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Conditions of Use

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 via LTER Data Poral
Dataset ID:89dltlh.04
Dataset Title:Hourly weather data from Toolik Field Station, ARC LTER, Alaska for 1989.
Investigator 1: 
First Name:Gus
Last Name:Shaver
Organization:Marine Biological Lab
Address line 2: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:Ecosystems Center
Address line 3:7 MBL St
City:Woods Hole
State:MA
Zip Code:02543
Country:USA
Associate Investigators:
Keywords:weather, temperature, radiation, wind, relative humidity
Abstract:Hourly weather data from the Arctic Tundra LTER site at Toolik Lake. The following parameters are measured every minute and averaged or totaled every hour; air temperature and relative humidity at 1 and 5 meters, wind speed at 1 and 5 meters, wind direction at 5 meters, global solar radiation, photosynthetically active radiation, net radiation (Fritschen type), barometric pressure, and unfrozen precipitation
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.1509&urlTail=weather/tl/data/89dltlh.csv
Data File Name 89dltlh.dat
Beginning Date 5/1/1989
End Date 9/1/1989
Number of Data Records 8760
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes: Log of changes: Last changed: 4Jan89-Changed AIR TEMP 5M < -40 C to the value of AIR TC 1.5M. Thermister at 5 meters only good to -40 C. Missing values and bad values for WIND DIR 5M, WIND DIR STD 5M, and PYRANOMETER were set to missing. Jim L. 9Jan89 Added soil and lake temperatures from table 2 file. 10Jan89 Set up files in common format for table 1 data. Split data up into four month files. Jim L. 13FEB89. Created VAPOR PRESS and PYR TOTAL J CM2 HOUR. JL 13Jul99 Standardized the document file and variable names. Checked to make sure that the 0 hour data was changed to 2400 with correct Julian day. Output a combined hourly file for the web. JL For Archival Use: DATE RECEIVED: Apr90 DATA FILE ENTERED BY: Julie Pallant DATA FILE VALIDATION: NAME: Julie Pallant DATE: 4Oct91
Version 3: Metadata updated to newer form (with sites sheet). Units updated to current standards. Discrepancy with variable names fixed. CH April 2013.
Version 4: Corrected Distrubution URL. It had xlsfiles in the path. Jim L 19Jun14
 
RESEARCH LOCATION:                  
Location Name TFS Weather Station 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 University of Alaska Fairbanks Toolik Field Station, North Slope of Alaska (68 degrees 38'N, 149 degrees 36'W) 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 68.628228973 In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees  
Longitude -149.596001285 In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees  
Elevation 726.5 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:

Weather data has been collected at Toolik Lake (68 degrees 38'N, 149 degrees 36'W) by a Campbell 21x datalogger since June 1988. Sensors that are measured every minute and averaged or totaled every hour include: air temperature and relative humidity at 1 and 5 meters, wind speed at 1 and 5 meters, wind direction at 5 meters, global solar radiation, photosynthetically active radiation, net radiation (Fritschen type), barometric pressure, and unfrozen precipitation. Sensors measured every 10 minutes and averaged every three hours include: soil temperatures, lake temperature, lake depth, and evaporation pan depth and pan water temperature. Net radiation and pan evaporation are only measured during the summer months. The hourly data are in the file 89DLTLH.DAT, the three hourly data are in 89DLTLO.DAT, and daily summaries are in 89DLTLD.DAT. Data in the field are stored on a Campbell SM716 storage module (capacity of 358,000 data points ). In the summer a direct line from the datalogger to a computer allows data to be viewed and collected daily. A second Campbell 21x datalogger about 700 meters from the main weather station logs air and soil temperatures and photosynthetically active radiation in the experimental treatment plots. Treatments include greenhouse, shading, and fertilization. In the control plot wind speed and direction, global solar radiation and unfrozen precipitation are also measured. This station is also used as a backup to the main weather station. The full description of the sensors and site is in file SENSORS.DOC. The original data is in file 89DLTDAT.ZIP which is archived at The Marine Biological Lab, Woods Hole, MA.

Notes: Wind speed less than .447 is considered calm. A number of sensors were unhooked for the winter months. Changed AIR TEMP 5M < -40 C to the value of AIR TC 1M. Thermister at 5 meters is only good to -40 C. Temperature data from Kane and Hinzman's Imnavait weather station included and and used to fill in some missing data. Since the Imnavait station is about 200 meters higher in elevation and 12 km east, regression equations were developed using data from before and after missing data. The precipitation tipping rain bucket has an Alter type wind screen. 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. See additional notes under Comments variable.

