Multichannel radiometer calibration: a new approach.
The error in irradiance measured with Sun-calibrated multichannel radiometers may be large when the solar zenith angle (SZA) increases. This could be particularly detrimental in radiometers installed at mid and high latitudes, where SZAs at noon are larger than 50 degrees during part of the year. When a multiregressive methodology, including the total ozone column and SZA, was applied in the calculation of the calibration constant, an important improvement was observed. By combining two different equations, an improvement was obtained at almost all the SZAs in the calibration. An independent test that compared the irradiance of a multichannel instrument and a spectroradiometer installed in Ushuaia, Argentina, was used to confirm the results.
Diaz
Susana
S
Centro Austral de Investigaciones Científicas, Consejo Nacional de Investigaciones Científicas y Técnicas, B. Houssay 200, 9410 Ushuaia, Argentina. subediaz@speedy.com.ar
Booth
Charles R
CR
Armstrong
Roy
R
Brunat
Claudio
C
Cabrera
Sergio
S
Camilion
Carolina
C
Casiccia
Claudio
C
Deferrari
Guillermo
G
Fuenzalida
Humberto
H
Lovengreen
Charlotte
C
Paladini
Alejandro
A
Pedroni
Jorge
J
Rosales
Alejandro
A
Zagarese
Horacio
H
Vernet
Maria
M