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41 results for “Glacial Lakes”
Input and output used in publication "Glacial isostatic adjustment shapes proglacial lakes over glacial cycles"
<p>Here we provide the input ice history and topography used for the modeling along with the output sea level and proglacial lake volume & geometries. Please see the read.me file and publication for details. Note that version 1 had incorrect files saved for some of the output, including the default run LAM_PC. Please use version 2 when recreating our results. </p>
Population dynamics of the glacial relict amphipod Monoporeia affinis in a subarctic lake
<p>Seasonal and interannual (2002–2019) variations in the abundance (ind. m<sup>-2</sup>) and population structure of the glacial relict amphipod <em>Monoporeia affinis</em> in a small subarctic Lake Krivoe (North-West of the Russian Federation) are presented. The study site (66⁰ 20.774′ N and 33⁰ 37.77′ E) was situated in the sublittoral zone at the depth of 8.5 m. Materials were collected from June 2002 to December 2019 mainly during the ice-free period (late May – October) as a rule, 4–5 times a season. <br> In addition, the next data sets used in interpretation of population dynamics are presented:<br> (1) Changes in mean near- bottom (7–8 m) temperature (± range) and mean chlorophyll <em>a</em> (0–7 m) concentration (<em>µ</em>g l<sup>-1</sup>) gat study site during open-water period (May – October) in 2002–2019.<br> (2) Changes in mean annual abundance (ind. m<sup>-2</sup>) of main macrobenthic taxa at study site in 2002–2019.</p>
Traversing the Great Lakes: Post-glacial colonization by a widespread terrestrial salamander
<p><strong>Aims:</strong> Glacial retreat at the end of the Pleistocene epoch opened vast expanses of emergent habitat in the northern hemisphere that were colonized by opportunistic taxa. However, species that undergo post-glacial expansion may have originated from one or several glacial refugia. We inferred the post-glacial expansion history of the Eastern Red-backed Salamander (<em>Plethodon cinereus</em>), a fully terrestrial species with a vast distribution despite severe dispersal limitations. Previous studies indicated populations south of the glacial boundary at the eastern and western limits of the distribution were closely related, suggesting either multiple refugia or an extraordinary post-glacial expansion event.</p> <p><strong>Location:</strong> Eastern North America.</p> <p><strong>Taxon:</strong> <em>Plethodon cinereus</em> (Green, 1818), Caudata: Plethodontidae.</p> <p><strong>Methods: </strong>We collected ddRAD-seq data from 106 individuals throughout the distribution of <em>P. cinereus</em>. We estimated phylogeographic structure, including finer-scale structure among the post-glacial populations. To test the origins and routes of colonization, we used ecological niche modeling, population trees, and analyses of directional range expansion.</p> <p><strong>Results: </strong>Analyses supported our hypothesis of a southeastern glacial refugium, with northward expansion along the Eastern Seaboard prior to westward invasion into the Great Lakes region, including southwestern expansion into unglaciated areas at the western end of the distribution. However, a distinct subgroup in the northwestern portion of the range raises the possibility of a second refugium near the ice-free Driftless Area.</p> <p><strong>Main conclusions:</strong> Based on our results, we hypothesize a southeastern refugium from which most of today's northern populations undertook extensive post-glacial colonization. Our results indicate a geographically non-linear colonization history for <em>P. cinereus</em>.</p>
Data from: Lake sediment multi-taxon DNA from North Greenland records early post-glacial appearance of vascular plants and accurately tracks environmental changes
High Arctic environments are particularly sensitive to climate changes, but retrieval of paleoecological data is challenging due to low productivity and biomass. At the same time, Arctic soils and sediments have proven exceptional for long-term DNA preservation due to their constantly low temperatures. Lake sediments contain DNA paleorecords of the surrounding ecosystems and can be used to retrieve a variety of organismal groups from a single sample. In this study, we analyzed vascular plant, bryophyte, algal (in particular diatom) and copepod DNA retrieved from a sediment core spanning the Holocene, taken from Bliss Lake on the northernmost coast of Greenland. A previous multi-proxy study including microscopic diatom analyses showed that this lake experienced changes between marine and lacustrine conditions. We inferred the same environmental changes from algal DNA preserved in the sediment core. Our DNA record was stratigraphically coherent, with no indication of leaching between layers, and our cross-taxon comparisons were in accordance with previously inferred local ecosystem changes. Authentic ancient plant DNA was retrieved from nearly all layers, both from the marine and the limnic phases, and distinct temporal changes in plant presence were recovered. The plant DNA was mostly in agreement with expected vegetation history, but very early occurrences of vascular plants, including the woody Empetrum nigrum, document terrestrial vegetation very shortly after glacial retreat. Our study shows that multi-taxon metabarcoding of sedimentary ancient DNA from lake cores is a valuable tool both for terrestrial and aquatic paleoecology, even in low-productivity ecosystems such as the High Arctic.
