The Sky Differential Optical Absorption Spectroscopy (SkyDOAS) method is used to map and quantify gas emissions from the large industrial conglomerates down to individual sources. It is able to efficiently screen large areas of the site and identify significant sources.

The three major goals of CINDI-2 were (1) to characterise and better understand the differences between a large number of multi-axis differential optical absorption spectroscopy (MAX-DOAS) and zenith-sky DOAS instruments and analysis methods, (2) to define a robust methodology for performance assessment of all participating instruments, and (3 ...

Zenith-sky scattered sunlight observations using differential optical absorption spectroscopy (DOAS) technique were carried out in Shanghai, China (31.3° N, 121.5° E) since December 2006. At this polluted urban site, the measurements provided NO 2 total columns in the daytime.

In atmospheric chemistry, differential optical absorption spectroscopy (DOAS) is used to measure concentrations of trace gases. When combined with basic optical spectrometers such as prisms or diffraction gratings and automated, ground-based observation platforms, it presents a cheap and powerful means for the measurement of trace gas species ...

2021年5月25日 · sky UV-visible differential slant column density measure-ments was proposed for deriving NO 2 vertical distribution and total column amounts [Schofield et al., 2004]. [7] The DOAS method retrieves the ‘‘slant-path optical depth spectrum’’, i.e., the optical depth as a function of wavelength along the average path of the measured photons

Differential Optical Absorption Spectroscopy (DOAS) is a widely used inversion method for the retrieval of atmospheric trace gas abundances from multi-wavelength light measurements. It uses the structured absorption of many trace gases in the UV, visible and near-infrared spectral ranges.

S3 Description and technical characteristics of the CINDI-2 MAX-DOAS and zenith-sky DOAS systems This section presents the description of all the participating instruments. The following colour coding is used for the different types: yellow for Zenith-sky DOAS, blue for 1D MAX-DOAS and green for 2D MAX-DOAS. The

Zenith-sky scattered sunlight observations using differential optical absorption spectroscopy (DOAS) technique were carried out in Shanghai, China (31.3° N, 121.5° E) since December 2006. At this polluted urban site, the measurements provided NO2 total columns in the daytime.

The AirYX SkySpec 2D is a multi-axis differential optical absorption spectrometer (MAX-DOAS) measuring multiple trace gases in the UV-VIS spectral range. As implied by the name, scans are taken in both azimuth and zenith angles, allowing for a full hemisphere scan.

BIRA-IASB operates there fully automated zenith-sky DOAS instruments since 1998. The station is also equipped with a high-resolution FTIR spectrometer operated by the Department of Radio and Space Science, Chalmers University of Technology, Gothenburg.