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冰川冻土  2013 

天山冰缘环境活动层冻融过程定位观测研究

DOI: 10.7522/j.issn.1000-0240.2013.0033, PP. 272-279

Keywords: 天山,石环,冻融作用,气候变化

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Abstract:

冻融作用是冰缘环境的一个重要地貌过程,其活动性直接反映气候变化,成为冰冻圈过程研究的重要内容.依据天山乌鲁木齐河源1991-2011年石环长期定位观测资料,对天山大陆性冰缘环境中石环发育特点和冻融作用机制进行深入探讨.结果表明乌鲁木齐河源区石环冻胀作用在地表20cm内最强,直径为3cm的定位桩受到的冻胀作用最小,石环从中心向边缘冻胀作用变弱;对比石环发育和无石环的地表,前者冻融作用更强;海拔对冻胀作用有明显影响,在布设观测点的海拔3500~4000m范围内,随海拔上升,冻胀作用增强,到海拔3900m达到最大,显示与当地现代冰川平衡线高度的吻合性.相关性分析表明,气候因素中夏季水热条件对石环发育作用较大,其中夏季降水对冻胀作用的影响显著,一年中地温在0℃波动的天数也是重要的影响因素;石环活动层定位观测揭示出冰缘地貌对区域气候变化反应敏感,对近20a温度升高有积极响应.

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