Canopy Reflectance at the Oklahoma ARM-CART Research Site
1999 Summary


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1999 Photos Updated October 5, 1999 

1999 Summary for Canopy Bidirectonal Reflectance and Related Field Measurements in Native Tallgrass Prairie and Wheat Ecosystems in Oklahoma

Canopy & Soil Reflectance 

Date Day of Year Apparent Solar Zenith Angles (degrees) Photos Figures
Wheat Site (36.77 N, 97.13 W)
March 25, 1999 84 45, 55 X, Off Nadir X
April 19, 1999 109 55,45,35 X  
May 8, 1999 128 55,45,35,25 X, Off Nadir  
May 18-19, 1999 138-139 25,35,45--55 X  
May 26, 1999 146 25,35,45,55 X, Off Nadir X
August 14, 1999 226 Soil: 55, 45, 35, 25 X, Off Nadir  
Tall Grass Prairie (36.93 N, 96.68 W)
 April 19, 1999 109  35,45, 55  X  
May 7, 1999 127 55,45,35,25 X, Off Nadir  
May 18, 1999 138 55,45,35,25 X  
July 3, 1999 184 25, 35, 45, 55 X  
July 13, 1999 194 Canopy: 55, 45, 35, 25, Solar Noon X, Off Nadir  
Soil: 25, 35, 45, 55 X, Off Nadir (soil)  
August 13, 1999 225 55, 45, 35, 25 X, Off Nadir  
October 1, 1999 274 55,45 X  

Leaf Optical Properties

Date Day of Year Species or Plant Element
Wheat Site
March 25, 1999 84 Green leaves
April 20, 1999 110 Top most Green leaves
May 8, 1999 128 Green and Brownish-Yellow Leaves & Grain Head
May 18, 1999 138 Green and Brownish-Yellow Leaves & Grain Head
May 26, 1999 146 Green Stems, Brownish-Yellow Leaves & Grain Head
Tall Grass Prairie
 May 7, 1999  127 Wild Alfalfa, Goldenrod, Milkweed 
May 19, 1999 139 Wild Alfalfa, Goldenrod, Milkweed, Indiangrass
June 14, 1999 165 Wild Alfalfa, Goldenrod, Milkweed, Indiangrass, Switchgrass, Little bluestem
July 4, 1999 184 Goldenrod, Milkweed, Indiangrass, Switchgrass, Little bluestem
August 12, 1999 224 Goldenrod, Switchgrass (green and brown leaves), Little bluestem, Big bluestem, Dropseed, Indiangrass
September 23, 1999 266 Goldenrod, Switchgrass( green and brown leaves), Little bluestem, Big bluestem, Indiangrass

fAPAR

Date Day of Year Measurement Period (Local Time)
Wheat Site
March 25, 1999 84 1300-1600
April 19, 1999 109 800-2000
May 8, 1999 128 830-1400
May 18, 1999 138 1400-1800
May 26, 1999 146 1430-1930
Tall Grass Prairie
 April 19, 1999 109 Continuous since  April 19, 1999

 

Copyright 1998-2000.

Information contacts:
Dr. Elizabeth Walter-Shea: ewalter-shea1@unl.edu or 402-472-1553 or 402-472-3679
Mr. Mark A. Mesarch: mmesarch1@unl.edu or 402-472-5904

School of Natural Resource Sciences; University of Nebraska-Lincoln
246 LW Chase Hall
Lincoln, NE 68583-0728