Arctic LTER

Weather at Toolik

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:

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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.

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Dataset URLs:	METADATA: HTML, Rich Text, XML(EML compliant) DATA: Comma Delimited, Excel file with Metadata and data
Dataset ID:	1998_present_dltusoil10cm.2
Dataset Title:	Daily summary of 10 cm soil temperatures in the Arctic LTER moist acidic experimental plots from 1998 to present, Toolik Lake Field Station, Alaska.
Investigator 1:
First Name:	Gus
Last Name:	Shaver
Organization:	Marine Biological Lab
Address line 2:	The Ecosystems Center
Address line 3:	7 MBL St.
City:	Woods Hole
State:	MA
Zip Code:	02543
Country:	USA
Associate Investigators:
Keywords:	Soil temperature, fertilization, arctic tundra, soil warming
Abstract:	Daily summary of 10 cm soil temperatures in the Arctic LTER moist acidic experimental plots for the control (CT), greenhouse (GH), greenhouse plus nitrogen and phosphorus (GHNP) and nitrogen and phosphorus (NP) plots. Soil temperature probes in the tundra soil were problematic with frost heaving causing the depth of measurements to change. In order to provide a consistent year to year temperature record notes on changes in depths were used to select the temperature sensor that was within + or – 3 cm of the 10 cm and then averaged daily.
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.1608&urlTail=weather/tu/data/1998_present_dltusoil10cm.csv
Data File Name	1998_present_dltusoil10cm
Beginning Date	8/1/1998
End Date	9/5/2005
Number of Data Records	2164
Other Files to Reference
Availability Status	1
Quality Control Information
Maintenance Description	Data updated yearly
Log of Changes:	Jan2006 completed metadata and data up to aug2005. JimL
	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: Metadata updated to newer form (with sites sheet). 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 acidic 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 21x data logger in the Arctic LTER moist acidic experimental plots (block 2) is used to monitor weather and soil temperatures. Two profiles of soil temperature are measured per treatment plot with copper/constantan 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, NP = fertilized, GNP= greenhouse fertilized, SNP = 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. Other sensors include: global solar radiation, photosynthetic active radiation, unfrozen precipitation, air temperature, relative humidity, wind speed, and wind direction at 3 meters. The fertilizer treatment is applied every year in early June at the rate of 10 gram per meter nitrogen and 5 grams per meter as phosphorus using commercial grade fertilizers, i.e. 34 - 0 – 0 equal 34% nitrogen and 0 - 45 - 0 equals 45% P2O5 (19.89%P). The greenhouse covers are removed every fall around 20 August and reinstalled every spring in early June. This file is includes only a daily summary of the 10 cm soil temperature for the control (CT), greenhouse (GH), greenhouse plus nitrogen and phosphorus (GHNP) and nitrogen and phosphorus (NP) plots. Soil temperature probes were problematic since frost heaving of the probes caused depth of measurements to change. Most of the depth changes seem to occur it spring. In August 1998 all profiles were reset using a white fiberglass pole anchored approximately 75 cm into the permafrost. Some probes stilled heaved. In order to provide a consistent year to year temperature record notes on changes in depths were used to select the temperature sensor that was within + or – 3 cm of the 10 cm. The probe used is noted in the “rep used” variable. In some cases there was no suitable sensor probe. Only data from August 1998 to present are used since the previous profiles included one rep each in a tussock and non-tussock micro-site. In addition there are incomplete notes on the movement of the probes.

Data Table

Variable Name	Variable Description	Data Type	Units	DateTime Format	Code Information	Missing Value Code
Year	Year of measurement.	datetime		yyyy
Month	Month and year of measurement	datetime		mmm-yyyy
Date	Date of measurement.	datetime		dd-mmm-yyyy
CT 10 cm +- 3cm	Control soil temperature at 10 plus or minus 3 cm. Since the probes sometimes changed depth with frost heaving only data with probes within 3 cm of 10 cm of soil surface were used.	number	celsius			#N/A=Missing or Not Measured
CT rep used	The control temperature probe used for the daily average. In the original data logger files the 10 cm probes are labeled CT1 10 cm and CT2 10 cm.	text
GH 10cm +- 3cm	Greenhouse soil temperature at 10 cm plus or minus 3 cm. Since the probes sometimes changed depth with frost heaving only data with probes within 3 cm of 10 cm of soil surface were used.	number	celsius			#N/A=Missing or Not Measured
GH rep used	The Greenhouse temperature probe used for the daily average. In the original data logger files the 10 cm probes are labeled GH1 10 cm and GH2 10 cm.	text
GHNP 10cm +- 3cm	Greenhouse NP soil temperature at 10 cm plus or minus 3 cm. Since the probes sometimes changed depth with frost heaving only data with probes within 3 cm of 10 cm of soil surface were used.	number	celsius			#N/A=Missing or Not Measured
GHNP rep used	The greenhouse NP temperature probe used for the daily average. In the original data logger files the 10 cm probes are labeled GHNP 10 cm and GHNP2 20 cm. There is no GHNP 10 cm.	text
NP 10cm +- 3 cm	Control soil temperature at 10 cm plus or minus 3 cm. Since the probes sometimes changed depth with frost heaving only data with probes within 3 cm of 10 cm of soil surface were used.	number	celsius			#N/A=Missing or Not Measured
NP rep used	The NP (fertilized) temperature probe used for the daily average. In the original data logger files the 10 cm probes are labeled NP1 10 cm and NP2 10 cm.	text

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