Traversing the Great Lakes: Post-glacial colonization by a widespread terrestrial salamander
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Population dynamics of the glacial relict amphipod Monoporeia affinis in a subarctic lake
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Data from: Lake sediment multi-taxon DNA from North Greenland records early post-glacial appearance of vascular plants and accurately tracks environmental changes
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Data from: Evolution and diversity of two cisco forms in an outlet of glacial Lake Algonquin
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Population collapse in viviparid gastropods of the Lake Victoria ecoregion started before the Last Glacial Maximum
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Inventory and GLOFs susceptibility of pro-glacial lakes in Chenab basin, western Himalaya
<p><span>Global warming has resulted in an increase in glacial mass loss, leading to the formation and expansion of numerous glacial lakes across high mountain areas worldwide. The expansion of glacial lakes and subsequent Glacial Lake Outburst Floods (GLOFs) pose a significant threat and cause catastrophic damage to livelihoods and infrastructure up to hundreds of kilometers downstream. Previous studies have reported the rapid expansion of glacial lakes and several notable destructive past GLOF events in the Himalayan region, suggesting a necessity for timely and updated inventory and GLOF susceptibility at basin scale. Here, an updated inventory of pro-glacial lakes across the Chenab basin, western Himalayas is generated based on 10-m Sentinel-2 datasets for 2022. Additionally, temporal changes and GLOF susceptibility of glacial lakes (>0.05 km²) were evaluated using multi criteria-based Analytical Hierarchical Process (AHP) where nine factors are considered. Glacial lakes are classified into low, medium, high, and very high GLOF susceptibility classes depending on their susceptibility index. The result shows the presence of 419 lakes (>0.001 km²) with a total area of 9.97 ± 0.67 km² across the basin in 2022. <span>The total area of the glacial lakes in 1990 was 3.92 ± 0.58 km², which expanded by </span></span><span>∼</span><span>75%, reaching 6.86 ± 0.25 km² in 2022. </span><span>Furthermore, out of 42 lakes (>0.05 km²) assessed, six were identified with very high GLOF susceptibility. We underline that the role of local geomorphology (i.e., avalanche, rockfall) and pronounced glacier-lake interaction under warming climate scenarios likely increase the GLOF susceptibility in the region. Regular monitoring and more detailed fieldwork-based investigation for these highly susceptible glacial lakes are necessary. This study will benefit early warning and disaster risk reduction of downstream communities.</span></p>
A dataset of global lake-level simulations and reconstructions since the Last Glacial Maximum
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Spatiotemporal Distribution Characteristics of Glacial Lakes from 1990 to 2023
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An ice-snow avalanche triggered small glacial lake outburst flood in Birendra Lake, Nepal Himalaya
<p>The Video shows the rapid ice-snow avalanche from the Manaslu glacier into the Birendra lake, flooded with large chuncks of ice that displaced water from the lake producing outburst floods as seen in downstream river. The video is collected and merged from different sources by Nitesh Khadka.</p> <p>The paper linked to this video can be accessed through: https://link.springer.com/article/10.1007/s11069-024-07014-0#article-info</p> <p>Please Cite: Khadka, N., Zheng, G., Chen, X. <em>et al.</em> An ice-snow avalanche triggered small glacial lake outburst flood in Birendra Lake, Nepal Himalaya. <em>Nat Hazards</em> (2024). https://doi.org/10.1007/s11069-024-07014-0</p>
Rapid glacier shrinkage and glacial lake expansion of a China-Nepal transboundary catchment in the Central Himalaya, between 1964 and 2020
<p>Glacial data set of Tama Koshi Basin (1964-2020), including glacier, glacial lake, and code.</p>
Glacial lake outburst flood simulations for Poiqu Basin
<p>This zip file contains simulation results (conducted with r.avaflow) for large ice/rock avalanche triggered glacial lake outburst floods in the Poiqu Basin. These results are presented in the paper by Allen et al. 2022, <em>Glacial lake outburst flood hazard under current and future conditions: worst-case scenarios in a transboundary Himalayan basin, </em>Natural Hazards and Earth System Science, https://doi.org/10.5194/nhess-22-1-2022.</p> <p>Raster files of flow height are provided for simulations of Galongco, Jialongco (for the lake volume in 2019, and for the reduced lake volume in 2021), and for the Future Lake. An Excel file provides a time series of flow height and discharge at cross sections measured at the outlet of the lake (moraine), in the town of Nyalam, and in Zhangmu for each simulation.</p>
Glacial lake inventory over Boshula in 2021
<p>This dataset include the shape files of glacial lake inventory over Boshula mountain ranges in 2021 delineated by DeepLabv3+ from multi-source satellite images with manual refinement.</p>
Glacial lake inventories in the 1960s and 2020 and GLOF susceptibility along the Sichuan-Tibet Railway
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High Mountain Asia Near-Global Multi-Decadal Glacial Lake Inventory V001
This data set contains polygons of glacial lake extent on a near-global scale, averaged over five multi-year periods between 1990 and 2018.
Spatio-temporal analysis of glacial lakes from 1990 to 2018 in the Kashmir Himalaya, India using geospatial technology
<p>The glacial lakes were identified, delineated, and mapped to observe changes in spatial extent using multi-date/multi-sensor remote sensing data and adequately supplemented by field studies. Landsat imageries were used to delineate the spatial extent of glacial lakes for four time points i.e., 1990, 2000, 2010 and 2018. The total count of lakes as well as their spatial extent showed a discernible increase. The number has increased from 253 in 1990 to 322 in 2018 with a growth rate of 21.4 percent. The area has increased from 18.84 Km<sup>2 </sup>in 1990 to 22.11 Km<sup>2</sup> in 2018 with a growth rate of 14.7 percent. The newly formed glacial lakes including supra glacial lakes were greater in number than the lakes that have disappeared over the study period. All glacial lakes are situated at an elevation of 2700 m asl and 4500 m asl. More than 78 percent of lake expansion in the study region consists largely due to growth of existing glacial lakes. Through the area change analysis, our findings reveal that certain lakes show rapid expansion needing immediate monitoring and observation. In addition to climate variability, the presence of increasing quantities of light trapping particles could be possible causes for expanding of lakes in the Himalayas. Consequently, this study could play a significant role in devising a comprehensive risk assessment plan of potential GLOFs and develop a mechanism for continuous monitoring and management of lakes in the study region.</p>
Glacial lakes in Chenab basin- All info
<p>This paper has been published in Geomatics Natural Hazards and Risk. </p>
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