Universität zu Köln

Takami, Kosuke, Nakagawa, Hiromu, Sagawa, Hideo, Krause, Pia, Murata, Isao, Kasaba, Yasumasa ORCID: 0000-0002-8160-3553, Kuroda, Takeshi ORCID: 0000-0003-4789-4737, Aoki, Shohei ORCID: 0000-0001-6727-125X, Kouyama, Toru, Kostiuk, Theodor, Livengood, Timothy A. and Gilli, Gabriella ORCID: 0000-0002-2253-5802 (2020). 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. Earth Planets Space, 72 (1). NEW YORK: SPRINGER. ISSN 1880-5981

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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 degrees 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 Haleakala, Hawaii.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Takami, Kosuke UNSPECIFIED UNSPECIFIED UNSPECIFIED Nakagawa, Hiromu UNSPECIFIED UNSPECIFIED UNSPECIFIED Sagawa, Hideo UNSPECIFIED UNSPECIFIED UNSPECIFIED Krause, Pia UNSPECIFIED UNSPECIFIED UNSPECIFIED Murata, Isao UNSPECIFIED UNSPECIFIED UNSPECIFIED Kasaba, Yasumasa UNSPECIFIED orcid.org/0000-0002-8160-3553 UNSPECIFIED Kuroda, Takeshi UNSPECIFIED orcid.org/0000-0003-4789-4737 UNSPECIFIED Aoki, Shohei UNSPECIFIED orcid.org/0000-0001-6727-125X UNSPECIFIED Kouyama, Toru UNSPECIFIED UNSPECIFIED UNSPECIFIED Kostiuk, Theodor UNSPECIFIED UNSPECIFIED UNSPECIFIED Livengood, Timothy A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gilli, Gabriella UNSPECIFIED orcid.org/0000-0002-2253-5802 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-334237
DOI:	10.1186/s40623-020-01188-0
Journal or Publication Title:	Earth Planets Space
Volume:	72
Number:	1
Date:	2020
Publisher:	SPRINGER
Place of Publication:	NEW YORK
ISSN:	1880-5981
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language 2001-2009 INFERIOR CONJUNCTION; UPPER-ATMOSPHERE; THERMAL STRUCTURE; GENERAL-CIRCULATION; LOWER THERMOSPHERE; VIRTIS Multiple languages Geosciences, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/33423