When the temperature is below-2.5 degree celsius, the theta(w) mostly remains stable. Considering the influence of various factors in different temperature ranges, an improved STC model was proposed by piecewise fitting at 0 degree celsius and-2.5 degree celsius for the depths of 10-50 cm. Independent test results showed that the new model significantly improved simulation accuracy of STC in permafrost regions and was better able to reflect it changing characteristics, especially in the 50 cm depth. Lastly, the daily STC product in the permafrost region of the QTP was estimated with the new model. The average STC during 1982 to 2020 was about 0.495 Wm(-1)K(-1), showing a spatial pattern of low in the northwest and high in the southeast. In addition, the STC showed a tiny increasing trend at a rate of 0.008 Wm(-1)K(-1)/10a. Spatially, the regions with the highest rates of increase were concentrated in the eastern, southeastern, and south-western regions, which comprise mostly unstable and extremely unstable permafrost. This study deepened our understanding of the STC during the freeze- thaw cycle and provides data products for further studies on the soil thermal state in permafrost regions. |
| 语种 | 英语 |
| WOS研究方向 | Meteorology & Atmospheric Sciences |
| WOS类目 | Meteorology & Atmospheric Sciences |
| WOS记录号 | WOS:001171584400001 |
| 来源期刊 | THEORETICAL AND APPLIED CLIMATOLOGY
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| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/289967 |
| 作者单位 | Zaozhuang University; Chinese Academy of Sciences; Southern Marine Science & Engineering Guangdong Laboratory; Southern Marine Science & Engineering Guangdong Laboratory (Guangzhou); Nanjing Xiaozhuang University |
| 推荐引用方式 GB/T 7714 | . Parameterization model of soil thermal conductivity and its application in the permafrost region of the Qinghai-Tibet Plateau[J],2024. |
| APA | (2024).Parameterization model of soil thermal conductivity and its application in the permafrost region of the Qinghai-Tibet Plateau.THEORETICAL AND APPLIED CLIMATOLOGY. |
| MLA | "Parameterization model of soil thermal conductivity and its application in the permafrost region of the Qinghai-Tibet Plateau".THEORETICAL AND APPLIED CLIMATOLOGY (2024). |
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