Weather data file for Arctic Tundra LTER site at Toolik Lake. Only the sensors that are measured every 10 minutes and averaged every three hours are include, i.e. soil temperatures, lake temperature, lake depth, and evaporation pan depth and pan water temperature.
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Weather data has been collected at Toolik Lake (68 degrees 38'N, 149 degrees 36'W) by a Campbell 21x datalogger since June 1988. Sensors that are measured every minute and averaged or totaled every hour include: air temperature and relative humidity at 1 and 5 meters, wind speed at 1 and 5 meters, wind direction at 5 meters, global solar radiation, photosynthetically active radiation, net radiation (Fritschen type), barometric pressure, and unfrozen precipitation. Sensors measured every 10 minutes and averaged every three hours include: soil temperatures, lake temperature, lake depth, and evaporation pan depth and pan water temperature. Net radiation and pan evaporation are only measured during the summer months. Lake temperature and depth sensors are located about 4 meters offshore on a short pipe imbedded in the lake bottom. Therefore lake temperature is measured at whatever depth the lake depth sensor indicates. Both sensors are about 20 cm from the lake bottom. Soil temperatures consist of two profiles in a moss dominated plant community. They are within 3 meters of the weather station.
The hourly data are in the file 94DLTLH.DAT, the three hourly data are in 94DLTLO.DAT, and daily summaries are in 94DLTLD.DAT. A second Campbell 21x datalogger about 700 meters from the main weather station logs air and soil temperatures and photosynthetically active radiation in the experimental treatment plots. Treatments include greenhouse, shading, and fertilization. In the control plot wind speed and direction, global solar radiation and unfrozen precipitation are also measured. This station is also used as a backup to the main weather station. The full description of the sensors and site is in file SENSORS.DOC. The original data is in file 94DLTDAT.ZIP which is archived at The Marine Biological Lab, Woods Hole, MA.
Notes: Lake temperature is measured where the lake depth measurement is made. Soil temperatures consist of two profiles in a moss dominated plant community. They are within 3 meters of the weather station. Pan evaporation measurements are only made from June through August.
Log of changes:
27Sept95 Added winter data. JL
14JUL99 Added year variable and full year to date. JL
6Dec99 Changed variable names to the unified names and order. JL
For Archival Use:
DATE RECEIVED: Sept 1994 and Sept 1995
DATA FILE ENTERED BY: Jim Laundre
DATA FILE VALIDATION:
NAME: Jim Laundre
DATE: 13 Oct 1994, 27 Sept 1995
Version 3: Metadata updated to newer form (with sites sheet). Units updated to current standards. Discrepancy with variable names fixed. CH April 2013.
Version 4: Corrected Distrubution URL. It had xlsfiles in the path. Jim L 19Jun14
Version 5: Changed Distrubution URL since the LTER network DAS system is being discontinued. JimL 9Apr2015
Full Metadata and data files (either comma delimited (csv) or Excel) - Environmental Data Initiative repository.
Use of the data requires acceptance of the data use policy --> Arctic LTER Data Use Policy