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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.
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| Dataset URLs: | METADATA: HTML, Rich Text, XML(EML compliant) DATA: Comma Delimited, Excel file with Metadata and data | ||||||||
| Dataset ID: | 2012_GS_ITEX_ShrubCanopy_DailyLogger.03 | ||||||||
| Dataset Title: | Daily summaries of photosynthetically active radiation (PAR), relative humidity, and temperature data logged above, within, and below Betula nana and Salix pulchra shrub canopies during the summer of 2012 in vicinity of Toolik Lake, Alaska. | ||||||||
| Investigator 1: | |||||||||
| First Name: | Gaius | ||||||||
| Last Name: | Shaver | ||||||||
| Organization: | Ecosystems Center at the Marine Biological Laboratory | ||||||||
| Address line 2: | 7 MBL Street | ||||||||
| Address line 3: | |||||||||
| City: | Woods Hole | ||||||||
| State: | MA | ||||||||
| Zip Code: | 02543 | ||||||||
| Country: | United States | ||||||||
| Investigator 2: | |||||||||
| First Name: | Edward | ||||||||
| Last Name: | Rastetter | ||||||||
| Organization: | Ecosystems Center at the Marine Biological Laboratory | ||||||||
| Address line 2: | 7 MBL Street | ||||||||
| City: | Woods Hole | ||||||||
| State: | MA | ||||||||
| Zip Code: | 02543 | ||||||||
| Country: | United States | ||||||||
| Investigator 3: | |||||||||
| First Name: | Mathew | ||||||||
| Last Name: | Williams | ||||||||
| Organization: | University of Edinburgh | ||||||||
| Address line 2: | School of Geosciences | ||||||||
| City: | Edinburgh | ||||||||
| State: | |||||||||
| Zip Code: | EH9 EJU | ||||||||
| Country: | United Kingdom | ||||||||
| Investigator 4: | |||||||||
| First Name: | James | ||||||||
| Last Name: | Laundre | ||||||||
| Organization: | Ecosystems Center at the Marine Biological Laboratory | ||||||||
| Address line 2: | 7 MBL Street | ||||||||
| Address line 3: | |||||||||
| City: | Woods Hole | ||||||||
| Zip Code: | 02543 | ||||||||
| Country: | United States | ||||||||
| Investigator 5: | |||||||||
| First Name: | Laura | ||||||||
| Last Name: | van der Pol | ||||||||
| Organization: | Ecosystems Center at the Marine Biological Laboratory | ||||||||
| Address line 2: | 7 MBL Street | ||||||||
| City: | Woods Hole | ||||||||
| State: | MA | ||||||||
| Zip Code: | 02543 | ||||||||
| Country: | United States | ||||||||
| Associate Investigators: | |||||||||
| Keywords: | photosynthesis; shrub canopy, relative humidity; temperature; photosynthetica active radiation; PAR | ||||||||
| Abstract: | This file contains limited daily summaries of PAR, relative humidity, and temperature data monitored above, within, and below Betula nana and Salix pulchra shrub canopies at two locations near Toolik Lake, Alaska during the summer of 2012. The location of the PAR sensor and dataloggers were co-located with the LTER shrub plots (block 1 and 2), also used for the chamber flux and point frame measurements taken this same year. There were two logging sites (block 1 and 2), each of which had PAR five PAR sensors, two for each shrub canopy and one above, as well as three sensors to log relative humidity and temperature. This file contains maximum PAR, total daily PAR, and daily average temperature data, as well as intermittant maximum and minimum values for temperature and relative humidity. Data monitored every five minutes is available in the file "ShrubCanopy_InstantLogger". | ||||||||
| 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/ |
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| DATA FILE INFORMATION: | |||||||||
| Data File URL | http://metacat.lternet.edu/das/dataAccessServlet?docid=knb-lter-arc.10143&urlTail=terrest/tracegas/data/2012_GS_ITEX_ShrubCanopy_DailyLogger.csv | ||||||||
