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774 results for “glacier”
Internal gravity waves generated by subglacial discharge: Implications for tidewater glacier melt.
<p>Additional data used in the paper titled "Internal gravity waves generated by subglacial discharge: implications for tidewater glacier melt", submitted to Geophysical Research Letters, that is not already contained in the GitHub repository.</p>
10-year glacier mass changes from CryoSat-2 radar altimetry
<p>We generate a record of ice loss across glaciers from CryoSat-2 swath interferometric radar altimetry. We resolve changes at 500m resolution for Arctic Canada North and South, Greenland periphery glaciers, Iceland, Svalbard, Franz Josef Land, Novaya Zemlya, Severnaya Zemlya, Southern Andes and Antarctic periphery glaciers between 2010 and 2020.</p>
Outputs of current speed and sea otter abundance models in Glacier Bay, Alaska
<p>Sea otters are apex predators that can exert considerable influence over the nearshore communities they occupy. Since facing near extinction in the early 1900s, sea otters are making a remarkable recovery in Southeast Alaska, particularly in Glacier Bay, the largest protected tidewater glacier fjord in the world. The expansion of sea otters across Glacier Bay offers both a challenge to monitoring and stewardship and an unprecedented opportunity to study the top-down effect of a novel apex predator across a diverse and productive ecosystem. Our goal was to integrate monitoring data across trophic levels, space, and time to quantify and map the predator-prey interaction between sea otters and butter clams <em>(Saxidomus</em> <em>gigantea</em>), one of the dominant large bivalves in Glacier Bay and a favored prey of sea otters. To do so, we developed a modeling framework to account for both bottom-up and top-down drivers of butter clam abundance and dynamics. For the bottom-up driver, we used the root-mean-square current speed (m/s) predicted by a tidal circulation model of Glacier Bay developed by Drew <em>et al. </em>(2013). For top-down sea otter dynamics, we used the posterior mean sea otter abundance estimates from Lu <em>et al. </em>(2019). This repository contains the current speed raster (100m x 100m resolution) produced by Drew <em>et al. </em>(2013) and the files and model output from Lu <em>et al.</em> (2019) necessary to generate a time series of rasters (400m x 400m resolution raster brick with 26 layers for the years 1993-2018) of estimated posterior mean sea otter abundance. These data layers are used in Leach <em>et al. </em>(2023) to model butter clam dynamics at sampling sites across Glacier Bay.</p>
Projected 21st-century mass change for Northern Hemisphere glaciers including frontal ablation
<p>Glacier mass change projections for Nothern Hemisphere glaciers including frontal ablation (2000 to 2100) used in the publication "Exploring the impact of a frontal ablation parameterization on projected 21st-century mass change for Northern Hemisphere glaciers" (doi: 10.1017/jog.2023.19).</p> <p>Generated using a modified version of the Open Global Glacier Model (OGGM, https://github.com/jmalles/oggm/tree/jog23)</p>
Glacier Lake Outburst Flood Database
<p>This dataset is an inventory of globally occurred Glacier Lake Outburst Floods (GLOFs). Our database encompasses data from 769 different sources including satellite and aerial images, reports from local authorities, scientific publications, news outlets, workshop proceedings, social media posts, and unpublished work.</p> <p><strong>Files: </strong><br> <em>glofdatabase_V3.ods</em>: Database spreadsheet (OpenOffice file) containing all reported GLOFs.<br> <em>Parameter_Readme.ods:</em> Readme file describing all database parameters (i.e. columns in glofdatabase_V3.ods) and their units.</p> <p>Our database is an ongoing project and we offer a web-based, interactive map that grants access to the most recent state of the database (<a href="http://glofs.geoecology.uni-potsdam.de/">http://glofs.geoecology.uni-potsdam.de</a>). Users can also download all previous versions of the database from this interface.</p>
Figure Data for "Continuous Estimates of Glacier Mass Balance in High Mountain Asia Based on ICESat-1,2 and GRACE/GRACE Follow-On"
<p>Figure Data for "Continuous Estimates of Glacier Mass Balance in High Mountain Asia Based on ICESat-1,2 and GRACE/GRACE Follow-On" Data" </p>
Datafiles resulting from work at the RG-2 rock glacier in the Uinta Mountains, 2021-2022
<p>Datafiles resulting from work at the RG-2 rock glacier in the Uinta Mountains, 2021-2022</p> <ul> <li>2023JF007453-Table S1 – list of interferograms processed</li> <li>2023JF007453-Table S2 – cosmogenic surface-exposure dating results</li> <li>RG-2 Surveying – RTK-GPS surveying results for 32 points on the rock glacier surface. Used to calculate displacement between September 2021 and September 2022</li> <li>GPR – exported ground penetrating radar survey transects at the head of the rock glacier.Files are provided in .sgv form and the locations of each transect are provided in .kml form</li> <li>UAV – orthophotomosaic and digital elevation model for the RG-2 rock glacier produced from images collected by a drone mapping mission flown on 9/22/2021</li> </ul>
