ARCTIC LTER DATABASE (1) FILE NAME: 98DLTLO (2) YEAR: 1998 (3) PI: GUS SHAVER (4) OTHERS: JIM LAUNDRE (5) BRIEF DESCRIPTION OF DATA FILE: Weather data file for Arctic Tundra LTER site at Toolik Lake. Only sensors measured every 10 minutes and averaged every three hours are include in this file, i.e. soil temperatures, lake temperature, lake depth, and evaporation pan depth and pan water temperature. (6) KEYWORDS: soil temperature, lake temperature, lake depth, evaporation pan, weather (7) SITE TYPE: TERRESTRIAL (8) RESEARCH LOCATION: University of Alaska Fairbanks Toolik Field Station, North Slope of Alaska (68 degrees 38'N, 149 degrees 36'W). (9) EXPERIMENTAL DESIGN AND METHODS: 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 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 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 (10) NOTES AND COMMENTS: Lake temperature is measured near the lake depth sensor. Therefore the lake depth measurements give the depth at which lake temperature is measured. Toolik lake depth is lake surface to the depth of the sensor which is mounted on the near-shore bottom at approximately 2 meters depth. June into August the lake depth sensor became erratic. It was replace August 7th but in late December it stopped working. Soil temperatures consist of two profiles in a moss dominated plant community. They are within 3 meters of the weather station. Late August 1997 soil profile #1 at 50 and 100 cm could not be reset. They were put in at 20 cm shallower. In August 1998 soil profiles were reset on a white fiberglass rod and 5, 10, 150 cm depths added. Pan evaporation measurements are only made from June through August. (11) VARIABLE DESCRIPTION: NOTE: All missing values are indicated by #N/A Variable Variable description Units YEAR Year in yyyy DATE: Date dd-mmm-yyyy MONTH Month of collection DAYS Julian plus fraction of day. ID Datalogger program step JULIAN: Julian Date ddd HOUR: Time - Alaska standard time 2400 BATTERY: Battery voltage of datalogger Volts LAKE DEPTH: Toolik lake depth cm EVAPO DEPTH: Evaporation Pan depth mm EVAPO TEMP Evaporation pan water temp Celsius SOIL1 MOSS: Soil profile 1 moss temp Celsius SOIL1 5CM: Soil profile 1 temperature 10 cm Celsius SOIL1 10CM: Soil profile 1 temperature 20 cm Celsius SOIL1 20CM: Soil profile 1 temperature 20 cm Celsius SOIL1 50CM: Soil profile 1 temperature 50 cm Celsius SOIL1 100CM: Soil profile 1 temperature 100cm Celsius SOIL1 150CM: Soil profile 1 temperature 150cm Celsius SOIL2 MOSS: Soil profile 2 moss temperature Celsius SOIL2 5CM: Soil profile 2 temperature 10 cm Celsius SOIL2 10CM: Soil profile 2 temperature 20 cm Celsius SOIL2 20CM: Soil profile 2 temperature 20 cm Celsius SOIL2 50CM: Soil profile 2 temperature 50 cm Celsius SOIL2 100CM: Soil profile 2 temperature 100cm Celsius SOIL2 150CM: Soil profile 2 temperature 150cm Celsius LAKE TEMP: Lake Temp at LAKE DEPTH Celsius COMMENTS: Notes on data. (12) CALCULATIONS Variable Formula (13) FOR MORE INFORMATION, CONTACT: Jim Laundre or Gus Shaver Marine Biological Laboratory The Ecosystems Center Woods Hole, MA 02543 (508) 548-3705 (14) OTHER DATA FILES TO REFERENCE: 89DLTLO, 90DLTLO, 91DLTLO, 92DLTLO, 93DLTLO, 94DLTLO, 95DLTLO, 96DLTLO, 97DLTLO (15) REFERENCE CITATIONS: (16) FORMAT OF VARIABLES: File Name: 98DLTLO.DAT File type: Comma delimited (17) NUMBER OF RECORDS: RECORDS (18) STATUS: Type 1 ========================================= (19) FOR ARCHIVAL USE: DATE RECEIVED: August 1998 DATA FILE ENTERED BY: Jim Laundre DATA FILE VALIDATION: NAME: Jim Laundre DATE: 12NOV98 LOG OF CHANGES AND COMMENTS: 17Jun99 added winter values and general error checked. Added Year value and change date value to dd-mmm-yyyy. JL