Trace Gases

Trace gas data include; Net Ecosystem Production (NEP), Ecosystem Respiration (ER) and methane emissions measured in fertilized, warmed and control plots in 3 tundra types at Toolik Lake, from 1991 to 1993; soil respiration measured in treatment plots in moist acidic and non-acidic tundra in 2000; NEP and ER, plus soil temperature, soil moisture and vegetation descriptions for the ITEX flux survey plots 2003 – 2006.  ITEX data include measurements made at Toolik Lake and Imnavait Creek, at Abisko in northern Sweden, in Adventdalen, Svalbard and in Zackenberg valley, northeast Greenland.

• 1991kntgas - Methane and carbon dioxide emissions were monitored in control, greenhouse, and nitrogen and phosphorus fertilized plots of three different plant communities.

• 1992kntgas - Methane and carbon dioxide emissions were monitored in control, greenhouse, and nitrogen and phosphorus fertilized plots of three different plant communities. This is the second year of collection data.

• 1993kntgas - Methane and carbon dioxide emissions were monitored in control, greenhouse, and nitrogen and phosphorus fertilized plots of three different plant communities. This is the third year of collection data.

• 2000shsoilresp - In situ soil respiration measured in the Arctic LTER treatment plots in moist acidic tussock and moist non-acidic tussock tundra

• 2003-2004gsfluxleafN - Foliar carbon and nitrogen concentrations of the dominant species from within the ITEX flux survey plots 2003-2004. Plots were located in the Toolik Lake LTER moist acidic tussock experiment plots in Alaska; at Imnavait Creek, Alaska.

• 2003-2006gscurveparameters - Ecosystem CO2 flux light response curves were measured on 1m x 1m plots (and some 0.3m x 0.3m plots in 2006) across the arctic. This file contains the best fit parameters that describe these light response curves, together with corresponding NDVI data for each curve. Survey plots were located in the Toolik Lake LTER fertilisation experiment in Alaska; at Imnavait Creek, Alaska; at Paddus, Latnjajaure and the Stepps site near Abisko in northern Sweden; at various sites in Adventdalen, Svalbard; and in Zackenberg Valley, Northeast Greenland. Measurements were made during the growing seasons 2003 to 2006.

• 2003-2006gsflux - Ecosystem CO2 flux light response curves were measured on 1m x 1m plots across the arctic. This file contains the CO2 and H2O flux measurements and NDVI data for each plot. Survey plots were located in the Toolik Lake LTER fertilisation experiment in Alaska; at Imnavait Creek, Alaska; at Paddus, Latnjajaure and the Stepps site near Abisko in northern Sweden; at various sites in Adventdalen, Svalbard; and in Zackenberg valley, Northeast Greenland. Measurements were made during the growing seasons 2003 to 2006.

• 2003-2006gsGPSandveg - GPS locations and vegetation descriptions for the ITEX flux survey plots. Survey plots were located in the Toolik Lake LTER fertilisation experiment in Alaska; at Imnavait Creek, Alaska; at Paddus, Latnjajaure and the Stepps site near Abisko in northern Sweden; at various sites in Adventdalen, Svalbard; and in Zackenberg valley (zone 1a), Northeast Greenland. Data were collected during the growing seasons 2003 to 2006.

• 2003-2006gsharvest - Leaf area, biomass, foliar carbon and nitrogen by species for destructive vegetation harvests. Plots were located in the Toolik Lake LTER fertilisation experiment in Alaska; at Imnavait Creek, Alaska; at Paddus, Latnjajaure and the Stepps site near Abisko in northern Sweden; and at various sites in Adventdalen, Svalbard, and in Zackenberg valley, Northeast Greenland. Harvests were taken during the growing seasons 2003 to 2006.

• 2003-2006gsharvestLAI-N - Leaf area, biomass, foliar carbon and nitrogen by species for destructive vegetation harvests. Plots were located in the Toolik Lake LTER fertilisation experiment in Alaska; at Imnavait Creek, Alaska; at Paddus, Latnjajaure and the Stepps site near Abisko in northern Sweden; and at various sites in Adventdalen, Svalbard, and in Zackenberg valley, Northeast Greenland. Harvests were taken during the growing seasons 2003 to 2006.

• 2003-2006gssoiltemp - Soil temperature, moisture content and thaw depth of the ITEX flux survey plots. Survey plots were located in the Toolik Lake LTER fertilisation experiment in Alaska; at Imnavait Creek, Alaska; at Paddus, Latnjajaure and the Stepps site near Abisko in northern Sweden at various sites in Adventdalen, Svalbard; and in Zackenberg valley, Northeast Greenland. Measurements were made during the growing seasons 2003 to 2006.

• 2003-2006gsspecieslist - A list of plant species encountered during the ITEX flux survey, with their corrresponding 6 letter codes. Research sites were located in the Toolik Lake LTER fertilisation experiment in Alaska; at Imnavait Creek, Alaska; at Paddus, Latnjajaure and the Stepps site near Abisko in northern Sweden; at various sites in Adventdalen, Svalbard; and in Zackenberg valley, Greenland. Measurements were made during the growing seasons 2003 to 2006.

• 2004-2006gscoverft - Estimated aerial plant % cover by functional type in flux plots measured during the ITEX cirumarctic flux survey 2004-2006. Flux plots were located in the Toolik Lake LTER fertilisation experiment in Alaska; at Imnavait Creek, Alaska; at Paddus, Latnjajaure and the Stepps site near Abisko in northern Sweden; at various sites in Adventdalen, Svalbard; and in Zackenberg valley, Northeast Greenland.

• 2004-2006gscoversp - Estimated aerial plant % cover by species in flux plots measured during the ITEX cirumarctic flux survey 2004-2006. Flux plots were located in the Toolik Lake LTER fertilisation experiment in Alaska; at Imnavait Creek, Alaska; at Paddus, Latnjajaure and the Stepps site near Abisko in northern Sweden; at various sites in Adventdalen, Svalbard; and in Zackenberg valley, Northeast Greenland.