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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.

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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:2010dltlh.01
Dataset Title:Hourly weather data from Toolik Field 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:930 Koyukuk Dr.
City:Fairbanks
State:AK
Zip Code:99775
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 3 and 5 meters, wind speed at 3 and 5 meters, wind direction at 5 meters, global solar radiation, photosynthetically active radiation, 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.10276&urlTail=weather/tl/data/2010dltlh.csv
Data File Name 2010dltlh.csv
Beginning Date 1/1/2010
End Date 12/31/2010
Number of Data Records 8760
Other Files to Reference
Availability Status 1
Quality Control Information
Maintenance Description
Log of Changes: Updated Metadata sheet
 
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 Was the ARC LTER Toolik Main weather station. 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/Sampling Description:
The Arctic LTER has collected weather data at Toolik Lake 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, 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 yyyyDLTLH.DAT, the three hourly data are in yyyyDLTLO.DAT, and daily summaries are in yyyyDLTLD.DAT. A second Campbell 21x data logger 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 yyyyDLTDAT.ZIP, which is archived at The Marine Biological Lab, Woods Hole, MA.

Notes and Comments:
Wind Speeds less than .447 are considered calm. 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. August 1998 August 2006 the tipping rain gage was fitted with a Campbell CS705 adapter for measuring snow. A Wyoming windshield was build for the precipitation gage 30Aug99. In August 2006 a OTT Pluvio Precipitation Gauge. (Standard with a heating ring. Resolution: 0.01/0.1; Collecting area 200 cm2; Total quantity 250 mm) replaced the tipping rain gauge/CS705 adapter.

On 12June2006 replace the Vaisala barometer with a Setra 278 Barometric Pressure Sensor. Changed Barometric output from mmHg to millibar for all of 2006 to present .

The Temperature /RH sensor (CampbellCS500) only records to -39 C and there is greater error below -35 C. The Thermocouples(TC) are used to correct for temperatures below -35 C. A regression is used since the TC are slightly different.
In October 2007 the program was changed to correct the reference temperature for measuring thermocouples. A polynomial was fitted against the output temperatures vs. real temperatures for temperatures below zero. See Campbell 107 manual. A subroutine is used to apply the polynomial when temperatures are below 0 C.

On August 19-20, 2008 - the weather station underwent an upgrade to the main data logger to a Campbell CR3000. Wind speed at 1 m was removed; Wind speed at 5m was replaced Vaisala HMP45C. 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.

NOTE:!!! ************************

There appears to be an offset between the Vaisala at 5 meters and the RMYoung Temperature at 3 meters. This still needs more testing.

All wind directions after August 19th were deleted. There was programming error where the wind direction was only sampled once an hour. This was not corrected until summer 2010.
Wind speeds from Moist acidic station could be used instead.

Additional comments from J. Cherry:
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. Data Delete

Program change to correctly calculate the wind vector. Previously the program statement had wind speed entered twice instead of wind speed and wind direction. Jim L
Reprogrammed the barometric pressure to a double storage to increase precision.
Corrected rain_mm since the program is assuming the tip = .01 mm but it is .1mm

See additional notes under Comments variable.

CALCULATIONS
variable Formula
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 HR: PYRANOMETER * 0.3600 jcm2 * 1000 Watt/Kwatt

Data Table

Variable Name Variable Description Data Type Units DateTime Format Code Information Missing Value Code
TIMESTAMP Date and time of collection in Alaska standard time zone (no daylight saving times) datetime   dd-mmm-yyyy hh24:mi   #N/A=Missing or Not Measured
Year Year in yyyy datetime   yyyy   #N/A=Missing or Not Measured
Month Month of collection datetime   mm   #N/A=Missing or Not Measured
DOM Day of Month number number     #N/A=Missing or Not Measured
Hour Time in Alaska standard time datetime   hh24   #N/A=Missing or Not Measured
Batt_Volt_Avg Logger battery voltage number volt     #N/A=Missing or Not Measured
SolarkW_Avg Sun + sky radiation (LI-200SB) number kilowattPerMeterSquared     #N/A=Missing or Not Measured
LakeQuant_Avg QUANTUM Lake quantum sensor number micromolePerMeterSquaredPerSecond     #N/A=Missing or Not Measured
Quant_Avg Quantum sensor number micromolePerMeterSquaredPerSecond     #N/A=Missing or Not Measured
UVA_YES_Avg UV A in watts per meter squared number wattPerMeterSquared     #N/A=Missing or Not Measured
UVB_YES_Avg UV B in watts per meter squared number wattPerMeterSquared     #N/A=Missing or Not Measured
Press_mBar Barometer readings mbar number millibar     #N/A=Missing or Not Measured
AirTemp_3m_Avg Air temp at 3 meters in number celsius     #N/A=Missing or Not Measured
RH_3m_Avg Relative humidity at 3 meters number percent     #N/A=Missing or Not Measured
AirTemp_5m_Avg Air temp at 5 meters in number celsius     #N/A=Missing or Not Measured
RH_5m_Avg Relative humidity at 5 meters number percent     #N/A=Missing or Not Measured
Wind_Speed_5M_mean Wind Speed at 5 meters in number meterPerSecond     #N/A=Missing or Not Measured
Wind_direction_5M_mean Wind direction at 5 meters number degree     #N/A=Missing or Not Measured
Std_wind_dir Wind direction standard deviation at 5 meters number degree     #N/A=Missing or Not Measured
Precipitation Rainfall On 17Aug2006 a OTT Pluvio Precipitation Gauge (Standard with a heating ring. Resolution: 0.01/0.1; Collecting area 200 cm2 was installed number millimeter     #N/A=Missing or Not Measured
Rain2_mm_Tot precipitation measured by a tipping rain bucket. Only unfrozen precipitation. number millimeter     #N/A=Missing or Not Measured
Comments Comments on individual data points text        
Please contact arc_im@mbl.edu with questions, comments, or for technical assistance regarding this web site.