Diurnal Soil Freeze‐Thaw Cycles and the Factors Determining Their Changes in Warming Climate in the Upper Brahmaputra Basin of the Tibetan Plateau DOI
Ning Li, Lan Cuo, Yongxin Zhang

et al.

Journal of Geophysical Research Atmospheres, Journal Year: 2024, Volume and Issue: 129(20)

Published: Oct. 22, 2024

Abstract Soil freeze‐thaw cycles play a critical role in ecosystem, hydrological and biogeochemical processes, climate. The Tibetan Plateau (TP) has the largest area of frozen soil that undergoes low‐mid latitudes. Evidence suggests ongoing changes seasonal during past several decades on TP. However, status diurnal (DFTC) shallow their response to climate change largely remain unknown. In this study, using in‐situ observations, latest reanalysis, machine learning, physics‐based modeling, we conducted comprehensive assessment spatiotemporal variations DFTC upper Brahmaputra (UB) basin. About 24 ± 8% basin is subjected with mean frequency 87 55 days 1980–2018. show small long‐term Air temperature impacts center mainly around freezing point (0°C). spatial air can primarily be explained by three factors: precipitation (30.4%), snow depth (22.6%) warming/cooling rates (14.9%). Both rainfall events reduce fluctuations temperature, subsequently reducing frequency, decreasing daytime through evaporation‐cooling albedo‐cooling effects, respectively. These results provide an in‐depth understanding its change.

Language: Английский

Extreme degradation of alpine wet meadow decelerates soil heat transfer by preserving soil organic matter on the Qinghai–Tibet Plateau DOI
Zeyong Gao, Chengming Zhang,

Wengyan Liu

et al.

Journal of Hydrology, Journal Year: 2025, Volume and Issue: unknown, P. 132748 - 132748

Published: Jan. 1, 2025

Language: Английский

Citations

5
Continentality determines warming or cooling impact of heavy rainfall events on permafrost DOI Creative Commons
Alexandra Hamm, Rúna Í. Magnússon, Ahmad Jan Khattak

et al.

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: June 16, 2023

Abstract Permafrost thaw can cause an intensification of climate change through the release carbon as greenhouse gases. While effect air temperature on permafrost is well quantified, rainfall highly variable and not understood. Here, we provide a literature review studies reporting effects ground temperatures in environments use numerical model to explore underlying physical mechanisms under different climatic conditions. Both evaluated body simulations indicate that continental climates are likely show warming subsoil hence increased end season active layer thickness, while maritime tend respond with slight cooling effect. This suggests dry regions warm summers prone more rapid degradation occurrences heavy events future, which potentially accelerate feedback.

Language: Английский

Citations

25
Links between seasonal suprapermafrost groundwater, the hydrothermal change of the active layer, and river runoff in alpine permafrost watersheds DOI Creative Commons
Jia Qin, Yongjian Ding,

Faxiang Shi

et al.

Hydrology and earth system sciences, Journal Year: 2024, Volume and Issue: 28(4), P. 973 - 987

Published: Feb. 27, 2024

Abstract. The seasonal dynamic of the suprapermafrost groundwater significantly affects runoff generation and confluence in permafrost basins is a leading issue that must urgently be addressed hydrological research cold alpine regions. In this study, process level (SGL), vertical gradient changes soil temperature (ST), moisture content active layer (AL), river were analyzed at four watersheds Qinghai–Tibet Plateau using comparative analysis nonlinear correlation evaluation method. impact freeze–thaw processes on SGL links between surface also investigated. year can divided into periods: (A) rapid falling period (October to mid-November), (B) stable low-water (late November May), (C) rising (approximately June), (D) high-water (July September), which synchronously respond variations AL. characteristics causes varied during these periods. AL regulated watersheds. During A, with freezing, ST had dominant SGL. B, was entirely frozen due stably low ST, while dropped lowest small changes. C, deep layers (below 50 cm depth) impacted (nonlinear coefficient R2 > 0.74, P < 0.05), whereas change shallow (0–50 showed closer association content. Rainfall major cause for high D. addition, SGLs periods C D closely linked retreat flood runoff. contributed approximately 57.0 %–65.8 % These findings will help facilitate future development utilization water resources

Language: Английский

Citations

9
Does the continuous wetting of the Tibetan Plateau contribute to the accelerated degradation of permafrost? DOI
Yuyang Wang, Jinzhi Ding, Shilong Piao

et al.

