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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.
6 ) Collaboration. The Data Set has been released in the spirit of open scientific collaboration. Data Users are thus strongly encouraged to consider consultation, collaboration and/or co-authorship with the Data Set Creator.
By accepting this Data Set, the Data User agrees to abide by the terms of this agreement. The Data Owner shall have the right to terminate this agreement immediately by written notice upon the Data User's breach of, or non-compliance with, any of its terms. The Data User may be held responsible for any misuse that is caused or encouraged by the Data User's failure to abide by the terms of this agreement.
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|Dataset URLs:||METADATA: HTML, Rich Text, XML(EML compliant) |
DATA: Comma Delimited, Excel file with Metadata and data
|Dataset Title:||Daily weather and soil temperature data from the Arctic LTER Moist Acidic Tussock Experimental plots for 2003, Toolik Filed Station, North Slope, Alaska.|
|Investigator 1:|| |
|Organization:||Marine Biological Laboratory|
|Address line 2:||The Ecosystems Center|
|Address line 3:||7 MBL Street|
|Investigator 2:|| |
|Organization:||Marine Biological Laboratory|
|Address line 2:||The Ecosystems Center|
|Address line 3:||7 MBL Street|
|Keywords:||weather, air temperature, relative humidity, soil temperature, radiation, wind|
|Abstract:||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.|
|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
Online URL: http://ecosystems.mbl.edu/ARC/
|DATA FILE INFORMATION:|
|Data File URL||http://metacat.lternet.edu/das/dataAccessServlet?docid=knb-lter-arc.1547&urlTail=weather/tu/data/2003dltud.csv|
|Data File Name||2003dltud.dat|
|Number of Data Records||72|
|Other Files to Reference|
|Quality Control Information|
|Log of Changes:||Log of changes: For Archival Use: DATE RECEIVED: Jun2003, Aud2003 DATA FILE ENTERED BY: J.Laundre DATA FILE VALIDATION: 2Dec2003 NAME:JL DATE:|
|Version 3: Metadata updated to newer form (with sites sheet). Units updated to current standards. Discrepancy with variable names fixed. CH April 2013.|
|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 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|
A Campbell CR21x data logger, in the LTER acidic experimental plots (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 yDLTUD.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.
Note: The covers on greenhouses and shade houses are removed every fall and reinstalled every spring.
Notes: Only unfrozen precipitation is reported.
Data was lost during the winter. The cause is unknown. The logger was reading the sensors but not storing to final storage. A bad temperature/RH probe could have caused it. The Campbell CS500 temperature/RH sensors were problematic. The splice in the lead let moisture infiltrated the lead wire splice joint and resulting in a short that caused bad readings and in the worst case it affected other sensors on the data logger.
Soil temperatures are problematic since frost heaving of the probes caused depth of measurements to change. Depth changes and whether the TCs are reset are noted in the Comment variable. Most frost heaving may occur it spring. In August 1998 all profiles were reset using a white fiberglass pole anchored approximately 75 cm in to the permafrost. Replicates were installed in average non-tussock microsites. In January, February and December there are some erratic soil temperatures that are unexplained.
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.
Missing values are indicated by #N/A
Reference Citations: Buck, A.L. 1981 New equations for computing vapor pressure and enhancement factor. Journal of Applied Meteorology 20:1527-1532.
VAPOR PRESS : If Air Temp > 0 then (RH 5M/100) * 6.1121 * exp(17.368 * AIR TEMP 5M/(238.88 + AIR TEMP 5M)) If Air Temp < 0 then (RH 5M/100) * 6.1121 * exp(17.966 * AIR TEMP 5M/(238.88 + AIR TEMP 5M)) PYR TOTAL CM2 HOUR: PYRANOMETER * 0.3600 jcm2 * 1000 Watt/Kwatt
|Variable Name||Variable Description||Data Type||Units||DateTime Format||Code Information||Missing Value Code|
|ID||Program step that output the data||text|
|Rain mm||Total daily unfrozen rain||number||millimeter||#N/A=Missing or Not Measured|
|CT TEMP 3M||Daily average air temperature at 3meter||number||celsius||#N/A=Missing or Not Measured|
|MAX CT TEMP 3M||Maximum temperature at 3 meter||number||celsius||#N/A=Missing or Not Measured|
|MAX HOUR CT TEMP 3M||Time of air temperature max at 3 meters||datetime||HHMM|
|MAX WIND SPEED 3M||Wind Speed Maximum at 3 meter||number||meterPerSecond||#N/A=Missing or Not Measured|
|MAX HOUR WIND SP||Time of wind speed Max at 3M||datetime||HHMM|
|MIN CT TEMP 3M||Minimum air temperature at 3 meter||number||celsius||#N/A=Missing or Not Measured|
|MIN HOUR CT TEMP 3M||Time of air temperature min at 3 meter||datetime||HHMM|
|WIND SPEED 3M m/s||Daily average wind speed at 3-meter||number||meterPerSecond||#N/A=Missing or Not Measured|
|GH TEMP||Daily greenhouse air temperature||number||celsius||#N/A=Missing or Not Measured|
|SH TEMP||Daily shade house air temperature||number||celsius||#N/A=Missing or Not Measured|
|CT Quantum mol/m2/day||Control Photosynthetic Active Radiation sensor in||number||molePerMeterSquaredPerDay||#N/A=Missing or Not Measured|
|GH Quantum mol/m2/day||Greenhouse Photosynthetic Active Radiation sensor||number||molePerMeterSquaredPerDay||#N/A=Missing or Not Measured|
|SH Quantum mol/m2/day||Shade house Photosynthetic Active Radiation sensor in||number||molePerMeterSquaredPerDay||#N/A=Missing or Not Measured|
|VAPOR PRES||Avg. Vapor Pressure at 3 meters||number||millibar||#N/A=Missing or Not Measured|
|PYR J CM2 DAY||Total joules per sq cm per day||number||joulePerCentimeterSquaredPerDay||#N/A=Missing or Not Measured|
|CT1 10cm||Set 1 daily average soil temperature at 10cm||number||celsius||#N/A=Missing or Not Measured|
|CT1 20cm||Set 1 daily average soil temperature at 20cm||number||celsius||#N/A=Missing or Not Measured|
|CT1 40cm||Set 1 daily average soil temperature at 39cm||number||celsius||#N/A=Missing or Not Measured|
|CT2 10cm||Set 2 daily average soil temperature at 10cm||number||celsius||#N/A=Missing or Not Measured|
|CT2 20cm||Set 2 daily average soil temperature at 20cm||number||celsius||#N/A=Missing or Not Measured|
|CT2 40cm||Set 2 daily average soil temperature at 40cm||number||celsius||#N/A=Missing or Not Measured|
|COMMENTS||Comments about individual datum points.||text|