Arctic LTER:
Signature data sets
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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 watershed.
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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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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 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 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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