Daily summary of 10 cm soil temperatures in the Arctic LTER moist acidic experimental plots for the control (CT), greenhouse (GH), greenhouse plus nitrogen and phosphorus (GHNP) and nitrogen and phosphorus (NP) plots. Soil temperature probes in the tundra soil were problematic with frost heaving causing the depth of measurements to change. In order to provide a consistent year to year temperature record notes on changes in depths were used to select the temperature sensor that was within + or – 3 cm of the 10 cm and then averaged daily.
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A Campbell 21x data logger in the Arctic LTER moist acidic experimental plots (block 2) is used to monitor weather and soil temperatures. Two profiles of soil temperature are measured per treatment plot with copper/constantan thermocouple wires (TC) installed at depths of 10, 20, and 40 cm in inter-tussock areas. The following label codes are used: CT = control, GH = greenhouses, SH = shade houses, NP = fertilized, GNP= greenhouse fertilized, SNP = shade house fertilized, plus a 1 or a 2 for the profile number. All soil sensors are read every 15 minutes and averaged every 3 hours. Other sensors include: global solar radiation, photosynthetic active radiation, unfrozen precipitation, air temperature, relative humidity, wind speed, and wind direction at 3 meters.
The fertilizer treatment is applied every year in early June at the rate of 10 gram per meter nitrogen and 5 grams per meter as phosphorus using commercial grade fertilizers, i.e. 34 - 0 – 0 equal 34% nitrogen and 0 - 45 - 0 equals 45% P2O5 (19.89%P). The greenhouse covers are removed every fall around 20 August and reinstalled every spring in early June.
This file is includes only a daily summary of the 10 cm soil temperature for the control (CT), greenhouse (GH), greenhouse plus nitrogen and phosphorus (GHNP) and nitrogen and phosphorus (NP) plots.
Soil temperature probes were problematic since frost heaving of the probes caused depth of measurements to change. Most of the depth changes seem to occur it spring. In August 1998 all profiles were reset using a white fiberglass pole anchored approximately 75 cm into the permafrost. Some probes stilled heaved. In order to provide a consistent year to year temperature record notes on changes in depths were used to select the temperature sensor that was within + or – 3 cm of the 10 cm. The probe used is noted in the “rep used” variable. In some cases there was no suitable sensor probe.
Only data from August 1998 to present are used since the previous profiles included one rep each in a tussock and non-tussock micro-site. In addition there are incomplete notes on the movement of the probes.
Data updated yearly
Jan2006 completed metadata and data up to aug2005. JimL
Version 2: Upadte LTERNET Data Access server proxy link for Excel and comma delimited data files. Changed from knb to das in url.
Version 3: Metadata updated to newer form (with sites sheet). CH April 2013.
Version 4: Changed Distrubution URL since the LTER network DAS system is being discontinued. JimL 9Apr2015