Publication Date:
2023-01-19
Description:
A novel experimental procedure to measure the surface-near distribution of
atmospheric trace gases using passive Multi-Axis-Differential Absorption Optical
Spectroscopy (MAX-DOAS) is proposed. The idea consists of pointing the receiving
telescope of the spectrometer to non-reflecting surfaces or to ‘bright’ targets placed at known
distances from the measuring device, which are illuminated by sunlight. We show that the
partial trace gas absorptions between the top of the atmosphere and the target can be easily
removed from the measured total absorption. Thus it is possible to derive the average
concentration of trace gases like e.g. NO2, HCHO, SO2, H2O, Glyoxal, BrO and others along
the line of sight between the instrument and the target like for the well-known long-path
DOAS observations (but with much less expense). If tomographic arrangements are used,
even two- or three-dimensional trace gas distributions can be retrieved. The basic assumptions
of the proposed method are confirmed by test measurements across the city of Heidelberg.
Description:
Submitted
Description:
open
Keywords:
Tomographic MAX-DOAS
;
01. Atmosphere::01.01. Atmosphere::01.01.01. Composition and Structure
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
manuscript
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