uid=ARC,o=lter,dc=ecoinformatics,dc=org all public read 2007dlMATd.03 Arctic LTER Program Gus Shaver

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

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/ Jim Laundre

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

Associated Researcher 2009 Daily weather and soil temperature data from the Toolik Tussock Experimental plots. In 1990 a Campbell CR21X data logger 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. weather air temperature relative humidity soil temperature radiation wind 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=./weather/tu/xlsfiles/2007dlMATd.html Toolik Lake Field Station (68 38' N, 149 36'W), LTER moist acidic tussock site on hill south of Toolik Lake, North Slope of Alaska. -149.607 -149.607 68.624 68.624 2007-01-01 2007-12-31 Version 1: DATA FILE ENTERED BY: J.Laundre 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). Units updated to current standards. 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/ A data logger, in the LTER acidic experimental plots (moist acidic tundra site - MAT) (block 2), is used to monitor weather and soil temperatures. Sensors in the control plot include: global solar radiation, photosynthetic 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 photosynthetic 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 yDLMATD.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. NOTES: The covers on greenhouses and shade houses are removed every fall and reinstalled every spring. Only unfrozen precipitation is reported. Soil temperatures are problematic since frost heaving of the probes caused depth of measurements to change. In January, February and December When the air temperature is < -30 degrees the soil temperatures will show a slight rise due to increased error of the reference temperature used for the theromcouples. For the global solar radiation and photosynthetic 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. The CS500 Temperture/RH sensor does not read below -40 C. All temperture values below -38.5 were deleted. The Greenhouse and Sahde house PAR sensors were not functioning summer 2007. Missing values are indicated by #N/A ----------------------------------------------------------------------------------------------------------------------------------------------- Sensor Description Following are brief descriptions of the sensors used at the weather monitoring station. Included with each description is a list of stations using the sensor and the number of sensors at that site. Company addresses follow the list. --------------------------------------------------------------------------------------------------------------------------------------------- PYRANOMETER: Li-Cor, Pyranometer: Model LI-200SA- Sensor measures global solar radiation (sun plus sky). Specs: Sensitivity - 80mA per 1000 Watts m-2. Absolute error max ±5% but typically ±3 QUANTUM: Li-Cor, Quantum. Model LI-190SB. Quantum measure photosynthetically active radiation (PAR) in ?mol s-1 m-2. Specs: range 400-700nm wavelength. Sensitivity 8mA/1000 ?mol s-1 m-2. Relative error less then ±10% for plant canopies or less then ±5% for growth chambers. Toolik. RELATIVE HUMIDITY/TEMPERATURE: Campbell Scientific, CS500 Temperature and Relative Humidity Probe. Uses PRT for temperature measurement; capacitive RH chip for RH. Accuracy is ±3% over 10-90% RH; ±6% over 90-100% RH. Manufactured by Vaisala, Inc. WIND DIRECTION: MET-ONE, (supplied by Campbell Scientific) Wind direction use a light weight, air foil vane and a potentiometer to produce an output that varies proportional with wind direction. Specs: Minimum Wind speed to get accurate reading = 1.0 mph. Accuracy ±5° Temperature range -50 to 70°C. WIND SPEED: MET-ONE, (supplied by Campbell Scientific) Wind speed sensor Model 014A. Sensor uses a 3-cup anemometer assembly and simple magnet-read switch assembly to produce a series of contact closures whose frequency is proportional to wind speed. Specs: Operating Range - 0 to 125 mph or 0-60 m/s. Accuracy ±1.5% or 0.25 mph. Working temperature range - -50 to 85°C RAIN GAUGE: Texas Electronics, Inc. (supplied by Campbell Scientific) Tipping Bucket Electric Rain Gauge. A complex spun collector funnel with a knife edge that diverts the water to a tipping bucket mechanism. For each tip a magnet causes an electronic pulse that is recorded. Each alternate tip occurs