| Data File Name | 2012_GS_ITEX_ShrubCanopy_DailyLogger | ||||||||
| Beginning Date | 6/23/2012 | ||||||||
| End Date | 8/14/2012 | ||||||||
| Number of Data Records | 435 | ||||||||
| Other Files to Reference | 2012_GS_ITEX_BF3_DiffuseLightData; 012_GS_ITEX_CH_SoilData; 2012_GS_ITEX_CHFluxData; 2012_GS_ITEX_LC_ParameterSummary; 2012_GS_ITEX_MaxCanopyHeight; 2012_GS_ITEX_PercentCover; 2012_GS_ITEX_CHN_Data; 2012_GS_ITEX_PF_LAISummary; 2012_GS_ITEX_RawPinDrop_Data; 2012_GS_ITEX_ShootACiData; 2012_GS_ITEX_ShootHarvestData; 2012_GS_ITEX_ShrubCanopy_DailyLogger; 2012_GS_ITEX_InstantLogger; 2012_GS_ITEX_SunScan_LAI; 2012_GS_ITEX_SunScan_PAR; 2012_GS_PFandCH_GPS; 2012_GS_ITEX_PF_ShootLightCurve; 2003-2004gsfluxleafN; 2003-2009gscurveparameters; 2003-2009gsflux; 2003-2009gsGPSandveg; 2003-2009gsharvestLAI-N; 2003-2009gsspecieslist; 2004-2009gscoverft; 2004-2009gscoversp; | ||||||||
| Availability Status | 1 | ||||||||
| Quality Control Information | Temperature values >30deg C were changed to "NaN"; PAR values < 0 or > 2500 were changed to "NaN"; relative humidity values <0 or >100 were converted to "NaN". | ||||||||
| Maintenance Description | This was a season-long project, though it followed similar methods to ITEX projects performed starting in 2003 that are likely to be replicated in the future for reasearch at the Toolik Field Station, AK. | ||||||||
| Log of Changes: | Version 2: Updated units to current standards. Missing values changed to #N/A. CH 28Jan2013 | ||||||||
| Version 3: Updated metadata to newer form (with sites sheet). CH April 2013. | |||||||||
| Version 4 corrected eml exel file name JimL 16May13 | |||||||||
| RESEARCH LOCATION: | |||||||||
| Location Name | LTER Shrub Block 1 | LTER Shrub Block 2 | 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 | Upland site; co-located in Block 1 of the Shrub LTER sites; IVO 68° 38'18.8" N, 149° 34' 07.2" W +/- 50m. Plots are outside of the designated LTER treatments, though are exposed to the same environmental conditions. All plots were chosen by the dominant shrub canopy (either Salix pulchraor Betula nana) and preferentially selected to be 90cm+ in height. | Outlet site; co-located in Block 2 of the Shrub LTER sites; IVO 68° 38'008.1" N, 149° 35' 017.1" W +/- 50m. Plots are outside of the designated LTER treatments, though are exposed to the same environmental conditions. All plots were chosen by the dominant shrub canopy (either Salix pulchraor Betula nana) and preferentially selected to be 90cm+ in height. | 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 | 68.6385555555555 | 68.6355833333333 | In Decimal Degrees | In Decimal Degrees | In Decimal Degrees | In Decimal Degrees | In Decimal Degrees | In Decimal Degrees | |
| Longitude | -149.568666666666 | -149.588083333333 | In Decimal Degrees | In Decimal Degrees | In Decimal Degrees | In Decimal Degrees | In Decimal Degrees | In Decimal Degrees | |
| Elevation | 747 m | 730 m | In Meters | In Meters | In Meters | In Meters | In Meters | In Meters | |
| Link to Google Map | View on Google Map | View on Google Map | |||||||
| TAXONOMIC COVERAGE: | |
| Organisms studied | Betula nana; Salix pulchra |
| Methods: | Automated Data Logging In order to monitor canopy conditions of the shrub species of interest--Betula nana and Salix pulchra--two CR1000 dataloggers (Campbell Scientific, 815 W. 1800, North Logan, UT, USA) were installed at the sites used for the ITEX shrub canopy studies at Toolik Field Station in Alaska the summer of 2012. The sites (see "Group" category) are labeled as "Upland" and "Outlet"--descriptions of the sample site in relation to Toolik Lake. The Upland site is colocated with Block 1 of the LTER shrub vegetation plots; the Outlet site is colocated with Block 2. The dataloggers were adjacent to, rather than within, LTER