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:	2002dltud.3
Dataset Title:	Daily weather and soil temperature data from the Toolik Tussock Experimental plots, Arctic LTER 2002.
Investigator 1:
First Name:	Gus
Last Name:	Shaver
Organization:	Marine Biological Laboratory
Address line 2:	The Ecosystems Center
Address line 3:	7 MBL center
City:	Woods Hole
State:	MA
Zip Code:	02543
Country:	USA
Investigator 2:
First Name:	Jim
Last Name:	Laundre
Organization:	Marine Biological Laboratory
Address line 2:	The Ecosystems Center
Address line 3:	7 MBL center
City:	Woods Hole
State:	MA
Zip Code:	02543
Country:	USA
Associate Investigators:
Keywords:	weather, air temperature, relative humidity, soil temperature, radiation, wind
Abstract:	Daily weather and soil temperature data from the Toolik Tussock Experimental plots. In 1990 a Campbell CR21X datalogger was installed in block 2 of the Toolik LTER experimental tussock plots. The plots are located on a hillside near Toolik Lake (68 38' N, 149 36'W). Sensors were placed in a control, fertilized, greenhouse, greenhouse fertilized, shade house and shade house fertilized plots.
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.1545&urlTail=weather/tu/data/2002dltud.csv
Data File Name	2002dltud
Beginning Date	5/1/2002
End Date	9/1/2002
Number of Data Records	242
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes:	Log of changes: For Archival Use: DATE RECEIVED: 2May2002 DATA FILE ENTERED BY: J.Laundre DATA FILE VALIDATION: 2Feb2003 NAME:JL DATE:
	Version 3: Metadata updated to newer form (with sites sheet). Units updated to current standards. Discrepancy with variable names fixed. CH April 2013.

RESEARCH LOCATION:
Location Name	LTER Moist Acidic Tussock Tundra	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	Toolik Lake Field Station (68 38' N, 149 36'W), LTER tussock site on hill south of Toolik Lake, 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	68.624411	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees
Longitude	-149.609589	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees
Elevation	750	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:	A Campbell CR21x datalogger, in the LTER acidic experimental plots (block 2), is used to monitor weather and soil temperatures. Sensors in the control plot include: global solar radiation, photosynthetically active radiation, unfrozen precipitation, air temperature, relative humidity, wind speed, and wind direction at 3 meters. Additional seasons in greenhouses and shade houses plots measure air temperature, relative humidity and photosynthetically active radiation during the growing season. These sensors are read every minute and averaged or totaled every hour. Two profiles of soil temperature are measured per treatment plot with copper/constantin thermocouple wires (TC) installed at depths of 10, 20, and 40 cm in inter-tussock areas. The following label codes are used: CT = control, GH = greenhouses, SH = shade houses, F = fertilized, GF= greenhouse fertilized, SF = shade house fertilized, plus a 1 or a 2 for the profile number. All soil sensors are read every 15 minutes and averaged every 3 hours. Hourly, three hourly and daily summaries are in files yyDLTUH.DAT, yyDLTUO.DAT, and yDLTUD.DAT respectively, where yy is the year in which the data are collected. The original data are in file yyDLTDAT.ZIP which is archived at The Marine Biological Lab, Woods Hole, MA. Note: The covers on greenhouses and shade houses are removed every fall and reinstalled every spring. Notes: Only unfrozen precipitation is reported. Soil temperatures are problematic since frost heaving of the probes caused depth of measurements to change. Depth changes and whether the TCs are reset are noted in the Comment variable. Most frost heaving may occur it spring. In August 1998 all profiles were reset using a white fiberglass pole anchored approximately 75 cm in to the permafrost. Replicates were installed in average non-tussock microsites. In January, February and December there are some erratic soil temperatures that are unexplained. From late June to late July the connection to the multiplexer failed resulting in no soil temperatures for that period. 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. Missing values are indicated by #N/A Reference Citations: Buck, A.L. 1981 New equations for computing vapor pressure and enhancement factor. Journal of Applied Meteorology 20:1527-1532. Sampling Description. VAPOR PRESS : 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)) PYR TOTAL CM2 HOUR: 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	datetime		YYYY
DATE	Date	datetime		DD-MMM-YYYY
MONTH	Month	text
ID	Program step that output the data	text
JULIAN	Julian Date	datetime		ddd
Rain mm	Total daily unfrozen rain	datetime		mm
CT TEMP 3M	Daily average air temperature at 3meter Celsius	text
MAX CT TEMP 3M	Maximum temperature at 3 meter	number	celsius			#N/A=Missing or Not Measured
MAX HOUR CT TEMP 3M	Time of air temperature max at 3 meters	datetime		hhmm
MAX WIND SPEED 3M	Wind Speed Maximum at 3 meter	number	meterPerSecond			#N/A=Missing or Not Measured
MAX HOUR WIND SP	Time of wind speed Max at 3M	datetime		hhmm
MIN CT TEMP 3M	Minimum air temperature at 3 meter	number	celsius			#N/A=Missing or Not Measured
MIN HOUR CT TEMP 3M	Time of air temperature min at 3 meter	datetime		hhmm
WIND SPEED 3M m/s	Daily average wind speed at 3 meter	number	meterPerSecond			#N/A=Missing or Not Measured
GH TEMP	Daily greenhouse air temperature Celsius	text
SH TEMP	Daily shade house air temperature Celsius	text
CT Quantum	mol/m2/day Control Quatnum radiation in moles per meter sq. per day	number	molePerMeterSquaredPerDay			#N/A=Missing or Not Measured
GH Quantum	Greenhouse Quatnum radiation in moles per meter sq. per day (mol/m2/day)	number	molePerMeterSquaredPerDay			#N/A=Missing or Not Measured
SH Quantum	Shade house Quatnum radiation in moles per meter sq. per day (mol/m2/day)	number	molePerMeterSquaredPerDay			#N/A=Missing or Not Measured
VAPOR PRESS	Avg. Vapor Pressure at 3 meters	number	millibar			#N/A=Missing or Not Measured
PYR J CM2 DAY	Total joules per sq cm per day	number	joulePerCentimeterSquaredPerDay			#N/A=Missing or Not Measured
CT1 10cm	Set 1 daily average soil temperature at 10cm	number	celsius			#N/A=Missing or Not Measured
CT1 20cm	Set 1 daily average soil temperature at 20cm	number	celsius			#N/A=Missing or Not Measured
CT1 40cm	Set 1 daily average soil temperature at 39cm	number	celsius			#N/A=Missing or Not Measured
CT2 10cm	Set 2 daily average soil temperature at 10cm	number	celsius			#N/A=Missing or Not Measured
CT2 20cm	Set 2 daily average soil temperature at 20cm	number	celsius			#N/A=Missing or Not Measured
CT2 40cm	Set 2 daily average soil temperature at 40cm	number	celsius			#N/A=Missing or Not Measured
COMMENTS	Comments about individual datum points.	text

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