Science China Earth Sciences, Journal Year: 2024, Volume and Issue: 67(5), P. 1714 - 1718

Published: April 8, 2024

Language: Английский

Citations

9
An evaluation model for in-situ bioremediation technology of petroleum hydrocarbon contaminated soil DOI
Tao Chen,

Yafu Zhang,

Bo Fu

et al.

Environmental Pollution, Journal Year: 2024, Volume and Issue: 344, P. 123299 - 123299

Published: Jan. 5, 2024

Language: Английский

Citations

6
Pixel-scale historical-baseline-based ecological quality: Measuring impacts from climate change and human activities from 2000 to 2018 in China DOI Creative Commons
Junbang Wang,

Yuefan Ding,

Shaoqiang Wang

et al.

Journal of Environmental Management, Journal Year: 2022, Volume and Issue: 313, P. 114944 - 114944

Published: April 2, 2022

Language: Английский

Citations

25
Express highway embankment distress and occurring probability in permafrost regions on the Qinghai-Tibet Plateau DOI
Yunhui Huang, Fujun Niu, Jianbing Chen

et al.

Transportation Geotechnics, Journal Year: 2023, Volume and Issue: 42, P. 101069 - 101069

Published: July 28, 2023

Language: Английский

Citations

15
Effect of increasing rainfall on the thermal—moisture dynamics of permafrost active layer in the central Qinghai—Tibet Plateau DOI
Zhixiong Zhou, Fengxi Zhou, Mingli Zhang

et al.

Journal of Mountain Science, Journal Year: 2021, Volume and Issue: 18(11), P. 2929 - 2945

Published: Nov. 1, 2021

Language: Английский

Citations

30
Convective heat transfer of spring meltwater accelerates active layer phase change in Tibet permafrost areas DOI Creative Commons
Yi Zhao, Zhuotong Nan, Hailong Ji

et al.

˜The œcryosphere, Journal Year: 2022, Volume and Issue: 16(3), P. 825 - 849

Published: March 11, 2022

Abstract. Convective heat transfer (CHT) is one of the important processes that control near-ground surface in permafrost areas. However, this process has often not been considered most studies, and its influence on freezing–thawing active layer lacks quantitative investigation. The Simultaneous Heat Water (SHAW) model, few land models which CHT well incorporated into soil heat–mass transport processes, was applied study to investigate impacts thermal dynamics at Tanggula station, a typical site eastern Qinghai–Tibet Plateau with abundant meteorological temperature moisture observation data. A experiment carried out quantify changes affected by vertical advection liquid water. Three experimental setups were used: (1) original SHAW model full consideration CHT, (2) modified ignores due infiltration from surface, (3) completely system. results show events occurred mainly during thaw periods melted shallow (0–0.2 m) intermediate (0.4–1.3 depths, their depths significantly greater spring melting than summer. impact minimal freeze deep layers. During periods, temperatures simulated under scenario considering average about 0.9 0.4 ∘C higher, respectively, scenarios ignoring CHT. ending dates zero-curtain effect substantially advanced when heating effect. opposite cooling also present but as frequently upward fluxes differences between In some flow cold reduced depth an −1.0 −0.4 ∘C, respectively. overall annual flux increase favor thawing frozen ground site.

Language: Английский

Citations

20
Responses of soil water dynamics to precipitation events in an alpine meadow ecosystem of the Qinghai Lake Basin based on high‐precision lysimeter measurements DOI
Tingyun Wu, Xiaoyan Li, Fenglin Zuo

et al.

Hydrological Processes, Journal Year: 2023, Volume and Issue: 37(4)

Published: April 1, 2023

Abstract In high‐altitude cold areas, how precipitation and freeze–thaw processes affect soil water dynamics is not well understood due to a lack of high real‐time resolution measurements. This study measured balance components with high‐precision lysimeter in an alpine meadow ecosystem the Qinghai Lake watershed from June 30, 2020, 2021. The results showed that total (TP), evapotranspiration (ET), storage change (ΔS) vertical flow (WF) this were 705.18, 633.21, 72.58 −0.60 mm, respectively, during period. Continuous wet days events larger than 10.00 mm led percolation, while continuous dry strong ET caused upward WF. Pearson correlation analysis suggests instantaneous intensity may be more conducive increase shallow moisture (R 2 > 0.72, p < 0.05). Furthermore, TP thresholds complete thawing period inducing response mattic epipedon layer (0–20 cm) organic (20–40 3.24 16.61 respectively. difference average time single event between was 5.52 ± 3.65 h. These deepen understanding temporal pattern flux ecosystems on Tibetan Plateau.

Language: Английский

Citations

11