Suspended sediment load and bedload flux from the Glacier d'Otemma proglacial forefield (summers 2020 and 2021)
<p>The Glacier d’Otemma proglacial margin, located in the Swiss Alps at an altitude of about 2450 m a.s.l. (45.93423 N, 7.41160 E), is characterized by a ca. 1 km long by 200 m wide active braided forefield. In this setting we installed two gauging stations for the monitoring of both suspended sediment and bedload transport within the proglacial margin: GS1 at about 350 m from the glacier terminus and GS2 at the forefield outlet.</p> <p>Monitoring stations were equipped with water pressure sensors (CS451 from Cambell Scientific), turbidity probes (OBS300+ from Cambell Scientific) and geophones (3-components PE-6/B from Sensor Nederland connected to a DiGOS DATA-CUBE type 2 logger). Water discharge were determined following modalities described in Müller and Miesen (2022). Suspended loads were quantified using a conventional turbidity-suspended sediment concentration relationship, while bedload transport was derived seismically using the geophysical Fluvial model inversion (FMI) algorithm developed in Dietze et al. (2018). The dataset covers summers 2020 and 2021.</p> <p> Further details on data aquisition and post-processing techniques are available in Mancini et al. (2023).</p>
Modeling ocean heat transport to the grounding lines of Pine Island, Thwaites, Smith, and Kohler glaciers, West Antarctica
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Outputs of current speed and sea otter abundance models in Glacier Bay, Alaska
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Melt rates in the kilometer-size grounding zone of Petermann Glacier, Greenland before and during a retreat
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Postfire tree regeneration in Glacier National Park
Recent increases in fire frequency and severity across the western US are triggering abrupt changes in ecosystem structure and composition, especially in lower montane forests, but consequences of fire-regime change for mesic, mixed-conifer forests remain uncertain. Glacier National Park (Montana, USA) is characterized by a complex mosaic of species typical of Rocky Mountain, Pacific Northwest and boreal floras, creating opportunities for species composition to shift as species respond individualistically to environmental change. We quantified prefire and postfire stem density and composition in a recent anomalously short-interval fire (15 yrs) and historically typical long-interval fire (88-282+ yrs) to answer two questions: (1) How do the structure and composition of tree regeneration differ after long- and short-interval fires that burned in close proximity? (2) What drivers explain differences in postfire regeneration densities among species? We additionally compared understory cover in each fire to anticipate consequences of contemporary fire for the whole plant community. Mean postfire tree seedling density was 45 times higher after the long- than short-interval fire, and many stands in the short-interval fire lacked any tree regeneration. Postfire tree seedling densities were above prefire stem densities in the long-interval fire but well below in the short-interval fire. After both fires, fire-avoiding conifers (e.g., Picea engelmannii, Abies lasiocarpa) were generally replaced by fire-tolerating or fire-embracing species (e.g., Larix occidentalis, Pinus contorta var. latifolia). Some stands remained dominated by fire-sensitive conifers after long-interval fire but never after short-interval fire. Seedlings of Thuja plicata and Tsuga heterophylla were present after the long-interval fire but absent before and after the short-interval fire, despite historically occupying both burned areas. For all species, seedling density increased with indicators of proxima
Subsurface Temperature Data from Seven Rock Glaciers in Rocky Mountain National Park and Niwot Ridge LTER, Colorado, USA, 2018-2019
HOBO temperature-sensing data loggers (hereafter, sensors) were placed under the surface of seven rock glaciers predicted to have the presence (n=4) or absence (n=3) of sub-surface ice in Rocky Mountain National Park and near Niwot Ridge Long-term Ecological Research site in Colorado. Sub-surface temperatures were recorded to evaluate habitat differences among American pika populations. All sensors (model H08 pro, H08, or H02; Onset Computer Corporation, onsetcomp.com) recorded temperature (±0.2° Celsius) every one or two hours for one year starting in September 2018. Each rock glacier received at least one sensor, positioned near the center and near pika sign. Three rock glaciers received an additional sensor positioned near the edge of the rock glacier near pika sign. Sensors were placed at similar depths (~0.75 m) and similar aspects.
