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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 via LTER Data Poral
Dataset ID:2009dltld.02
Dataset Title:Daily weather summaries from Toolik Field Station Meteorological Station, Toolik Lake, Alaska for 2009.
Investigator 1: 
First Name:Gus
Last Name:Shaver
Organization:7 MBL St.
Address line 2:
Address line 3:
City:Woods Hole
State:MA
Zip Code:02543
Country:USA
Investigator 2: 
First Name:Jim
Last Name:Laundre
Organization:7 MBL St.
City:Woods Hole
State:MA
Zip Code:02543
Country:USA
Investigator 3: 
First Name:Jessica
Last Name:Cherry
Organization:International Arctic Research Center
City:Fairbanks
State:AK
Zip Code:99775
Country:USA
Investigator 4: 
First Name:Christie
Last Name:Haupert
Organization:
Address line 2:
Address line 3:
City:
State:
Zip Code:
Country:
Associate Investigators:
Keywords:weather, temperature, wind, rain
Abstract:Daily weather summaries from Toolik Field Station Meteorological Station, Toolik Lake, Alaska. 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 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.10275&urlTail=weather/tl/data/2009dltld.csv
Data File Name 2009dltld.dat
Beginning Date 1/2/2013
End Date 1/1/2014
Number of Data Records 365
Other Files to Reference
Availability Status type 1
Quality Control Information
Maintenance Description
Log of Changes: Changes to past form denoted below in comments section.
Version 2: 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 Coords in WGS84(ITRF00 - Ep. 1997.0) Accuracy should be good to ~ 90cm 68.628228973N, 149.596001285W, Height (above ellipsoid) is 726.5m, give or take ~1.5m 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:EXPERIMENTAL DESIGN AND METHODS: Weather data at Toolik Lake has been collected by the Arctic LTER since June 1988. The station is located about 50 meters south of the lake's edge in a sedge/moss (Tomenthypnum nitens-Carex bigelowii) vegetation. 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, barometric pressure, and 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. Pan evaporation are only measured during the summer months. The hourly data are in the file yyyyDLTLH.DAT, the three hourly data are in yyyyDLTLO.DAT, and daily summaries are in yyyyDLTLD.DAT.
A second datalogger, Toolik Moist Acidic Tussock station, 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 Imnavait weather station, 12 kilometers away and 200 meters higher, is also used to fill in data gaps. Regressions of summer air temperature between Imnavait and with Toolik are good but during the winter months there is greater variability. This station is maintained by Larry Hinzman and Doug Kane, Water Research Center; University of Alaska Fairbanks; Fairbanks, AK 99775-5860. Precipitation data from the Natural Resources Conservation Service (NRCS) Alaska Imnavait weather station is also used to fill in the data gaps. Please contact Rick McClure, Data Collection Officer, Natural Resources Conservation Service, 949 E. 36th Ave., Suite 400,, Anchorage, AK 99508-4362, (907) 271-2424 for more details.
The full description of the sensors and site is in file SENSORS.DOC. The original data is in file yyyyDLTDAT.ZIP which is archived at The Marine Biological Lab, Woods Hole, MA.

NOTES AND COMMENTS: Wind speed less than .447 is considered calm.
Radiation data were not totaled for the winter months since no attempt was made to keep sensors snow and frost-free. Lake temperature is measured at the lake depth sensor. Therefore the lake depth measurements give the depth at which lake temperature is measured. See additional notes under Comments variable.


On August 19-20, 2008 - the weather station underwent an upgrade to the main datalogger: CR3000. Wind speed at 1 m was removed. Wind speed at 5m was replaced w/ calibrated sensor. Pyranometer was replaced w/ Kipp and Zonen CMP6 (ventilation unit - year round numbers are now available). Temperature/RH at 1 m was removed and replaced w/ an RMYoung T/RH probe at 3 m.

Wind speed data from Jan 1, 2009-April 19, 2009 is suspect.

Winter precipitation (precip when temp < approx 1 C) is always suspect. False precipitation events are common in winter.

5 minute data are missing from Jan 1-April 19, 2009.
Changes relative to form from past years: 'Rain' changed to 'precipitation' and the gauge reported is only the Pluvio one. 'AT' variable changed to 'ATAVG' to reflect accuracy. 'WSMin' Added. 'Wind SP 5m' changed to 'WSAVG' for consistency. Data missing from 4/14 through 4/19 during logger change out. Some parameters changed with new logger (see methods). Data processed on a MacBook Pro running OS 10.5.8 and MSOffice 2008.

Data Table

Variable Name Variable Description Data Type Units DateTime Format Code Information Missing Value Code
DATE Date and time data collected datetime   dd-mmm-yyyy hh24:mi    
Month Month of collection datetime   mm    
YEAR Year data collected number number      
DAY OF YEAR Count of days since Jan 1 number number      
PRECIP Since 17Aug2006 a OTT Pluvio Precipitation Gauge (Standard with a heating ring. Resolution: 0.01/0.1; Collecting area 200 cm2; Total quanity 250 mm) A Wyoming wind shield surrounds the gauge. number millimeter     #N/A=Missing or Not Measured
ATAVG 3M Air temp at 3 meters number celsius     #N/A=Missing or Not Measured
ATAVG 5M Air temp at 5 meters number celsius     #N/A=Missing or Not Measured
ATMAX 3M Daily maximum from readings taken every minute for air temperature at 3 meter. number celsius     #N/A=Missing or Not Measured
ATMAX HR 3M The hour at which the maximum occurred. datetime   dd-mmm-yyyy hh24:mi   #N/A=Missing or Not Measured
ATMAX 5M Daily maximum from readings taken every minute for air temperature at 5 meters. number celsius     #N/A=Missing or Not Measured
ATMAX HR 5M The hour at which the maximum occurred. datetime   dd-mmm-yyyy hh24:mi   #N/A=Missing or Not Measured
ATMIN 3M Daily minimum from readings taken every minute for air temperature at 3 meter. number celsius     #N/A=Missing or Not Measured
ATMIN HR 3M The hour at which the minimum occurred. datetime   dd-mmm-yyyy hh24:mi   #N/A=Missing or Not Measured
ATMIN 5M Daily minimum from readings taken every minute for air temperature at 5 meters. number celsius     #N/A=Missing or Not Measured
ATMIN HR 5M The hour at which the minimum occurred. datetime   dd-mmm-yyyy hh24:mi   #N/A=Missing or Not Measured
WSMAX 5M Maximum wind speed, using the minute reading, at 5 meters using a MET-ONE, (supplied by Campbell Scientific) Wind speed sensor Model 014A in meter per second. number meterPerSecond     #N/A=Missing or Not Measured
WSMAX HR 5M The hour at which the maximum occurred. datetime   dd-mmm-yyyy hh24:mi   #N/A=Missing or Not Measured
WSMIN 5M Minimum wind speed, using the minute reading, at 5 meters using a MET-ONE, (supplied by Campbell Scientific) Wind speed sensor Model 014A in meter per second. number meterPerSecond     #N/A=Missing or Not Measured
Comments Comments on individual records text        

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