Precipitation plays an important role in permafrost hydrology; it can alter the hydrothermal condition of the active layer and even influence the permafrost aggradation or degradation. Moisture recycling from evaporation and transpiration can greatly contribute to local precipitation in some regions. This study selected four monitoring sites and used an isotope mixing model to investigate local moisture recycling in permafrost regions of the central Qinghai‐Tibet Plateau (QTP). The results showed that the local water vapour flux in the summer and autumn were dominantly influenced by westerlies and the Indian monsoon. Moistures for precipitation in Wudaoliang (WDL) and Fenghuoshan (FHS) mainly came from the western QTP, eastern Tianshan Mountains, western Qilian Mountains, and the surrounding regions. In comparsion, more than half of precipitation at Tanggula (TGL) was mostly sourced from the Indian monsoon. Local moisture recycling ratios at the four sites ranged from 14% ± 3.8% to 31.6% ± 4.8%, and depended on the soil moisture and relative humidity. In particular, the higher soil moisture and relative humidity promoted local moisture recycling, but frozen ground might be a potential influencing factor as well. The moisture recycling ratios of the study area were consistent with the results from both the Qinghai Lake Basin and the Nam Co Basin, but differed from those of the northwestern QTP. This difference may indirectly confirm the great spatial variability in precipitation on the QTP. Moreover, the rising air temperature and ground temperature, increasing precipitation, higher soil moisture, higher vegetation cover, and expanding lakes in the study area may be conductive to enhancing future local moisture recycling by altering ground surface conditions and facilitating the land surface evaporation and plant transpiration.

中文翻译：

---

在青藏高原中部多年冻土区，远距离大气水分占主导地位

降水在多年冻土水文学中起着重要作用。它可以改变活性层的水热条件，甚至影响多年冻土的凝结或降解。蒸发和蒸腾作用中的水分再循环可以极大地促进某些地区的局部降水。这项研究选择了四个监测点，并使用同位素混合模型调查了青藏高原中部多年冻土区的局部水分再循环。结果表明，夏季和秋季的局部水汽通量主要受西风和印度季风的影响。五道梁（WDL）和风火山（FHS）的降水主要来自西部QTP，东部天山，西部祁连山及周边地区。相比之下，唐古拉（TGL）的一半以上降水主要来自印度季风。这四个地点的局部水分循环利用率在14％±3.8％至31.6％±4.8％之间，取决于土壤湿度和相对湿度。特别是较高的土壤湿度和相对湿度促进了局部水分的循环利用，但结冰的地面也可能是潜在的影响因素。研究区的水分回收率与青海湖流域和纳木错流域的结果均一致，但与西北QTP的结果不同。这种差异可能间接证实了QTP上降水的巨大空间变异性。此外，气温和地温上升，降水增加，土壤湿度增加，植被覆盖率增加，