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  1. ; ; (, Environmental Data Initiative)
    One-minute averages of air temperature and relative humidity, soil temperature and moisture, and solar radiation from 2017 to 2025 for the former Arctic LTER Toolik wet sedge eddy covariance flux site. This site was originally set up for seasonal eddy covariance flux measurements during the summers of 2010–2015 and partially during winters starting in 2014, until 15 June 2016. Flux data are reported in Eugster et al.(2020)(doi:10.5194/amt-2019-402). IMPORTANT NOTE: The data has only been checked for obvious outliers. Use with caution since most of the data has not been carefully checked. It was decided to release this version instead of waiting until there were resources for a complete check. 
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  2. ; (, Environmental Data Initiative)
    Whole plant biomass totals and root biomass (partitioned by percent of total leaf area) for species, tissue type, and functional group for the Arctic LTER experimental 1981 mesic acidic tussock tundra (MAT81) for the 2000 and 2015 harvests. Because most of the root biomass could not be identified to species in either 2000 or 2015, the calculation of root biomass and element content for roots not identified to species was estimated by the proportion of those species’ contributions to total leaf area. Specific Leaf Area (SLA = leaf area per gram leaf, centimeter squared per gram) values were available from several previous harvests of this experiment; in the present study, we used measurements from the 1995 harvest (Shaver et al. 2001). 
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  3. ; (, Environmental Data Initiative)
    Plant and root biomass, nitrogen, carbon, and phosphorus were measured in 2015 in the Arctic LTER tussock tundra experimental site (MAT81). This site was established in 1981 and has been harvested in previous years (see Shaver and Chapin Ecological Monographs, 61(1), 1991, pp.1-31, https://doi.org/10.2307/1942997). Data tables include the biomass for each harvested quadrat and block summaries for percent carbon, nitrogen, and phosphorus for control and fertilized plots from the original 4-block design. New control plots, established in 2015, are in a separate data table and include biomass, percent carbon, nitrogen, and phosphorus for each quadrat. 
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  4. ; (, Environmental Data Initiative)
    A complete accounting of biomass, C, N, and P allocation both among tissue types (leaves, stems, rhizomes, roots) and among species and plant functional types from Arctic LTER 1981 Moist Acidic Tussock (MAT81) long-term experiment’s untreated control plots and plots that were fertilized annually, harvested after 20 and 35 years, near Toolik Lake Field Station, Alaska. Data are gram per meter squared summarized by block. 
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  5. ; ; ; ; ; ; ; ; ; (, NSF Arctic Data Center)
    Weather data has been collected at Toolik Field Station (68 degrees 38'N, 149 degrees 36'W) since June 1988. The weather station located at the field station was originally installed by the Arctic Long Term Ecological Research (LTER) (ecosystems.mbl.edu/arc) and Toolik Field Station (TFS) assumed control of the station in 2007. The field station is an ideal location for maintaining long-term weather data, as it is located in a data sparse region and adds a data point along the north-south transect of the North Slope of Alaska, following along the Dalton Highway. There is year round access and a long-term pre-existing dataset. These advantages make it possible to provide quality data - an often difficult achievement in remote northern latitudes in Alaska. 
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  6. ; ; ; ; ; ; ; ; ; (, NSF Arctic Data Center)
    Weather data has been collected at Toolik Field Station (68 degrees 38'N, 149 degrees 36'W) since June 1988. The weather station located at the field station was originally installed by the Arctic Long Term Ecological Research (LTER) (ecosystems.mbl.edu/arc) and Toolik Field Station (TFS) assumed control of the station in 2007. The field station is an ideal location for maintaining long-term weather data, as it is located in a data sparse region and adds a data point along the north-south transect of the North Slope of Alaska, following along the Dalton Highway. There is year round access and a long-term pre-existing dataset. These advantages make it possible to provide quality data - an often difficult achievement in remote northern latitudes in Alaska. 
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  7. ; ; ; ; ; ; ; ; ; (, NSF Arctic Data Center)
    Weather data has been collected at Toolik Field Station (68 degrees 38'N, 149 degrees 36'W) since June 1988. The weather station located at the field station was originally installed by the Arctic Long Term Ecological Research (LTER) (ecosystems.mbl.edu/arc) and Toolik Field Station (TFS) assumed control of the station in 2007. The field station is an ideal location for maintaining long-term weather data, as it is located in a data sparse region and adds a data point along the north-south transect of the North Slope of Alaska, following along the Dalton Highway. There is year round access and a long-term pre-existing dataset. These advantages make it possible to provide quality data - an often difficult achievement in remote northern latitudes in Alaska. 
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  8. ; ; ; ; ; ; ; ; ; (, NSF Arctic Data Center)
    Weather data has been collected at Toolik Field Station (68 degrees 38'N, 149 degrees 36'W) since June 1988. The weather station located at the field station was originally installed by the Arctic Long Term Ecological Research (LTER) (ecosystems.mbl.edu/arc) and Toolik Field Station (TFS) assumed control of the station in 2007. The field station is an ideal location for maintaining long-term weather data, as it is located in a data sparse region and adds a data point along the north-south transect of the North Slope of Alaska, following along the Dalton Highway. There is year round access and a long-term pre-existing dataset. These advantages make it possible to provide quality data - an often difficult achievement in remote northern latitudes in Alaska. 
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  9. ; (, Environmental Data Initiative)
    Air temperature and relative humidity at 3 meters, soil temperatures at 2 depths, 5 and 10 cm, canopy temperatures and soil moisture at 10 cm were measured in an Arctic Long Term Experimental Research (ARC-LTER) heath tundra site (DHT89) at Toolik Lake Field Station, North slope, Alaska. Only control and nutrient addition (nitrogen plus phosphorus ) treatments plots soils were measured. Note: In version 1 the moisture columns were mixed up. The fractional volumetric water columns were actually the period frequency of the wave of the sensor (Campbell Scientific CS616). Version 3 adds calculated percent moisture corrected for organic soil. 
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