The GASCOD/A4pi instrument is a spectroradiometer designed to operate in the 300-800 nm spectral region. An optical system selects the monochromator input between five channels: one for zenith scattered solar radiation (for DOAS measurement), two for diffused radiation through two side windows and another two for radiometric measurements through two 2pi-optical heads. Mounting the instrument upon an aircraft the last two channels make it possible to perform upward and downward irradiance measurements and consequently to compute photodissociation coefficients (J-values). The GASCOD/A4pi has recently been installed on board the MS5-GEOPHYSICA airplane, a stratospheric research platform capable of flying at altitudes of up to 20 Km and it performed measurements during the APE-GAIA campaign that took place in Argentina (Ushuaia) in September-October 1999. The instrument as well as the elaboration method will be described and some results for DOAS measurements presented.
Preliminary results from GASCOD/A4pi spectroradiometer during APE-GAIA campaign
Giovanelli G;Ravegnani F;Bortoli D;
2000
Abstract
The GASCOD/A4pi instrument is a spectroradiometer designed to operate in the 300-800 nm spectral region. An optical system selects the monochromator input between five channels: one for zenith scattered solar radiation (for DOAS measurement), two for diffused radiation through two side windows and another two for radiometric measurements through two 2pi-optical heads. Mounting the instrument upon an aircraft the last two channels make it possible to perform upward and downward irradiance measurements and consequently to compute photodissociation coefficients (J-values). The GASCOD/A4pi has recently been installed on board the MS5-GEOPHYSICA airplane, a stratospheric research platform capable of flying at altitudes of up to 20 Km and it performed measurements during the APE-GAIA campaign that took place in Argentina (Ushuaia) in September-October 1999. The instrument as well as the elaboration method will be described and some results for DOAS measurements presented.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
