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17 results for “thermokarst lake”
Risk assessment (susceptibility) of thaw slumps and thermokarst lakes in the Yangtze River source region
<p>Due to the influence of climate warming, the degradation of permafrost on the Qinghai-Tibet Plateau (QTP) has become evident. The formation of thermokarst hazards induced by the degradation of ice-rich permafrost has a significant impact on infrastructure construction and local ecology; therefore, it is necessary to assess its risk. In this study, a novel multiple thermokarst hazards risk assessment framework was proposed by combining stacking machine learning and potential environmental factors (vegetation factors, terrain factors, climate factors, and soil factors) to assess the risk of thermokarst hazards in the Yangtze River source region (YRSR). The results show the risk assessment (susceptibility) of thermokarst hazards in the YRSR from 2000 to 2016 at 500 m spatial resolution. This study divided the risk into 5 levels: very low (0.0-0.2), low (0.2-0.4), moderate (0.4-0.6), high (0.6-0.8), and very high (0.8-1.0) </p>
The first 10m resolution thermokarst lake and pond data set in the Lena basin during 2020 thawing season
<p>We present the first 10m resolution thermokarst lake and pond data set in the Lena basin during 2020 thawing season. A mapping workflow was proposed and implemented on the Google Earth Engine (GEE) platform. The accuracy assessment demonstrates a satisfactory overall accuracy of 93.63%, and comparing with several land cover and waterbody products, our results exhibited better consistency with TLPs under real conditions.</p>
Chemistry from thermokarst impacted soils, lakes, and streams near Toolik Lake Alaska, 2008-2011.
This file contains data collected from thermokarst impacted soils, lakes, and streams near Toolik Lake Alaska. Data are also presented for experimental manipulations of water (e.g., time course experiments). Sample descriptors include a unique sortchem #, site, date, time, depth, distance, elevation, treatment, date-time, category, and water type (e.g., lake, surface, soil). Physical/chemical measures collected in the field include temperature, conductivity, and pH. Chemical analyses performed later include alkalinity; dissolved inorganic and organic carbon (DIC and DOC); inorganic and total dissolved nutrients (NH4, PO4, NO3, TDN, TDP); particulate carbon, nitrogen, and phosphorus (PC, PN, and PP); cations (Ca, Mg, Na, K, and Si); anions (SO4 and Cl); chlorophyll a, and oxygen. Note that archived data from before the NSF ARCSS-Thermokarst project started in 2009, and funded by NSF from 1988-2008 (e.g., by the NSF ARC LTER), are included in this dataset.
Meteorological data near thermokarst sites around Toolik Lake Field Station, Summer 2009-Summer 2012
GroMeteorological parameters were measured hourly adjacent to thermokarst features in the region around Toolik Field Station. Pressure, rainfall, wind speed and direction, solar radiation, air temperature and relative humidity were all measured at 1-3m above the ground surface with an Onset U30 weather station connected to all sensors.
A dataset of thermokarst lake drainage events in northern Alaska (2000-2020)
<p>The catastrophic thermokarst lake drainage events occurring in the circumpolar Arctic permafrost region are referred to as the new Arctic hazard. To accurately detect this disturbance process, the authors performed a time series analysis of changes in the thermokarst lake region of northern Alaska since 2000 using all available Landsat TM, ETM+, and OLI continuous data on the Google Earth Engine platform. This dataset includes 90 thermokarst lake drainage events detected in northern Alaska during 2000-2020 and year-by-year water distribution maps based on AWEI. The thermokarst lake drainage events are published in Shapefile format, including information on the area, location, drainage proportion, and year of drainage for each drained lake.</p>
Biogeochemical distinctiveness of peatland ponds, thermokarst waterbodies and lakes
<p>This archive entry contains the original dataset used in the manuscript "Biogeochemical distinctiveness of peatland ponds, thermokarst waterbodies and lakes" as a CSV file (Arsenault-et-al_All.csv). The dataset is a global synthesis of the biogeochemical properties of lakes, peatland ponds and thermokarst waterbodies. It comprises a total of 12,475 observations (11,357 lakes worldwide, 827 thermokarst waterbodies from the Arctic circumpolar and the Himalaya regions and 291 peatland ponds from North America, Europe and Patagonia, from published and unpublished sources). The entry also includes subsets of the main dataset used to performed statistical analyses to compare and distinguish the biogeochemical properties of lakes, peatland ponds and thermokarst waterbodies (see file Tables_Statistical-analyses.pdf for details).</p> <p>The archive entry also contains the list of references from which we built the dataset, as a TXT file.</p>
Ground temperature at and near I-Minus-2 thermokarst sites around Toolik Lake Field Station, Alaska, Summer 2009-Summer 2012
Ground temperatures were measured hourly at ~20-50cm intervals below the ground surface inside and adjacent to thermokarst features in the region around Toolik Field Station. Ground temperatures were measured using Hobo thermistors. Temperatures at 0 and 20cm depths were measured directly in the ground whereas 40cm and deeper measurements were logged from dry wells installed in summer 2009. IM2_GT01dot06_temp is located inside of the I-Minus-2 Gulley thermokarst, downslope.
Ground temperature at and near NE 14 thermokarst sites around Toolik Lake Field Station, Alaska, Summer 2009-Summer 2012
Ground temperatures were measured hourly at ~20-50cm intervals below the ground surface inside and adjacent to thermokarst features in the region around Toolik Field Station. Ground temperatures were measured using Hobo thermistors. Temperatures at 0 and 20cm depths were measured directly in the ground whereas 40cm and deeper measurements were logged from dry wells installed in summer 2009. NE14_TS02dot02_temp is located in the old NE14 thermokarst, upslope.
