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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:

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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.

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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_BF3_DiffuseLightData.02
Dataset Title:Total and diffuse photosynthetically active radiation (PAR) recorded by a beam fraction (BF3) sensor 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, diffuse light fraction; total irradiance; chamber flux; point frame; datalogger; photosynthetica active radiation; PAR
Abstract:This file contains irradiance (PAR) and diffuse light data logged from a beam fraction (BF3) sensor near Toolik Lake, Alaska during the summer of 2012. The data comes from a compilation of automated datalogger readings as well as measurements taken during the field season in conjunction with the Delta-T SunScan wand to measure PAR in tall shrub canopies dominated by Betula nana or Salix pulchra species. The sensor was leveled and mounted to a 2m tripod in each location, and programmed to record instantaneous readings in 30 second to 5 minute intervals.
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/
DATA FILE INFORMATION:
Data File URL http://metacat.lternet.edu/das/dataAccessServlet?docid=knb-lter-arc.10133&urlTail=terrest/tracegas/data/2012_GS_ITEX_BF3_DiffuseLightData.csv
Data File Name 2012_GS_ITEX_BF3_DiffuseLightData
Beginning Date 6/23/2012
End Date 8/8/2012
Number of Data Records 9332
Other Files to Reference MANY OTHERS
Availability Status 1
Quality Control Information Diffuse fraction values >1 were changed to "NaN"; PAR values < 0 or > 2500 were changed 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: Updated Metadata sheet
Version 2: Updated metadata to newer form (with sites sheet). CH April 2013.
 
RESEARCH LOCATION:                  
Location Name LTER Shrub Block 1 LTER Shrub Block 2 Toolik Field Station Lab 2 Toolik Field Station Gate 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. Lab2; used briefly as a location for the beam fraction sensor (BF3) to autolog. This site is located on the shore of Toolik Lake behind the Lab 2 building. It was chosen for convenient access, though ultimately was changed because of the prevalence of nearby structures. Toolik Gate; this was the preferred logging location for the beam fraction sensor (BF3). This site was located just up the road from the entrance to the field station. It was chosen for the complete absence of nearby structures and the ease of access. 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 68.6271861111111 68.6272416666666 In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees  
Longitude -149.568666666666 -149.588083333333 -149.598469444444 -149.585425 In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees  
Elevation 747 m 730 m 720 m 743 m In Meters In Meters In Meters In Meters  
Link to Google Map View on Google Map View on Google Map View on Google Map View on Google Map          
                   
 
TAXONOMIC COVERAGE:
Organisms studied Betula nana; Salix pulchra
 
Methods:This dataset is a compilation of data taken with the beam fraction sensor (called the BF3 sensor, manufactured by Delta-T Devices Ltd, Burwell Cambridge, UK) during the summer of 2012 at the Toolik Field Station in Alaska. While the goal was for the BF3 sensor to monitor conditions continuously throughout the growing season, the sensor experienced frequent malfunctions, causing there to be significant gaps in the data record.

As this is a compilation of time when the BF3 sensor was logging, the interval between measurements and the device regulating the data collection vary. Before describing the methods used in each kind of collection, it is useful to describe the BF3 set-up that was common to all collection times:

* The BF3 sensor was mounted and leveled on the tripod sent with the instrument from the manufacturer (at height approximately 2 m) every time it was used. Care was taken to ensure that the BF3 was not near any structures that might influence the PAR readings, and that it would not be located in a highly trafficked area.

* The BF3 sensor consists of seven PAR sensors arranged in a mathematically formulated way and shaded with a uniquely shaped "shield" that enables the device to calculate the fraction of diffuse light regardless of the sun angle or time of day. This "shield" has a strip through the center that is open through the diameter of the hemisphere where the PAR sensors are located. As recommended by the manufacturer, this open strip was always arranged such that it was oriented in an East - West direction. [This supposedly ensures one PAR sensor will always be shaded; an important component to the BF3 calculations. See the BF3 Instruction manual for further details.]

BF3 Data Logging with a CR800
Whenever possible, the beam fraction sensor was programmed to log total and diffuse irradiance every five minutes on a CR800 datalogger (Campbell Scientific, 815 W. 1800, North Logan, UT, USA).

The site initially chosen for this automated logging was behind a laboratory near Toolik Lake; this site was called "Lab2". While at least 10 meters from the nearest structure, it was thought that the proximity of the lab buildings might influence or even shade the BF3 sensor at low sun angles. Thus a second site was chosen--"Toolik Gate". This site is located at the entrance to the gravel pad of Toolik Field Station and had no nearby structures that could interfere with the BF3 readings.

