Arctic LTER Database

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The re-use of scientific data has the potential to greatly increase communication, collaboration and synthesis within and among disciplines, and thus is fostered, supported and encouraged. Permission to use this dataset is granted to the Data User free of charge subject to the following terms:

1) Acceptable use. Use of the dataset will be restricted to academic, research, educational, government, recreational, or other not-for-profit professional purposes. The Data User is permitted to produce and distribute derived works from this dataset provided that they are released under the same license terms as those accompanying this Data Set. Any other uses for the Data Set or its derived products will require explicit permission from the dataset owner.
2 ) Redistribution. The data are provided for use by the Data User. The metadata and this license must accompany all copies made and be available to all users of this Data Set. The Data User will not redistribute the original Data Set beyond this collaboration sphere.
3 ) Citation. It is considered a matter of professional ethics to acknowledge the work of other scientists. Thus, the Data User will properly cite the Data Set in any publications or in the metadata of any derived data products that were produced using the Data Set. Citation should take the following general form: Creator, Year of Data Publication, Title of Dataset, Publisher, Dataset identifier. For example:

Shaver, G. 1989. Above ground biomass in acidic tussock tundra experimental site, 1989, Arctic LTER, Toolik, Alaska. Arctic LTER, Marine Biological Lab, Woods Hole, Ma 02543. 1989gsttbm http://ecosystems.mbl.edu/arc/terrest/biomass/index.shtml 

4 ) Acknowledgement. The Data User should acknowledge any institutional support or specific funding awards referenced in the metadata accompanying this dataset in any publications where the Data Set contributed significantly to its content. Acknowledgements should identify the supporting party, the party that received the support, and any identifying information such as grant numbers. For example:

Data sets were provided by the Arctic LTER. This material is based upon work supported by the National Science Foundation under Grants #DEB-981022, 9211775, 8702328; #OPP-9911278, 9911681, 9732281, 9615411, 9615563, 9615942, 9615949, 9400722, 9415411, 9318529; #BSR 9019055, 8806635, 8507493.

5 ) Notification. The Data User will notify the Data Set Contact when any derivative work or publication based on or derived from the Data Set is distributed. The Data User will provide the data contact with two reprints of any publications resulting from use of the Data Set and will provide copies, or on-line access to, any derived digital products. Notification will include an explanation of how the Data Set was used to produce the derived work.
6 ) Collaboration. The Data Set has been released in the spirit of open scientific collaboration. Data Users are thus strongly encouraged to consider consultation, collaboration and/or co-authorship with the Data Set Creator.

By accepting this Data Set, the Data User agrees to abide by the terms of this agreement. The Data Owner shall have the right to terminate this agreement immediately by written notice upon the Data User's breach of, or non-compliance with, any of its terms. The Data User may be held responsible for any misuse that is caused or encouraged by the Data User's failure to abide by the terms of this agreement.

Disclaimer

While substantial efforts are made to ensure the accuracy of data and documentation contained in this Data Set, complete accuracy of data and metadata cannot be guaranteed. All data and metadata are made available "as is". The Data User holds all parties involved in the production or distribution of the Data Set harmless for damages resulting from its use or interpretation.

Dataset URLs:	METADATA: HTML, Rich Text, XML(EML compliant) DATA: Comma Delimited, Excel file with Metadata and data
Dataset ID:	2003dltuh.4
Dataset Title:	Hourly weather data from the Arctic LTER Moist Acidic Tussock Experimental plots for 2003, Toolik Filed Station, North Slope, Alaska.
Investigator 1:
First Name:	Gus
Last Name:	Shaver
Organization:	Marine Biological Lab
Address line 2:	The Ecosystems Center
Address line 3:	7 MBL St
City:	Woods Hole
State:	MA
Zip Code:	02543
Country:	USA
Investigator 2:
First Name:	Jim
Last Name:	Laundre
Organization:	Marine Biological Lab
Address line 2:	The Ecosystems Center
Address line 3:	7 MBL St
City:	Woods Hole
State:	MA
Zip Code:	02543
Country:	USA
Associate Investigators:
Keywords:	weather, air temperature, relative humidity, soil temperature, radiation, wind
Abstract:	Hourly weather data from the LTER Moist AcidicTussock Experimental plots. In 1990 a Campbell CR21x data logger was installed in block 2 of the Toolik LTER experimental moist acidic tussock plots. The plots are located on a hillside near Toolik Lake (68 38' N, 149 36'W). Sensors were placed in control, fertilized, greenhouse, greenhouse fertilized, shade house and shade house fertilized sites.
For questions about the Metadata and data contact the Investigators. For information about this web site 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 URL	http://metacat.lternet.edu/das/dataAccessServlet?docid=knb-lter-arc.1548&urlTail=weather/tu/data/2003dltuh.csv
Data File Name	2003dltuh.dat
Beginning Date	1/1/2003
End Date	12/31/2003
Number of Data Records	1734
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes:	Version 1: DATA FILE ENTERED BY: J.Laundre
	Version2 : Put metadata into excel metadata form; added title.
	Version 3: Upadte LTERNET Data Access server proxy link for Excel and comma delimited data files. Changed from knb to das in url.
	Version 4: Metadata updated to newer form (with sites sheet). Units updated to current standards. Discrepancy with variable names fixed. CH April 2013.

