1990_present_TW_Thaw_Kling.06 George Kling

University of Michigan Department of Ecology and Evolutionary Biology 830 North University Ann Arbor MI 48109-1048 United States of America

Arctic LTER Program

The Ecosystems Center Marine Biological Lab 7 MBL St Woods Hole MA 02543 USA

(508) 289 7496 arc_im@mbl.edu http://ecosystems.mbl.edu/ARC/ Chris Wallace

Associated Researcher Amanda Field

Associated Researcher Jim Laundre

Associated Researcher 2007 Starting in 1990 thaw depth has been measured in a small watershed of tussock tundra every July 2nd and August 11th. The UTM stake grid (stakes are in a grid at every 100 meters) was used to locate the points . All measured depths are in cm. Measurements are made within a 20 cm radius of each location point. All the measurements are then averaged into a single value for the day. Toolik Lake tussock tundra thaw depth permafrost Acceptance and utilization of LTER data requires that: The Principal Investigator be sent a notice stating reasons for acquiring any data and a description of the publication intentions. The Principal Investigator of the data set be sent a copy of the report or manuscript prior to submission and be adequately cited in any resultant publications A copy of any resultant publications should be sent to: Principal Investigator Ecosystems Center Marine Biological Laboratory Woods Hole, MA 02543 http://ecosystems.mbl.edu/ARC/meta_template.php?FileName=./landwater/soils/1990_present_TW_Thaw_Kling.html Tussock Watershed is a small inlet stream approximately 500 meters south of Toolik Lake (southwest of Toolik Field Station) that flows into Toolik Lake (approximately 68º 30' N, 149º 15'W). -149.6173 -149.6173 68.62356 68.62356 1990-07-02 2009-08-11 Entered metadata into new metadata form. Version 3: LTERNET Data Access server proxy changed from das.lternet.edu to metacat.lternet.edu. Version 4: Added LTERNET Data Access server proxy for Excel files. 1/26/2010 - JMK Added 2007-2009 data Version 5: Update LTERNET Data Access server proxy link for Excel and comma delimited data files. Changed from knb to das in url. Feb 210 JimL Version 6: Corrected the Methods since it was the Imnavait Creek method. Changed the Title… to present, Updated the form to the new version. Jim L 22Aug11 Data Manager

The Ecosystems Center Marine Biological Lab 7 MBL St Woods Hole MA 02543 USA

(508) 289 7496 arc_im@mbl.edu http://ecosystems.mbl.edu/ARC/ ARC LTER

The Ecosystems Center Marine Biological Lab 7 MBL St Woods Hole MA 02543 USA

(508) 289 7496 arc_im@mbl.edu http://ecosystems.mbl.edu/ARC/ Sampling Description: Starting in 1990 thaw depth has been measured in a small watershed of tussock tundra every July 2nd and August 11th. The UTM stake grid (stakes are in a grid at every 100 meters) was used to locate the points. A ruled stainless steel rod was inserted in non tussock microhabitat until the frozen layer was reached, and the distance was measured to the top of the organic mat (beneath the uppermost moss). Two measurement were made at each point from 1990-1999, and three measurements were made at each point from 2000 on. All measured depths are in cm. Measurements are made within a 20 cm radius of each location point. All the measurements are then averaged into a single value for the day. pers-1 http://ecosystems.mbl.edu/arc/landwater/lw_protocols.html John Hobbie

The Ecosystems Center Marine Biological Lab 7 MBL St Woods Hole MA 02543 USA

(508) 289 7496 jhobbie@mbl.edu Lead PI Gus Shaver

The Ecosystems Center Marine Biological Lab 7 MBL St Woods Hole MA 02543 USA

(508) 289 7496 gshaver@mbl.edu Lead PI Jim Laundre

The Ecosystems Center Marine Biological Lab 7 MBL St Woods Hole MA 02543 USA

(508) 289 7496 arc_imr@mbl.edu Information Manager The goal of Arctic LTER project is to predict the future ecological characteristics of the site based upon our knowledge of the controls of ecosystem structure and function as exerted by physical setting and geologic factors, climatic factors, biotic factors, and the changes in fluxes of water and materials from land to water. To achieve this goal the Arctic LTER uses several approaches: Long-term monitoring and surveys of natural variation of ecosystem characteristics in space and time. Includes: climate, plant communities and productivity, thaw depth, stream flow, chemistry of streams and lakes, temperatures of streams and lakes, lake chlorophyll lake productivity, zooplankton abundance. Experimental manipulation of ecosystems for years and decades. Includes: tundra warming, shading, and fertilizing, grazer exclusions, fertilization of lakes and streams, addition and subtraction of predators. Synthesis of results and predictive modeling at ecosystem and watershed scales. Includes: stream N cycling, lake physics, bioenergetics of fish populations, water movement and transfer of DOC and nutrients from land to water, soil respiration, cycling and storage of C in tundra under different scenarios of future climates. 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. Any opinions, findings, conclusions, or recommendations expressed in the material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. The Arctic LTER research site (68°N and 149°W) is in the foothills region of the North Slope of Alaska and includes the entire Toolik Lake watershed and the adjacent watershed of the upper Kuparuk River, down to the confluence of these two watersheds. This area is typical of the northern foothills of the Brooks Range, with continuous permafrost, no trees, a complete snow cover for 7 to 9 months, winter ice cover on lakes, streams, and ocean, and cessation of river flow during the winter. Tussock tundra vegetation of sedges and grasses mixed with dwarf birch and low willows form the dominant vegetation type with areas of drier heath tundra on ridge tops and other well-drained sites as well as areas of river-bottom willow communities. -149.75 -149.0433 68.8 68.5 610 1360 meter uid=ARC,o=lter,dc=ecoinformatics,dc=org all public read 1990_present_TW_Thaw_Kling.csv Tussock Watershed Thaw Depth Survey Summary for 1990 to present, Arctic LTER, Toolik Research Station, Alaska. 1990_present_TW_Thaw_Kling.csv 1 column , http://metacat.lternet.edu/das/dataAccessServlet?docid=knb-lter-arc.1019&urlTail=landwater/soils/data/1990_present_TW_Thaw_Kling.csv Date Date Day, Month, and Year that sample was taken ddmmmyyyy . Calendar_Day Calendar_Day Day of Year nominalDay real . Mean Mean Average Thaw Depth for the Sampling centimeter real . Standard_Devation Standard_Devation Standard Deviation of Thaw Depth for the Sampling centimeter real . Standard_Error Standard_Error Standard Error of Thaw Depth for the Sampling centimeter real . N N Number of Measurements in the Sampling centimeter real . Minimum Minimum Minimum Thaw Depth for the Sampling centimeter real . Maximum Maximum Maximum Thaw Depth for the Sampling centimeter real . %CV %CV Coeffiecent of Variation percent real . 1990_present_TW_Thaw_Kling.xls An excel file that has worksheets with the metadata and data. 1990_present_TW_Thaw_Kling.xls Microsoft Excel http://metacat.lternet.edu/das/dataAccessServlet?docid=knb-lter-arc.1019&urlTail=landwater/soils/xlsfiles/1990_present_TW_Thaw_Kling.xls Microsoft Excel file ratio of two quantities as percent composition (1:100)