McMurdo Dry Valleys Major Ion Concentrations for Glacier Ice, Snow, and Melt Water Samples 1993-1997
The chemistry of various glaciers (Canada, Commonwealth, Howard, Suess, Taylor) in Taylor Valley was measured for the following analytes between 1993 and 1997: Alkalinity, Ca, Cl, F, K, Mg, Na, NO3, Si, and SO4.
McMurdo Dry Valleys Geochemistry data of cryoconite holes collected from Canada, Commonwealth, Howard, Hughes and Taylor glaciers in Nov 2001 and Jan 2002
Geochemistry data of cryoconite holes collected from Canada, Commonwealth, Howard, Hughes and Taylor glaciers in Nov 2001 and Jan 2002
McMurdo Dry Valleys Geochemistry of cryoconite holes collected from Canada Glacier in Jan 2001
The chemistry of cryoconite holes on Canada glacier was measured in January, 2001 at seven locations. Water analysis was conducted for pH, electrical conductivity and a nematodes census.
Geochemical flux on McMurdo Dry Valleys Commonwealth glacier
As part of a geochemical study of the Commonwealth Glacier in Taylor Valley, Antarctica, two 3-meter snow pits were dug in the accumulation zone and analyzed for major ions by ion chromatography. This dataset shows the mean annual atmospheric flux of chloride, sulfate, nitrate, and calcium to the Commonwealth Glacier. Determination of the atmospheric flux of these ions to the glacier surface aids in assessing the chemical composition of precipitation to the McMurdo Dry Valleys and the role of glaciers in the geochemical cycles of the region.
McMurdo Dry Valleys LTER: Nutrient tracer injection experiments in supraglacial streams on Canada Glacier, Antarctica, January 2019
This dataset contains a series of grab samples collected from nutrient tracer injection experiments conducted in supraglacial streams on Canada Glacier in Taylor Valley, Antarctica. The purpose of these experiments was to measure potential nutrient uptake in supraglacial stream networks. We chose three reaches and co-injected nutrient tracer(s) and a conservative tracer (NaCl). Tracers were injected at the top of each reach, allowed to mix with the stream water, and move downstream. Grab samples in this dataset were collected at the base of the reach over the course of these tracer experiments, which ran from 14-19 January 2019.
McMurdo Dry Valleys LTER: Dissolved oxygen measurements in supraglacial streams on Canada Glacier, Antarctica, January 2019
We installed dissolved oxygen sensors in three locations on a supraglacial stream network on Canada Glacier in Taylor Valley, Antarctica in conjunction with a series of nutrient tracer injection experiments. This data collection was intended to provide context for respiration and primary productivity via dissolved oxygen dynamics during our nutrient tracer injections. Sensors were deployed a day before the start of the tracer series and collected on the last day of experiments. Over the course of their deployment, two of the three locations had issues with freezing around the sensor and produced large artifacts (swings) in the data.Â
Spatial coverage and inter-annual persistence of cryoconite holes on Canada and Commonwealth glaciers, McMurdo Dry Valleys, Antarctica (2014-2015)
This data package includes measurements pertaining to the spatial distribution and multi-annual persistence of cryoconite holes on Canada and Commonwealth Glaciers in Taylor Valley, Antarctica during two consecutive austral summers (2013-14 and 2014-15). Four circular sampling zones were established on each glacier and multiple measurements of the surface shape and absolute location of all cryoconite holes within the sampling zones were recorded. These measurements can be used to generate spatial maps and analyze the persistence of cryoconite holes from one summer to the next by tracking individual holes and identifying the number lost, gained, and persistent on a multiannual scale. The physical state of each cryoconite hole (liquid-filled, fully frozen, or drained/dry) was also recorded in order to assess the capacity for drained columns to re-initiate downward melting later in the austral summer or during the following year. The glacial surface coverage (GSC) of liquid-filled cryoconite holes can be used in order to assess the contribution of these columns to total glacial melt and drainage. A detailed description for how to use these data in subsequent analyses to spatially map and ‘track’ cryoconite holes over time is available in Water Resources Research: A.Q. Mass and D.M. McKnight (2021) The inter-annual persistence and contribution of cryoconite holes in Taylor Valley, Antarctica to the hydrologic cycle of the McMurdo Dry Valleys under a new climate regime.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.