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Arctic LTER Database

Arctic LTER Database

Acceptance and utilization of LTER data requires that:

(1) The Principal Investigator be sent a notice stating reasons for acquiring any data and a description of the publication intentions.
(2) The Principal Investigator of the data set be sent a copy of the report or manuscript prior to submission and be adequately cited in any resultant publications.
(3) A copy of any resultant publications should be sent to:

Principal Investigator
Ecosystems Center
Marine Biological Laboratory
7 MBL St.
Woods Hole, MA 02543

Older Metadata: Attribute table not in XML (EML) file

Dataset URLs:METADATA: HTML, Rich Text, XML(EML compliant)
DATA: Comma Delimited, Excel file with Metadata and data
Dataset ID:95dlsag
Dataset Title:Arctic LTER 1995: Weather data (temperature, radiation, wind, and relative humidity) from the Campbell CR10 data logger at the Sag River Heath site.
Investigator 1: 
First Name:GUS
Last Name:SHAVER
Address line 1:
Address line 2:
Address line 3:
Zip Code:
Associate Investigators:JIM LAUNDRE
Keywords:weather, temperature, radiation, wind, relative humidity
Abstract: Weather data (temperature, radiation, wind, and relative humidity) from the Campbell CR10 data logger at the Sag River Heath site.
Contact: Arctic LTER Information Manager
The Ecosystems Center
Marine Biological Lab
7 MBL St
Woods Hole, MA 02543
Phone (508) 289 7496
Online URL:
Data File Name 95dlsag
Beginning Date 5/1/1995
End Date 9/1/1995
Number of Data Records
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes: Log of changes: 18Mar96 Collated data files into Excel worksheets and error checked. JL For Archival Use: DATE RECEIVED: DATA FILE ENTERED BY: Jim Laundre DATA FILE VALIDATION: NAME: DATE:
Geographic Description Sagavanirktok River (68 degrees 46'N, 148 degrees 52'W, elevation 470 m) North Slope, Alaska, U.S.A.
Location Bounding Box
West Bounding Coordinate
East Bounding Coordinate
North Bounding Coordinate
South Bounding Coordinate
OR if single point location
Organisms studied

In the summer of 1987 a weather station was placed on an old floodplain terrace about 200 m from the Sagavanirktok River. The site is vegetated by dwarf shrubs of Ericads and Betula. Initially the station was operational from late May/early June through August. In 1993 the station became year round.
Sensors include:
Campbell Scientific, Model 207 Temperature and Relative Humidity Probe. Temperature sensor is a Fenwall electronics thermistor and the Relative Humidity sensor is a Phys-chemical Research sensor. Specs: Temp: Accuracy over the range -40 to 56C is 1.0C. RH: for a range of 12 - 100% the percentage error is 3. Upper temperature limit is 79C.
MET-ONE, (supplied by Campbell Scientific) Wind direction use a light weight, air foil vane and a potentiometer to produce an output that varies proportional with wind direction. Specs: Minimum Wind speed to get accurate reading = 1.0 mph. Accuracy 5 Temperature range -50 to 70C.
MET-ONE, (supplied by Campbell Scientific) Wind speed sensor Model 014A. Sensor uses a 3-cup anemometer assembly and simple magnet-read switch assembly to produce a series of contact closures whose frequency is proportional to wind speed. Specs: Operating Range - 0 to 125 mph or 0-60 m/s. Accuracy 1.5% or 0.25 mph. Working temperature range -50 to 85C.
Li-Cor, Pyranometer: Model LI-200SB- Pyranometer is calibrated to detect most the daylight spectrum (sunlight and PAR). Specs: Sensitivity - 80mA per 1000 Watts m-2. Absolute error max 5% but typically 3%.
Li-Cor, Quantum. Model LI-190SB. Quantum measure photosynthetically active radiation (PAR) in mEinsteins S-1 m-2. Specs: range 400-700nm wavelength. Sensitivity 8mA/1000 mE s-1 m-2. Relative error less then 10% for plant canopies or less then 5% for growth chambers.
Texas Electronics, Inc. (supplied by Campbell Scientific) Tipping Bucket Electric Rain Gauge. A complex spun collector funnel with a knife edge that diverts the water to a tipping bucket mechanism. For each tip a magnet causes an electronic pulse that is recorded. Each alternate tip occurs for each 0.01 inch of rainfall. Specs: Accuracy 1% at 2 inches/hr or less. Accurate Temperature Range: 0 - 37C.

Notes: The battery stopped working during the winter (28Feb95) and the data logger was not started until 17Jun95. At that time the data logger time was not set. The time was corrected in this file but it results in averages at odd times. Soil temperature thermisters stopped working. NOTE: In the wind speed program step, the .447 offset was forgotten. Wind speed was corrected but wind vector magnitude was deleted. Wind speeds less than .447 are considered calm. Quantum has an offset of -2.7. The data is not corrected.
For the global solar radiation and photosynthetically active radiation sensors no attempt is made to correct for frost or snow on the sensors during the winter months. Therefore winter radiation data should be view as suspect and used only qualitatively.
Air temperature at 5 meters is measured using Campbell's 207 probes. The thermisters' range only goes to -40 Celsius, therefore temperatures below - 40 are inaccurate.

Reference Citations: Buck, A.L.. 1981 New equations for computing vapor pressure and enhancement factor. Journal of Applied Meteorology 20:1527-1532.

Sampling Description.


Data Table

Variable    Variable description.            Precis./Units
DAYS:           Julian day plus fraction of day
DATE:           Date                      dd-mmm-yy
MONTH           Month in integer form
ID:             Program step that output the data
JULIAN:         Julian date                 yyddd
HOUR:           Time - Alaska standard time 2400
RAIN:           Rainfall                     mm
PYRANOMETER:    Pyranometer    kilowatts m-2
QUANTUM:        Quantum              microeinsteins m-2 sec-1
AIR TEMP 5M:    Air temperature at 5 meters   Celsius
RH 5M:          Relative humidity at 5 meters percent
VAPOR PRESS 5M: Vapor pressure at 5 meters    millibars
WIND SPEED:     Wind speed at 5 meters         m/s
WIND VEC MAG:   Wind vector magnitude at 5 meters m/s
WIND VEC DIR:   Wind vector direction at 5 meters
STD DEV DIR:    Wind vector direction standard deviation at 5 m
Variable             Formula
DAYS :           JULIAN + (HOUR/2400)
VAPOR PRESS 5M:  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).

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