Journal of Earth Science, Journal Year: 2024, Volume and Issue: unknown
Published: Oct. 21, 2024
Language: Английский
Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)
Published: May 30, 2023
Understanding methane (CH4) emission from thermokarst lakes is crucial for predicting the impacts of abrupt thaw on permafrost carbon-climate feedback. However, observational evidence, especially high-altitude regions, still scarce. Here, by combining field surveys, radio- and stable-carbon isotopic analyses, metagenomic sequencing, we present multiple characteristics CH4 emissions 120 in 30 clusters along a 1100 km transect Tibetan Plateau. We find that have high during ice-free period (13.4 ± 1.5 mmol m-2 d-1; mean standard error) across this alpine region. Ebullition constitutes 84% emissions, which are fueled primarily young carbon decomposition through hydrogenotrophic pathway. The relative abundances methanogenic genes correspond to observed fluxes. Overall, parameters obtained study provide benchmarks better strength feedback regions.
Language: Английский
Citations
39
Journal of Geophysical Research Biogeosciences, Journal Year: 2024, Volume and Issue: 129(2)
Published: Feb. 1, 2024
Abstract Inland waters are significant emitters of greenhouse gases for the atmosphere and play an important role in global carbon cycle. With a vast land area East Asia spanning broad range climatic conditions, China has large number natural human‐made water bodies. These inland systems importance because their high emission fluxes. Over past decades, experienced unprecedented environmental changes driven by rapid economic development, which have profoundly modified its biogeochemistry associated emissions. This review focuses on dioxide (CO 2 ) methane (CH 4 dynamics from China's response to change. Major drivers CO CH emissions, including aquatic metabolism, hydrological factors, prevailing human impacts, examined. To advance our understanding emissions waters, we further identify several critical knowledge gaps, such as inadequate research headwater streams climate‐sensitive Tibetan Plateau ecosystems. Furthermore, insufficient undergoing extensive interventions (e.g., damming, flow regulation, pollution, farming practices aquaculture ponds) is highlighted. We suggest that future efforts should be made better capture spatiotemporal heterogeneity dissolved concentrations fluxes across well long‐term trends. overcome uncertainties sources current flux estimates, mechanistically understand transport transformation Chinese underlying processes particularly needed.
Language: Английский
Citations
11
Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(16), P. 7032 - 7044
Published: April 11, 2024
High-elevation mountains have experienced disproportionately rapid warming, yet the effect of warming on lateral export terrestrial carbon to rivers remains poorly explored and understood in these regions. Here, we present a long-term data set dissolved inorganic (DIC) more detailed, short-term DIC, δ13CDIC, organic from two major Qinghai–Tibetan Plateau, Jinsha River (JSR) Yalong (YLR). In higher-elevation JSR with ∼51% continuous permafrost coverage, (>3 °C) increasing precipitation coincided substantially increased DIC concentrations by 35% fluxes 110%. lower-elevation YLR ∼14% permafrost, such increases did not occur despite comparable extent warming. Riverine particulate discharge (mobilization) both rivers. JSR, transitioned dilution (decreasing concentration discharge) earlier, colder years chemostasis (relatively constant concentration) later, warmer years. This changing pattern, together lighter δ13CDIC under high discharge, suggests that thawing boosts production via enhancing soil respiration weathering. These findings reveal predominant role altering escalating modifying patterns.
Language: Английский
Citations
9
Remote Sensing, Journal Year: 2025, Volume and Issue: 17(7), P. 1174 - 1174
Published: March 26, 2025
Thermokarst lakes are widely distributed on the Qinghai-Tibet Plateau (QTP). However, owing to lack of high-precision remote sensing imagery and difficulty in situ monitoring permafrost regions, quantifying changes distribution thermokarst is challenging. In this study, we used four machine learning methods—random forest (RF), gradient boosting decision tree (GBDT), classification regression (CART), support vector (SVM)—and combined various environmental factors assess from 2015 2020 via Google Earth Engine (GEE). The results indicated that RF model performed optimally extraction lakes, followed by GBDT, CART, SVM. From 2020, number increased 52%, area expanded 1.6 times. A large proportion STK (with areas less than or equal 1000 m2) gradually developed into MTK between 10,000 central part QTP. Additionally, located primarily at elevations 4000 5000 m, with slopes ranging 0 5°, sand content approximately 65%. normalized difference water index (NDWI) enhanced vegetation (EVI) were most favourable for lake extraction. provide a scientific reference assessment prediction dynamic QTP future, which will have important significance studies carbon processes alpine ecosystems.