for each 0.01 inch of rainfall. Specs: Accuracy 1% at 2 inches/hr or less. Accurate Temperature Range: 0 - 37°C. Alter wind shield installed around gauge. THERMOCOUPLES: Omega Engineering, Copper-Constantan wire. Range -200 to 350 °C. Limits of error: Standard wire 1.0°C or 0.75% above 0°C and 1.0°C or 1.5% below 0°C. Special wire 0.5°C or 0.4%. List of manufactories and suppliers. Campbell Scientific, Inc. 81 W. 1800 N. Logan, Utah 84321-1784 (435)750-1739 Druck Inc. 4 Dunham Drive New Fairfield, CT 06812 (203)746-0400 Li-Cor 4421 Superior St P.O. Box 4425 Lincoln, Nebraska 68504 (800)447-3576 Omega Engineering, Inc. P.O. Box 4047 Stamford, CT 06907-0047 (800)826-6342 Reference Citations: Buck, A.L. 1981 New equations for computing vapor pressure and enhancement factor. Journal of Applied Meteorology 20:1527-1532. Vapor Press Formula: If Air Temp > 0 then (CRH 3M/100) * 6.1121 * exp(17.368 * CTEMP 3M/(238.88 + CTEMP 3M)) If Air Temp < 0 then (CRH 3M/100) * 6.1121 * exp(17.966 * CTEMP 3M/(238.88 + CTEMP 3M)) (Buck 1981). pers-1 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 2007dlMATd.csv Daily weather and soil temperature data from the Arctic LTER Moist Acidic Tussock Experimental plots for 2007, Toolik Filed Station, North Slope, Alaska. 2007dlMATd.csv 1 \r\n column , " http://metacat.lternet.edu/das/dataAccessServlet?docid=knb-lter-arc.10028&urlTail=weather/tu/data/2007dlMATd.csv Date Date Date dd-mon-yyyy Month Month Month mm ID ID Program step that output the data number real #N/A=Missing or Not Measured code for missing values Year Year Year yyyy Julian Julian Julian Date number real RAIN mm RAIN mm Total daily unfrozen rain millimeter real #N/A=Missing or Not Measured code for missing values CT TEMP 3M CT TEMP 3M Daily average air temperature at 3meter celsius real #N/A=Missing or Not Measured code for missing values CT TEMP MAX 3M CT TEMP MAX 3M Maximum temperature at 3 meter celsius real #N/A=Missing or Not Measured code for missing values MAX HOUR CT TEMP 3M MAX HOUR CT TEMP 3M Time of air temperature max at 3 meters hhmm #N/A=Missing or Not Measured code for missing values WS MAX 3M WS MAX 3M Wind Speed Maximum at 3 meter meterPerSecond real #N/A=Missing or Not Measured code for missing values MAX HOUR WIND SP MAX HOUR WIND SP Time of wind speed Max at 3M hhmm #N/A=Missing or Not Measured code for missing values CT TEMP MIN 3M CT TEMP MIN 3M Minimum air temperature at 3 meter celsius real #N/A=Missing or Not Measured code for missing values MIN HOUR CT TEMP 3M MIN HOUR CT TEMP 3M Time of air temperature min at 3 meter hhmm #N/A=Missing or Not Measured code for missing values WIND SP 3M WIND SP 3M Daily average wind speed at 3-meter meterPerSecond real #N/A=Missing or Not Measured code for missing values GH TEMP GH TEMP Daily greenhouse air temperature celsius real #N/A=Missing or Not Measured code for missing values SH TEMP SH TEMP Daily shade house air temperature celsius real #N/A=Missing or Not Measured code for missing values CT Quantum mol/m2/day CT Quantum mol/m2/day Control Photosynthetic Active Radiation sensor in molePerMeterSquaredPerDay real #N/A=Missing or Not Measured code for missing values GH Quantum mol/m2/day GH Quantum mol/m2/day Greenhouse Photosynthetic Active Radiation sensor molePerMeterSquaredPerDay real #N/A=Missing or Not Measured code for missing values SH Quantum mol/m2/day SH Quantum mol/m2/day Shade house Photosynthetic Active Radiation sensor in molePerMeterSquaredPerDay real #N/A=Missing or Not Measured code for missing values Vapor Press Vapor Press Daily average vapor pressure for Control temperature/relative humidity at 3 meters. millibar real #N/A=Missing or Not Measured code for missing values PYR TOTAL J CM2 DAY PYR TOTAL J CM2 DAY Daily total joules/cm2 (sum of hourly average PYRANOMETERreadings * .3600 jcm2 * 1000 watt/Kwatt) onlyf from May through September. joulePerCentimeterSquaredPerDay real #N/A=Missing or Not Measured code for missing values Comments Comments Comments about individual datum points. Comments about individual datum points. 365 2007dlMATd.xls An excel file that has worksheets with the metadata and data. 2007dlMATd.xls Microsoft Excel http://metacat.lternet.edu/das/dataAccessServlet?docid=knb-lter-arc.10028&urlTail=weather/tu/xlsfiles/2007dlMATd.xls Microsoft Excel file meters per second Moles of substance per square meter per day Amount of energy per square centimeter surface per day