uid=ARC,o=lter,dc=ecoinformatics,dc=org all public read ArcticLTER_Lakes_Toolik_JulyEpiCond.03 Arctic LTER Program Anne Giblin

Marine Biological Laboratory Ecosystems Center 7 MBL Street Woods Hole MA 02543 United States of America

Arctic LTER Program Christopher Luecke

Utah State University Department of Watershed Science Logan UT 84322-5210 United States of America

Arctic LTER Program 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/ Dan White

Marine Biological Laboratory Ecosystems Center 7 MBL Street Woods Hole MA 02543 United States of America

Associated Researcher 2010 Average conductivity of the epilimnion (0-3m of water depth) found in Toolik Lake during the month of July. chemistry hydrolab conductivity aquatic aquatic ecosystems arctic freshwater lakes limnology physical specific conductivity epilimnion summer 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=./lakes/physchem/xlsfiles/ArcticLTER_Lakes_Toolik_JulyEpiCond.html Toolik Lake, Main Station -149.60407 -149.60407 68.63293 68.63293 1992-07-01 2009-07-01 added data from 1992-2000 For version .02 data back to 1977 was added, added in conductivity data at depth and daily average, added depth and temperature data, "Sheet 1" was left attached as a yearly summary Version 3: Updated metadata to newer form (with sites sheet). CH April 2013. 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/ For Data from 2007 thru 2009 measurements were taken with a DS5 Hydrolab Datasonde. Depth reading on sonde was calibrated in the field so that a depth of 0m was the water surface. For profiles, measurements were taken at surface (~0m) then at 1m intervals until bottom. Measurements were recorded on a Surveyor 4 Datalogger. For Data from 2001 thru 2006 measurements were taken with a DS4a Hydrolab Datasonde. Depth reading on sonde was calibrated in the field so that a depth of 0m was the water surface. For profiles, measurements were taken at surface (~0m) then at 1m intervals until bottom. Measurements were recorded on a Surveyor 4 Datalogger. For Data from 1993 thru 2000 measurements were taken with a Hydrolab H20-BT STd multiprobe. For profiles, measurements were taken at surface (~0m) then at 1m intervals until bottom. Measurements were recorded on a Surveyor 3 Datalogger. For Data from 1977 thru 1992 measurements were taken with a YSI model 33 conductivity meter. For profiles, measurements were taken at surface (~0m) then at 1m intervals until bottom. Daily average specific conductance of the epilimnion was calculated as the mean of all conductivity measurements from the water's surface to three meters of depth on a particular day. Yearly average specific conductance of the epilimnion was calculated as the mean of all daily average specific conductance of the epilmnion values. The "Sheet 1" worksheet contains a summary of yearly average specific conductance of the epilimnion values from the "Julyepi" worksheet. pers-1 http://ecosystems.mbl.edu/ARC/lakes/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 ArcticLTER_Lakes_Toolik_JulyEpiCond.csv Average Epilimnetic Conductivity from 1992 to present in Tooli Lake, Arctic LTER, Alaska. ArcticLTER_Lakes_Toolik_JulyEpiCond.csv 1 \r\n column , " http://metacat.lternet.edu/das/dataAccessServlet?docid=knb-lter-arc.10093&urlTail=lakes/physchem/data/ArcticLTER_Lakes_Toolik_JulyEpiCond.csv Site Site Site Name: Name of the lake where measurements were taken. There are discrete sampling sites defined by water depth, generally they are at the point of maximum depth. Toolik Main the main sampling station on Toolik Lake's largest basin Date Date Date readings were taken on. dd-mon-yyyy Dep_m Dep_m Depth of water measurement taken at starting from the surface as 0. meter real .=Missing or Not Measured code for missing values Temp_C Temp_C Water temperature at depth. celsius real .=Missing or Not Measured code for missing values Cond_uS Cond_uS Specific conductivity of the water at depth corrected to 25C. microsiemenPerCentimeter real .=Missing or Not Measured code for missing values Daily_Avg_Cond_uS Daily_Avg_Cond_uS Daily average specific conductivity of the epilimnion (0-3m of depth) corrected to 25C. microsiemenPerCentimeter real .=Missing or Not Measured code for missing values Yearly_Avg_Cond_uS Yearly_Avg_Cond_uS Yearly average specific conductivity of the epilimnion (0-3m of depth) corrected to 25C. microsiemenPerCentimeter real .=Missing or Not Measured code for missing values 534 ArcticLTER_Lakes_Toolik_JulyEpiCond.xls An excel file that has worksheets with the metadata and data. ArcticLTER_Lakes_Toolik_JulyEpiCond.xls Microsoft Excel http://metacat.lternet.edu/das/dataAccessServlet?docid=knb-lter-arc.10093&urlTail=lakes/physchem/xlsfiles/ArcticLTER_Lakes_Toolik_JulyEpiCond.xls Microsoft Excel file conductivity unit