Arctic LTER

Weather at Toolik

Arctic LTER Database

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 ID:	2008dltlh.05
Dataset Title:	Hourly weather data from Toolik Field Station, ARC LTER, Alaska for 2008.
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
Investigator 3:
First Name:	Christie
Last Name:	Haupert
Organization:
Address line 2:
Address line 3:
City:
State:
Zip Code:
Country:
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, 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.10022&urlTail=weather/tl/data/2008dltlh.csv
Data File Name	2008dltlh.csv
Beginning Date	1/1/2008
End Date	12/31/2008
Number of Data Records	8784
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes:	Version 1 Received file from Christie Haupert and checked it and put it on the web. Some missing data stills need to be filled in with backup sensors. JimL April 2008
	Version 2: Upadte LTERNET Data Access server proxy link for Excel and comma delimited data files. Changed from knb to das in url.
	Version 3: Delected winter Precipitation. Replaced windirection, updated metadata. See notes in methods. Jim L 27Oct2010
	Version 4: Units for PAR weremicromolePerMeterPerSecondSquared. Should be micromolePerMeterSquaredPerSecond. Jiml 6April11
	Version 5: Updated the form to include site name and to eml 2.1 JimL 3Apr13

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 Viasala at 5 meters and the RMYoung Temperature at 3 meters. This still needs more testing. All wind direction after August 19th was replaced with wind direction from the Moist Acidic site station. There was programming error where the wind direction was only sampled once an hour. This was not corrected until summer 2010. All winter precipitation was deleted. The sensor was recording many false readings during the winter months. Jim Laundre Oct 27, 2010 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
YEAR	Year in yyyy	datetime		yyyy		#N/A=Missing or Not Measured
DATE	Date of collection	datetime		dd-mmm-yyyy hh24:mi		#N/A=Missing or Not Measured
MONTH	Month of collection	datetime		mm		#N/A=Missing or Not Measured
DAYS	Julian plus fraction of day	number	number			#N/A=Missing or Not Measured
ID	Data logger program step	number	number			#N/A=Missing or Not Measured
JULIAN	Julian Day	number	number			#N/A=Missing or Not Measured
HOUR	Time in Alaska standard time	datetime		hh24mi		#N/A=Missing or Not Measured
RAIN	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
PYRANOMETER	Sun + sky radiation (LI-200SB), average PAR over measurement interval	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 3M	Air temp at 3 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	number	percent			#N/A=Missing or Not Measured
RH 3M	Relative humidity at 3 meters	number	percent			#N/A=Missing or Not Measured
RH 5M	Relative humidity at 5 meters	number	percent			#N/A=Missing or Not Measured
BAROMETER	Barometer readings mbar	number	millibar			#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)	number	celsius			#N/A=Missing or Not Measured
AIR TC 5M	Air temp at 5 meter, (thermocouple)	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	Vapor Pressure at 5 meters	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 in 45 degree sectors	text				#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.