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1,337 results for “antarctica”
Data from: Seasonal and diel cycles of fin whale acoustic occurence near Elephant Island, Antarctica
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Data from: Simulated winter warming negatively impacts survival of Antarctica’s only endemic insect
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Data from: High resolution spatial mapping of human footprint across Antarctica and its implications for the strategic conservation of avifauna
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Data from: Ontogeny of the Furongian (late Cambrian) trilobite Proceratopyge cf. P. Lata Whitehouse from northern Victoria Land, Antarctica, and the evolution of metamorphosis in trilobites
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Data from: Brachiopods from the Byrd Group (Cambrian Series 2, Stage 4), Central Transantarctic Mountains, East Antarctica
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Epiphytic diatom community structure and richness is determined by macroalgal host and location in the South Shetland Islands (Antarctica)
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Data from: Halfway encounters: meeting points of colonization routes among the southern beeches Nothofagus pumilio and N. antarctica
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Data from: Image based modelling of lateral magma flow: the Basement Sill, Antarctica
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Data from: Long term marine biodiversity monitoring in coastal Antarctica: Are fewer rare species recruiting?
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Phase-Based Antarctica Ice Velocity Map
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Dataset for: Fast retreat of Pope, Smith, and Kohler glaciers in West Antarctica observed by satellite interferometry
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Data for: Grounding zone of Amery Ice Shelf, Antarctica, from differential synthetic-aperture radar interferometry
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A digital archive of human activity in the McMurdo Dry Valleys, Antarctica from 1902 to present
Over the last half century, the McMurdo Dry Valleys (MDV) of East Antarctica have become a globally important site for scientific research and environmental monitoring. Historical data can make important contributions to current research activities and environmental management in Antarctica, but tend to be widely scattered and difficult to access. We address this need in the MDV by compiling over 5,000 historical photographs, sketches, maps, oral interviews, publications, and other archival resources into an online digital archive. The data have been digitized and georeferenced using a standardized metadata structure, which enables intuitive searches and data discovery via an online interface. The ultimate aim of the archive is to create as comprehensive as possible a record of human activity in the MDV to support ongoing research, management, and conservation efforts. This is a valuable tool for scientists seeking to understand the dynamics of change in lakes, glaciers, and other physical systems, as well as humanistic inquire into the history of the Southern continent. In addition to providing benchmarks for understanding change over time, the data can help target field sampling for studies working under the assumption of a pristine landscape by enabling researchers to identify the date and extent of past human activities. The full database is accessible via the McMurdo Dry Valleys Long Term Ecological Research site: http://mcmurdohistory.lternet.edu/.
Particulate organic carbon and nitrogen measurements from Go-Flo bottles sampling the water column from a zodiac during Palmer LTER station seasons at Palmer Station Antarctica, 1991 - 2012.
All organisms are composed of organic matter. Organic matter is synthesized from dissolved inorganic carbon (dissolved CO2) and inorganic nutrients by phytoplankton photosynthesis, and consumed (oxidized) by respiration by heterotrophs (zooplankton and bacteria). The organic matter in seawater is a variable mixture of dissolved and particulate organic matter (DOM and POM). Typically DOM predominates over POM by an order of magnitude, but the relative amount of POM can be highly enhanced during large phytoplankton blooms. The principal elemental components of POM include organic carbon (POC), organic nitrogen (PN), there is no particulate inorganic N) and phosphorus (POP). These elements exist in a relatively stable, characteristic ratio of 106:6:1 (C:N:P) in seawater, known as the Redfield Ratio. Marine particulate matter is a complex mixture of live and dead plankton and detritus, and of carbohydrates, proteins, lipids and nucleic acids. POC and PN are enhanced in the euphoric zone, reflecting their origin by photosynthesis. The particulate pool is also a complex assemblage of particles of different sizes, shapes and densities. A simplified scheme divides the particles into large, rapidly sinking particles (10s - 100s of meters per day) and smaller, suspended particles. The transition between small particles and dissolved organic matter is typically specified by filtration through GF/F filters. POC and PN are analyzed for all samples in the upper 50 meters at Palmer Station B (75 m depth) and the upper 65 m at Station E (200 m depth). There is a gradient of POM from higher values inshore to much lower values in deep ocean water beyond the continental shelf break (sampled on the annual cruise).
2-minute PALMOS automatic weather station meteorological measurements (precipitation, radiation, cloud base, temperature, etc.) from Palmer Station Antarctica, 2001 - March 2017.
Automated weather observation station at Palmer Station Antarctica using Coastal Environment sensors. Started recording in November 2001. Overlapped for two years with manual observations. In December 2003, the PalMOS automated report generator was brought online and the manual observations discontinued. The sole manual observation remaining is the daily snow-level and new snow level measurements.
Shell lengths of pteropod, Limacina helicina antarctica, collected from the PAL LTER sediment trap along the Western Antarctic Peninsula, 2004 - 2018, and from net tows 2017-2018.
