Heidelberg 2015 – wissenschaftliches Programm
UP 13.6: Poster
Donnerstag, 26. März 2015, 10:45–19:45, G/Foyer
Discrete field of view sampling of satellite and ground-based DOAS-type instruments using high-resolution imager data — •Holger Sihler1, Steffen Beirle1, Peter Lübcke2, Julia Remmers1, and Thomas Wagner1 — 1Max Planck Institute for Chemistry, Mainz, Germany — 2Institute of Environmental Physics, Heidelberg, Germany
The field of view (FOV) describes the spatial sensitivity distribution of optical instruments. In particular, its knowledge is essential for the interpretation of spectroscopic measurements of the earths atmosphere and surface. Spectroscopic instruments, like those designed for Differential Optical Absorption Spectroscopy (DOAS), typically feature a much lower spatial resolution than instruments with moderate to low spectral resolution in order to provide a sufficient signal-to-noise ratio physically limited by photon statistics.
In principle, the instrument's FOV can be either characterised under controlled conditions (i.e. in the lab) or simulated using ray tracing. In reality, however, the FOV may change during launch of a satellite-borne instrument or when a ground-based instrument is transported into the field.
We present a method to assess the FOV of spectroscopic DOAS-type instruments during operation using simultaneously recorded imager data. As a proof of concept, the method is applied to investigate the FOV of the GOME-2 (Global Ozone Monitoring Experiment 2) satellite instrument using simultaneous Advanced Very High Resolution Radiometer (AVHRR) measurements.