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- W4297946277 abstract "We demonstrate coherent dual frequency-comb spectroscopy for detecting variations in greenhouse gases. High signal-to-noise spectra are acquired spanning 5990 to 6260 cm^-1 (1600 to 1670 nm) covering ~700 absorption features from CO2, CH4, H2O, HDO, and 13CO2, across a 2-km open-air path. The transmission of each frequency comb tooth is resolved, leading to spectra with <1 kHz frequency accuracy, no instrument lineshape, and a 0.0033-cm^-1 point spacing. The fitted path-averaged concentrations and temperature yield dry-air mole fractions. These are compared with a point sensor under well-mixed conditions to evaluate current absorption models for real atmospheres. In heterogeneous conditions, time-resolved data demonstrate tracking of strong variations in mole fractions. A precision of <1 ppm for CO2 and <3 ppb for CH4 is achieved in 5 minutes in this initial demonstration. Future portable systems could support regional emissions monitoring and validation of the spectral databases critical to global satellite-based trace gas monitoring." @default.
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- W4297946277 date "2014-06-12" @default.
- W4297946277 modified "2023-10-15" @default.
- W4297946277 title "Frequency Comb-Based Remote Sensing of Greenhouse Gases over Kilometer Air Paths" @default.
- W4297946277 doi "https://doi.org/10.48550/arxiv.1406.3326" @default.
- W4297946277 hasPublicationYear "2014" @default.
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