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Arctic LTER:  Signature data sets

 

Lake Data

Type of data

Aggregation

Description

Chlorophyll and Primary productivity

Yearly

Total chlorophyll a (mg liter-1) and primary production (mg C m3 d-1). One file per lake per year.

Nutrients

Yearly

Water chemistry data:  NH4+, NO3-, PO4, total dissolved nitrogen, particulate phosphorus, particulate nitrogen, and particulate carbon. One file per lake per year.

Physical and chemical

Yearly

Temperature, oxygen, pH, conductivity, light, cations (Ca2+, Mg2+, Na+, K+), anions (SO42-, Cl-), and alkalinity. One file per lake per year.

Fish

Yearly

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.

Plankton

Yearly

Picoplankton, microplankton and zooplankton data of water column profiles and densities for all lakes sampled in a given year.

Bacteria

Yearly

Bacteria samples taken from Toolik Lake.

Isotopes

Yearly

Isotopic values for carbon and nitrogen in biotic and abiotic samples from several lakes.

Landscape Interactions Data

Type of data

Aggregation

Description

Bacteria Production

Yearly

Bacterial productivity on samples collected at various sites near Toolik Research Station

Chemistry

Yearly

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..

Chlorophyll

Yearly

IChlorophyll a determinations on samples collected at various sites near Toolik Research Station

Discharge

Yearly

Discharge of the tussock watershed weir.

Soils

Multiyear

Biannual thaw depth survey of the watershed.

Lake Climate

Yearly

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

Stream Data

Type of data

Aggregation

Description

Temperature and discharge

Year & stream

Summer temperature and discharge files for each stream.

Nutrients

Year & stream

Weekly concentrations of phosphate, nitrate, and ammonium in each stream and in the Kuparuk and New Reach hyporheic zones.

Primary production

Year & stream

Epilithic chlorophyll a concentrations and the metabolism of epilithic algae and bryophytes in each stream.

Insects

Year, stream & species

Bottom and drift sampling of benthic insects in each stream.

Fish

Year, stream, age

Growth of adult and young-of-the-year Arctic grayling and on long-term tag/recovery of adult and juvenile grayling in each stream

Terrestrial Data

Type of data

Aggregation

Description

Plant Biomass, Chemistry

Year & multiyear

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.

Plant phenological and growth data

Year & multiyear

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.

Soil properties

Year & multiyear

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.

   

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.

Please contact arc_im@mbl.edu with questions, comments, or for technical assistance regarding this web site.