Role of permafrost degradation on evapotranspiration on the Qinghai-Tibet Plateau 青藏高原多年冻土退化对蒸散发的影响

Ji，Fang1,2; Fan，Linfeng2; Kuang，Xingxing2; Zou，Yiguang2; Zheng，Chunmiao2,3

2022-05-01

10.14042/j.cnki.32.1309.2022.03.004

水科学进展   Impact Factor & Quartile

1001-6791

The Qinghai-Tibet Plateau (QTP), known as the "Asian Water Tower", is extremely sensitive to climate change. Studying the impacts of permafrost degradation on evapotranspiration is conducive to improving the understanding of the response of hydrological processes and water balance to climate change in the QTP. Based on the Budyko-Fu hypothesis, a coupled hydrothermal model was constructed to account for the active layer deepening of the permafrost regions with a model parameterization scheme suitable for the QTP. The results show that the annual average evapotranspiration in the permafrost regions on the QTP is 275.6 mm during 1982—2018 and shows a descending gradient from southeast to northwest. The overall evapotranspiration in the permafrost areas on the QTP increased significantly at a rate of 3.57 mm/a (p < 0.05). Deepening of the active layer causes increased evapotranspiration while ignoring the permafrost degradation would result in an underestimation of evapotranspiration by about 2.2%. The effects of permafrost degradation on evapotranspiration exhibit a significant spatial heterogeneity. The lower the soil available water capacity and vegetation coverage are, the more sensitive the responses of evapotranspiration to permafrost degradation become.

active layer Budyko-Fu hypothesis climate change evapotranspiration permafrost degradation Qinghai-Tibet Plateau

Chinese

Corresponding

National Natural Science Foundation of China[92047202];

2-s2.0-85138617026

Scopus

1.School of Environment,Harbin Institute of Technology,Harbin,150090,China
2.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.EIT Institute for Advanced Study,Ningbo,315200,China

Ji，Fang,Fan，Linfeng,Kuang，Xingxing,等. Role of permafrost degradation on evapotranspiration on the Qinghai-Tibet Plateau 青藏高原多年冻土退化对蒸散发的影响[J]. 水科学进展,2022,33(3):390-400.

Ji，Fang,Fan，Linfeng,Kuang，Xingxing,Zou，Yiguang,&Zheng，Chunmiao.(2022).Role of permafrost degradation on evapotranspiration on the Qinghai-Tibet Plateau 青藏高原多年冻土退化对蒸散发的影响.水科学进展,33(3),390-400.

Ji，Fang,et al."Role of permafrost degradation on evapotranspiration on the Qinghai-Tibet Plateau 青藏高原多年冻土退化对蒸散发的影响".水科学进展 33.3(2022):390-400.