RESEARCH LOCATION:
Location Name	LTER Moist Acidic Tussock Tundra	Select Site or enter New One	Select Site or enter New One	Select Site or enter New One	Select Site or enter New One	Select Site or enter New One	Select Site or enter New One	Select Site or enter New One
Geographic Description	Toolik Lake Field Station (68 38' N, 149 36'W), LTER acidic tussock site on hill south of Toolik Lake, North Slope of Alaska.	Enter Description	Enter Description	Enter Description	Enter Description	Enter Description	Enter Description	Enter Description
Location Bounding Box
West Bounding Coordinate
East Bounding Coordinate
North Bounding Coordinate
South Bounding Coordinate
OR if single point location
Latitude	68.624	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees
Longitude	-149.607	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees
Elevation	750	In Meters	In Meters	In Meters	In Meters	In Meters	In Meters	In Meters
Link to Google Map	View on Google Map

TAXONOMIC COVERAGE:
Organisms studied
Methods:	In 1990 a Campbell CR21x data logger was installed in block 2 of the Toolik LTER experimental moist acidic tussock plots. to monitor weather and soil temperatures in the experimental treatments. Sensors in the control plot include: global solar radiation, photosynthetic active radiation, unfrozen precipitation (Alter wind shielded), air temperature, relative humidity, wind speed, and wind direction at 3 meters. Additional seasons in greenhouses and shade houses plots measure air temperature, relative humidity and photosynthetic active radiation during the growing season. These sensors are read every minute and averaged or totaled every hour. Two profiles of soil temperature are measured per treatment plot with copper/constantin thermocouple wires (TC) installed at depths of 10, 20, and 40 cm in inter-tussock areas. The following label codes are used: CT = control, GH = greenhouses, SH = shade houses, F = fertilized, GF= greenhouse fertilized, SF = shade house fertilized, plus a 1 or a 2 for the profile number. All soil sensors are read every 15 minutes and averaged every 3 hours. Hourly, three hourly and daily summaries are in files yyDLTUH.DAT, yyDLTUO.DAT, and yyDLTUD.DAT respectively, where yy is the year in which the data are collected. The original data are in file yyDLTDAT.ZIP which is archived at The Marine Biological Lab, Woods Hole, MA. Note: The covers on greenhouses and shade houses are removed every fall and reinstalled every spring. Notes: Only unfrozen precipitation is reported. Data was lost during the winter. The cause is unknown. The logger was reading the sensors but not storing to final storage. It could have been caused by a bad temperature/RH probe. The Campbell CS500 temperature/RH sensors were problematic. The splice in the lead let moisture infiltrated the lead wire splice joint and resulting in a short which caused bad readings and in the worst case it affected other sensors on the data logger. Soil temperatures are problematic since frost heaving of the probes caused depth of measurements to change. Wind speeds of less then 0.447 m/s are considered calm. For the global solar radiation and photosynthetic 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. Missing values are indicated by #N/A. CALCULATIONS Variable Formula DAYS: JULIAN + (HOUR/2400) VAPOR PRESS : 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)) PYR TOTAL CM2 HOUR: PYRANOMETER * 0.3600 jcm2 * 1000 Watt/Kwatt ----------------------------------------------------------------------------------------------------------------------------------------------- Sensor Description Following are brief descriptions of the sensors used at the weather monitoring station. Included with each description is a list of stations using the sensor and the number of sensors at that site. Company addresses follow the list. --------------------------------------------------------------------------------------------------------------------------------------------- PYRANOMETER: Li-Cor, Pyranometer: Model LI-200SA- Sensor measures global solar radiation (sun plus sky). 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 ?mol s-1 m-2. Specs: range 400-700nm wavelength. Sensitivity 8mA/1000 ?mol s-1 m-2. Relative error less then ±10% for plant canopies or less then ±5% for growth chambers. Toolik. RELATIVE HUMIDITY/TEMPERATURE: Campbell Scientific, CS500 Temperature and Relative Humidity Probe. Uses PRT for temperature measurement; capacitive RH chip for RH. Accuracy is ±3% over 10-90% RH; ±6% over 90-100% RH. Manufactured by Vaisala, Inc. 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 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. Alter wind shield installed around gauge. THERMOCOUPLES: Omega Engineering, Copper-Constantan wire. Range -200 to 350 °C. Limits of error: Standard wire 1.0°C or 0.75% above 0°C and 1.0°C or 1.5% below 0°C. Special wire 0.5°C or 0.4%. List of manufactories and suppliers. Campbell Scientific, Inc. 81 W. 1800 N. Logan, Utah 84321-1784 (435)750-1739 Druck Inc. 4 Dunham Drive New Fairfield, CT 06812 (203)746-0400 Li-Cor 4421 Superior St P.O. Box 4425 Lincoln, Nebraska 68504 (800)447-3576 Omega Engineering, Inc. P.O. Box 4047 Stamford, CT 06907-0047 (800)826-6342 Reference Citations: Buck, A.L. 1981 New equations for computing vapor pressure and enhancement factor. Journal of Applied Meteorology 20:1527-1532.

