- Book学术

发布求助

文献互助智能选刊最新文献

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology Pub Date : 2025-09-26 DOI:10.1016/j.coldregions.2025.104704

Nuocheng Li , Zhanju Lin , Xingwen Fan , Yanhe Wang , Wenjiao Li , Qiang Gu , Wenlong Pang , Xuhui Wang , Peng Zhang

{"title":"Study on the ground-air temperature relationship under microenvironmental differences in the warm permafrost region of the Tibetan Plateau","authors":"Nuocheng Li , Zhanju Lin , Xingwen Fan , Yanhe Wang , Wenjiao Li , Qiang Gu , Wenlong Pang , Xuhui Wang , Peng Zhang","doi":"10.1016/j.coldregions.2025.104704","DOIUrl":null,"url":null,"abstract":"<div><div>In permafrost regions, the ground-air temperature serves as a crucial boundary condition for simulating the spatial distribution and predicting the changing trends of permafrost, as well as a primary parameter for assessing the surface energy budget in alpine regions. However, current research on the ground-air temperature relationship at the local scale remains insufficient, particularly in the context of the complex surface conditions of the Tibetan Plateau. This study observed and analyzed nearly seven years of air and ground surface temperature from eight sites with different microenvironments in the warm permafrost region of the Tibetan Plateau hinterland, investigating the quantitative impact of microenvironmental differences on the ground-air temperature relationship at the local scale. Results indicated that while the mean annual air temperature was relatively uniform, the ground surface temperature (5 cm depth) varied markedly, driven by shallow soil moisture, vegetation cover, and slope aspect. Sites with greater shallow soil moisture, higher vegetation cover, or north-facing (shady) slopes exhibited larger thermal offsets and longer lag times, particularly in the cold season. The ground-air temperature relationship at all eight sites was linear (R2 > 0.90), with the slope (k) and intercept (b) values exhibiting significant spatial and temporal heterogeneity. Specifically, the k value decreased with increasing vegetation cover, being the smallest in alpine grassland (k = 0.76) and the largest in sunny slope (k = 0.97); the b value increased with increasing shallow soil moisture, and sunny slopes significantly promoted an increase in b value, being the smallest in shady slope (b = 1.18) and the largest in swamp meadow (b = 3.87). These microenvironmental differences further influenced permafrost stability, with high shallow soil moisture and dense vegetation (>30 % cover) reducing stability, while north-facing slopes provided more favorable thermal conditions. These findings have important implications for optimizing boundary conditions in permafrost model simulations.</div></div>","PeriodicalId":10522,"journal":{"name":"Cold Regions Science and Technology","volume":"241 ","pages":"Article 104704"},"PeriodicalIF":3.8000,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Cold Regions Science and Technology","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0165232X25002873","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CIVIL","Score":null,"Total":0}

引用次数: 0

摘要

在多年冻土区，地气温度是模拟多年冻土空间分布和预测其变化趋势的重要边界条件，也是评估高寒地区地表能量收支的主要参数。结果表明，虽然年平均气温相对均匀，但地表温度（5 cm深度）受浅层土壤湿度、植被覆盖和坡向的影响变化明显。浅层土壤湿度较大、植被覆盖度较高或朝北（背阴）斜坡的地点表现出较大的热补偿和较长的滞后时间，特别是在寒冷季节。8个站点的地气温度关系均为线性关系（R2 > 0.90），且斜率(k)和截距(b)值表现出显著的时空异质性。其中，k值随植被覆盖度的增加而减小，高寒草地最小（k = 0.76），阳坡最大（k = 0.97）；b值随浅层土壤水分的增加而增加，阳坡显著促进了b值的增加，其中阴坡最小（b = 1.18），沼泽草甸最大（b = 3.87）。这些微环境差异进一步影响了多年冻土的稳定性，较高的浅层土壤湿度和茂密的植被（30%的覆盖度）降低了稳定性，而朝北的斜坡提供了更有利的热条件。这些发现对优化多年冻土模型模拟的边界条件具有重要意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

查看原文本刊更多论文

Study on the ground-air temperature relationship under microenvironmental differences in the warm permafrost region of the Tibetan Plateau

In permafrost regions, the ground-air temperature serves as a crucial boundary condition for simulating the spatial distribution and predicting the changing trends of permafrost, as well as a primary parameter for assessing the surface energy budget in alpine regions. However, current research on the ground-air temperature relationship at the local scale remains insufficient, particularly in the context of the complex surface conditions of the Tibetan Plateau. This study observed and analyzed nearly seven years of air and ground surface temperature from eight sites with different microenvironments in the warm permafrost region of the Tibetan Plateau hinterland, investigating the quantitative impact of microenvironmental differences on the ground-air temperature relationship at the local scale. Results indicated that while the mean annual air temperature was relatively uniform, the ground surface temperature (5 cm depth) varied markedly, driven by shallow soil moisture, vegetation cover, and slope aspect. Sites with greater shallow soil moisture, higher vegetation cover, or north-facing (shady) slopes exhibited larger thermal offsets and longer lag times, particularly in the cold season. The ground-air temperature relationship at all eight sites was linear (R² > 0.90), with the slope (k) and intercept (b) values exhibiting significant spatial and temporal heterogeneity. Specifically, the k value decreased with increasing vegetation cover, being the smallest in alpine grassland (k = 0.76) and the largest in sunny slope (k = 0.97); the b value increased with increasing shallow soil moisture, and sunny slopes significantly promoted an increase in b value, being the smallest in shady slope (b = 1.18) and the largest in swamp meadow (b = 3.87). These microenvironmental differences further influenced permafrost stability, with high shallow soil moisture and dense vegetation (>30 % cover) reducing stability, while north-facing slopes provided more favorable thermal conditions. These findings have important implications for optimizing boundary conditions in permafrost model simulations.

求助全文

通过发布文献求助，成功后即可免费获取论文全文。去求助

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.