ARCTIC LTER DATABASE                                       

(1) FILE NAME: 99DLTLO

(2) YEAR: 1999

(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 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.

(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  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.  Net radiation and pan
evaporation are only measured during the summer months.  The hourly
data are in the file 99DLTLH.DAT, the three hourly data are in
99DLTLO.DAT, and daily summaries are in 99DLTLD.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 experim

(10) NOTES AND COMMENTS: Lake temperature is measured where the lake
depth measurement is made. Lake Depth sensor stopped working in
December 1998.  It was replaced with a temporary 2.5 psi depth sensor
for the summer. In August 1999 a 5 psi sensor was installed.  See notes
under comment variable.  Soil temperatures consist of two profiles in a
moss dominated plant community.  They are within 3 meters of the
weather station. Evaporation pan temperature sensor was not placed in
the water this summer.

(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, 98DLTLO
 (15) REFERENCE CITATIONS:


(16) FORMAT OF VARIABLES:  File Name:    99DLTLO.DAT File type:   Comma
delimited

(17) NUMBER OF RECORDS: RECORDS

(18) STATUS: Type 1 =========================================

(19) FOR ARCHIVAL USE:
     DATE RECEIVED: June 1999 DATA FILE ENTERED BY: Jim Laundre DATA
     FILE VALIDATION:
	  NAME: Jim Laundre DATE: 14OCT99

     LOG OF CHANGES AND COMMENTS:  10Dec99 Checked documentation and
data format for LTER database. JL