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- Title
Open‐Path Dual‐Comb Spectroscopy for Multispecies Trace Gas Detection in the 4.5–5 µm Spectral Region.
- Authors
Giorgetta, Fabrizio R.; Peischl, Jeff; Herman, Daniel I.; Ycas, Gabriel; Coddington, Ian; Newbury, Nathan R.; Cossel, Kevin C.
- Abstract
Open‐path dual‐comb spectroscopy provides multispecies atmospheric gas concentration measurements with high precision. Here, open‐path dual‐comb spectroscopy is extended to the mid‐infrared 5 µm atmospheric window, enabling atmospheric concentration retrievals of the primary greenhouse gases, N2O, CO2, and H2O, as well as the criteria air pollutants O3 and CO across 600 m and 2 km round‐trip paths. Measurements are demonstrated over a five‐day period at 2 min temporal resolution with 80% uptime. The achieved precision is sufficient to resolve the atmospheric concentration variations of the multiple gas species; retrieved dry mixing ratios of CO and N2O are in good agreement with a colocated point sensor. In addition, the retrieved ratio of excess CO versus CO2 agrees with similar urban studies but disagrees with the US National Emission Inventory by a factor of 3. The retrieved ratio of excess N2O versus CO2 exhibits a plume‐dependent value, indicating the variability of sources of the greenhouse gas N2O.
- Subjects
ATMOSPHERIC carbon dioxide; GREENHOUSE gases; SPECTROMETRY; AIR pollutants; PHOTOACOUSTIC spectroscopy; EMISSION inventories; TRACE gases; CARBON dioxide
- Publication
Laser & Photonics Reviews, 2021, Vol 15, Issue 9, p1
- ISSN
1863-8880
- Publication type
Article
- DOI
10.1002/lpor.202000583