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- Title
A portable reflected-sunlight spectrometer for CO2 and CH4.
- Authors
Löw, Benedikt A.; Kleinschek, Ralph; Enders, Vincent; Sander, Stanley P.; Pongetti, Thomas J.; Schmitt, Tobias D.; Hase, Frank; Kostinek, Julian; Butz, André
- Abstract
Mapping the greenhouse gases (GHGs) carbon dioxide (CO 2) and methane (CH 4) above source regions such as urban areas can deliver insights into the distribution and dynamics of local emission patterns. Here, we present the prototype development and an initial performance evaluation of a portable spectrometer that allows for measuring CO 2 and CH 4 concentrations integrated along a long (>10 km) horizontal path component through the atmospheric boundary layer above a target region. To this end, the spectrometer is positioned at an elevated site from which it points downward at reflection targets in the region, collecting the reflected sunlight at shallow viewing angles. The path-integrated CO 2 and CH 4 concentrations are inferred from the absorption fingerprint in the shortwave–infrared (SWIR) spectral range. While mimicking the concept of the stationary California Laboratory for Atmospheric Remote Sensing – Fourier Transform Spectrometer (CLARS-FTS) in Los Angeles, our portable setup requires minimal infrastructure and is straightforward to duplicate and to operate in various locations. For performance evaluation, we deployed the instrument, termed EM27/SCA, side by side with the CLARS-FTS at the Mt. Wilson Observatory (1670 m a.s.l.) above Los Angeles for a 1-month period in April/May 2022. We determined the relative precision of the retrieved slant column densities (SCDs) for urban reflection targets to be 0.36 %–0.55 % for O 2 , CO 2 and CH 4 , where O 2 is relevant for light path estimation. For the partial vertical column (VCD) below instrument level, which is the quantity carrying emission information, the propagated precision errors amount to 0.75 %–2 % for the three gases depending on the distance to the reflection target and solar zenith angle. The comparison to simultaneous CLARS-FTS measurements shows good consistency, but the observed diurnal patterns highlight the need to take light scattering into account to enable detection of emission patterns.
- Subjects
LOS Angeles (Calif.); ATMOSPHERIC boundary layer; FOURIER transform spectrometers; IR spectrometers; SPECTROMETERS; GREENHOUSE gases; CARBON dioxide; LIGHT scattering
- Publication
Atmospheric Measurement Techniques, 2023, Vol 16, Issue 21, p5125
- ISSN
1867-1381
- Publication type
Article
- DOI
10.5194/amt-16-5125-2023