Analysis of Permafrost Distribution and Change in the Mid-East Qinghai–Tibetan Plateau during 2012–2021 Using the New TLZ Model DOI Creative Commons
Zhijian Zhao, Hideyuki Tonooka

Remote Sensing, Journal Year: 2022, Volume and Issue: 14(24), P. 6350 - 6350

Published: Dec. 15, 2022

The monitoring of permafrost is important for assessing the effects global environmental changes and maintaining managing social infrastructure, remote sensing increasingly being used this wide-area monitoring. However, accuracy conventional method in terms temperature factor soil needs to be improved. To address these two issues, study, we propose a new model evaluate with higher than methods. In model, land surface (LST) as upper active layer permafrost, at top (TTOP) lower temperature. TTOP value then calculated by modified equation using precipitation–evapotranspiration (PE) factors account effect moisture. This referred TTOP-LST zero-curtain (TLZ) allows us analyze subsurface temperatures each layer, presence or absence through time series analysis stratified temperatures. was applied Qinghai–Tibetan Plateau classified into seven classes based on aspects such stability seasonality. As result, it possible map recent deterioration region, which thought caused warming. A comparison mean annual ground (MAGT) local data showed that average root square error (RMSE) different depths 0.19 degrees C, indicating validity TLZ model. similar expected enable detailed other areas.

Language: Английский

Water and heat coupling processes and its simulation in frozen soils: Current status and future research directions DOI
Guojie Hu, Lin Zhao, Ren Li

et al.

CATENA, Journal Year: 2022, Volume and Issue: 222, P. 106844 - 106844

Published: Dec. 21, 2022

Language: Английский

Citations

30
Vegetation greening amplifies shallow soil temperature warming on the Tibetan Plateau DOI Creative Commons
Ning Li, Lei Wang, Deliang Chen

et al.

npj Climate and Atmospheric Science, Journal Year: 2024, Volume and Issue: 7(1)

Published: June 4, 2024

Abstract Vegetation changes are expected to alter soil thermal regimes, consequently modifying climate feedbacks related frozen ground thawing and carbon cycling in cold regions. The Tibetan Plateau (TP) contains diverse alpine ecosystems the largest area of low–mid latitude Evidence suggests ongoing vegetation greening permafrost degradation during past several decades on TP. However, effect regimes TP is not well understood. Here, we quantify response shallow temperature change using remote–sensing data, in–situ observations, physics–based modelling. Our results show that over 20 years, was accompanied a notable decrease bare land by approximately 0.7% (5000 km 2 ). Annual mean showed significant warming trend 0.57 °C decade –1 ( p < 0.05) period 1983–2019, exceeding rate surface air temperature. Changes resulted annual 0.15 ± 0.33 across 2000–2019. varies with types: 0.24 0.48 permafrost, 0.18 0.36 seasonally ground, 0.11 0.32 unfrozen ground. net caused albedo increase radiation penetrating canopy, outweighing cooling limited evapotranspiration.

Language: Английский

Citations

8
An effective medium theory-based unified model for estimating thermal conductivity of unfrozen and frozen soils DOI
Hailong Ji, Fu Xue, Zhuotong Nan

et al.

CATENA, Journal Year: 2024, Volume and Issue: 239, P. 107942 - 107942

Published: March 13, 2024

Language: Английский

Citations

4
Active-layer processes DOI
N. I. Shiklomanov

Elsevier eBooks, Journal Year: 2024, Volume and Issue: unknown, P. 34 - 45

Published: April 30, 2024

Language: Английский

Citations

4
Accelerated Permafrost Thaw Linked to Rising River Temperature and Widening Channels DOI Creative Commons
Yi Zhao, Dongfeng Li

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

Citations

0
Decoding the Spatiotemporal Complexities of the Permafrost Carbon Feedback With Multimodal Ensemble Learning DOI Creative Commons
Bradley Gay, Neal J. Pastick, Jennifer D. Watts

et al.

