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

Younkin, K ; Long, CN

Pacific Northwest National Laboratory (U.S.)

关键词: Atmospheric Chemistry;    Pyranometers;    54 Environmental Sciences;    Accuracy;    Radiations;   

DOI  :  10.2172/1020732
RP-ID  :  DOE/SC-ARM/TR-009
RP-ID  :  DE-AC05-7601830
RP-ID  :  1020732

美国|英语

来源: UNT Digital Library

【 摘 要 】

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.