Updated Spectroscopic Parameters for H2O, CO2, CH4, and O2: Toward the HITRAN2020 Database

The quality of reference spectroscopic parameters (and their completeness) for H₂O, CO₂, CH₄ and O₂ in the 2016 edition of the HITRAN spectroscopic database [1] have proven to be an improvement over previous editions when applied to atmospheric remote sensing. Nevertheless, in some spectral regions further improvements are needed to satisfy the ever-growing demands of the remote-sensing community.

The work on these improvements is well underway, while some have already been made available on www.hitran.org. HITRAN2020 will take advantage of the most recent measurements and calculations (from many laboratories worldwide) not only for the “standard” HITRAN parameters, but also for non-Voigt line profiles; broadening by partial pressure of ambient water vapor and other phenomena, including line mixing. At this meeting we will report some of the updates that have the most important impact on current and future remote-sensing missions that target greenhouse gases CO₂ and CH₄ and employ different bands of oxygen for benchmarking. Knowledge of accurate spectroscopic parameters of the interfering water vapor lines is also of paramount importance for these missions.

This work is supported by the NASA AURA (NNX 17AI78G) program.

References

[1] I.E. Gordon et al, JQSRT (2017) http://doi.org/10.1016/j.jqsrt.2017.06.038.