Data Table

Variable Name	Variable Description	Data Type	Units	DateTime Format	Code Information	Missing Value Code
YEAR	Year	datetime		yyyy
DATE	Date	datetime		dd-mmm-yyyy
MONTH	Month in integer form	datetime		mm		#N/A=Missing or Not Measured
DAYS	Julian day plus fraction of day	number	number			#N/A=Missing or Not Measured
ID	The datalogger program output step number	number	number			#N/A=Missing or Not Measured
JULIAN	Julian date	number	number			#N/A=Missing or Not Measured
HOUR	Time - Alaska standard time 2400 format	datetime		hhmm		#N/A=Missing or Not Measured
RAIN	Rainfall	number	millimeter			#N/A=Missing or Not Measured
GTEMP	Greenhouse temperature at about 1 meter	number	celsius			#N/A=Missing or Not Measured
STEMP	Shade house temp	number	celsius			#N/A=Missing or Not Measured
CTEMP 3M	Control temp at 3 meters	number	celsius			#N/A=Missing or Not Measured
GRH	Greenhouse Relative Humidity	number	percent			#N/A=Missing or Not Measured
SRH	Shade house Relative Humidity	number	percent			#N/A=Missing or Not Measured
CRH 3M	Control Relative Humidity at 3 meters	number	percent			#N/A=Missing or Not Measured
GQUANT	Greenhouse Average Photosynthetic Active Radiation (PAR) over an hour as measured with a LiCor Quantum sensor	number	micromolePerMeterSquaredPerSecond			#N/A=Missing or Not Measured
SQUANT	Shade house Average Photosynthetic Active Radiation (PAR) over an hour as measured with a LiCor Quantum sensor	number	micromolePerMeterSquaredPerSecond			#N/A=Missing or Not Measured
CQUANT	Control Average Photosynthetic Active Radiation (PAR) over an hour as measured with a LiCor Quantum sensor	number	micromolePerMeterSquaredPerSecond			#N/A=Missing or Not Measured
PYRANOMETER	PYRANOMETER: global solar radiation (sun plus sky), averaged over measurement inveral (kw/m-2/s-1)	number	kilowattPerMeterSquaredPerSecond			#N/A=Missing or Not Measured
WIND SPEED	Wind speed at 3 meters	number	meterPerSecond			#N/A=Missing or Not Measured
WIND MAG	Wind vector magnitude at 3 meters	number	meterPerSecond			#N/A=Missing or Not Measured
WIND DIR	Wind direction at 3 meters	number	degree			#N/A=Missing or Not Measured
WIND DIR STD	Wind vector direction standard deviation	number	degree			#N/A=Missing or Not Measured
VAPOR PRESS 3M	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).	number	millibar			#N/A=Missing or Not Measured
VAPOR PRESS SH	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).	number	millibar			#N/A=Missing or Not Measured
PYR J CM2 HR	Total joules/cm2 over an hour (PYRANOMETER * .3600 jcm2 * 1000 watt/Kwatt)	number	joulePerCentimeterSquaredPerHour			#N/A=Missing or Not Measured
COMMENTS	Comments about individual datum points.	text
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