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| 基于MODIS温度的青藏高原多年冻土活动层厚度变化研究 | |
| 引用本文： | 龚婷婷,高冰,吉子晨,曹慧宇,张蕴灵.基于MODIS温度的青藏高原多年冻土活动层厚度变化研究[J].地理科学,2022,42(10):1848-1856. |
| 作者姓名： | 龚婷婷 高冰 吉子晨 曹慧宇 张蕴灵 |
| 作者单位： | 1.中国公路工程咨询集团有限公司，北京 100097 2.空间信息应用与防灾减灾技术交通运输行业研发中心，北京 100097 3.中咨数据有限公司，北京 100097 4.中国地质大学（北京）水资源与环境学院，北京 100083 |
| 基金项目： | 高分综合交通遥感应用示范系统（二期）(07-Y30B03-9001-19/21) |
| 摘 要： | 基于MODIS温度数据，采用TTOP模型和Stefan公式模拟了青藏高原地区的冻土分布并计算了活动层厚度，并与地面观测结果进行了对比。结果表明：2003—2019年青藏高原多年冻土面积为1.01×106 km2；多年冻土活动层厚度区域平均值为1.79 m， 活动层厚度区域平均的变化率为3.67 cm/10a，且草甸地区的变化率明显大于草原地区，5100~5300 m高程带的活动层厚度变化速率最大。 |
| 关 键 词： | 青藏高原 多年冻土 活动层厚度 MODIS数据 Stefan公式 |
| 收稿时间： | 2021-08-12 |
| 修稿时间： | 2022-01-01 |
Variation of Active Layer Thickness of Permafrost in the Qinghai-Tibetan Plateau Based on MODIS Temperature Product |
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| Gong Tingting,Gao Bing,Ji Zichen,Cao Huiyu,Zhang Yunling.Variation of Active Layer Thickness of Permafrost in the Qinghai-Tibetan Plateau Based on MODIS Temperature Product[J].Scientia Geographica Sinica,2022,42(10):1848-1856. | |
| Authors: | Gong Tingting Gao Bing Ji Zichen Cao Huiyu Zhang Yunling |
| Institution: | 1. China Highway Engineering Consultants Corporation, Beijing 100097, China 2. Research and Development Center of Transport Industry of Spatial Information Application and Disaster Prevention and Mitigation Technology, Beijing 100097, China 3. China Highway Engineering Consultanting Corporation Data Co., Ltd., Beijing 100097, China 4. School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China |
| Abstract: | The Qinghai-Tibetan Plateau is the major region covered by permafrost in the middle and low latitudes of the world. The change in permafrost has a significant impact on the hydrological processes and ecological environment on the Qinghai-Tibetan Plateau. In this study, the distribution of frozen soil and active layer thickness (ALT) of permafrost are simulated using the temperature at the top of permafrost (TTOP) model and the Stefan formula, which based on the moderate-resolution imaging spectroradiometer (MODIS) land surface temperature, and the results are compared with the ground observations. The results show that the estimated spatial distribution of permafrost is close to the map of permafrost proposed in previous studies. The ALT of permafrost estimated by MODIS land surface temperature data using Stefan formula has certain accuracies. However, there are some differences between the estimated ALT and observations in the region near the Qinghai-Tibet Highway possibly due to the human activities. The area of permafrost on the Qinghai-Tibetan Plateau is estimated to be about 1.01× 106 km2 in the period from 2003 to 2019; the regional averaged ALT on the Qinghai-Tibet Plateau is 1.79 m, and the change rate of ALT on the Qinghai-Tibet Plateau is estimated to be 3.67 cm/10a. The changes in the ALT show differences among different vegetation types. The change rate in meadow area is significantly higher than that in grassland area. The change rate also varies along different elevation intervals. From 4 100 m to 5 700 m, the change rate of ALT first increases and then decreases, and the change rate of ALT shows the largest value in the 5 100-5 300 m elevation intervals. The simulated frozen soil distribution and ALT in this study can provide valuable data support for the study of permafrost in the Qinghai-Tibetan Plateau and may deepen our understanding of the characteristics and changes in permafrost in the Qinghai-Tibetan Plateau. |
| Keywords: | Tibetan Plateau permafrost active layer thickness MODIS data Stefan formula |
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