Abstract:
Soil temperature data collected every 4 hours from a wet sedge site at the Arctic Tundra LTER site at Toolik Lake. Temperatures are measured every 3 minutes and averaged every 4 hours in control, nitrogen alone, phosphorus alone, nitrogen and phosphorus, and greenhouse experimental plots soil temperatures.
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Starting in June 1994 weather data has been collected in the wet sedge experimental plots (block 1) at the Arctic Tundra LTER site at Toolik Lake. The treatments included: control, nitrogen alone, phosphorus alone, nitrogen plus phosphorus, shade house and greenhouse. The shade and green houses are only installed June thru August. Air temperature and relative humidity are read every minute and averaged every hour while soil temperatures are read every 3 minutes and averaged every 4 hours. See 1994-1999_Wet_Sedge_Houlry Weather dataset for the Air temperature and relative humidity data. -----------------------------------------------------------------------------------------------------------------------------------------------Sensor and Equipment DescriptionFollowing are brief descriptions of the sensors used. Company addresses follow the list. --------------------------------------------------------------------------------------------------------------------------------------------- Data Logger - Campbell Scientific CR10 Multiplexer - Campbell Scientific AM416 Panel temperature - Campbell Scientific 10TCRT Air temperature/ RH - Campbell Scientific 207; Humidity sensor replaced every 2-3 years. Replaced with CS500 in 2000 Soil Thermocouples - Custom made using Omega Engineering, Copper-Constantan wire. Range -200 to 350 °C. Limits of error: Standard wire 1.0°C or 0.75% above 0°C and 1.0°C or 1.5% below 0°C. Special wire 0.5°C or 0.4%. Campbell Scientific, Inc.81 W. 1800 N.Logan, Utah 84321-1784(435)750-1739 Omega Engineering, Inc. P.O. Box 4047 Stamford, CT 06907-0047 (800)826-6342 ________________________________________________________________________________________ Notes: During the winter of 1994-1995 a program error caused the data from 20Aug94 to 28Mar95 to be lost. Data was also lost during winter 1995-1996. Occasional erratic soil temperature values occur when the air temperature is below -30. This is caused by inaccurate reference temperature at temperatures below -30. Values have not been corrected.
Version Changes:
Log of changes: For Archival Use: DATE RECEIVED: Jun 1996 DATA FILE ENTERED BY: Jim Laundre DATA FILE VALIDATION: NAME: Jim Laundre DATE:
Oct 2015 Combined years 1984 to 2000 in one file. Jim L.
Version 4: Changed Distribution URL since the LTER network DAS system is being discontinued. Jim L 9Apr2015 Move to new web site. 26Feb2016
Version 5: Added data through 2020. Jim L 2022-03-10
Sites sampled.
EML Link:
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 |