Journal of Geophysical Research Machine Learning and Computation, Journal Year: 2025, Volume and Issue: 2(1)

Published: March 1, 2025

Abstract Complex nonlinear relationships exist between the permafrost thermal state, active layer thickness, and terrestrial carbon cycle dynamics. In Arctic boreal Alaska, significant uncertainties characterize spatiotemporal rate magnitude of degradation feedback, with increasing recognition importance thawing mechanisms. The challenges monitoring sub‐surface phenomena remote sensing technology further complicate issue. There is an urgent need to understand how what extent destabilizes balance in Alaska feedback involved. this research, we use our artificial intelligence‐driven model GeoCryoAI quantify dynamics Alaska. uses a hybridized process‐constrained ensemble learning framework simultaneously ingest, scale, analyze situ measurements, observations, process‐based modeling outputs disparate sampling data densities. We evaluated prior naïve (a) persistence (b) teacher forcing approaches relative (c) time‐delayed simulations, yielding following error metrics (RMSE) for thickness (ALT), methane (CH 4 ), dioxide (CO 2 respectively: 1.997, 1.327, 1.007 cm [1963–2022]; 0.884, 0.715, 0.694 nmol CH km −2 month −1 [1994–2022]; 1.906, 0.697, 0.213 µmol CO [1994–2022]. Our approach overcomes traditional inefficiencies resolves disparities. captures abrupt persistent changes while introducing novel methodology assimilating contemporaneous information at various scales. describe GeoCryoAI, methodology, results, plans future applications.

Language: Английский

Citations

0
Contrasting soil temperature regimes in peatlands of the discontinuous permafrost zone (Western Siberia) DOI Creative Commons
Tatiana V. Raudina, Sergey V. Loiko,

Georgyi I. Istigechev

et al.

Geoderma, Journal Year: 2025, Volume and Issue: 457, P. 117294 - 117294

Published: April 19, 2025

Language: Английский

Citations

0
Impacts of seasonally frozen soil hydrothermal dynamics on the watershed hydrological processes inferred from a spatially distributed numerical modelling approach DOI
Huiran Gao, Zhijie Zhang, Hao Chen

et al.

Journal of Hydrology, Journal Year: 2023, Volume and Issue: 624, P. 129947 - 129947

Published: July 19, 2023

Language: Английский

Citations

8
Divergent responses of permafrost degradation to precipitation increases at different seasons on the eastern Qinghai–Tibet Plateau based on modeling approach DOI Creative Commons
Jingjing Yang, Taihua Wang, Dawen Yang

et al.

Environmental Research Letters, Journal Year: 2023, Volume and Issue: 18(9), P. 094038 - 094038

Published: Aug. 15, 2023

Abstract The Qinghai–Tibet Plateau (QTP) has responded to remarkable climate warming with dramatic permafrost degradation over the past few decades. Previous studies have mostly focused on responses rising air temperature, while effects of accompanying increases in precipitation remain contentious and largely unknown. In this study, a distributed process-based model was applied quantify impacts increased thermal regimes by employing experiments source region Yellow River (SRYR) eastern QTP. results showed that active layer thickness (ALT) 0.25 m during 2010–2019 compared 2000 across SRYR, which primarily driven warming. contrast, annual played relatively limited role just slightly mitigated thickening 0.03 m. Intriguingly, cold warm seasons exerted opposite SRYR. season mainly promoted ALT increases, increases. ∼81.0% cooling wetting outweighed wetting; at transition zone where unstable degrading seasonally frozen ground, larger contributed degradation. This study explored physical mechanisms wetting, thus providing better understanding change warmer wetter

Language: Английский

Citations

8
Analysis of free and forced convections in the flow of radiative viscous fluid with oxytactic microorganisms DOI Creative Commons

S. Bilal,

Asad Ullah, Imtiaz Ali Shah

et al.

Frontiers in Materials, Journal Year: 2023, Volume and Issue: 10

Published: March 14, 2023

The prime intend behind the current effort is to explicate flow attributes of magnetically influenced Newtonian fluids toward a stretchable sheet under novel physical impact oxytactic microorganisms in comparative manner for free and forced convections. In addition, modified Fourier Fick’s laws are implemented examine change temperature concentration distributions more realistic by accounting thermal mass relaxation parameters flow. obtained PDEs reduced into non-linear ODEs employing similarity variables. Due complexity parametrically based differential equations, numerical scheme on finite-difference approach via MATLAB built-in routine known as BVP4C. Flow-controlling parameter effects associated evaluated through graphs tables. Subsequently, influence flow-controlling revealed pictures different convection regimes. Additionally, quantities such heat fluxes along with density motile also illustrated. From thorough analysis investigation, it inferred that velocity distribution enhances convections, whereas fluid diminishes against mentioned convective It manifested Nusselt number situation instead situation. magnitude skin friction factor case compared regime. reported uplifting magnitudes parameters, depreciation transfer rate arises. increment magnetic field, buoyancy ratio, bioconvection Rayleigh accelerate, while behavior quite opposite stretching ratio parameter.

Language: Английский

Citations

6