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• W119254445 abstract "The albedo of two wheat fields was measured throughout the 2001 growing season. In response to the maturing crop, the daily albedo increased by approximately 12 percent from seeding to harvest. Before the fields were seeded, the daily albedo was related to the organic litter that remained on the surface from the previous year's harvest; the average daily albedo was 0.173 and 0.161 for the north and south fields respectively. Following cultivation (May 15), the albedo decreased to 0.093 and 0.109 for the north and south fields. The wheat crop emerged on May 27, but the albedo was not solely that of the vegetation until the extended height of the wheat was 0.12 m on June 7. After this date, the albedo increased daily as the wheat crop matured. The albedo reached a plateau (= 0.17) on July 8, and this coincided with the peak of plant fresh weights and the emergence of wheat heads. The albedo began to increase during the week of July 31 and this was related to crop senescence. When the crop was harvested at the end of the growing season, the albedo was approximately 0.22. Several diurnal albedo trends occurred throughout the growing season. The albedo was symmetrical around solar noon on cloudless and overcast days when the crop canopy dominated the surface condition. The albedo was asymmetrical around solar noon when transmissivity or the surface condition varied during the day. Albedo asymmetry between morning and afternoon regimes was most prominent early in the growing season (up to the end of the emergence stage), and the asymmetry was usually associated with the period following the formation of dew. Insight into the behaviour of half-hour albedos throughout the growing season permitted an independent test of the use of exponential regression equations to estimate half-hour albedos along with the albedo model employed in the Canadian Land Surface Scheme (CLASS). The regression equations tended to overestimate the albedo at" @default.
• W119254445 created "2016-06-24" @default.
• W119254445 creator A5045769837 @default.
• W119254445 date "2004-01-01" @default.
• W119254445 modified "2023-09-25" @default.
• W119254445 title "Diurnal and seasonal albedo trends of wheat at the Bratt's Lake Observatory, Saskatchewan" @default.
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• W119254445 hasPublicationYear "2004" @default.
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