The recent improvements in the air- and self- broadened CO2 and N2O spectroscopic line-shape parameters for HITRAN2020 database applications
Robab Hashemi, Harvard-Smithsonian Center for Astrophysics, robab.hashemi@cfa.harvard.edu (Presenter)
Iouli E. Gordon, Harvard-Smithsonian Center for Astrophysics, igordon@cfa.harvard.edu
Ha Tran, Laboratoire de Météorologie Dynamique, IPSL, CNRS, Sorbonne Université, ha.tran@lmd.jussieu.fr
Ekaterina V. Karlovets, Harvard-Smithsonian Center for Astrophysics, ekaterina.karlovets@cfa.harvard.edu
Roman V. Kochanov, Laboratory of Quantum Mechanics of Molecules and Radiative Processes, Tomsk State University, rkochanov85@gmail.com
Julien Lamouroux, Independent researcher, julien.g.lamouroux@gmail.com
Yan Tan, University of Science and Technology of China, Hefei, tanyan0921@hotmail.com
Ngoc Hoa Ngo, Faculty of Physics, Hanoi National University of Education, hoa.nn@hnue.edu.vn
Erin M. Adkins, National Institute of Standards and Technology, Gaithersburg, erin.adkins@nist.gov
Joseph T. Hodges, National Institute of Standards and Technology, Gaithersburg, joseph.hodges@nist.gov
David A. Long, National Institute of Standards and Technology, Gaithersburg, david.long@nist.gov
Manfred Birk, Remote Sensing Technology Institute, German Aerospace Center (DLR), manfred.birk@dlr.de
Chris D. Boone, Department of Chemistry, University of Waterloo, Ontario, cboone@scisat.ca
Adriana Predoi-Cross, Independent researcher, adriana.predoicross@gmail.com
Laurence S. Rothman, Harvard-Smithsonian Center for Astrophysics, lrothman@cfa.harvard.edu
Joep Loos, Remote Sensing Technology Institute, German Aerospace Center (DLR), joep.loos@web.de
Adam J. Fleisher, National Institute of Standards and Technology, Gaithersburg, adam.fleisher@nist.gov
This study features the recent revisions to the line-by-line parameters of carbon dioxide (CO2) [1] and nitrous oxide (N2O) [2]. These revisions were incorporated into the HITRAN2020 database [3]. Because of the prominent greenhouse potential of these two atmospheric components, we proposed updated sets of line half-widths and their temperature-dependence exponents for the air- and self-broadened CO2 and N2O lines using the Voigt and speed-dependent Voigt profiles for the enhancement and completeness of the HITRAN2020 database. The self- and air-broadened speed dependence parameters with their temperature dependences were added for these two molecules (for the majority of the transitions). A semi-empirical technique incorporating various reliable laboratory data was adopted to determine the line shifts of air- and self- broadened CO2 and N2O absorption lines [4,1,2]. This study also presents a systematic method of generating the first-order line-mixing parameters for N2O transitions using the exponential power gap scaling law [5]. For CO2, the first-order line-mixing parameters have been calculated using the updated program developed by Lamouroux et al. [6]. The effects of including full and first-order line-mixing parameters were examined for CO2 using this line-mixing package. In the 2.1-µm region, fit residuals (observed-calculated) at the desired level of 0.3 % accuracy were obtained at room temperature using the line-mixing package (either including the Voigt profile plus the full line-mixing effect or speed-dependent Voigt profile including the first-order line-mixing parameters [1]). Several laboratory and atmospheric transmission spectra were compared with the transmission spectra calculated with the new data using the HITRAN Application Programming Interface (HAPI) [7]. A notable improvement in the residuals was accomplished using the new set of parameters for the spectral regions examined in this work.
[1] Hashemi et al. 2020, JQSRT, volume 256, 2020, 107283.
[2] Hashemi et al. 2021, submitted to JQSRT, HITRAN20 Special Issue.
[3] Gordon et al. 2021, submitted to JQSRT, HITRAN20 Special Issue.
[4] Hartmann 2009, JQSRT 110 (18) (2009) 2019-2026.
[5] Gentry 1987, J. Chem. Phys. 86, 5722 (1987).
[6] Lamouroux et al. 2015, JQSRT 151 (2015) 88-96.
[7] Kochanov et al. 2016, JQSRT 177 (2016) 15-30.
Poster: Poster_Hashemi__18_25.pdf
Presentation Type: Poster
Session: 2.5a Retrieval algorithms and methods for inter-instrument and product Cal/Val
Session Date: Tuesday (6/15) 12:00 PM