ASCE will be sunsetting the Civil Engineering Database (CEDB) in the coming months. We encourage you to start using the ASCE Library to perform content searches. In the ASCE Library, you can save your search results as well as receive email content alerts when new content relevant to your area of interest is published. Try it out today at https://ascelibrary.org.

 

Atmospheric Radiation Balance Over Alfalfa

by Gail E. Bingham,
Esmaiel Malek,



Document Type: Proceeding Paper

Part of: Management of Irrigation and Drainage Systems: Integrated Perspectives

Abstract:

An experiment was carried out in an alfalfa field in Logan, Utah, U.S.A., during 8-12 September 1992, to evaluate methods and expected accuracy of continuous radiation balance component determination in mountainous terrain. Four different types of pyranometers were used to evaluate the measurement of incoming solar radiation (R_si). An inverted pyranometer was employed to measure the reflected (outgoing) solar radiation (R_so). Two Q-6 net radiometers measured the net radiation (R_n). Three pyrgeometers were used to measure the incoming longwave (atmospheric) radiation (R_li). An infrared thermometer were used to measure the crop surface temperature (T_c). The radiation balance was calculated and compared with the measured net radiation. Statistical analysis showed that, while good overall agreement between the two methods was observed, slight differences occurred between pyrgeometers. The multiple sensor exercise proved fruitful in demonstrating likely calibration errors, while the technique provided value in data quality assurance. Incoming longwave radiation was slightly different from standard estimation techniques.

Subject Headings: Solar radiation | Temperature measurement | Measuring instruments | Vegetation | Radiation | Statistics | Crops | Utah | United States

Services: Buy this book/Buy this article

 

Return to search