Arctic LTER: Datasets available on-line.
The long-term data sets of the Arctic LTER include both the monitoring data and data from the
whole ecosystem manipulations in tundra, lakes and streams. Data can be browse by research theme or project and by the five
LTER Network core research areas.
For LTER wide datasets see
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Type of data
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Aggregation
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Description
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Circumpolar Geobotanical Atlas
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The Circumpolar Arctic Geobotanical Atlas is a web-based multi-scale collection of geobotanical maps and related material. It includes maps at eight different scales, from 1-mē plots to the entire Arctic. Much of the early work was done by Donald (Skip) Walker (Alaska Geobotany Center, University of Alaska, Fairbanks, AK) and others at Toolik Lake and Imnavait Creek.
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Arctic System Science (ARCSS
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Many of the Geobotanical's maps are available as ARC/INFO files through a link to the Arctic System Science (ARCSS) Data Coordination Center.
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Toolik Field Station GIS
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The Toolik Field Station GIS was developed with support from NSF-Office of Polar Programs to help manage and support research based at the Field Station including LTER research.
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Satellite images
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The LTER Network Office has acquired Satellite images of the Toolik area. These images are available and include landsat and SPOT images.
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Type of data
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Aggregation
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Description
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Chlorophyll and Primary productivity
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Year & lake
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Total chlorophyll a (mg liter-1) and primary production (mg C m3 d-1). One file per lake per year.
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Nutrients
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Year & lake
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Water chemistry data: NH4+, NO3-, PO4, total dissolved nitrogen, particulate phosphorus, particulate nitrogen, and particulate carbon. One file per lake per year.
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Physical and chemical
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Year & lake
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Temperature, oxygen, pH, conductivity, light, cations (Ca2+, Mg2+, Na+, K+), anions (SO42-, Cl-), and alkalinity. One file per lake per year.
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Fish
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Year & Lake
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Fish number, recapture number, species, lengths and weights of lake trout (Salvelinus namaycush), arctic grayling (Thymallus arcticus), round whitefish (Prosopium cylindraceum) burbot (Lota lota) and arctic char (Salvelinus alpinus ). One file per lake sampled per year.
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Plankton
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Year
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Picoplankton, microplankton and zooplankton data of water column profiles and densities for all lakes sampled in a given year.
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Bacteria
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Year
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Bacteria samples taken from Toolik Lake.
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Isotopes
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Year
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Isotopic values for carbon and nitrogen in biotic and abiotic samples from several lakes.
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Type of data
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Aggregation
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Description
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Bacteria Production
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Yearly
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Bacterial productivity on samples collected at various sites near Toolik Research Station
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Chemistry
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Yearly
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Include temperature, pH, conductivity, dissolved gases (CO2 and CH4), dissolved organic and inorganic carbon (DOC and DIC), alkalinity, inorganic and total dissolved nutrients (NH4, PO4, TDN, TDP), particulate organic nitrogen and carbon (PON and POC), CHla, and ions..
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Chlorophyll
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Yearly
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IChlorophyll a determinations on samples collected at various sites near Toolik Research Station
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Discharge
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Yearly
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Discharge of the tussock watershed weir.
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Soils
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Multiyear
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Biannual thaw depth survey of the watersheds.
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Lake Climate
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Yearly
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Wind speed and direction, air temperature, and humidity for lakes E5 and Toolik. Toolik lake station also measures net long wave and short wave radiation
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Root Dynamics
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Yearly
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NSF-OPP "Root Dynamics" Project Database
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Type of data
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Aggregation
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Description
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General Ecosystem Model (MBL-GEM)
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Multiyear
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MBL-GEM is a process-based model of C-N interactions in terrestrial ecosystems. The model is intended to be generally applicable to most terrestrial ecosystems and, in its original form, has been used to analyze the responses of temperate deciduous forests, tropical evergreen forests, and arctic tundra to changes in CO2 concentration, temperature, N inputs, irradiance, and soil moisture.
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Type of data
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Aggregation
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Description
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Temperature and discharge
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Year & stream
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Summer temperature and discharge files for each stream.
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Nutrients
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Year & stream
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Weekly concentrations of phosphate, nitrate, and ammonium in each stream and in the Kuparuk and New Reach hyporheic zones.
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Primary production
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Year & stream
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Epilithic chlorophyll a concentrations and the metabolism of epilithic algae and bryophytes in each stream.
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Insects
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Year, stream & species
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Bottom and drift sampling of benthic insects in each stream.
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Fish
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Year, stream, age
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Growth of adult and young-of-the-year Arctic grayling and on long-term tag/recovery of adult and juvenile grayling in each stream
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Type of data
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Aggregation
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Description
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Plant Biomass, Chemistry
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Year & multiyear
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Biomass harvests; includes several tundra types (heath, wet sedge, acidic and non acidic mesic tussock, shrub), treated and untreated plots and woody stem biomass. Percent carbon, nitrogen, phosphorus, leaf area, stem biomass and carbon flux were also measured for several of the harvests.
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Plant species list
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Multiyear
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Plant lists from biomass harvests and from permanent plots.
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Plant phenological and growth data
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Year & multiyear
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Leaf growth and phenology data from experimental plots from northern and central Alaska. Eriophorum vaginatum flowering abundance data are from observations at 34 sites, spanning 5.5 degrees latitude and 1050 m elevation.
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Soil del C-13; Radiocarbon dates
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Separated by year and sites
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Percent moisture, percent organic carbon, bulk density, del C-13, del 15N, and radiocarbon content at depth intervals in peat cores from the North Slope of Alaska.
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Soil properties
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Year & multiyear
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Extractable NH4-N, NO3-N and PO4-P, pH, total carbon, nitrogen and phosphorus and thaw depth on soils of the experimental plots near Toolik.
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Trace gas
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Year
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Ecosystem respiration (ER: or CO2 flux), methane (CH4) fluxes and net ecosystem production (NEP) near Toolik Lake, Alaska. ITEX flux survey from plots near Toolik Lake LTER, Alaska, Abisko in northern Sweden; and Adventdalen, Svalbard.
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Litter Decomposition
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Multiyear
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Long-term Intersite Decomposition Experiment Team (LIDET) data set for Toolik.
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Precipitation Chemistry
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Multiyear
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Unfrozen wet only and bulk precipitation chemistry for summer months at Toolik Lake.
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Type of data
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Aggregation
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Description
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Toolik Main Weather station
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Yearly & multiyear
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Air temperature, relative humidity, wind speed and direction, solar radiation, precipitation, barometric pressure, soil temperatures, lake temperature, lake depth, and evaporation pan measured at Toolik Lake since June 1988.
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Plot level Weather Stations
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Yearly
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Soil and air temperatures in mesic acidic tussock, mesic non-acidic tussock and wet sedge experimental tundra sites.
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Sagavanirktok River
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Yearly & multiyear
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Soil, air temperature, solar radiation and summer precipitation collected 40 km north of Toolik.
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