@article{f4f6a3775e3048b481d60a52666e2645,
title = "Evaluation of a method to retrieve temperature and wind velocity profiles of the Venusian nightside mesosphere from mid-infrared CO2 absorption line observed by heterodyne spectroscopy",
abstract = "We evaluated a method for retrieving vertical temperature and Doppler wind velocity profiles of the Venusian nightside mesosphere from the CO2 absorption line resolved by mid-infrared heterodyne spectroscopy. The achievable sensitive altitude and retrieval accuracy were derived with multiple model spectra generated from various temperature and wind velocity profiles with several noise levels. The temperature profiles were retrieved at altitudes of 70–100 km with a vertical resolution of 5 km and a retrieval accuracy of ± 15 K. The wind velocity was also retrieved at an altitude of approximately 85 km with a vertical resolution of 10 km and a retrieval accuracy of ± 25–50 m/s. In addition, we studied an event and applied our method to spectra obtained by the HIPWAC instrument attached to the NASA/IRTF 3-m telescope on May 19–22, 2012. Retrieved wind velocities in a latitude of 33° S at 3:00 LT were interpreted as subsolar-to-antisolar (SS-AS) flows at altitudes of 84 ± 6 km and 94 ± 7 km, and they were stronger than expected. This result suggested that the transition between the retrograde superrotational zonal (RSZ) wind and SS-AS flow may occur at altitudes below 90 km which previously was predicted to be the transition region. This work provides a basis for our analysis of further observations obtained by a mid-infrared heterodyne spectrometer MILAHI attached to the Tohoku University 60-cm telescope at Haleakalā, Hawaii.[Figure not available: see fulltext.].",
keywords = "CO absorption line, Mesosphere, Mid-infrared heterodyne spectroscopy, Temperature, Venus, Wind velocity",
author = "Kosuke Takami and Hiromu Nakagawa and Hideo Sagawa and Pia Krause and Isao Murata and Yasumasa Kasaba and Takeshi Kuroda and Shohei Aoki and Toru Kouyama and Theodor Kostiuk and Livengood, {Timothy A.} and Gabriella Gilli",
note = "Funding Information: This work was carried out by the international joint research program of the Institute for Space‐Earth Environmental Research, Nagoya University, and the Payload Basic Development Program of Institute of Space and Astronautical Science, Japan Aerospace and Exploration Agency. GG work was supported by Funda{\c c}{\~a}o para a Ci{\^e}ncia e a Tecnologia (FCT) through the research grants UIDB/04434/2020, UIDP/04434/2020, P-TUGA PTDC/FIS-AST/29942/2017, and by the European Union′s Horizon2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 796923. Funding Information: This work was supported by the Japan Society for the Promotion of Science (JSPS) Grants‐in‐Aid for Scientific Research (16H02231, 19H00707). Acknowledgements Funding Information: This work was carried out by the international joint research program of the Institute for Space?Earth Environmental Research, Nagoya University, and the Payload Basic Development Program of Institute of Space and Astronautical Science, Japan Aerospace and Exploration Agency.?GG work was supported by Funda??o para a Ci?ncia e a Tecnologia (FCT) through the research grants UIDB/04434/2020, UIDP/04434/2020, P-TUGA PTDC/FIS-AST/29942/2017, and by the European Union?s Horizon2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 796923. Publisher Copyright: {\textcopyright} 2020, The Author(s).",
year = "2020",
month = dec,
day = "1",
doi = "10.1186/s40623-020-01188-0",
language = "English",
volume = "72",
journal = "Earth, Planets and Space",
issn = "1343-8832",
publisher = "Terra Scientific Publishing Company",
number = "1",
}