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Utqiagvik (formerly Barrow), Alaska Oil Spill Sites Leaf Spectral Reflectance Data
Alaska, USA, 2018

Data authors: Sergio Vargas Zesati (1), Craig E. Tweedie (1), Karl F. Huemmrich (2), Petya Campbell (2)

1. System Ecology Lab, University of Texas at El Paso
2. University of Maryland Baltimore County, NASA Goddard Space 	Flight Center

Funding from: NASA ABoVE (Grant # NNX17AC58A)

Version: 2018-05-18

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CONTENTS

1.       Data overview
2.       Use of data
3. 	   Temporal and spatial characteristics
4.       File information

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1. DATA OVERVIEW

This dataset represents full spectrum (i.e. 350 - 2500nm) leaf spectral reflectance data for species located at the site of oil spills near Utqiagvik, Alaska. Scans were collected in a controlled lab setting using a HR-1024i spectrometer, leaf-clip and fibers. Samples were collected and scanned on the same day during the 2017 summer growing season and acquired data were calibrated using a Spectralon white reference panel included in the leaf clip. ***Warning*** Some dates might be missing scans due to either bad data and/or as a result of data QC efforts. 

Data Uncertainty: 
No specific quality assessment information is provided.

Correspondence concerning these data should be directed to:
Dr. Sergio A. Vargas Zesati
University of Texas at El Paso
Systems Ecology Lab
500 W. University Ave. 
El Paso, Texas, 79968

email:  savargas@utep.edu
	  ctweedie@utep.edu


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2. USE OF DATA

These data are made freely available to the public and the scientific community in the belief that their wide dissemination will lead to greater understanding and new scientific insights.

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3. TEMPORAL AND SPATIAL CHARACTERISTICS

Temporal range: 2017-06-17 to 2017-08-22
Temporal resolution / sampling frequency: 1 time during the field season

Geographic location / Transect boundaries:
Westernmost Longitude:  -156.648319°
Easternmost Longitude:  -156.611289°
Northernmost Latitude:    71.341857°
Southernmost Latitude:    71.335588°

Site description:
Approximately 7 kilometers Northeast of Utqiagvik, Alaska there are two sites which have been contaminated by previous minor oil spills. The first is an old, 1.5 kilometer long Navy runway which is no longer in use. The second is a now-unused boat ramp located on the northern shore of the North Salt Lagoon, which feeds into the nearby Elson Lagoon. Leaf samples for spectral reflectance analysis were collected from various species found growing near or at these locations. 

Spatial resolution: leaf level spectral reflectance samples

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4. FILE INFORMATION

Data file format: comma-separated text (.csv)

Data file description: The first row in each csv data file represents the wavelength (nm) and each row following thereafter is each plot or scan and are identified using the Unique_ID in column A, which is linkable with the metadata spreadsheet information (see below). The coordinates provided in the metadata spreadsheet were acquired using either a DGPS or handheld GPS.

Metadata file description: Each scan or data record is stored by row and is assigned a Unique_ID, which can be used to query a particular measurement as detailed as by day and/or time of day. As seen in the metadata sheet, the Unique_ID column is basically composed of the first 8 columns of metadata which include the “Location”, “Site_Name”, “Target_Name”, “Target_Scale_Level” (e.g. plot (PL), leaf (LF) etc.), “Measurement_Julian_Day”, “Measurement_Time_Of_Day”, “Measurement_Year”, and “Measurement_Type” (e.g. reflectance (REFL), radiance (RAD) etc.). 

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