Abstract
The present paper describes a UV-VIS spectroradiometer named GASCOD/A4r developed at ISAC-CNR for remote sensing measurements aboard stratospheric M55-Geophysica aircraft, flying up to 21 km. Obtained experimental data are used for retrieving of NO2, O3 and of other minor gases atmospheric content, applying the DOAS (Differential Optical Absorption Spectroscopy) method. UV actinic flux and J(NO2) are also derived. All these parameters are used for satellite data validation tasks. The specific results obtained during dedicated aircraft missions in different geographical areas have already been utilized for ENVISAT validation.
Highlights
The current state of the Earth’s climate and its future development under different scenarios has been a subject of increasing interest in the international scientific community over the last decade
GASCOD/A4r was initially developed as a ground-based instrument (Bonasoni et al.,1993; Evangelisti et al, 1995; Giovanelli et al, 1998), implementing the DOAS measurement technique
Space restrictions aboard M55-Geophysica aircraft and requirements for spectrometric instruments have been taken into account and GASCOD/A4r has been designed as a two-unit device
Summary
The current state of the Earth’s climate and its future development under different scenarios has been a subject of increasing interest in the international scientific community over the last decade. There are large unpopulated geographical areas, where ground-based measurements for validation tasks cannot be performed and only balloon and aircraft measurements can provide the possibility of enlarging the validation areas In this regard the validation campaigns of satellite remote sensors, with the participation of airborne instruments, would appear to be essential for continuing satellite payload characterization. Notwithstanding the efforts of scientists to reproduce space conditions in the laboratory during preflight tests, there are still factors which cannot be forecast and/or simulated correctly For this reason it is necessary to perform specific tests after the launch to supply a complete characterization of the behaviour of the satellite instruments. For this reason the development of instruments, which perform simultaneous measurements within spaceborne instrumental FoVs, is considered as an advanced approach towards this end
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