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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.
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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 via LTER Data Poral
Dataset ID:2011-2012_nb_snowcover_3sites.01
Dataset Title:Daily landscape-level snow cover percent data from (Rich, et al 2013) TLFS, IMVT, and SDOT sitse, in the northern foothills of the Brooks Range, Alaska,spring 2011 to 2012.
Investigator 1: 
First Name:Natalie
Last Name:Boelman
Organization:Lamont-Doherty Earth Observatory and Department of Earth and Environmental Sciences,
Address line 2:Columbia University
Address line 3:61 Route 9W
City:Palisades
State: NY
Zip Code:10964
Country:USA
Investigator 2: 
First Name:Shannan
Last Name:Sweet
Organization:Lamont-Doherty Earth Observatory and Department of Earth and Environmental Sciences,
Address line 2:Columbia University
Address line 3:61 Route 9W
City:Palisades
State: NY
Zip Code:10964
Country:USA
Associate Investigators:
Keywords:snowcover, Toolik field station, Sagavanirktok river, Imnavait, snow camera, teambird
Abstract:Daily landscape-level snow cover percent data from Toolik Lake Field Station (TFS), Imnavait (IMVT), and the Sagavanirktok River DOT site (SDOT), in the northern foothills of the Brooks Range, Alaska. Data collected from May to early June 2011 and 2012.
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.10498&urlTail=multi-trophic_impacts/weather/data/2011-2012_nb_snowcover_3sites.csv
Data File Name 2011-2012_nb_snowcover_3sites
Beginning Date 5/12/2011
End Date 6/4/2012
Number of Data Records 192
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes: Metatdata entered and data reviewed by S.Sweet, uploaded and formatted JD (Dec.2013)
 
RESEARCH LOCATION:          
Location Name Toolik Field Station (TFS) Imnavait Creek (IMVT) Sag River Department of Transportation (SDOT) Select Site or enter New One  
Geographic Description Near Toolik Field Station (68 degrees 65N, 149 degrees 58W, elevation ~ 730 m) in the northern foothills of Brook Range, Alaska, U.S.A. Near Imnavait Creek (68 degrees 62N, 149 degrees 30W, elevation ~ 910 m) in the northern foothills of Brook Range, Alaska, U.S.A. Near the Sagavanirktok River (68 degrees 46N, 148 degrees 52W, elevation ~ 510 m) in the northern foothills of Brook Range, Alaska, U.S.A. Enter Description  
Location Bounding Box          
West Bounding Coordinate          
East Bounding Coordinate          
North Bounding Coordinate          
South Bounding Coordinate          
OR if single point location          
Latitude 68.6455515506 68.6200002679 68.764564446 In Decimal Degrees  
Longitude -149.576251046 -149.300313174 -148.90027451 In Decimal Degrees  
Elevation 731.782 911.128 510.33 In Meters  
Link to Google Map View on Google Map View on Google Map View on Google Map    
           
 
TAXONOMIC COVERAGE:
Organisms studied
 
Methods:The Toolik Lake Field Station (TLFS) and Sagavanirktok River-Department of Transportation camp (SDOT) sites were deglaciated ~65,000 yr BP, following the Itkillik I glaciation (Hamilton 2002). The Imnavait Creek (IMVT) site was deglaciated ~120,000 yr BP, following the Sagavanirktok River glaciation (Hamilton 2002). Snow cameras were mounted on tripod assemblages, ~ 5 meters from the ground to capture landscape-level images four times daily in the Shrub plots at each of the four sites. The Shrub plots represent a gradient of shrub statures, with maximum deciduous shrub heights of approximately 22 cm (IMVT), 35 cm (TLFS) and 84 cm (SDOT) (Rich et al. 2013). Differences among Shrub plots are related to topography and water flow. The IMVT Shrub plot, which has the shortest shrubs of the three sites, is associated with water movement because it is located in an area with water tracks, and the site represents vegetation typical of water track tundra as described in Chapin et al. (1988). The TLFS Shrub plot, which has medium stature shrubs, is located at the outlet of Toolik Lake, where proximity to a large body of water, substrate conditions, and the presence of large rocks may promote root lengthening and shrub growth. The TLFS Shrub plot represents vegetation typical of shrub tundra described in Shaver & Chapin (1991). The SDOT Shrub plot, which has tall and structurally complex shrubs, is a riparian community (Rich et al. 2013). The Shrub plot at SDOT has the deepest thaw depths among all of our plots and represents vegetation typical of riverside shrub tundra as described in Giblin et al. (1991), which tend to have deeper thaw depths compared to other tundra vegetation communities (Shaver & Chapin 1991).