Pteropod, Limacina helicina antarctica, is an abundant zooplankton along the Western Antarctic Peninsula (WAP) and prey for higher trophic organisms. Changes in the pteropod (pelagic snail) phenology (life history) have important implications for regional food web dynamics. Pteropod shell lengths were collected from the PAL LTER sediment trap located along the northern continental shelf of the PAL LTER sampling grid, 2004-2018. PAL LTER has deployed a time-series trap near 64.5° S, 66.0° W since late 1992. The trap is moored in 300 m depth and collects sinking particles at 170 m. Pteropod samples are stored in 21 sample collection bottles on the sediment trap that were prepared with a Milli-Q deionized water rinse and filled with 7.5 g NaCl l-1 solution and 2% borate-buffered formalin in filtered seawater (34 ppt), with a final salinity concentration of 41 ppt. L. h. antarctica shell lengths also collected during the PAL LTER 2018 January offshore cruise and for four months at Palmer Station, Anvers Island (November 2017 to February 2018). L. h. antarctica and all other macrozooplankton collection on the PAL LTER cruise are performed with a 2 m square frame Metro net (700 µm mesh), towed obliquely to a depth of 120 m. At Palmer Station, pteropods are collected with a 1 m x 1 m square frame Metro net (700 µm mesh) and a 1 m diameter ring net (200 or 500 µm mesh), towed obliquely to a depth of ~50 m. Shell lengths are determined by measuring from the opening of the shell aperture directly across the diameter of the shell. The shell lengths analyzed within the WAP region are used to determine phenology patterns in pteropod population dynamics and changes thereof over time.
Bacterial properties in discrete water column samples collected during Palmer LTER station seasons at Palmer Station Antarctica, 2002 - 2019.
The microbial biogeochemistry component of PAL focuses on marine bacterioplankton, and is thus a counterpart to the phytoplankton and zooplankton components, which together provide a detailed and comprehensive description of plankton ecology in PAL-LTER. Bacteria and Archaea (hereafter called "bacteria") are taxonomically and metabolically diverse. In coastal and offshore surface waters Bacteria generally predominate over Archaea, but Archaea are equal or greater in abundance in the mesopelagic layer below the euphoric zone. We focus on aerobic, heterotrophic bacteria in the upper 65 m at Palmer Station which oxidize recently-produced low molecular weight dissolved organic compounds released by phytoplankton and zooplankton, decomposing them back into CO2 and inorganic nutrients. Globally, marine bacteria respire an amount of carbon roughly equal to about half the daily photosynthetic production. In cold polar waters, relative bacterial activity is lower, with bacterial biomass production being equal to <5% of the daily photosynthesis. The ratio at lower latitudes is 10-20%. The factors responsible for this contrast are not entirely clear. Resolving this pattern is a key aim of the PAL microbial component. At Palmer Station, bacterial production is low (< 10 mgC/m2/d) in the winter (polar night) when there is little if any photosynthesis. There is a climatological (2003-14 average) summer peak of 50-60 mgC/m2/d in January-February but with considerable seasonal and annual variability. The 2016/2017 season data contains bacteria abundances for preserved samples for comparison to abundances from live samples. See the documentation for this in the accompanying file, 2016_live_vs_preserved.pdf.
Bacterial properties in discrete water column samples at selected depths, collected aboard Palmer LTER annual cruises off the coast of the Western Antarctica Peninsula, 2003 - 2019.
The microbial biogeochemistry component of PAL focuses on marine bacterioplankton, and is thus a counterpart to the phytoplankton and zooplankton components, which together provide a detailed and comprehensive description of plankton ecology in PAL-LTER. Bacteria and Archaea (hereafter called "bacteria") are taxonomically and metabolically diverse. In coastal and offshore surface waters Bacteria generally predominate over Archaea, but Archaea are equal or greater in abundance in the mesopelagic layer below the euphoric zone. We focus on aerobic, heterotrophic bacteria in the upper 100 m on the annual summer cruise. These bacteria oxidize recently-produced low molecular weight dissolved organic compounds released by phytoplankton and zooplankton, decomposing them back into CO2 and inorganic nutrients. Globally, marine bacteria respire an amount of carbon roughly equal to about half the daily photosynthetic production. In cold polar waters, relative bacterial activity is lower, with bacterial biomass production being equal to <5% of the daily photosynthesis. The ratio at lower latitudes is 10-20%. The factors responsible for this contrast are not entirely clear. Resolving this pattern is a key aim of the PAL microbial component. Bacterial production is generally low across the grid, relative to primary production, but with considerable spatial and annual variability. Discrete BP can reach >200mgC/m2/d following bloom-fueled high organic matter events. Across the grid and over years, BP is highly correlated with chlorophyll, highlighting the close relationship with phytoplanktonic organic matter production.
Datasets of UV irradiance, visible and photosynthetically active radiation in Marambio, Antarctica from March 2017 to May 2019
<p>GUV radiometer data from Marambio station for the period March 2017 - May 2019. UV-B and UV-A daily maximum irradiances and dailydoses. Daily noon UV index and total column ozone. Daily maximum irradiances at 555 nm (VIS) and daily maximum of photosynthetically active radiation.</p> <p>If you use the data, please contact Kaisa Lakkala, Finnish Meteorological Institute.</p>
Fig. 1. A. Antarctic Continent. B in Two new species of Colletteidae (Crustacea: Tanaidacea: Tanaidomorpha) from Bransfield Strait, Antarctica
Fig. 1. A. Antarctic Continent. B. South Shetland Islands, King George Island (Admiralty Bay) and Bransfield Strait highlighted. C. Sampling sites in Bransfield Strait. (Source: Google Earth.)
ScienceDex guides
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These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
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.