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 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).
TOTAL J CM2 HOUR: PYRANOMETER * .3600 jcm2 * 1000 watt/Kwatt

Imnavait data collected by Larry Hinzman and Doug Kane Water Research Center; University of Alaska Fairbanks Fairbanks, AK 99775-5860

Data Table

Variable Name Variable Description Data Type Units DateTime Format Code Information Missing Value Code
YEAR Year in yyyy datetime   yyyy    
DATE Date of collection datetime   dd-mmm-yyyy    
MONTH Month of collection number number      
DAYS Julian plus fraction of day number number      
ID Datalogger program step. number number     #N/A=Missing or Not Measured
JULIAN Julian Day number number      
HOUR Time in Alaska standard time datetime   hhmm    
RAIN Rainfall number millimeter     #N/A=Missing or Not Measured
PYRANOMETER Global solar radiation (Sun + sky radiation(LI-200SB)) kilowatts/m2/s number kilowattPerMeterSquaredPerSecond     #N/A=Missing or Not Measured
LAKE QUANTUM QUANTUM Lake quantum sensor number micromolePerMeterSquaredPerSecond     #N/A=Missing or Not Measured
QUANTUM Quantum sensor number micromolePerMeterSquaredPerSecond     #N/A=Missing or Not Measured
AIR TEMP 1M Air temp at 1 meters in number celsius     #N/A=Missing or Not Measured
AIR TEMP 5M Air temp at 5 meters in number celsius     #N/A=Missing or Not Measured
RH 1M Relative humidity at 1 meters percent number percent     #N/A=Missing or Not Measured
RH 5M Relative humidity at 5 meters percent number percent     #N/A=Missing or Not Measured
BAROMETER Barometer readings mmHg number millimeter     #N/A=Missing or Not Measured
WIND SP 1M Wind Speed at 1 meters number meterPerSecond     #N/A=Missing or Not Measured
AIR TC 1M Air temp at 1 meter, (thermocouple) Celsius number celsius     #N/A=Missing or Not Measured
AIR TC 5M Air temp at 5 meter, (thermocouple) Celsius number celsius     #N/A=Missing or Not Measured
WIND SP 5M Wind Speed at 5 meters in number meterPerSecond     #N/A=Missing or Not Measured
WIND MAG 5M Wind vector magnitude at 5m number meterPerSecond     #N/A=Missing or Not Measured
WIND DIR 5M Wind direction at 5 meters number degree     #N/A=Missing or Not Measured
WIND STD 5M Wind direction standard deviation at 5 meters number degree     #N/A=Missing or Not Measured
VAPOR PRESS 5M millibars number millibar     #N/A=Missing or Not Measured
PYR J CM2 HR Total joules per sq cm integrated over an hour number joulePerCentimeterSquaredPerHour     #N/A=Missing or Not Measured
WIND SECTOR Compass direction of WIND DIR 5M 45 degree sectors text        
NET RAD Net radiation number kilowattPerMeterSquared     #N/A=Missing or Not Measured
DATE Stowaway The date and hour of the stowaway logger. dmm/dd/yy hr:mm. datetime   mmm-dd-yyyy hh:mm    
Stowaway 1M Air temperature measured with a Stowaway logger at 1 meter in the same radiation shield. Celsius number celsius     #N/A=Missing or Not Measured
COMMENTS Comments on individual data points text        
Imnavait AIR 10M Air temperature 10 meter from Imnavait basin(68o37'N 149o17'W) number celsius     #N/A=Missing or Not Measured
Imnavait AIR 2M Air temperature 5 meter from Imnavait basin(68o37'N 149o17'W) number celsius     #N/A=Missing or Not Measured
Imnavait AIR 1M Air temperature 1 meter from Imnavait basin(68o37'N 149o17'W) number celsius     #N/A=Missing or Not Measured
Estimated Imnavait AIR 5M Estimated 5 Meter from Imnavait 2 meter number celsius     #N/A=Missing or Not Measured
Tussock CTEMP 3M Toolik Tussock site datalogger 3 meter air Temp. number celsius     #N/A=Missing or Not Measured
Tussock RAIN Toolik Tussock site datalogger Rain. number millimeter     #N/A=Missing or Not Measured

Please contact arc_im@mbl.edu with questions, comments, or for technical assistance regarding this web site.