Language: Английский
Citations
1
Environmental Research Letters, Journal Year: 2023, Volume and Issue: 18(9), P. 094025 - 094025
Published: July 28, 2023
Abstract Carbon dioxide (CO 2 ) and methane (CH 4 emissions from freshwater ecosystems are predicted to increase under climate warming. However, in glacierized regions differ critically those non-glacierized regions. The potential of CO CH environments the Tibetan Plateau (TP) were only recently recognized. Here, first direct measurement emission fluxes isotopic composition during spring 2022 13 glacial lakes TP revealed that previously overlooked sinks due chemical weathering daily average flux was −5.1 ± 4.4 mmol m −2 d −1 , consumption could reach 38.9 Gg C-CO yr by all TP. This might be larger summer when glaciers experience intensive melting, highlighting importance uptake on global carbon cycle. studied sources with total ranging 3.3 4082.5 795.6 μ mol . large range attributed ebullition found three lakes. Low dissolved organic concentrations oxidation responsible for low diffusive without ebullition. In addition, groundwater input alter probably had a thermogenic source; whereas influenced mainly atmospheric input, as well matter remineralization oxidation. Overall, play an important role cycle budget, more detailed microbial studies needed constrain contributions different pathways production, emissions.
Language: Английский
Citations
18
Global Biogeochemical Cycles, Journal Year: 2024, Volume and Issue: 38(4)
Published: April 1, 2024
Abstract Comprehensive seasonal observation is essential for accurately quantifying methane (CH 4 ) emissions from ponds and lakes in permafrost regions. Although CH during ice thaw are important highly variable high‐latitude freshwater (north of ∼50°N), their contribution seldom included estimates aquatic‐atmospheric exchange across different alpine ecosystems. Here, we characterized annual emissions, including thaw, four vegetation zones the Qinghai‐Tibet Plateau (QTP) region. We observed significant spatial variability emission rates (8.44−421.05 mmol m −2 yr −1 ), (0.26−144.39 to (3−33%) zones. Dissolved oxygen concentration under ice, along with substrate availability water salinity, played critical roles influencing flux thaw. estimated QTP region as 0.04 (0.03−0.05) Tg (median (first quartile−third quartile)), approximately 20% occurring Notably, average areal rate amounts only 8% that waterbodies, primarily due dominance large saline lower Our findings emphasize significance incorporating comprehensive better predicting lakes.
Language: Английский
Citations
7
Journal of Hydrology, Journal Year: 2024, Volume and Issue: 632, P. 130832 - 130832
Published: Feb. 9, 2024
Language: Английский
Citations
6
Science China Life Sciences, Journal Year: 2024, Volume and Issue: 67(9), P. 1833 - 1848
Published: June 26, 2024
Language: Английский
Citations
6
The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 946, P. 174074 - 174074
Published: June 21, 2024
Language: Английский
Citations
5
Scientific Reports, Journal Year: 2024, Volume and Issue: 14(1)
Published: April 15, 2024
It is important to investigate the responses of greenhouse gases climate change (temperature, precipitation) and anthropogenic factors in plateau wetland. Based on DNDC model, we used meteorological, soil, land cover data simulate soil CO2 emission pattern its Guizhou, China. The results showed that mean flux Caohai Karst Plateau Wetland was 5.89 ± 0.17 t·C·ha-1·yr-1 from 2000 2019, annual variation an increasing trend with rate 23.02 kg·C·ha-1·yr-1. total emissions were 70.62 2.04 Gg·C·yr-1 (annual growth 0.28 Gg·C·yr-1). wetland has great spatial heterogeneity. around Lake high (the areas high, middle, low values accounted for 3.07%, 70.96%, 25.97%, respectively), characterized by a decrease radiation periphery. In addition, cropland forest exhibited intensities (7.21 0.15 6.73 0.58 t·C·ha-1·yr-1, respectively) (54.97 1.16 10.24 0.88 Gg·C·yr-1, respectively). Croplands forests major types controlling wetland, while (cultivation) significantly increased emissions. Results positively correlated temperature precipitation; had greater impact respiration than precipitation. Our indicated future (increased may promote increase karst wetlands, reasonable control measures (e.g. returning lakes reducing factors) are keys
Language: Английский
Citations
4