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. The 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. Pan evaporations measurements are only made from June through August.
The hourly data are in the file 90DLTLH.DAT, the three hourly data are in 90DLTLO.DAT, and daily summaries are in 90DLTLD.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 90DLTDAT.ZIP which is archived at The Marine Biological Lab, Woods Hole, MA.
Notes: The datalogger stopped collecting data during winter of 1990-91. This file has data from January l through August 25 of 1990. A nearby station, Tussock Station, can be used as a substitute for some of the weather data. See 90DLTUH.DOC.
Log of changes:
26Mar98 Changes 0 hour to 2400 and to correct Julian day for 2400 hour. Updated variable information for date, month, days. JL
22NOV99 Updated documentation. JL
For Archival Use:
DATE RECEIVED: Aug 1990
DATA FILE ENTERED BY: Julie Pallant
DATA FILE VALIDATION:
NAME: Julie Pallant
DATE: 19 Sep 1990
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
Download a comma delimited (csv) or Excel file (includes metadata and data sheets).
Use of the data requires acceptance of the data use policy --> Arctic LTER Data Use Policy
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