Evaluation and analysis of root zone soil moisture products in the frozen soil of the western Daxinganling Mountains based on In-Situ data

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology Pub Date : 2025-09-19 DOI:10.1016/j.coldregions.2025.104694

Wei Shan , Xianju Yuan , Ying Guo , Chengcheng Zhang , Yan Wang , Lisha Qiu

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引用次数: 0

Abstract

As a major permafrost region in northeastern China, the western Daxinganling Mountains are characterized by extensive forest, agricultural, and pastoral resources. While the ecosystem exhibits high fragility, its substantial carbon sequestration capacity significantly contributes to global climate regulation. This study systematically evaluated root-zone soil moisture (RZSM) products—including SMAP-L4, ERA5-Land, GLDAS-2.1, and GLDAS-2.2—utilizing in situ ground station observations and multiple quantitative metrics. The objective was to quantify the accuracy of RZSM products in representing soil moisture, identify sources of error, and provide scientific support for their practical applications. The results show that, excluding seasonal frozen soil zones, RZSM products have limited capacity to capture phase transitions of soil moisture during freeze–thaw cycles, consistently showing wet biases. Notably, GLDAS-2.1 outperforms other products in regions with well-developed permafrost, whereas SMAP-L4 shows superior performance in areas with sparse permafrost coverage. Furthermore, RZSM products overestimate soil temperatures, leading to an extended thawing period of permafrost. This overestimation is particularly evident at sites GM01 and GM02, where pronounced discrepancies compared to field measurements are observed. In conclusion, the practical application of RZSM products in permafrost regions remains constrained, and their full scientific potential has yet to be harnessed.

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基于原位数据的大兴安岭西部冻土根区土壤水分产物评价与分析

大兴安岭西部是中国东北地区重要的多年冻土区，具有丰富的森林、农业和畜牧业资源。虽然生态系统表现出高度脆弱性，但其巨大的碳固存能力对全球气候调节有重要贡献。本研究利用地面站观测和多种定量指标，系统评价了根区土壤水分（RZSM）产品，包括SMAP-L4、ERA5-Land、GLDAS-2.1和gldas -2.2。目的是量化RZSM产品表征土壤湿度的准确性，识别误差来源，为其实际应用提供科学依据。结果表明，除季节性冻土带外，RZSM产品对冻融循环过程中土壤水分相变的捕捉能力有限，始终表现出湿润偏差。值得注意的是，GLDAS-2.1在多年冻土发育良好的地区表现优于其他产品，而SMAP-L4在多年冻土覆盖较少的地区表现优于其他产品。此外，RZSM产品高估了土壤温度，导致永久冻土融化期延长。这种高估在GM01和GM02站点尤其明显，与现场测量结果相比，在那里观察到明显的差异。综上所述，RZSM产品在多年冻土区的实际应用仍然受到限制，其全部科学潜力尚未得到充分利用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Cold Regions Science and Technology 工程技术-地球科学综合

CiteScore

7.40

自引率

12.20%

发文量

209

审稿时长

4.9 months

期刊介绍： Cold Regions Science and Technology is an international journal dealing with the science and technical problems of cold environments in both the polar regions and more temperate locations. It includes fundamental aspects of cryospheric sciences which have applications for cold regions problems as well as engineering topics which relate to the cryosphere. Emphasis is given to applied science with broad coverage of the physical and mechanical aspects of ice (including glaciers and sea ice), snow and snow avalanches, ice-water systems, ice-bonded soils and permafrost. Relevant aspects of Earth science, materials science, offshore and river ice engineering are also of primary interest. These include icing of ships and structures as well as trafficability in cold environments. Technological advances for cold regions in research, development, and engineering practice are relevant to the journal. Theoretical papers must include a detailed discussion of the potential application of the theory to address cold regions problems. The journal serves a wide range of specialists, providing a medium for interdisciplinary communication and a convenient source of reference.