Universität zu Köln

Noguchi, K., Morii, Y., Oda, N., Kuroda, T., Tellmann, S. and Paetzold, M. (2017). Role of stationary and transient waves in CO2 supersaturation during northern winter in the Martian atmosphere revealed by MGS radio occultation measurements. J. Geophys. Res.-Planets, 122 (5). S. 912 - 927. WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 2169-9100

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Abstract

The Martian atmosphere, which mainly consists of carbon dioxide (CO2), is characterized by extremely low temperatures that cause CO2 gas to freeze and dry ice to form. To date, temperatures below the CO2 saturation temperature, which can be attributed to the effects of atmospheric waves, have been observed in the polar winter and in the mesosphere. Using data from Mars Global Surveyor (MGS) radio occultation measurements, we investigated the role of large-scale atmospheric waves including stationary and transient waves at northern high latitudes in winter on CO2 supersaturation. A distinct longitudinal dependence of CO2 supersaturation was observed at altitudes higher than the pressure level of 200-400Pa, where a stationary wave with a wave number of 2, whose temperature amplitude had minima at 30-100Pa, lowered the background temperature to a level close to the CO2 saturation temperature. However, the stationary wave alone was not sufficient to cause CO2 supersaturation. Additional temperature disturbances caused by transient waves, namely, superposition of both waves, had a significant role in CO2 supersaturation. The longitudinal dependence of the occurrence of CO2 supersaturation revealed by our study might affect the longitudinal distribution of CO2 snowfall and the formation of the seasonal polar ice cap.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Noguchi, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Morii, Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED Oda, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kuroda, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tellmann, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Paetzold, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-231721
DOI:	10.1002/2016JE005142
Journal or Publication Title:	J. Geophys. Res.-Planets
Volume:	122
Number:	5
Page Range:	S. 912 - 927
Date:	2017
Publisher:	AMER GEOPHYSICAL UNION
Place of Publication:	WASHINGTON
ISSN:	2169-9100
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MARS GLOBAL SURVEYOR; BAROCLINIC WAVES; HEMISPHERE; CONDENSATION; METEOROLOGY; SIMULATION; CLIMATE; EDDIES; CLOUDS; SNOW Multiple languages Geochemistry & Geophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/23172