<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Toward Urban Greenhouse Gas Mapping with a Portable Reflected Sunlight Spectrometer"^^ . "Urban regions are major sources of CO2 and CH4. Although their emissions are substantial, the quantification is challenged by the complex spatial distribution of sources. Groundbased remote sensing using reflected sunlight can address this challenge. For this purpose, a spectrometer is positioned above a source region, pointing towards ground targets at a shallow angle. It records solar absorption spectra containing information on CO2 and CH4 abundances integrated along the light path. Because of the extended quasi-horizontal light path component, the measurements are sensitive to near-ground concentrations and representative of urban enhancements. By repeatedly scanning through multiple targets, the method enables the mapping of temporal and spatial source patterns. This work presents the EM27/SCA, the first portable ground-based Fourier-transform spectrometer (FTS) designed for urban greenhouse gas mapping using near-infrared spectra of ground-scattered sunlight. The performance of the remote sensing setup is demonstrated through an instrument deployment on Mt. Wilson looking into the Los Angeles basin, USA. The precision of the retrieved CO2, CH4 and O2 slant column densities is in the range of 0.4% to 0.5%. The comparison to a more precise but stationary reflected-sun viewing FTS shows overall good agreement but also limited systematic deviations. The measurements reveal atmospheric scattering to be the major error source. A retrieval algorithm is implemented, which explicitly accounts for aerosol scattering and mitigates the scattering-induced bias. This allows the detection of urban enhancement patterns in the EM27/SCA measurements of the Los Angeles basin."^^ . "2024" . . . . . . . "Benedikt Alexander"^^ . "Löw"^^ . "Benedikt Alexander Löw"^^ . . . . . . "Toward Urban Greenhouse Gas Mapping with a Portable Reflected Sunlight Spectrometer (PDF)"^^ . . . "Loew_Benedikt_Dissertation.pdf"^^ . . . "Toward Urban Greenhouse Gas Mapping with a Portable Reflected Sunlight Spectrometer (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Toward Urban Greenhouse Gas Mapping with a Portable Reflected Sunlight Spectrometer (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Toward Urban Greenhouse Gas Mapping with a Portable Reflected Sunlight Spectrometer (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Toward Urban Greenhouse Gas Mapping with a Portable Reflected Sunlight Spectrometer (Other)"^^ . . . . . . "small.jpg"^^ . . . "Toward Urban Greenhouse Gas Mapping with a Portable Reflected Sunlight Spectrometer (Other)"^^ . . . . . . "indexcodes.txt"^^ . . "HTML Summary of #35155 \n\nToward Urban Greenhouse Gas Mapping with a Portable Reflected Sunlight Spectrometer\n\n" . "text/html" . . . "530 Physik"@de . "530 Physics"@en . .