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:99dlsagh
Dataset Title:Arctic LTER 1999: Hourly weather data (temperature, radiation, wind, and relative humidity) from (Giblin, et al 1991) riverside toposequence site, in the northern foothills of the Brooks Range, Alaska.
Investigator 1: 
First Name:GUS
Last Name:SHAVER
Address line 1:
Address line 2:
Address line 3:
City:
State:
Zip Code:
Country:
Associate Investigators:JIM LAUNDRE
Keywords:weather, temperature, radiation, wind, relative humidity
Abstract: Hourly weather data (temperature, radiation, wind, and relative humidity) from (Giblin, et al 1991) riverside toposequence site, in the northern foothills of the Brooks Range, Alaska.
Contact: Arctic LTER Information Manager
The Ecosystems Center
Marine Biological Lab
7 MBL St
Woods Hole, MA 02543
Phone (508) 289 7496
Email: arc_im@mbl.edu
Online URL: http://ecosystems.mbl.edu/ARC/
DATA FILE INFORMATION:
Data File Name 99dlsagh
Beginning Date 5/1/1999
End Date 9/1/1999
Number of Data Records
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes: Log of changes: 17Jul97 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:
RESEARCH LOCATION:
Geographic Description Near the Sagavanirktok River (68 degrees 46?N, 148 degrees 52?W, elevation 470 m) northern foothills of Brook Range, Alaska, U.S.A.
Location Bounding Box
West Bounding Coordinate
East Bounding Coordinate
North Bounding Coordinate
South Bounding Coordinate
OR if single point location
Latitude
Longitude
TAXONOMIC COVERAGE:
Organisms studied
Methods:

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. Any missing May through October average air temperature data were estimated using regressions with the Toolik Field Station weather station (68 degrees 38'N, 149 degrees 36'W). For a description of the site see Shaver, et al. 1996.
In addition to air temperature and wind speed which are reported here, global incoming radiation, photosynthetically active radiation (PAR), soil temperatures and wind direction were recorded. See the hourly data files.
Sensors information:


TEMPERATURE AND RELATIVE HUMIDITY:
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 56?C is 1.0?C. RH: for a range of 12 - 100% the percentage error is 3. Upper temperature limit is 79?C.


WIND DIRECTION:
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 70?C.


WIND SPEED:
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 85?C.


PYRANOMEETER:
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%.


QUANTUM:
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.


RAIN GAUGE:
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 - 37?C.

Notes: 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.
Data logger stopped logging for a day December 6th. Not sure why.
For additional notes check the Comment variable in the dataset.

Reference Citations: Gilbin, A. E., K. J. Nadelhoffer, G. R. Shaver, J. A. Laundre and A.J. McKerrow. 1991. Biogeochemical diversity along a riverside toposequence in arctic Alaska. Ecological Monographs, 61(4):415-435.
Shaver, G. R., J. A. Laundre, A. E. Giblin, and K. J. Nadelhoffer. 1996. Changes in live plant biomass, primary production, and species composition along a riverside toposequence in arctic Alaska., U.S.A. Arctic and Alpine Research. 28(3):363-379.

Sampling Description.

None

Data Table

Variable    Variable description.            Precis./Units
YEAR            Year in yyyy
DAYS:           Julian day plus fraction of day
DATE:           Date                      dd-mmm-yyyy
MONTH           Month in integer form
ID:             Program step that output the data
JULIAN:         Julian date                 ddd
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
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
Comments:       Comments about individual data record
(12) CALCULATIONS
Variable             Formula
DAYS :           JULIAN + (HOUR/2400)