plots. Both the Upland and Outlet datalogger had the following sensors which logged every five minutes: (5) Photosynthetically active radiation (PAR) sensors: LI-190SB Quantum Sensor (Li-Cor Biosciences, 4647 Superior St, Lincoln, NE, USA) * Sensors were placed as follows: (1) Above all vegetation at a height of 2.2 meters (1) Mid-way within the B. nana canopies (approximately 40 cm above the soil) (1) Mid-way within the S. pulchra canopies (approximately 40 cm above the soil) (1) Below the B. nana canopies (approximately 10 cm above the soil) (1) Below the S. pulchra canopies (approximately 10 cm above the soil) (3) Relative humidity (RH) and temperature sensors: HMP50/HMP60 Probe (Campbell Scientific, North Logan, UT, USA) * Sensors each had either a 6- or 10-plate radiation shield (Campbell Scientific model 41303-5A or 41003-5) * Sensors were placed as follows: (1) Above all vegetation at a height of 2 meters (1) Below the B. nana canopies (approximately 10 cm above the soil) (1) Below the S. pulchra canopies (approximately 10 cm above the soil) These instantaneous data are available in the file "Instant_Logger". The extreme values that sensors encountered were also recorded; these are included in this file. The temperature monitoring performed by the datalogger itself (maximum and average daily temperatures) do not represent direct air temperatures as the datalogger was housed in a sealed, white, hard-plastic box mounted approximately 1.5 meters above the ground. SunScan LAI and PAR Measurements: As with other measurments collected the summer 2012 for the ITEX project at Toolik Field Station, a Delta-T SunScan wand (Delta-T Devices Ltd, Burwell Cambridge, UK) was use to characterize the shrub canopies with the dataloggers. These data are included in the datasets: "SunScan_LAI_Data" and "SunScan_PAR_Data". The methods used for each are described below. The methods used to collect PAR at many heights within each canopy were the same used to collect LAI, with the difference being the setting on the SunScan wand. The measurements were taken near the end of the growing season when leaves were already beginning to senesce. Additionally, while these measurements are traditionally made in conjunction with a Beam Fraction sensor (BF3), this sensor was malfunctioning when the datalogger sites were sampled , and thus it was not used. Instead of the BF3 sensor, wand measurements above the canopy were made immediately prior to each data measurement to record the ambiant total irradiance levels. Readings were taken by inserting the SunScan wand near to the ground as possible--typically starting at 5 centimeters from the ground (the wand rested atop the moss layer)--and then repeated every 15 cm with the last measurement being above the canopy. Measurements were taken with the field technician opposite the direction of the sun at five locations within the canopy at each height. Five replicates were taken at each height in the canopy immediately surrounding the datalogger sensors; this differs from the ITEX samples which had three replicate scans at each height. The weather conditions during these measurements were almost uniform cloud cover; thus nearly all of the measurements were taken under "diffuse" light conditions (diffuse light fraction greater than 0.7). The measurements taken with "direct" light conditions were taken on partly cloudy days. The SunScan wand measures PAR along 64 points along a 1-m horizontal profile. When sampling PAR within the shrub canopy, the data are from the raw output from each PAR sensor. When sampling LAI, there is an internal calculation performed though the Delta-T software that compares the reading above the canopy to the reading within the canopy, and takes into account the percent of absorbed PAR (assumed to be 