Warming or cooling? The impact of heavy summer rainfall on permafrost environments DOI Creative Commons
Alexandra Hamm, Rúna Í. Magnússon,

Ahmad Jan

et al.

Research Square (Research Square), Journal Year: 2022, Volume and Issue: unknown

Published: Nov. 21, 2022

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 first meta-analysis studies reporting effects ground temperatures in environments use a numerical model to explore underlying physical mechanisms under different climatic conditions. Both evaluated body literature 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

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
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

10
Assessment of streamwater age using water stable isotopes in a headwater catchment of the central Tibetan Plateau DOI
Shaoyong Wang, Xiaobo He, Shichang Kang

et al.

Journal of Hydrology, Journal Year: 2023, Volume and Issue: 618, P. 129175 - 129175

Published: Jan. 31, 2023

Language: Английский

Citations

15
Recent advances in hydrology studies under changing permafrost on the Qinghai-Xizang Plateau DOI Creative Commons
Lu Zhou,

Yuzhong Yang,

Dandan Zhang

et al.

Research in Cold and Arid Regions, Journal Year: 2024, Volume and Issue: 16(4), P. 159 - 169

Published: July 18, 2024

Due to the great influences of both climate warming and human activities, permafrost on Qinghai-Xizang Plateau (QXP) has been undergoing considerable degradation. Continuous degradation plateau dramatically modifies regional water cycle hydrological processes, affecting hydrogeological conditions, ground hydrothermal status in cold regions. Permafrost thawing impacts ecological environment, engineering facilities, carbon storage functions, releasing some major greenhouse gases exacerbating change. Despite utilization advanced research methodologies investigate changing processes corresponding influencing factors regions, there still exist knowledge gaps multivariate data, quantitative analysis degradation's impact various bodies, systematic modeling QXP. This review summarizes main methods hydrology elaborates precipitation distribution patterns, changes surface runoff, expansion thermokarst lakes/ponds, groundwater dynamics Then, we discuss current inadequacies future priorities, including multiple methods, observation spatial temporal scales, provide a reference for comprehensive environmental effects QXP under climate.

Language: Английский

Citations

5
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
Latitudinal characteristics of frozen soil degradation and their response to climate change in a high-latitude water tower DOI

Zehua Chang,

Peng Qi, Guangxin Zhang

et al.

CATENA, Journal Year: 2022, Volume and Issue: 214, P. 106272 - 106272

Published: April 13, 2022

Language: Английский

Citations

17
Mechanisms of Suprapermafrost Groundwater Recharge Streamflow in Alpine Permafrost Regions: Insights From Young Water Fraction Analysis DOI Creative Commons
Fa Du, Zongxing Li,

Juan Gui

et al.

Water Resources Research, Journal Year: 2024, Volume and Issue: 60(7)

Published: July 1, 2024

Abstract This study investigates the temporal processes of suprapermafrost groundwater (SPG)‐supplied streamflow in alpine permafrost regions, aiming to fill gap understanding this process from a water‐age perspective. Precipitation, streamflow, and SPG samples were collected Three‐Rivers Headwaters Region (TRHR). We defined physical meaning F yw (the young water fraction) calculated it for first time. The results showed that TRHR, mean travel time (MTT) was 159 days, approximately 46.4% younger than 77 whereas MTT 342 12.2% 97 days. correlation analysis revealed various climatic factors played dominant roles recharge variations SPG‐supplied within TRHR. rate did not significantly affect ; however, thickness active layer ultimately controlled transit distribution. Regression further demonstrated nonlinear impact precipitation, average temperature, freezing days on , which is closely related seasonal freeze–thaw heat conduction advection layer. During initial ablation period, primarily recharged by SPG, resulting short‐tail Our findings provide valuable insights into runoff generation concentration regions have important implications resource management.

Language: Английский

Citations

3
Estimation of stream water components and residence time in a permafrost catchment in the central Tibetan Plateau using long-term water stable isotopic data DOI Creative Commons
Shaoyong Wang, Xiaobo He, Shichang Kang

et al.

˜The œcryosphere, Journal Year: 2022, Volume and Issue: 16(12), P. 5023 - 5040

Published: Dec. 20, 2022

Abstract. Global warming has significantly impacted the hydrological processes and ecological environment in permafrost regions. Mean residence time (MRT) is a fundamental catchment descriptor that provides information regarding storage, flow pathways, water source within particular catchment. However, stable isotopes MRT have rarely been investigated due to limited data collection high-altitude This study uses long-term isotopic observations identify runoff components applied sine-wave exponential model estimate (5300 m a.s.l.) central Tibetan Plateau (TP). We found isotope composition precipitation, stream, supra-permafrost exhibited obvious seasonal variability. The freeze–thaw process of active layer direct input precipitation modified compositions stream water. hydrograph separation revealed accounted for 35 ± 2 % 65 total discharge water, respectively. was estimated at 100 255 d, Such shorter MRTs (compared non-permafrost catchments) might reflect unique characteristics catchments. Moreover, more sensitive environmental change than Climate vegetation factors affected mainly by changing thickness layer. Our results suggest climate retard rate cycle Overall, our expands understanding catchments under global warming.

Language: Английский

Citations

13
Metagenomic insights into the response of rhizosphere microbial to precipitation changes in the alpine grasslands of northern Tibet DOI
Yanling Liu, Yan Yan,

Lijiao Fu

et al.

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 892, P. 164212 - 164212

Published: May 27, 2023

Language: Английский

Citations

5
Heat and moisture transport characteristics in permafrost embankment under seasonal rainfall DOI Creative Commons

Zhanxu Wang,

Laifa Wang,

Xinyan Wang

et al.

Frontiers in Earth Science, Journal Year: 2024, Volume and Issue: 12

Published: Aug. 30, 2024

The Tibetan Plateau has exhibited a discernible trend towards increased precipitation over the past 50 years. However, previous research predominantly focused on thermal stability of permafrost without consideration water flux boundary conditions, and therefore ignored dynamics migration its impacts embankment stability. To bridge this gap, novel water-heat transfer model incorporating rainfall was developed subsequently validated using monitored data. Comparative analyses were then conducted across three distinct intensities to investigate variations in moisture temperature superficial soil. Results indicate events exert notable cooling effect during warm seasons but have little influence cold seasons. By increasing latent heat evaporation, sensible reducing soil flux, results cooling, correlates positively with intensity. Disregarding conditions will overestimate underestimate variation content, especially at Rainfall decline vapor an increase liquid which facilitates rapid downward transport accumulation water. Despite convective water, decrease conduction, evaporation is more pronounced. changes mainly by adjusting energy distribution, delays increases underlying permafrost. When predicting permafrost, it recommended incorporate conditions.

Language: Английский

Citations

1