Ground surface temperature and the detection of permafrost in the rugged topography on NE Qinghai-Tibet Plateau
Ground surface temperature and the detection of permafrost in the rugged topography on NE Qinghai-Tibet Plateau
复制标题
青藏高原东北部崎岖地形地表温度及多年冻土探测
DOI：
10.1016/j.geoderma.2018.07.011
复制
发表时间：
2019-01
期刊：
影响因子：
6.1
通讯作者：
Bense Victor F.
中科院分区：
文献类型：
--
作者：
Luo Dongliang;Jin Huijun;Bense Victor F.
青藏高原部分地区地形复杂，由于地理环境的特殊性和地球物理勘探的不便性，多年冻土的热状况一直是一个模糊的问题。而地表温度的监测相对容易实现，有利于冻土热状态的研究。本文以青藏高原东北部巴彦哈尔山区22个监测点为基础，研究了该地区地表冻融状况及其与冻土温度的关系。结果表明，与气温（Ta）主要受海拔高度控制不同，GST受海拔高度和地表特征（如植被、土壤质地和太阳辐射）的复杂影响。年平均气温变化范围为1.1 °C至−3.1 °C，平均气温为−0.8 °C。地表冻融过程取决于地形和局部地表特征。不稳定解冻、稳定解冻、不稳定冻结和稳定冻结的平均开始时间为2015年4月6日、2015年5月15日、2015年10月14日和2015年10月21日。根据MAGST与零年变幅深度地温的关系，GST可能是多年冻土热状态的可靠指标。对于22个站点，估计多年冻土的最低TZAA为-3.4 °C，最厚的多年冻土为106.2 m。然而，地下特性的详细调查是必不可少的永久冻土的准确推断。
The thermal regime of permafrost in the rugged topography on parts of the Qinghai-Tibet Plateau (QTP) remains ambiguous, due to general inaccessibility and inconvenient investigations with geophysical prospecting. While the relatively easy implementations of monitoring ground surface temperature (GST) may facilitate the investigations of permafrost thermal state. Here, surface freezing and thawing and the relationship betweenGSTand permafrost temperature are investigated in the Bayan Har Mountains, NE QTP on the basis of 22 monitoring sites. Results demonstrate that, unlike the air temperature (Ta) mainly controlled by elevation, theGSTis complicately influenced by elevation and the surface characteristics, such as vegetation, local soil textures, as well as the exposure to solar radiation. Mean annualGST(MAGST) ranges from 1.1 °C to −3.1 °C and is averaged at −0.8 °C.MAGSTgenerally decreases at a lapse rate of 1.1 °C/100 m in relation to elevation. Surface freezing and thawing processes depend on topography and local surface characteristics. The onset of unstable thawing, stable thawing, unstable freezing, and stable freezing are averaged at 6 April 2015, 15 May 2015, 14 October 2015, and 21 October 2015. Based on the relationship betweenMAGSTand the ground temperature at the depth of zero annual amplitude,GSTlikely serves as a reliable indicator of the thermal state of permafrost. For the 22 sites, it is estimated that the lowestTZAAof permafrost is −3.4 °C and the thickest permafrost is 106.2 m. However, detailed investigations of subsurface characteristics are indispensable for the accurate inference of permafrost.
登录
查看更多内容
青藏高原活动层厚度和多年冻土热状态的数值模拟
影响因子：
4.4
作者：
Qin Yanhui;Wu Tonghua;Zhao Lin;Wu Xiaodong;Li Ren;Xie Changwei;Pang Qiangqiang;Hu Guojie;Qiao Yongping;Zhao Guohui;Liu Guangyue;Zhu Xiaofan;Hao Junming
通讯作者：
Hao Junming
影响因子：
--
作者：
Lin Zhao;G. Cheng;Shuxun Li;Xinmin Zhao;Shao-yong Wang
通讯作者：
Lin Zhao;G. Cheng;Shuxun Li;Xinmin Zhao;Shao-yong Wang
影响因子：
25.2
作者：
Tingjun Zhang
通讯作者：
Tingjun Zhang
影响因子：
5
作者：
B. Staub;A. Hasler;J. Noetzli;R. Delaloye
通讯作者：
B. Staub;A. Hasler;J. Noetzli;R. Delaloye
影响因子：
6.7
作者：
Jin, Huijun;He, Ruixia;Chang, Xiaoli
通讯作者：
Chang, Xiaoli