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 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. The hourly data are in the file 97DLTLH.DAT, the three hourly data are in 97DLTLO.DAT, and daily summaries are in 97DLTLD.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 97DLTDAT.ZIP, which is archived at The Marine Biological Lab, Woods Hole, MA.
Notes: Lake temperature is measured near the lake depth sensor. Therefore the lake depth measurements give the depth at which lake temperature is measured. Toolik stage height is lake surface to the depth of the sensor which is mounted on the near-shore bottom at approximately 2 meters depth. Soil temperatures consist of two profiles in a moss dominated plant community. They are within 3 meters of the weather station. Lake and the 50 and 100 cm soil thermocouples stopped working during the winter of 1996 because of a loose wire. Late August soil profile #1 at 50 and 100 cm could not be reset. They were put in at 20 cm shallower. See SOIL1 30CM and SOIL1 80CM. Pan evaporations measurements are only made from June through August. Data was lost from 168 to 176 when logger memory filled.
Log of changes:
6Dec99 Updated date and year to four digits. Changed variable names to the unified names and order. JL
For Archival Use:
DATE RECEIVED: August 1997, June 1998
DATA FILE ENTERED BY: Jim Laundre
DATA FILE VALIDATION:
NAME: Jim Laundre
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