Journal
OPTICA
Volume 1, Issue 5, Pages 290-298Publisher
OPTICAL SOC AMER
DOI: 10.1364/OPTICA.1.000290
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- National Institute of Standards and Technology (NIST)
- National Research Council
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Increasing our understanding of regional greenhouse gas transport, sources, and sinks requires accurate, precise, continuous measurements of small gas enhancements over long ranges. We demonstrate a coherent dual frequency-comb spectroscopy technique capable of achieving these goals. Spectra are acquired spanning 5990 to 6260 cm(-1) (1600-1670 nm) covering similar to 700 absorption features from CO2, CH4, H2O, HDO, and (CO2)-C-13, across a 2 km path. The spectra have sub-1-kHz frequency accuracy, no instrument lineshape, and a 0.0033 cm(-1) point spacing. They are fit with different absorption models to yield dry-air mole fractions of greenhouse gases. These results are compared with a point sensor under well-mixed conditions to evaluate the accuracy of models critical to global satellite-based trace gas monitoring. Under heterogeneous conditions, time-resolved data demonstrate tracking of small variations in mole fractions, with a precision <1 ppm for CO2 and <3 ppb for CH4 in 5 min. Portable systems could enable regional monitoring. (C) 2014 Optical Society of America
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