The positions and elevations of these sites were estimated from GoogleEarth maps.

Autologging during Chamber Flux or Point Frame Measurements
For the duration of fielld days when chamber flux (CH) or point frame (PF) measurements were being made, the BF3 sensor was set to autolog with the Trimble PDA and SunScan wand (also Delta-T) designed for use with the BF3 sensor. The log interval was set to take an instantaneous reading either every sixty or thirty seconds. The location of the sensor was within five meters of the latitude and longitude associated with the "Plot" listed on the data page, though the exact position of the BF3 sensor was not recorded. The point frame (PF) and chamber flux (CH) measurements GPS coordinates were measured with a handheld Garmin Etrex GPS unit while tracking at least five satellites; elevation for all sites was estimated from GoogleEarth.

In some cases, the SunScan wand (which logs 64-PAR readings along the 1-m wand in synch with the BF3 sensor) was placed beneath a plot previously sampled. In these intances, the Plot ID of the canopy associated with the SunScan wand is listed in the "Notes" section. The raw output of these PAR readings are listed in PAR 1... PAR 64(tip).

SunScan PAR Measurements:
The SunScan wand was used to characterize PAR at many heights within each canopy; as the BF3 sensor was also used for these measurements, those data have been included here as ambient BF3 and total irradiance data. The PAR data for all plots are summarized in the file, "SunScan_PAR" , and the collection methods are summarized here:

The methods used to collect PAR at many heights within each canopy were the same used to collect LAI (see "SunScan_LAI_Data"), the primary difference being the settings in the Delta-T software. We measured PAR at 64 points within a 1-m horizontal profile using a DeltaT SunScan wand in conjuction with the BF3 sensor . The BF3 sensor recorded total irradiance and incident diffuse light simultaneously with the SunScan wand's 64-PAR readings evenly spaced along the 1m long wand.

Readings were taken by inserting the SunScan wand as near to the ground as possible--typically ~5cm from the ground as the wand rested on top of moss--and then measured vertically every 15 cm with the last measurement being above the canopy. Measurements were taken from the side of the chamber or point frame opposite the sun at three locations for each height under both direct (ambient) and diffuse light conditions. In many cases the replicates at each height were differentiated by row (1-3, or occasionaly 3-8 which correspond to the point frame pins). Typically diffuse light conditions were achieved by shading only the shrub canopy with photographic diffuser panels (the BF3 sensor was not shaded). On occasion, measurements were taken during cloudy light conditions where the diffuse light fraction was greater than 0.7 and no diffuser panel was needed; on these occasions the direct and diffuse light estimates may have been taken in slightly different locations as they were taken at different times and the precise position of the SunScan wand could not be replicated exactly.

