In the mountainous permafrost area, most thaw slumps are distributed in north or northeast-facing shady slope areas. It is commonly known that there is a heterogeneity in permafrost between different slope aspects, but there has been a lack of detailed measured data to quantitatively evaluate their relationships, and in-depth understandings on how the slope aspects are linked to the distribution of thaw slumps. This study examined the heterogenous thermal regime, soil moisture content, and surface radiation at two slope sites with opposing aspects in a warming permafrost region on the Qinghai-Tibet Plateau (QTP). The results indicate that similar air temperatures (T_a) were monitored on the two slopes, but there were significant differences in ground temperature and moisture content in the active layer from 2016 to 2021. The sunny slope exhibited a higher mean annual ground surface temperature (T_s), and over the five years the mean annual temperature at the top of permafrost was 1.3–1.4℃ warmer on the sunny slope than the shady slope. On the contrary, the near-surface soil moisture content was about 10–13% lower on the sunny slope (~22–27%) than the shady slope (~35–38%) during the thawing season (June–September). Radiation data indicate that significantly higher shortwave downward radiation (DR) appeared at the sunny slope site. However, due to the greater surface albedo, the net radiation (R_n) was lower on the sunny slope. Slope aspect also affects the ground ice content due to its influence on ground temperature, freeze-thaw cycles, and soil moisture. Shady slopes have a shallower burial of ice-rich permafrost compared to sunny slopes. The results highlight greatly different near-surface ground thermal conditions at the two slope sites with different aspects in a mountainous permafrost region. This helps identify the slope-related causes of increasing thaw slumps and provides a basis for predicting their future development.

在山地多年冻土区，融雪塌陷多分布在北向或东北向的阴坡地区。众所周知，不同坡向之间的多年冻土存在异质性，但一直缺乏详细的测量数据来定量评估它们之间的关系，也缺乏对坡向与解冻塌陷分布之间关系的深入了解。 。这项研究研究了青藏高原（QTP）变暖的永久冻土区两个相反方向的斜坡地点的不均匀热状况、土壤湿度和表面辐射。结果表明，相似的气温 (T _a）在两个斜坡上都进行了监测，但2016年至2021年地温和活动层含水量存在显着差异。向阳坡表现出较高的年平均地表温度（T s ），并且在_五年内多年冻土顶部年平均气温阳坡比阴坡高1.3~1.4℃。相反，在解冻季节（6 月至 9 月），阳坡 (~22-27%) 的近地表土壤含水量比阴坡 (~35-38%) 低约 10-13%。辐射数据表明，向阳坡站点出现了明显较高的短波向下辐射（DR）。然而，由于地表反照率较大，净辐射（R _n）在向阳坡上较低。坡向也会影响地面冰含量，因为它会影响地面温度、冻融循环和土壤湿度。与阳光充足的斜坡相比，阴坡的富含冰的永久冻土埋藏较浅。研究结果突显了山地多年冻土区两个不同坡度地点近地表地面热条件的巨大差异。这有助于确定导致融雪滑落增加的与斜坡相关的原因，并为预测其未来发展提供基础。