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Thermal Characteristics of Pyranometers and Pyrgeometers in Atmosphere-Surface Energetic MeasurementsSince the introduction of thermopile, pyranometers (solar, e.g., 0.3 - 3.0 microns) and pyrgeometers (terrestrial, e.g., 4 - 50 microns) have become instruments commonly used for measuring the broadband hemispherical irradiances at the surface in a long-term, monitoring mode for decades. These commercially available radiometers have been manufactured in several countries such as from the United States, Asia, and Europe, and are generally reliable and economical. These worldwide distributions of surface measurements become even more important in the era of Earth remote sensing in studying climate change. However, recent studies from field campaigns have pointed out that erroneous factors (e.g., temperature gradients between the filter dome and detector, emissivity of the thermopile) are responsible for the unacceptable level of uncertainty (e.g., 20 W/sq m). It is best to utilize an energy balance equation to describe the thermal dome effect of pyranometers and pyrgeometers. Therefore, quality of pyranometer and pyrgeometer measurements can be improved largely by applying proper knowledge of the thermal parameters affecting the operation of the thermopile systems. Data correction procedure and algorithm will be presented and discussed.
Document ID
20000109708
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Tsay, Si-Chee
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Einaudi, Franco
Date Acquired
August 19, 2013
Publication Date
January 1, 2000
Subject Category
Instrumentation And Photography
Meeting Information
Meeting: National Central University, ACE-Asia Workshop
Location: Chung-Li
Country: Taiwan, Province of China
Start Date: July 17, 2000
End Date: July 21, 2000
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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