Daily weather data file for Arctic Tundra LTER site at Toolik Lake. Included are daily averages and/or maximums
and minimums of air, soil and lake temperature, wind speed, vapor pressure, and sum of global radiation and unfrozen precipitation recorded near Toolik Lake.
Data set ID:
EML revision ID:
Weather data have been collected at Toolik Lake (68 degrees 38'N, 149 degrees 36'W) by a Campbell 21x datatlogger 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 92DLTLH.DAT, the three hourly data are in 92DLTLO.DAT, and daily summaries are in 92DLTLD.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 92DLTDAT.ZIP which is archived at The Marine Biological Lab, Woods Hole, MA.
Notes: Wind speed less than .447 is considered calm. Data is missing for the following periods:
92160 to 92175 - Data not saved before changing memory allocations in logger.
92189 to 92248 - Data logger not set in logging mode after trying to fix the lake quantum sensor.
92174 TO 92366 - AIR TC 1M is not working.
Missing data for air temperature and rain were estimated when possible. For small gaps the in the hourly data before and after were averaged. For larger gaps regressions were made with the either Toolik Tussock site or Imnaviat data set (a weather station maintained by Hinzman and Kane, Water Research Center, University of Alaska Fairbanks, Fairbanks, AK 99775-5860, which is about 12 kilometers to the east and 200 meters higher).
Log of changes:
14Sept94 Added the rest of the end of year data and updated the documentation file. Jim Laundre.
For Archival Use:
DATE RECEIVED: June 1991
DATA FILE ENTERED BY: Jim Laundre
DATA FILE VALIDATION:
20 September 1994
Version 2: 13Sept06 Created excel metadatasheet inculded attributes. Jim L
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