Data Table

Variable Name Variable Description Data Type Units DateTime Format Code Information Missing Value Code
YEAR year of measurement datetime   YYYY    
DATE Date of measurement datetime   DD-MMM-YY    
TIMESTAMP Date and 24-hour time of measurement datetime   M/DD/YYYY HH24:Mi    
SITE Toolik (e.g. Toolik Field Station or TFS) text        
GROUP Upland and Outlet sites are descriptions in relation to Toolik Lake LTER Shrub plots; In vicinity of Block1 = Upland, IVO Block 2 = Outlet; measurements were occasionally logged behind Lab 2 at Toolik Field Station (TFS); they were also logged near the entrance gate to TFS (Toolik gate) due to the absence of obstructions. text        
DOM VEG Where applicable, this vegetation refers to the dominant shrub canopy species associated with the specific "Plot"; the BF3 was alwayss kept above all vegetation when logging. text        
TREATMENT Where applicable, the treatment associated with the specific "Plot". text        
MEASUREMENT Type of measurement this data was recorded for (e.g. chamber flux, point frame, or recorded by a datalogger) text        
PLOT Where applicable, refers to Individual plot identifier text        
N LAT Latitude IVO where BF3 was logging (+/- 5m) decimal degrees N number degree     NaN=Missing or Not Measured
W LONG Longitude IVO where BF3 was logging (+/- 5 m) decimal degress W number degree     NaN=Missing or Not Measured
ELEVATION GoogleEarth elevation estimate (m above sea level) number meter     NaN=Missing or Not Measured
TIME 24-hour time of measurement datetime   HH24:Mi:SS   NaN=Missing or Not Measured
ID_1 SunScan file record number 1 associated with measurement text        
ID_2 SunScan file record number 2 or datalogger record nuimber associated with measurement text        
SunScan WAND AVG Where applicable, average of 64-PAR sensors on the SunScan wand number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
WAND SPREAD Where applicable, standard deviation of the 64-PAR sensors on the SunScan wand (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
BF3 TOT IRRAD Total irradiance (direct and diffuse) measured by the BF3 sensor (umol total PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
BF3 DIFFUSE Total diffuse light measured by the BF3 sensor (umol diffuse PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
DIFFUSE LIGHT FRACTION Fraction (%) of diffuse light = (Diffuse Light) / (Total Irradiance); measured by BF3 sensor number micromolePerMicromole     NaN=Missing or Not Measured
PAR 1 Individual PAR reading for each PAR sensor 1; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 2 Individual PAR reading for each PAR sensor 2; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 3 Individual PAR reading for each PAR sensor 3; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 4 Individual PAR reading for each PAR sensor 4; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 5 Individual PAR reading for each PAR sensor 5; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 6 Individual PAR reading for each PAR sensor 6; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 7 Individual PAR reading for each PAR sensor 7; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 8 Individual PAR reading for each PAR sensor 8; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 9 Individual PAR reading for each PAR sensor 9; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 10 Individual PAR reading for each PAR sensor 10; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 11 Individual PAR reading for each PAR sensor 11; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 12 Individual PAR reading for each PAR sensor 12; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 13 Individual PAR reading for each PAR sensor 13; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 14 Individual PAR reading for each PAR sensor 14; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 15 Individual PAR reading for each PAR sensor 15; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 16 Individual PAR reading for each PAR sensor 16; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 17 Individual PAR reading for each PAR sensor 17; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 18 Individual PAR reading for each PAR sensor 18; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 19 Individual PAR reading for each PAR sensor 19; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 20 Individual PAR reading for each PAR sensor 20; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 21 Individual PAR reading for each PAR sensor 21; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 22 Individual PAR reading for each PAR sensor 22; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 23 Individual PAR reading for each PAR sensor 23; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 24 Individual PAR reading for each PAR sensor 24; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 25 Individual PAR reading for each PAR sensor 25; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 26 Individual PAR reading for each PAR sensor 26; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 27 Individual PAR reading for each PAR sensor 27; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 28 Individual PAR reading for each PAR sensor 28; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 29 Individual PAR reading for each PAR sensor 29; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 30 Individual PAR reading for each PAR sensor 30; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 31 Individual PAR reading for each PAR sensor 31; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 32 Individual PAR reading for each PAR sensor 32; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 33 Individual PAR reading for each PAR sensor 33; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 34 Individual PAR reading for each PAR sensor 34; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 35 Individual PAR reading for each PAR sensor 35; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 36 Individual PAR reading for each PAR sensor 36; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 37 Individual PAR reading for each PAR sensor 37; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 38 Individual PAR reading for each PAR sensor 38; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 39 Individual PAR reading for each PAR sensor 39; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 40 Individual PAR reading for each PAR sensor 40; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 41 Individual PAR reading for each PAR sensor 41; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 42 Individual PAR reading for each PAR sensor 42; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 43 Individual PAR reading for each PAR sensor 43; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 44 Individual PAR reading for each PAR sensor 44; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 45 Individual PAR reading for each PAR sensor 45; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 46 Individual PAR reading for each PAR sensor 46; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 47 Individual PAR reading for each PAR sensor 47; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 48 Individual PAR reading for each PAR sensor 48; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 49 Individual PAR reading for each PAR sensor 49; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 50 Individual PAR reading for each PAR sensor 50; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 51 Individual PAR reading for each PAR sensor 51; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 52 Individual PAR reading for each PAR sensor 52; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 53 Individual PAR reading for each PAR sensor 53; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 54 Individual PAR reading for each PAR sensor 54; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 55 Individual PAR reading for each PAR sensor 55; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 56 Individual PAR reading for each PAR sensor 56; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 57 Individual PAR reading for each PAR sensor 57; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 58 Individual PAR reading for each PAR sensor 58; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 59 Individual PAR reading for each PAR sensor 59; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 60 Individual PAR reading for each PAR sensor 60; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 61 Individual PAR reading for each PAR sensor 61; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 62 Individual PAR reading for each PAR sensor 62; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
PAR 63 Individual PAR reading for each PAR sensor 63; (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
tip-PAR 64 Individual PAR reading for each PAR sensor 64; "tip" indicates end of wand, furthest from the field technician (umol PAR per square m per sec) number micromolePerMeterSquaredPerSecond     NaN=Missing or Not Measured
HEIGHT FROM GROUND Where applicable, the height of the SunScan wand above the ground (cm above soil) text        
LIGHT CONDITION Where applicable, the light condition for the SunScan wand measurements text      
NOTES and ROW# For SunScan measurements, the row number indicating repetition number (1-3) or comments about the measurement text      
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