Daily weather data file for Arctic Tundra LTER site at Toolik Lake, Arctic LTER 1998.


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.

Project Keywords: 

Data set ID: 


EML revision ID: 

Published on EDI/LTER Data Portal


Shaver, G. 2000. Daily weather data file for Arctic Tundra LTER site at Toolik Lake, Arctic LTER 1998. Environmental Data Initiative. http://dx.doi.org/10.6073/pasta/5af19f6f0b75650b4fff8e46ba8ccdcd



Additional People: 

Associated Researcher

Date Range: 

Friday, May 1, 1998 to Tuesday, September 1, 1998

Publication Date: 



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, 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 98DLTLH.DAT, the three hourly data are in 98DLTLO.DAT, and daily summaries are in 98DLTLD.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 98DLTDAT.ZIP, which is archived at The Marine Biological Lab, Woods Hole, MA.

Notes: Wind speed less than .447 is considered calm .
Radiation data were not totaled for the winter months since no attempt was made to keep sensors snow and frost free. Lake temperature is measured near the lake depth sensor. Therefore the lake depth measurements give the depth at which lake temperature is measured. Maximum and minimum values are from minute readings and not from hourly averages except for TC 5M min which is from hourly averages.

Sampling Description.

Daily average of the following hourly calculation.
If Air Temp > 0 then (RH 5M/100) * 6.1121 * exp(17.368 * AIR TEMP 5M/(238.88 + AIR TEMP 5M))
If Air Temp < 0 then (RH 5M/100) * 6.1121 * exp(17.966 * AIR TEMP 5M/(238.88 + AIR TEMP 5M))
(Buck 1981).
PYR J CM2 : Daily sum of PYRANOMETER * 0.3600 jcm2 * 1000 Watt/Kwatt
QUANTUM Mol/m2: (Daily sum of Quantum)*60sec*60 min* 10^-6 umol/mol

Version Changes: 

Log of changes:

17Jun99 Added winter data and error checked. JL
Did more QAC. Checked for differences between hourly data averaged daily agains the logger's daily value. When changing a logger's program the intermediate values are lost which then gives a wrong daily values. 15JUL99 JL

For Archival Use:

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

Sites sampled.

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