NIST has developed high-accuracy spectroscopic reference data for measuring atmospheric greenhouse gases, which is crucial for climate science. The data includes transition frequencies, intensities, and line shape parameters for gases like CO2, CH4, H2O, and N2O. This enables precise measurements using satellite and ground-based spectrometers, improving remote sensing models and carbon dioxide monitoring.
NIST has significantly reduced uncertainties for CO2 and O2 line shape parameters, with line intensity measurements having uncertainties of 0.1% to 0.3%. Transition frequencies are measured with kHz-level uncertainties using advanced techniques like cavity ring-down spectroscopy, Cs-clock-referenced optical frequency combs, and photoacoustic spectrometry. The data supports various applications in climate science, meteorology, weather modeling, and satellite-based greenhouse gas monitoring.
Keywords: spectroscopic parameters, greenhouse gases, remote sensing
