96dlsag GUS SHAVER JIM LAUNDRE additional investigator Weather data (temperature, radiation, wind, and relative humidity) from the Campbell CR10 data logger at the Sag River Heath site. weather temperature radiation wind relative humidity Acceptance and utilization of LTER data requires that: The Principal Investigator be sent a notice stating reasons for acquiring any data and a description of the publication intentions. 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 A copy of any resultant publications should be sent to: Principal Investigator Ecosystems Center Marine Biological Laboratory Woods Hole, MA 02543 http://ecosystems.mbl.edu/ARC/data/96dlsag.dat Sagavanirktok River (68 degrees 46’N, 148 degrees 52’W, elevation 470 m) North Slope, Alaska, U.S.A. -149.75 -149.0433 68.8 68.5 610 1360 meter 1996 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: Data Manager

The Ecosystems Center Marine Biological Lab 7 MBL St Woods Hole MA 02543 USA

(508) 289 7496 arc_im@mbl.edu http://ecosystems.mbl.edu/ARC/ ARC LTER

The Ecosystems Center Marine Biological Lab 7 MBL St Woods Hole MA 02543 USA

(508) 289 7496 arc_im@mbl.edu http://ecosystems.mbl.edu/ARC/ 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: 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. The RH sensor gave low readings. Data was deleted. New sensor was added August 20th. 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. GEO-1

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uid=ARC,o=lter,dc=ecoinformatics,dc=org all public read 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 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 on data points (12) CALCULATIONS Variable Formula DAYS : JULIAN + (HOUR/2400) TERRESTRIAL