Ground temperature at and near Toolik River thermokarst sites around Toolik Lake Field Station, Alaska, Summer 2009-Summer 2012
Ground temperatures were measured hourly at ~20-50cm intervals below the ground surface inside and adjacent to thermokarst features in the region around Toolik Field Station. Ground temperatures were measured using Hobo thermistors. Temperatures at 0 and 20cm depths were measured directly in the ground whereas 40cm and deeper measurements were logged from dry wells installed in summer 2009. TRTK_GT01dot05_temp is located outside the TRTK thermokarst, midslope.
GHGs data from thermokarst lakes on Tibetan Plateau
<p>Data tables containing methane and carbon dioxide concentrations and fluxes from 10 thermokarst lakes and ponds on the Tibetan Plateau, including methane and carbon dioxide concentrations in thermokarst lakes and ponds with different water depths, and methane and carbon dioxide diffusive fluxes during ice thaw and ice free periods. </p>
Patterns and drivers of prokaryotic communities in thermokarst lake water across Northern Hemisphere
<p><span><strong>Aim</strong>:</span><span> The formation of thermokarst lakes could make a large amount of carbon accessible to microbial degradation, potentially intensifying the permafrost carbon-climate feedback via carbon dioxide/methane emissions. Because of their diverse functional roles, prokaryotes play a key role in mediating biogeochemical cycles in thermokarst lakes. However, little is known about the large-scale patterns and drivers of these communities.</span></p> <p><span><strong>Location</strong>:</span><span> Permafrost regions in the Northern Hemisphere.</span></p> <p><span><strong>Time</strong> <strong>Period</strong>:</span><span> Present day.</span></p> <p><span><strong>Major taxa studied</strong>:</span><span> Prokaryotes.</span></p> <p><span><strong>Methods</strong>:</span><span> Based on a combination of large-scale measurements on the Tibetan Plateau and data syntheses in pan-Arctic regions, we constructed a comprehensive dataset of 16S rRNA sequences from 258 thermokarst lakes across Northern Hemisphere permafrost regions. We also used the local contributions to beta diversity (LCBD) to characterize the variance of prokaryotic species composition and screened underlying drivers by conducting a random forest modeling analysis.</span></p> <p><span><strong>Results</strong>:</span><span> Prokaryotes in thermokarst lake water were dominated by the orders Burkholderiales, Micrococcales, Flavobacteriales, </span><span>and Frankiales. The relative abundance of dominant taxa</span><span> was positively associated with dissolved organic matter (DOM) properties, especially for the chromophoric/aromatic compounds. Microbial structure differed between high-altitude and high-latitude thermokarst lakes, with the dominance of <em>Flavobacterium</em> in high-altitude lakes, and the enrichment of <em>Polynucleobacter</em> in high-latitude lakes. More importantly, climatic variables were among the main drivers shaping the large-scale variation of prokaryotic communities. Specifically, mean annual precipitation was the best predictor for prokaryotic beta diversity across the Northern Hemisphere, as well as in the high-altitude permafrost regions, while mean annual air temperature played a key role in the high-latitude thermokarst lakes.</span></p> <p><span><strong>Main</strong> <strong>conclusions</strong>:</span><span> Our findings demonstrate significant associations between dominant taxa and DOM properties, as well as the important role of climatic factors in affecting prokaryotic communities. These findings suggest that climatic change may alter DOM conditions and induce dynamics in prokaryotic communities of thermokarst lake water in the Northern Hemisphere.</span></p>
Patterns and drivers of prokaryotic communities in thermokarst lake water across Northern Hemisphere
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Contrasting evolution patterns of thermokarst lake and its potential driver on the Qinghai Tibetan Plateau
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ABoVE: Methane Flux across Two Thermokarst Lake Ecosystems, Interior Alaska, 2018
This dataset provides diffusive methane (CH4) fluxes collected from two thermokarst lakes in the Goldstream Valley, north of Fairbanks in interior Alaska. Fluxes were collected from the littoral zones, adjacent shoreline, and upland vegetation. The data were collected during July 2018. Measurements were made using a mobile, closed chamber technique where chamber air was recirculated through a Los Gatos Research (LGR) Ultraportable Cavity Ring-down Spectrometer. The chamber was large enough to enclose emergent and upland vegetation up to 1.5 m in height, allowing plant-facilitated fluxes to be measured. These in situ measurements were used to verify spatial patterns in methane flux (i.e., exponential decay with distance from water) detected by NASA's Next Generation Airborne Visible/Infrared Imaging Spectrometer (AVIRIS-NG).
carbon emissions from thermokarst lakes
<p>The datasets include all the original data and the code.</p>
Thermokarst lakes on the Tibetan Plateau from 1990 to 2022
<p>Recent climate warming has accelerated the permafrost thaw and dynamics of thermokarst lakes (TLs) on the Tibetan Plateau. Using the global surface water product, we compiled an inventory of TLs with areas ranging from 1-300 ha, and categorized them as unchanging, expanding, emerging, shrinking and vanishing. Based on time-series remote sensing imagery, we identified the primary occurrence year of lake changes from 1990 to 2022. Also, this dataset includes information on the topographic and permafrost characteristics of TLs.</p>
Vital contribution of methane to total carbon emissions from thermokarst lakes: Data
<p>Main data for the related manuscript.</p>
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
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OpenNeuro
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