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:	91dltuh.3
Dataset Title:	Hourly weather data from the Arctic LTER Toolik Tussock Experimental plots, Arctic LTER 1991.
Investigator 1:
First Name:	Gus
Last Name:	Shaver
Organization:	Marine Biological Laboratory
Address line 2:	The Ecosystems Center
Address line 3:	7 MBL Street
City:	Woods Hole
State:	MA
Zip Code:	02543
Country:	USA
Investigator 2:
First Name:	Jim
Last Name:	Laundre
Organization:	Marine Biological Laboratory
Address line 2:	The Ecosystems Center
Address line 3:	7 MBL Street
City:	Woods Hole
State:	MA
Zip Code:	02543
Country:	USA
Investigator 3:
First Name:	Julie
Last Name:	Pallant
Organization:
Address line 2:
Address line 3:
City:
State:
Zip Code:
Country:
Associate Investigators:
Keywords:	weather, temperature, relative humidity, radiation, wind, greenhouses, shade houses
Abstract:	Hourly weather data from the Arctic LTER Toolik Tussock Experimental plots. In 1990 a Campbell CR21x datalogger was installed in block 2 of the Toolik LTER experimental 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.1553&urlTail=weather/tu/data/91dltuh.csv
Data File Name	91dltuh.dat
Beginning Date	5/1/1991
End Date	9/1/1991
Number of Data Records	7494
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes:	Log of changes: 23Apr97 Error checked and added in missing days as N/A. Jim L . 19Oct00 Added year and y2k date.:JimL For Archival Use: DATE RECEIVED: SEP91 DATA FILE ENTERED BY: Julie Pallant DATA FILE VALIDATION: NAME: Julie Pallant DATE: 30Sep91
	Version 3: 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 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	68.624411	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees
Longitude	-149.609589	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:	A Campbell CR21x datalogger is used to monitor weather and soil temperatures in the LTER experimental plots. Soil thermocouples were multiplexed with a Campbell AM416 multiplexer. In the control plot sensors include: global solar radiation, photosynthetically active radiation, net radiation (Fritschen type), unfrozen precipitation and air temperature, relative humidity, wind speed, and wind direction at 3 meters. In the greenhouses and shade houses plots, air temperature, relative humidity and photosynthetically active radiation were also measured during the growing season. These sensors were read every minute and averaged or totaled every hour. In each plot two strings (one in a tussock and one in a moss-dominated area) of copper/constantin thermocouple wires (TC) were installed at depths of 10, 20, and 40 cm. The following label codes were used: CT=control, GH = greenhouses, SH = shade houses, F=fertilized, GF= greenhouse fertilized, SF = Shade house fertilized, with a suffix of 1 for tussock or 2 for moss bed. All measurements are in degree Celsius. In addition two thermisters/moisture blocks (Soiltest model MC360) were installed in each plot just below the surface soil. The soil moisture blocks did not work well in the high organic soil and therefore the data are ignored. All soil sensors were read every 15 minutes and averaged every 3 hours. During the winter months just daily soil values were stored. Hourly data are in the files yyDLTUH.DAT, the three hourly data are in yyDLTUO.DAT, and daily summaries are in yyDLTUD.DAT, where yy is the year in which the data are collected. The original data is in file yyDLTDAT.ZIP which is archived at The Marine Biological Lab, Woods Hole, MA. Note: The cover on greenhouses and shade houses are removed every fall and reinstalled every spring. Notes: Missing days: Day 167 hour 1600 to day 172 hour 1400 (Bad connection); Day 228 hour 1100 to day 231 hour 1900; Day 313 hour 0500 to end of year (Battery volts dropped below 9.7). Wind speeds less then .447 are considered calm. Pyranometer had an offset of -0.008; data was not corrected. Quantum sensors would go negative during low light/darkness. Most of the time the offset was -2.236 but occasionally one would read >-44. For the global solar 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. The control RH sensor is bad, never getting above 82%. Data are report but not used in vapor pressure calculation. Reference Citations: Buck, A.L. 1981 New equations for computing vapor pressure and enhancement factor. Journal of Applied Meteorology 20:1527-1532. Sampling Description. 