Bioindicator “fingerprints” of methane-emitting thermokarst features in Alaskan soils DOI Creative Commons
Chuck Smallwood, Nicholas Hasson, Jihoon Yang

et al.

Frontiers in Microbiology, Journal Year: 2025, Volume and Issue: 15

Published: Feb. 21, 2025

Permafrost thaw increases the bioavailability of ancient organic matter, facilitating microbial metabolism volatile compounds (VOCs), carbon dioxide, and methane (CH4). The formation thermokarst (thaw) lakes in icy, organic-rich Yedoma permafrost leads to high CH4 emissions, subsurface microbes that have potential be biogeochemical drivers turnover these systems. However, better characterize quantify rates changes, methods further clarify relationship between processes dynamics are needed. In this study, we investigated four sites (two well-drained mounds, a drained lake, terrestrial margin recently formed lake) determine whether biogenic VOCs (1) can effectively collected during winter, (2) winter sampling provides more biologically significant correlated with metabolic potential. During cold season (March 2023), drilled boreholes at cores simultaneously populations captured VOCs. VOC analysis revealed "fingerprints" were distinct unique each site. Total from included > 400 features, including 40 potentially related metabolism. Subsurface community composition was across sites; for example, methanogenic archaea far abundant site characterized by annual emissions. results obtained method strongly suggest ∼10% biogenic, mapped metabolisms. By revealing dynamics, work advances our ability monitor predict Arctic soils.

Language: Английский

The status and stability of permafrost carbon on the Tibetan Plateau DOI Creative Commons
Cuicui Mu, Benjamin W. Abbott, A. J. Norris

et al.

Earth-Science Reviews, Journal Year: 2020, Volume and Issue: 211, P. 103433 - 103433

Published: Nov. 5, 2020

Language: Английский

Citations

233
Environmental effects of stratospheric ozone depletion, UV radiation, and interactions with climate change: UNEP Environmental Effects Assessment Panel, Update 2020 DOI Creative Commons
Rachel Ε. Neale, Paul W. Barnes,

T. Matthew Robson

et al.

Photochemical & Photobiological Sciences, Journal Year: 2021, Volume and Issue: 20(1), P. 1 - 67

Published: Jan. 1, 2021

Abstract This assessment by the Environmental Effects Assessment Panel (EEAP) of United Nations Environment Programme (UNEP) provides latest scientific update since our most recent comprehensive (Photochemical and Photobiological Sciences, 2019, 18, 595–828). The interactive effects between stratospheric ozone layer, solar ultraviolet (UV) radiation, climate change are presented within framework Montreal Protocol Sustainable Development Goals. We address how these global environmental changes affect atmosphere air quality; human health; terrestrial aquatic ecosystems; biogeochemical cycles; materials used in outdoor construction, energy technologies, fabrics. In many cases, there is a growing influence from seasonality extreme events due to change. Additionally, we assess transmission severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which responsible for COVID-19 pandemic, context linkages with UV radiation Protocol.

Language: Английский

Citations

173
Lake and drained lake basin systems in lowland permafrost regions DOI
Benjamin Jones, Guido Grosse, Louise Farquharson

et al.

Nature Reviews Earth & Environment, Journal Year: 2022, Volume and Issue: 3(1), P. 85 - 98

Published: Jan. 11, 2022

Language: Английский

Citations

95
Permafrost thaw drives surface water decline across lake-rich regions of the Arctic DOI
Elizabeth E. Webb, A. K. Liljedahl, Jada A. Cordeiro

et al.

Nature Climate Change, Journal Year: 2022, Volume and Issue: 12(9), P. 841 - 846

Published: Aug. 29, 2022

Language: Английский

Citations

83
High carbon emissions from thermokarst lakes and their determinants in the Tibet Plateau DOI
Cuicui Mu, Mei Mu, Xiaodong Wu

et al.

Global Change Biology, Journal Year: 2023, Volume and Issue: 29(10), P. 2732 - 2745

Published: March 1, 2023

Thermokarst lakes are potentially important sources of methane (CH4 ) and carbon dioxide (CO2 ). However, considerable uncertainty exists regarding emissions from thermokarst owing to a limited understanding their patterns motivators. In this study, we measured CH4 CO2 diffusive fluxes in 163 the Qinghai-Tibet Plateau (QTP) over 3 years May October. The median QTP were 1440 mg m-2 day-1 60 , respectively. rates related catchment land cover type. Sediment microbial abundance hydrochemistry explain 51.9% 38.3% total variance emissions, respectively, while show no significant relationship with environmental factors. When upscaling lakes, annual average release per lake area is equal that pan-Arctic region. Our findings highlight importance incorporating situ observation data different emission pathways for types predicting future.

Language: Английский

Citations

49
Geomorphological and Climatic Drivers of Thermokarst Lake Area Increase Trend (1999–2018) in the Kolyma Lowland Yedoma Region, North-Eastern Siberia DOI Creative Commons
Alexandra Veremeeva, Ingmar Nitze, Frank Günther

et al.

