4.3

New foreign continuum coefficients in window regions for wavenumbers greater than 4000 cm-1 were derived (Mlawer and Mascio) using a modification to the MT_CKD line shape formalism that was constrained by results from the following studies from the U. Grenoble group led by A. Campargue:

• Mondelain et al. (2015), doi:10.1039/c5cp01238d
• Vasilchenko et al. (2019), .doi:10.1016/j.jqsrt. 2019.02.01
• Mondelain et al. (2020), doi:10.1016/j.jqsrt.2020.106923
• Fleurbaey et al. (2022), doi.org/10.1016/j.jqsrt.2021.108004
• Koroleva et al. (2023), doi.org/10.1016/j.jqsrt.2022.108432

4.2

Changes to self, foreign, and self T-dependence in IR window (590-1400 cm-1) derived from AERI (Mlawer/Mascio/Turner).

**First released in December 2023; re-released with minor changes to netCDF and make_cntnm file.

4.1.1

Minor changes to 4.1

**First released in January 2023; re-released with minor changes to netCDF.

4.1

Revised foreign H2O continuum in Far-IR to adjust for MT_CKD_3.5 changes to self.

**First released in January 2023; re-released with minor changes to netCDF.

4.0.1

Added changes to handle negative frequencies for water vapor.

4.0

The water vapor continuum code has been restructured for its inclusion in HITRAN and put in separate module. The absorption coefficients are now in an external (netCDF) file and the code contains only simple scaling and interpolation operations. The full continuum code (contnm.f90) has been modified to call the new water vapor continuum code (K.E. Cady-Pereira, E. Mlawer).

v3.6

The water vapor self continuum temperature dependence is now computed as a power law, where the exponent is determined from existing behavior between 270-305K

v3.5

• The water vapor continuum in the microwave through far-infrared was modified (E. Mlawer, V. Payne, J. Mascio, D. Turner). The modifications will be detailed in Payne _et al._ (2021).
  • Revised self and foreign continuum coefficients in the microwave were derived based on DOE ARM MWR measurements using an approach similar to that in Payne _et al._ (2010). The temperature dependence of the self continuum in the microwave was modified based on Katkov _et al._ (1995), Tretyakov _et al._ (2016) and the ARM MWR analysis.
  • The self continuum in the far-infrared was revised based on Odintsova _et al._ (2020), and the temperature dependence of the self continuum is based on Odintsova _et al._ (2020) and Burch and Grynvak (1979). Beyond the far-IR (up to 800 cm^-1), the self temperature dependence was revised based on Burch and Alt (1984) and Burch and Grynvak (1979).
• A bugfix in the oxygen A-band continuum module was implemented (E. Mlawer, J. Mascio, E. Magee).

v3.4

• Collision-induced absorption in the oxygen A-band was modified to be consistent with OCO-2 ABSCO 5.1 (E.J. Mlawer, J. Mascio, V.H. Payne, B. Drouin, F. Oyafuso)

v3.3

• Added O₂ Schumann-Runge continuum from 55000-87000 cm^-1 based on Lu et al. (2010), with adjustments made to account for optical depths due to Schumann-Runge lines (E. Mlawer)
• Extended Rayleigh down to 820 cm^-1 (K. Cady-Pereira, J. Delamere)