Improved Correction of IR Loss in Diffuse Shortwave Measurements: An ARM Value-Added Product

Technical Report · Sat Nov 01 04:00:00 EST 2003

DOI:https://doi.org/10.2172/1020732· OSTI ID:1020732

Younkin, K; Long, CN

Simple single black detector pyranometers, such as the Eppley Precision Spectral Pyranometer (PSP) used by the Atmospheric Radiation Measurement (ARM) Program, are known to lose energy via infrared (IR) emission to the sky. This is especially a problem when making clear-sky diffuse shortwave (SW) measurements, which are inherently of low magnitude and suffer the greatest IR loss. Dutton et al. (2001) proposed a technique using information from collocated pyrgeometers to help compensate for this IR loss. The technique uses an empirically derived relationship between the pyrgeometer detector data (and alternatively the detector data plus the difference between the pyrgeometer case and dome temperatures) and the nighttime pyranometer IR loss data. This relationship is then used to apply a correction to the diffuse SW data during daylight hours. We developed an ARM value-added product (VAP) called the SW DIFF CORR 1DUTT VAP to apply the Dutton et al. correction technique to ARM PSP diffuse SW measurements.

• Research Organization: DOE Office of Science Atmospheric Radiation Measurement (ARM) Program (United States)
• Sponsoring Organization: USDOE EM Office of Science and Technology (EM-50)
• OSTI ID: 1020732
• Report Number(s): DOE/SC-ARM/TR-009
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
ACCURACY
ATMOSPHERIC CHEMISTRY
PYRANOMETERS
RADIATIONS