0.85), and the ellipsoidal leaf angle distribution parameter (ELADP*) (assumed to be 1.0). In addition to the LAI values, the Delta-T SunScan instrument gives an output of other variables including: transmitted light, spread among sensors, beam fraction, and zenith angle. These values are further described here: Transmitted Light: the fraction of incident light that passes through a given canopy. It can refer to Direct, Diffuse, or Total incident light. Spread: the standard deviation of the 64-PAR sensors on the SunScan wand. Beam Fraction: the fraction of the Total incident PAR in the Direct beam. Zenith Angle: the angle between the centre of the sun and the point directly overhead. Zenith angles are calculated from latitude, longitude, and local time using standard astronomical equations as given in Practical Astronomy. The location used to determine the local zenith angle was: 68° 37' 39" N, Longitude 149° 35' 51" W. *"ELADP is a way of characterizing the horizontal or vertical tendency of leaves in a canopy." p 37 of SS1 User Manual v2.0 (SunScan Canopy Analysis System, type SS1. Delta-T Devices Ltd. May 19, 2008) |
| Variable Name | Variable Description | Data Type | Units | DateTime Format | Code Information | Missing Value Code |
| YEAR | year of measurement | datetime | YYYY | #N/A=Missing or Not Measured | ||
| DATE | Date of measurement | datetime | DD-MMM-YY | #N/A=Missing or Not Measured | ||
| SITE | Toolik | text | #N/A=Missing or Not Measured | |||
| GROUP | Measurement location in relation to Toolik Lake LTER Shrub plots; In vicinity of Block1 = Upland, IVO Block 2 = Outlet | text | #N/A=Missing or Not Measured | |||
| CANOPY | Canopy sensors monitored; sensors above the canopies monitored ambient conditions for both BET and SALP vegetation | text | #N/A=Missing or Not Measured | |||
| SENSOR POSN | Sensor relative height | text | #N/A=Missing or Not Measured | |||
| BattV_Min | Minimum battery voltage during the day of measurement (battery is 12v) | number | volt | #N/A=Missing or Not Measured | ||
| PTemp_C_Max | Maximum temperature (deg Celsius) measured by datalogger | number | celsius | #N/A=Missing or Not Measured | ||
| PTemp_C_TMx | 24-hour time that the maximum datalogger temperature was recorded | datetime | HH24:Mi | #N/A=Missing or Not Measured | ||
| PTemp_C_Avg | Daily average temperature encountered by datalogger | number | celsius | #N/A=Missing or Not Measured | ||
| MAX TEMP | Maximum temperature (deg Celsius) measured by relative humidity sensor for given canopy / position | number | celsius | #N/A=Missing or Not Measured | ||
| TIME OF MAX TEMP | 24-hour time that maximum temperature was encountered | datetime | HH24:Mi | #N/A=Missing or Not Measured | ||
| MIN TEMP | Minimum temperature (deg Celsius) measured by relative humidity sensor for given canopy / position | number | celsius | #N/A=Missing or Not Measured | ||
| TIME OF MIN TEMP | 24-hour time that minimum temperature was encountered | datetime | HH24:Mi | #N/A=Missing or Not Measured | ||
| MAX RH | Maximum recorded relative humidity encountered by given sensor | number | percent | #N/A=Missing or Not Measured | ||
| TIME OF MAX RH | 24-hour time that maximum relative humidity was encountered | datetime | HH24:Mi | #N/A=Missing or Not Measured | ||
| MAX PAR | Maximum recorded photosynthetic active radiation (PAR) for given sensor (umol PAR per square m per sec) | number | micromolePerMeterSquaredPerSecond | #N/A=Missing or Not Measured | ||
| TIME OF MAX PAR | 24-hour time that maximum PAR was encountered by sensor | datetime | HH24:Mi | #N/A=Missing or Not Measured | ||
| DAILY TOTAL PAR | Sum of PAR encountered by given sensor during the day (umol PAR per square m per day) | number | micromolePerMeterSquaredPerDay | #N/A=Missing or Not Measured |