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 GQUANT E m2 Average (north and south quantum sensors) *60 sec *60 min * 10^-6 E/uE GQUANT E m2 Control quantum sensor *60 sec *60 min * 10^-6 E/uE

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	datetime		mm
DAYS	Julian plus fraction of day	datetime		ddd
ID	Program step that output the data	text
JULIAN	Julian Date	datetime		ddd
HOUR	Time -Alaska standard time	datetime		hhrr
RAIN	Rainfall	number	millimeter			#N/A=Missing or Not Measured
GTEMP S	Greenhouse temperature south end of greenhouse in Celsius	number	celsius			#N/A=Missing or Not Measured
GTEMP N	Greenhouse temperature north end of greenhouse in Celsius	number	celsius			#N/A=Missing or Not Measured
GTEMP Avg	Average of GTEMP N and GTEMP S in Celsius	number	celsius			#N/A=Missing or Not Measured
STEMP S	Shade house temperature south end of shade house Celsius	number	celsius			#N/A=Missing or Not Measured
STEMP N	Shade house temperature north end of shade house Celsius	number	celsius			#N/A=Missing or Not Measured
STEMP Avg	Average of STEMP N and STEMP S in Celsius	number	celsius			#N/A=Missing or Not Measured
CTEMP 3M	Control temperature at 3m in Celsius	number	celsius			#N/A=Missing or Not Measured
GRH S	Greenhouse % Relative Humidity south	number	percent			#N/A=Missing or Not Measured
GRH N	Greenhouse % Relative Humidity north	number	percent			#N/A=Missing or Not Measured
SRH S	Shade house % Relative Humidity south	number	percent			#N/A=Missing or Not Measured
SRH N	Shade house % Relative Humidity north	number	percent			#N/A=Missing or Not Measured
CRH 3M	Control Relative Humidity at 3m	number	percent			#N/A=Missing or Not Measured
GQUANT S	Greenhouse Quantum south uEinstein m-2 sec-1	number	microEinsteinPerMeterSquaredPerSecond			#N/A=Missing or Not Measured
GQUANT N	Greenhouse Quantum north uEinstein m-2 sec-1	number	microEinsteinPerMeterSquaredPerSecond			#N/A=Missing or Not Measured
GQUANT E	m2 Average of GQUANT N and GQUANT S in E m-2 per hour	number	microEinsteinPerMeterSquaredPerSecond			#N/A=Missing or Not Measured
SQUANT S	Shade house Quantum south uEinstein m-2 sec-1	number	microEinsteinPerMeterSquaredPerSecond			#N/A=Missing or Not Measured
SQUANT N	Shade house Quantum north uEinstein m-2 sec-1	number	microEinsteinPerMeterSquaredPerSecond			#N/A=Missing or Not Measured
SQUANT E	m2 Average of SQUANT N and SQUANT S in E m-2 per hour	number	microEinsteinPerMeterSquaredPerSecond			#N/A=Missing or Not Measured
CQUANT	Control Quantum uEinstein m-2	number	microEinsteinPerMeterSquaredPerSecond			#N/A=Missing or Not Measured
CQUANT E	m2 CQUANT in Einstein m-2 per hour	number	microEinsteinPerMeterSquaredPerSecond			#N/A=Missing or Not Measured
PYRANOMETER	PYRANOMETER: global solar radiation (sun plus sky), averaged over measurement interval (kw/m-2/s-1)	number	kilowattPerMeterSquaredPerSecond			#N/A=Missing or Not Measured
NET RAD	Net radiation kilowatts m-2 sec-1	number	meterSquaredPerSecond			#N/A=Missing or Not Measured
WIND SPEED 3M	Wind speed at 3 meters m/s	number	meterPerSecond			#N/A=Missing or Not Measured
WIND MAG	Wind vector magnitude at 3M	number	meterPerSecond			#N/A=Missing or Not Measured
WIND DIR 3M	Wind direction at 3M	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	Vapor pressure: mbar	number	millibar			#N/A=Missing or Not Measured
PYR TOTAL CM2 HR	Pyranometer per hour: joules/cm2/hr	number	joulePerCentimeterSquaredPerHour			#N/A=Missing or Not Measured
COMMENTS	Comments about individual datum points.	text
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