Remote Sensing, Journal Year: 2021, Volume and Issue: 13(2), P. 178 - 178

Published: Jan. 6, 2021

Thermokarst lakes are widespread in Arctic lowlands. Under a warming climate, landscapes with highly ice-rich Yedoma Ice Complex (IC) deposits particularly vulnerable, and thermokarst lake area dynamics serve as an indicator for their response to climate change. We conducted change trend analysis 44,500 km2 region of the Kolyma Lowland using Landsat imagery conjunction TanDEM-X digital elevation model Quaternary Geology map data. delineated yedoma–alas relief types different yedoma fractions, serving base geospatial dynamics. quantified changes over 1999–2018 period machine-learning-based classification robust trends multi-spectral indices data object-based long-term detection. analyzed separately 1999–2013 periods, including most recent five years that were characterized by very high precipitation. Comparison drained basin extents reveal overall limnicity decrease 80% during Holocene. Current wetting led increase 0.89% 4.15% period. geomorphological factors impacting modern both periods such size, elevation, type. detected expansion fraction areas indicating ongoing IC degradation thermokarst. Our concept differentiating helps characterize landscape-scale could potentially be applied refined assessments greenhouse gas emissions regions. Comprehensive inventories regions provide better understanding extent processes Holocene pre-conditioning

Language: Английский

Citations

57
Sentinel‐Based Inventory of Thermokarst Lakes and Ponds Across Permafrost Landscapes on the Qinghai‐Tibet Plateau DOI
Zhiqiang Wei,

Zhiheng Du,

Lei Wang

et al.

Earth and Space Science, Journal Year: 2021, Volume and Issue: 8(11)

Published: Oct. 26, 2021

Abstract Thermokarst lakes and ponds (hereafter referred to as thaw lakes) play an important role in the permafrost regions by regulating hydrology, ecology, biogeochemistry. However, detailed quantitative information on lake extent distribution remains poorly resolved across entire Qinghai‐Tibet Plateau (QTP). Here, we applied random forest (RF) model manual visual vectorization methods extract boundaries QTP based Sentinel‐2 images. Accuracy assessment was comprehensively demonstrated regarding inherent spatial resolution of imagery RF performance. The results showed that accumulated uncertainty total area ±5.75 km 2 , mean accuracy (91.9%) from field‐measured 132 supported this inventory. A ∼161,300 with sizes ranging 500 m 3 were detected, a ∼2,825.45 ± 5.75 . Most detected continuous type (94.1%) within elevations 4,500–5,000 (68.4%). small (<10,000 ) predominated number (78.9%) but contributed portion (12.7%). Spatial distributions terms different climatic environmental conditions also explored, including temperature, precipitation, ground thermal stability, active layer thickness, vegetation, soil properties, underground ice content. This inventory is expected be incorporated into Earth system models for more comprehensive projection large‐scale biogeochemical feedback thermokarst landforms under continued global warming.

Language: Английский

Citations

56
A trained Mask R-CNN model over PlanetScope imagery for very-high resolution surface water mapping in boreal forest-tundra DOI Creative Commons
Pedro Freitas, Gonçalo Vieira, João Canário

et al.

Remote Sensing of Environment, Journal Year: 2024, Volume and Issue: 304, P. 114047 - 114047

Published: Feb. 13, 2024

Small water bodies (< 0.01 km2) showing diverse limnological properties occur in great abundance across the boreal forest and tundra landscapes of Arctic Subarctic. However, their classification, geographical distribution collective importance for water, heat, nutrient, contaminant carbon cycles are still poorly constrained. One important step better understanding role evolution small fast-changing northern is to develop image analysis protocols that allow automatic remote sensing detection, delineation inventory. In this study, we set an protocol (High Latitude Water – HLWATER V1.0) based on a trained supervised Mask R-CNN deep learning model over PlanetScope imagery detection lakes ponds were absent existing datasets. Most our training dataset comprised smaller than km2 (97%) spanned wide range environmental hydrological settings, from sporadic continuous permafrost zones Canada. The was tested as fully autonomous approach eastern Hudson Bay, Nunavik (Subarctic Canada), region poses challenges given variety bodies. These mainly thaw glacial basin forest-tundra challenging optical settings influenced by vegetation or topography shadowing, revealing peat logging, fen bog pond conditions. A multi-scale validation developed using body delineations ultra-high resolution orthomosaics Unoccupied Aerial Systems. This procedure allowed sub-pixel assessment identified limitations strengths detecting large results varied according different landscape units, with mean Intersection Union (IoU) 0.5 F1 Scores 0.53 0.71 0.62 0.95. Considering 166 m2 minimum size threshold, IoU 0.7 0.91 0.76 0.83, evaluated comparing manual delineations. show high potential extension other regions Subarctic, allowing detailed inventories optically morphologically areas circumpolar North.

Language: Английский

Citations

11
The interaction between thermokarst lake drainage and ground subsidence accelerates permafrost degradation DOI Creative Commons
Yining Yu, Fengming Hui,

Yu Zhou

et al.

Advances in Climate Change Research, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Language: Английский

Citations

1
Changes in the Distribution of Thermokarst Lakes on the Qinghai-Tibet Plateau from 2015 to 2020 DOI Creative Commons

Robert P. Wei,

Xia Hu, Shaojie Zhao

et al.

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