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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:93dltld.04
Dataset Title:Daily weather data file for Arctic Tundra LTER site at Toolik Lake, Arctic LTER 1993.
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, wind, rain
Abstract:Daily weather data file for Arctic Tundra LTER site at Toolik Lake. Included are daily averages and/or maximums and minimums of air, soil and lake temperature, wind speed, vapor pressure, and sum of global radiation and unfrozen precipitation recorded near Toolik Lake.
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.1520&urlTail=weather/tl/data/93dltld.csv
Data File Name 93dltld.dat
Beginning Date 5/1/1993
End Date 9/1/1993
Number of Data Records 365
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes: Log of changes: 14Sept94 Added the rest of the end of year data and updated the documentation file. Jim Laundre. 6DEC99 Updated date and year to four digits. Changed variable names to the unified names and order. JL For Archival Use: DATE RECEIVED: June 1994 DATA FILE ENTERED BY: Jim Laundre DATA FILE VALIDATION: NAME:Jim Laundre 03 Oct 1994
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 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 datatlogger 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 93DLTLH.DAT, the three hourly data are in 93DLTLO.DAT, and daily summaries are in 93DLTLD.DAT. 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 93DLTDAT.ZIP which is archived at The Marine Biological Lab, Woods Hole, MA.

Notes: Wind speed less than .447 is considered calm. Data is missing for the following periods:
93014 to 93166 - Top tower blew off; 5 Meter - Temp, RH, Wind direction and Wind speed no good. Also caused 1 meter Temp, RH to be erratic from 93130-93166. Soil temperature for set 2 were out of range during the winter. Missing data for air temperature and rain were estimated when possible. For small gaps the in the hourly data before and after were averaged. For larger gaps regressions were made with the either Toolik Tussock site or Imnaviat data set (a weather station maintained by Hinzman and Kane, Water Research Center, University of Alaska Fairbanks, Fairbanks, AK 99775-5860, which is about 12 kilometers to the east and 200 meters higher).

Reference Citations:

VAPOR PRESS 5M:
Daily average of
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).
PYR J CM2 : Daily sum of PYRANOMETER * 0.3600 jcm2 * 1000 Watt/Kwatt
QUANTUM Mol/m2: (Daily sum of Quantum)*60sec*60 min* 10^-6 umol/mol

Sampling Description.

Estimate of 1 meter from Imnavait 1 meter: Using a regress between Imnavait 1M to estimate AT TEMP 1M Estimate of 5 meter from Imnavait 1 meter: Using a regress between Imnavait 1M to estimate AT TEMP 5M Imnavait data (68o37'N 149o17'W) 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 text        
DATE Date datetime   dd-mmm-yyyy    
Month Month of collection datetime   mmm    
ID Datalogger program step. number number     #N/A=Missing or Not Measured
JULIAN Julian date datetime   ddd    
Rain Total daily rain number millimeter     #N/A=Missing or Not Measured
AT 1M Daily average Air temperature at 1 number celsius     #N/A=Missing or Not Measured
AT 5M Daily average Air temperature at 5 number celsius     #N/A=Missing or Not Measured
ATMAX 1M Maximum temperature at 1 meter number celsius     #N/A=Missing or Not Measured
ATMAX HR 1M Time of maximum air temperature at 1 meters 2400 datetime   hhmm   #N/A=Missing or Not Measured
ATMAX 5M Maximum air temperature at 5 meter number celsius     #N/A=Missing or Not Measured
ATMAX HR 5M Time of maximum air temperature at 5 meters 2400 datetime   hhmm   #N/A=Missing or Not Measured
ATMIN 1M Minimum air temperature at 1 meter number celsius     #N/A=Missing or Not Measured
ATMIN HR 1M Time of minimum air temperature at 1 meter 2400 datetime   hhmm   #N/A=Missing or Not Measured
ATMIN 5M Minimum air temperature at 5 meters number celsius     #N/A=Missing or Not Measured
ATMIN HR 5M Time of minimum air temperature at 5 meter 2400 datetime   hhmm   #N/A=Missing or Not Measured
WSMAX 1M Wind Speed Maximum at 1 meter number meterPerSecond     #N/A=Missing or Not Measured
WSMAX HR 1M Time of wind speed Max at 1M datetime   hhmm   #N/A=Missing or Not Measured
WSMAX 5M Wind Speed Maximum at 5 meter number meterPerSecond     #N/A=Missing or Not Measured
WSMAX HR 5M Time of wind speed Max at 5M datetime   hhmm   #N/A=Missing or Not Measured
WIND SP 1M Daily average wind speed at 1 meter number meterPerSecond     #N/A=Missing or Not Measured
WIND SP 5M Daily average wind speed at 5 meter number meterPerSecond     #N/A=Missing or Not Measured
Vapor Press Avg. Vapor Pressure at 5 meters number millibar     #N/A=Missing or Not Measured
Pyr j/cm2 Total joules per sq cm per day number joulePerCentimeterSquaredPerDay     #N/A=Missing or Not Measured
Quantum Mol/m2/day Photosynthetical Active Radiation number molePerMeterSquaredPerDay     #N/A=Missing or Not Measured
Soil1 Moss Avg. Soil moss layer temperature - set 1 Celsius number celsius     #N/A=Missing or Not Measured
Soil1 5cm Avg. Soil temperature at 5 cm - set 1 Celsius number celsius     #N/A=Missing or Not Measured
Soil1 10cm Avg. Soil temperature at 10 cm - set 1 Celsius number celsius     #N/A=Missing or Not Measured
Soil1 20cm Avg. Soil temperature at 20 cm - set 1 Celsius number celsius     #N/A=Missing or Not Measured
Soil1 50cm Avg. Soil temperature at 50 cm - set 1 Celsius number celsius     #N/A=Missing or Not Measured
Soil1 100cm Avg. Soil temperature at 100 cm - set 1 Celsius number celsius     #N/A=Missing or Not Measured
Soil1 150cm Avg. Soil temperature at 150 cm - set 1 Celsius number celsius     #N/A=Missing or Not Measured
Lake Temp Avg. Lake water temperature at approx. 2 meter number celsius     #N/A=Missing or Not Measured
Comments Comments on individual data points text        
FrostFreeDays Frost free days number number     #N/A=Missing or Not Measured
Pyr w/winter (MJ/m2/day) Sensor measures global solar radiation (sun plus sky). MJ/m2/day Winter months include so values must be used qualitatively since the sensor is not cleared of snow or frost. number joulePerCentimeterSquaredPerDay     #N/A=Missing or Not Measured
Estimate of 1 meter from Imnavait 1 meter Estimate of 1 meter from Imnavait 1 meter number celsius     #N/A=Missing or Not Measured
Estimate of 5 meter from Imnavait 1 meter Estimate of 5 meter from Imnavait 1 meter number celsius     #N/A=Missing or Not Measured
Soil2 Moss Avg. Soil moss layer temperature - set 1 Celsius number celsius     #N/A=Missing or Not Measured
Soil2 20cm Avg. Soil temperature at 20 cm - set 1 Celsius number celsius     #N/A=Missing or Not Measured
Soil2 50cm Avg. Soil temperature at 50 cm - set 1 Celsius number celsius     #N/A=Missing or Not Measured
Soil2 100cm Avg. Soil temperature at 100 cm - set 1 Celsius number celsius     #N/A=Missing or Not Measured

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