青藏高原多年冻土区地温年变化深度的变化规律及影响因素

doi:10.7522/j.issn.1000-0240.2016.0139

冰川冻土 ›› 2016, Vol. 38 ›› Issue (5): 1189-1200.doi: 10.7522/j.issn.1000-0240.2016.0139

• 冰冻圈与全球变化 • 下一篇

青藏高原多年冻土区地温年变化深度的变化规律及影响因素

刘广岳, 赵林, 谢昌卫, 庞强强, 杜二计, 乔永平

中国科学院寒区旱区环境与工程研究所冰冻圈科学国家重点实验室青藏高原冰冻圈观测研究站, 甘肃兰州 730000

收稿日期:2016-04-15 修回日期:2016-08-20 出版日期:2016-10-25 发布日期:2017-01-22
作者简介:刘广岳(1984-),男,河北衡水人,工程师,2009年在中国科学院寒区旱区环境与工程研究所获硕士学位,现主要从事冻土变化监测与研究工作.E-mail:liuguangyue@lzb.ac.cn.
基金资助:
国家自然科学基金青年科学基金（41401086）；国家重大科学研究计划“冰冻圈变化及其影响研究”中“冻土水热过程及其对气候的响应”课题（2013CBA01803）；国家自然科学基金委员会创新研究群体科学基金（41421061）；冰冻圈科学国家重点实验室自主课题（SKLCS-ZZ-2016）资助

Variation characteristics and impact factors of the depth of zero annual amplitude of ground temperature in permafrost regions on the Tibetan Plateau

LIU Guangyue, ZHAO Lin, XIE Changwei, PANG Qiangqiang, Du Erji, QIAO Yongping

State Key Laboratory of Cryospheric Sciences/Cryosphere Research Station on Qinghai-Xizang Plateau, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China

Received:2016-04-15 Revised:2016-08-20 Online:2016-10-25 Published:2017-01-22

摘要/Abstract

摘要：

地温年变化深度的准确判断对于多年冻土发育特征评估、寒区冻土模式下边界深度的确定具有重要意义.通过对青藏高原地区典型钻孔地温数据进行分析，初步揭示了多年冻土地温年变化深度的变化规律及其影响因素，并提出一种简化了地表和活动层状态影响的地温年变化深度估算方法.结果表明：研究区低温冻土的地温年变化深度平均值比高温冻土大4.6 m，随着冻土温度升高，地温年变化深度基本上呈减小趋势，部分低温冻土钻孔由于土层含水率过高导致地温年变化深度相对较小；由于活动层水热动态和冻融过程的影响，地温年变化深度与浅层（0.5 m）温度年较差相关性不显著，而与多年冻土上限附近温度年较差的大小呈显著正相关关系；地层介质的热扩散率差异是导致地温年变化深度区域差异和变化的主要原因，土层含水率、温度、质地以及水的相态是影响地层热物理性质重要因素.

关键词: 多年冻土, 地温年变化深度, 年平均地温, 青藏高原

Abstract:

The accurate judgment on the depth of zero annual amplitude (ZAA) of ground temperature has significant implications for estimating permafrost evolution and determining the lower-boundary depth used in climate models, land surface models or hydrological models. Based on the analysis of ground temperatures observed in 15 typical monitoring boreholes on the Tibetan Plateau, the primary variation characteristics and impact factors on the depth of ZAA are revealed and a simplified method for calculating the depth of ZAA is put forward. The results showed that the average ZAA of low-temperature permafrost is 4.6 m more than the average one of high-temperature permafrost; the ZAA decreases with the increase of permafrost temperature, but there are several boreholes with high soil moisture content bored in low-temperature permafrost regions being having relatively smaller ZAAs. Due to the effect of dynamic of heat and water and freezing and thawing process occurred in the active layer, ground temperature changing depth has no significant correlation with annual ground temperature variation in the shallow layer (0.5 m in depth), but has significant positive correlation with temperature annual range near the permafrost table. The differences of thermo-physical parameters among boreholes at different regions are the main cause of significant regional difference and variation of ZAA; the ground water content, temperature, texture and water phase state play important roles in the variation of the thermo-physical parameters of geological media. Annual variation depth of ground temperature has no significant correlation with the shallow ground temperature changes (less than 0.5 m in depth), but has significantly positive correlation with annual temperature range near the permafrost table; the differences in thermal diffusivity of stratum medium are the main reason for annual ground temperature changing depth with regional difference; the change in soil moisture content, temperature, texture and phase state of water is an important factor affecting thermo-physical properties.

Key words: permafrost, depth of zero annual amplitude (ZAA) of ground temperature, mean annual ground temperature, Tibetan Plateau

中图分类号:

P642.14

刘广岳, 赵林, 谢昌卫, 庞强强, 杜二计, 乔永平. 青藏高原多年冻土区地温年变化深度的变化规律及影响因素[J]. 冰川冻土, 2016, 38(5): 1189-1200.

LIU Guangyue, ZHAO Lin, XIE Changwei, PANG Qiangqiang, Du Erji, QIAO Yongping. Variation characteristics and impact factors of the depth of zero annual amplitude of ground temperature in permafrost regions on the Tibetan Plateau[J]. JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY, 2016, 38(5): 1189-1200.

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青藏高原多年冻土区地温年变化深度的变化规律及影响因素

Variation characteristics and impact factors of the depth of zero annual amplitude of ground temperature in permafrost regions on the Tibetan Plateau

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