Snow cameras are installed in mid-May and digital photos are used to quantify snow cover through the melt period. Cameras rented from SID Inc. are removed and shipped back to SID Inc. once snowmelt in the field of view of the camera is complete (or near complete, <5% snow cover remaining). The photos are taken every day, either once or three times per day, depending on the site and camera being used. The following describes the cameras being used at each field site. The photos show what their field of view should be when set up each year, and the below table gives a summary of which camera(s) was (were) used in which year at each site.

TLFS: We are using two cameras at this field site: (1) the EDCs Brooks Range Camera which is an Axis 206W Wireless Network Camera. The system is permanently mounted inside Winter Quarters and faces south towards the Brooks Mountain Range and takes a photo every day at 12 noon. Field of view of the camera can be seen at the following URL: http://toolik.alaska.edu/edc/daily_images/web_cam_archive.php?camera=brooks); (2) our own camera rented from SID Inc. (NetCam SC, StarDOT Technologies, CA, USA). The camera is mounted at 3.32 m above ground and is located upslope of our Shrub plots at TLFS and takes a photo every day at approximately 6am, 12 noon and 6pm.

IMVT: We are using our own camera rented from SID Inc. (NetCam SC, StarDOT Technologies, CA, USA). The camera is mounted at 3.54 m above ground and is located upslope of our Shrub plots at IMVT and takes a photo every day at approximately 6am, 12 noon and 6pm.

SDOT: We are using our own camera rented from SID Inc. (NetCam SC, StarDOT Technologies, CA, USA). The camera is mounted at 3.32 m above ground and is located south of and adjacent to our Shrub plots at SDOT and takes a photo every day at approximately 6am, 12 noon and 6pm.

Post-processing and analysis of photos was done using ENVI remote sensing software and in Excel, and the fraction of snow cover in each image on each day was calculated: Fraction snow cover = (# snow covered pixels) / (# snow covered pixels + # snow free pixels). This was converted to a percent by multiplying by 100.

Reference Citations:
Chapin, F.S. III, Fetcher, N., Kielland, K., Everett, K.R., and Linkins, A.E., 1988: Productivity and nutrient cycling of Alaskan tundra: enhancement by flowing soil water. Ecology, 69: 693-702.
Giblin, A.E., Nadelhoffer, G.R., Shaver, G.R., Laundre, J.A., and McKerrow, A.J., 1991: Biogeochemical diversity along riverside toposequence in arctic Alaska. Ecological Monographs. 61: 415-435.
Hamilton, T.D., 2002: Glacial geology of Toolik Lake and the Upper Kuparuk River regions. Biological Papers of the University of Alaska. Walker, D.A. (Ed.). Fairbanks, AK: Institute of Arctic Biology, 1-25.
Rich, M.E., Gough, L., and Boelman, N.T., 2013: Arctic arthropod assemblages in habitat of differing shrub dominance. Ecography, 36: 1-10.
Shaver, G.R., and Chapin, F.S. III., 1991: Production: biomass relationships and element cycling in contrasting arctic vegetation types. Ecological Monographs, 61: 1-31.

Data Table

Variable Name Variable Description Data Type Units DateTime Format Code Information Missing Value Code
Site Research site code from Methods above: TLFS = Toolik Lake Field Station Team Bird Camera; TFSEDC = Toolik Field Station EDC Camera; IMVT = Imnavait Creek; SDOT = Sagavanirktok river DOT text        
Year year datetime   yyyy    
Date date datetime   dd-mmm-yyyy    
Snowcover percent snow cover in image (fractional cover * 100) number percent     N/A=Missing or Not Measured
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