Estimation of Permafrost Ground Ice to 10 m Depth on the Qinghai‐Tibet Plateau

Permafrost and Periglacial Processes, Journal Year: 2024, Volume and Issue: 35(3), P. 423 - 434

Published: March 21, 2024

ABSTRACT Permafrost ground ice melting could alter hydrological processes in cold regions by releasing water. Currently, there is a lack of gridded data from the Qinghai‐Tibet Plateau (QTP). Using 664 borehole sample records, we applied random forest (RF) method to predict content permafrost between 2 and 10 m depth three layers (2–3, 3–5, 5–10 m) at spatial resolution 1 km. The RF predictions demonstrated an R value exceeding 0.80 for all with negligible positive overestimation (0.98%–1.85%). first layer (2–3 can be predicted primarily using climate variables, but contribution terrain soil variables increases as increases. total water storage across QTP (2–10 depth) approximately 3330.0 km 3 , 403.5 2–3 layer, 857.2 3–5 2069.3 layer. This study generated time dataset shallow entire which used improve simulations regions.

Language: Английский

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Permafrost carbon cycle and its dynamics on the Tibetan Plateau

Science China Life Sciences, Journal Year: 2024, Volume and Issue: 67(9), P. 1833 - 1848

Published: June 26, 2024

Language: Английский

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Accelerated permafrost degradation in thermokarst landforms in Qilian Mountains from 2007 to 2020 observed by SBAS-InSAR

Ecological Indicators, Journal Year: 2024, Volume and Issue: 159, P. 111724 - 111724

Published: Feb. 1, 2024

Due to the effects of global climate change, permafrost temperature in Qinghai-Tibet Plateau (QTP) has rapidly increased over past decades. The development thermokarst landforms is one distinctive indicator degradation, while change rate degradation recent 10 years not been systematically investigated QTP. In this paper, annual average growth (AAGR) ground deformation, thaw slump areas, and active layer thickness (ALT) are monitored integrating SAR (synthetic aperture radar) optical images for 2007 2020 Qilian Mountain, northern deformation seasonal amplitude were estimated by InSAR method, descending ascending data compared validate results. Based on results, AAGR was introduced evaluate degree. Moreover, ALT based Stefan model. spatio-temporal characteristics its relationship with explored. Experimental results show that about 150 % from 2017–20. maximum study area can reach 20.6 %. an obvious trend expansion 2009 2015, distribution agreed well map. ranged 0.5 m 2.8 m, indicating increase 2020. area, ALT, it inferred frozen undergoing serious last years. This demonstrates capability multi-temporal observing accelerated thaw-freezing process monitoring parameters.

Language: Английский

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Channel Morphological Characteristics and Morphodynamic Processes of Large Braided Rivers in Response to Climate‐Driven Water and Sediment Flux Change in the Qinghai‐Tibet Plateau

Water Resources Research, Journal Year: 2024, Volume and Issue: 60(9)

Published: Aug. 28, 2024

Abstract With rising air temperature and precipitation, water sediment fluxes in the Source Region of Yangtze River (SRYR) have increased since 2000s. Nonetheless, response braided river morphology to climate‐driven flux change is still unknown. Water bodies 9 large rivers from 1990 2020 were extracted based on Google Earth Engine platform, impacts climate morphological indices morphodynamic processes quantified. A new segmentation method presented more precisely extract body when branch width less than an image pixel size. The warming wetting trend led vegetation cover increase. increase flux, area each reach has both flood non‐flood season. 3–5 years mean annual erosion accretion intensity (newly proposed this study) channel shows three different trends increasing, weakening, unchanged over time. These can be classified into patterns climate‐change driven SRYR as follows: constrained pattern (weakening or unchanged), dominated (increasing), (increasing unchanged). In summary, showing consistent increasing area, general expansion active channel, for some rivers, with flux.

Language: Английский

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Permafrost on the Tibetan Plateau is degrading: Historical and projected trends

Journal of Hydrology, Journal Year: 2023, Volume and Issue: 628, P. 130501 - 130501

Published: Nov. 21, 2023

Language: Английский

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Advancing streamflow prediction in data-scarce regions through vegetation-constrained distributed hybrid ecohydrological models

Journal of Hydrology, Journal Year: 2024, Volume and Issue: 645, P. 132165 - 132165

Published: Oct. 19, 2024

Language: Английский

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Accelerated Permafrost Thaw Linked to Rising River Temperature and Widening Channels

Geophysical Research Letters, Journal Year: 2025, Volume and Issue: 52(1)

Published: Jan. 5, 2025

Abstract River‐controlled permafrost dynamics are crucial for sediment transport, infrastructure stability, and carbon cycle, yet not well understood under climate change. Leveraging remotely sensed datasets, in‐situ hydrological observations, physics‐based models, we reveal overall warming widening rivers across the Tibetan Plateau in recent decades, driving accelerated sub‐river thaw. River temperature of a representative section (Tuotuohe River) on central Plateau, has increased notably (0.39°C/decade) from 1985 to 2017, facilitating heat transfer into underlying via both convection conduction. Consequently, beneath warms faster (0.37°C–0.66°C/decade) ∼0.5 m thicker active layer than non‐inundated (0.17°C–0.49°C/decade). With increasing river discharge, inundated area expands laterally along riverbed (16.4 m/decade), further accelerating thaw previously bars. Under future warmer wetter climate, anticipated intensification degradation will pose risks riverine amplify release.

Language: Английский

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Rapid degradation of frozen soil environments in thermokarst-affected alpine grasslands on the Qinghai-Tibet Plateau under climate change

CATENA, Journal Year: 2025, Volume and Issue: 254, P. 108936 - 108936

Published: March 19, 2025

Language: Английский

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Hydrological Changes Caused by Integrated Warming, Wetting, and Greening in Permafrost Regions of the Qinghai‐Tibetan Plateau

Water Resources Research, Journal Year: 2025, Volume and Issue: 61(4)

Published: April 1, 2025

Abstract The Qinghai‐Tibetan Plateau (QTP) has undergone significant warming, wetting, and greening (WWG) over decades, alongside substantial alterations in hydrological regimes. These changes present great challenges for safeguarding water resources ecosystems downstream. However, the lack of field observation systematic research obscured our understanding how processes respond to combined influences climate‐permafrost‐vegetation. This study focuses on source regions Yangtze River, one highest permafrost‐covered basins QTP, employs a process‐based model quantify effects WWG processes. We show that increasing precipitation dominates subsurface runoff while rising temperature primarily affects surface by reducing frozen duration (−52 days/century) thickening active layer (+2.4 cm/year). Greening vegetation transpiration interception evaporation. Warming, will cause transition dynamics from dominance permafrost basins, reduce risk both flooding shortage indicated decreased maximum low flow high 11.0 5.0 days/year, respectively. Moreover, cold exhibit greater propensity generating runoff, as higher annual increase coefficient (0.005/year) total (4.81 mm/year), compared warm (with 0.001/year 1.20 mm/year, respectively). findings enhance due provide insights management under climate change.

Language: Английский

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Potential vegetation greenness changes in the permafrost areas over the Tibetan Plateau under future climate warming

Global and Planetary Change, Journal Year: 2025, Volume and Issue: unknown, P. 104833 - 104833

Published: April 1, 2025

Language: Английский

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