2020/12/23 by Fabrizio R. Giorgetta, Jeff Peischl, Giorgetta, Fabrizio R. +11
Chemical Engineering · Chemistry · Physics and Astronomy · #Advanced Fiber Laser Technologies #Analytical Chemistry and Sensors #Atmospheric and Oceanic Physics (physics.ao-ph) #FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det) #Optics (physics.optics) #Spectroscopy and Laser Applications
paper · pdf · doi:10.48550/arxiv.2012.12427
openalex publication_date 2020/12/23 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28
Open-path dual-comb spectroscopy provides multi-species atmospheric gas concentration measurements with high precision. Here, we extend open-path dual comb spectroscopy 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 criterion air pollutants O3 and CO across 600 m and 2 km round-trip paths. We demonstrate measurements over a five-day period at two-minute 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 co-located point sensor. In addition, the retrieved ratio of excess CO vs CO2 agrees with similar urban studies but disagrees with the US National Emission Inventory by a factor of 3. Our retrieved ratio of excess N2O vs CO2 exhibits a plume-dependent value, indicating the variability of sources of the greenhouse gas N2O.