Historical changes in the depth of seasonal freezing of “Xing’anling-Baikal” permafrost in China
Historical changes in the depth of seasonal freezing of “Xing’anling-Baikal” permafrost in China
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DOI：
10.1007/s10113-018-1407-6
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发表时间：
2018-09
影响因子：
4.2
通讯作者：
Zhongqiong Zhang;Mei-ting Hou;Qingbai Wu;Siru Gao
中科院分区：
文献类型：
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作者：
Zhongqiong Zhang;Mei-ting Hou;Qingbai Wu;Siru Gao
“兴安岭—贝加尔”多年冻土位于北半球多年冻土南缘，是多年冻土变化最重要的地区之一。基于近几十年来的月度气象资料和环极活动层监测资料，分析了我国兴安岭-贝加尔多年冻土的季节冰冻深度（DSF）和热力状况的变化，并与同纬度蒙古国多年冻土（LAT）的状况进行了比较。我国“兴安岭—贝加尔”多年冻土在该剖面上不相连。 DSF 在 0.78 和 3.25 m 之间变化。研究区DSF以土里河地区最厚,后减少至附近。变化率达到- 16.0–4.9 cm/a，大部分地区有所下降。地温以0~0.41℃/a的速度上升，而其他少数地区则以- 0.35℃/a的速度下降。冻结持续时间为 141-176 天。变化与当地气温、海拔、纬度、降水量有关。与同一纬度下蒙古国多年冻土状况相比，中国多年冻土退化速度更快。兴安岭地区多年冻土对气候变化的响应显着。研究结果将有助于了解当地多年冻土的时空变化，并为区域多年冻土提供相关验证。
“Xing’anling-Baikal” permafrost is located in the southern edge of the Northern Hemisphere permafrost, which is one of the most important regions of permafrost changes. Based on the monthly meteorological data and circumpolar active layer monitoring data in the last few decades, we analyzed the changes in the depth of seasonal freezing (DSF) and the thermal regime of Xing’anling-Baikal permafrost in China, and compared the state with that of the permafrost in Mongolia at the same latitude (LAT). The “Xing’anling-Baikal” permafrost in China was not connected in the section. The DSF changed between 0.78 and 3.25 m. In the study area, DSF was the thickest in Tulihe and reduced to around. The change rate reached − 16.0–4.9 cm/a and decreased in most areas. The ground temperature raised at a rate of 0–0.41 °C/a, whereas that of other few areas decreased with a rate of − 0.35 °C/a. Freezing duration spanned 141–176 days. The changes were related to air temperature, altitude, LAT, and precipitation in the local area. Compared with the state of permafrost in Mongolia at the same LAT, the permafrost in China exhibited a faster rate of degradation. The permafrost in the Xing’anling area significantly responded to climate change. The results will aid in understanding the temporal and spatial variation in local permafrost and provide relevant verification for regional permafrost.