Seasonal Changes in Titan's Southern Stratosphere
In August 2009 Titan passed through northern spring equinox, and the southern hemisphere passed into fall. Since then, the moon's atmosphere has been closely watched for evidence of the expected seasonal reversal of stratospheric circulation, with increased northern insolation leading to upwell...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20120016034 2023-05-15T18:22:43+02:00 Seasonal Changes in Titan's Southern Stratosphere Coustenis, A. Bjoraker, G. L. Nixon, C. A. Achterberg, R. K. Flasar, F. M. Cottini, V. Jennings, D. E. Teanby, N. A. Irwin, P. G. Unclassified, Unlimited, Publicly available October 14, 2012 application/pdf http://hdl.handle.net/2060/20120016034 unknown Document ID: 20120016034 http://hdl.handle.net/2060/20120016034 Copyright, Distribution as joint owner in the copyright CASI Lunar and Planetary Science and Exploration GSFC.ABS.7310.2012 44th annual meeting of the Division for Planetary Sciences of the American Astronomical Society; 14-19 Oct. 2012; Reno, NV; United States 2012 ftnasantrs 2019-07-21T00:44:30Z In August 2009 Titan passed through northern spring equinox, and the southern hemisphere passed into fall. Since then, the moon's atmosphere has been closely watched for evidence of the expected seasonal reversal of stratospheric circulation, with increased northern insolation leading to upwelling, and consequent downwelling at southern high latitudes. If the southern winter mirrors the northern winter, this circulation will be traced by increases in short-lived gas species advected downwards from the upper atmosphere to the stratosphere. The Cassini spacecraft in orbit around Saturn carries on board the Composite Infrared Spectrometer (CIRS), which has been actively monitoring the trace gas populations through measurement of the intensity of their infrared emission bands (7-1000 micron). In this presentation we will show fresh evidence from recent CIRS measurements in June 2012, that the shortest-lived and least abundant minor species (C3H4, C4H2, C6H6, HC3N) are indeed increasing dramatically southwards of 50S in the lower stratosphere. Intriguingly, the more stable gases (C2H2, HCN, CO2) have yet to show this trend, and continue to exhibit their 'summer' abundances, decreasing towards the south pole. Possible chemical and dynamical explanations of these results will be discussed , along with the potential of future CIRS measurements to monitor and elucidate these seasonal changes. Other/Unknown Material South pole NASA Technical Reports Server (NTRS) South Pole |
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NASA Technical Reports Server (NTRS) |
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ftnasantrs |
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topic |
Lunar and Planetary Science and Exploration |
spellingShingle |
Lunar and Planetary Science and Exploration Coustenis, A. Bjoraker, G. L. Nixon, C. A. Achterberg, R. K. Flasar, F. M. Cottini, V. Jennings, D. E. Teanby, N. A. Irwin, P. G. Seasonal Changes in Titan's Southern Stratosphere |
topic_facet |
Lunar and Planetary Science and Exploration |
description |
In August 2009 Titan passed through northern spring equinox, and the southern hemisphere passed into fall. Since then, the moon's atmosphere has been closely watched for evidence of the expected seasonal reversal of stratospheric circulation, with increased northern insolation leading to upwelling, and consequent downwelling at southern high latitudes. If the southern winter mirrors the northern winter, this circulation will be traced by increases in short-lived gas species advected downwards from the upper atmosphere to the stratosphere. The Cassini spacecraft in orbit around Saturn carries on board the Composite Infrared Spectrometer (CIRS), which has been actively monitoring the trace gas populations through measurement of the intensity of their infrared emission bands (7-1000 micron). In this presentation we will show fresh evidence from recent CIRS measurements in June 2012, that the shortest-lived and least abundant minor species (C3H4, C4H2, C6H6, HC3N) are indeed increasing dramatically southwards of 50S in the lower stratosphere. Intriguingly, the more stable gases (C2H2, HCN, CO2) have yet to show this trend, and continue to exhibit their 'summer' abundances, decreasing towards the south pole. Possible chemical and dynamical explanations of these results will be discussed , along with the potential of future CIRS measurements to monitor and elucidate these seasonal changes. |
format |
Other/Unknown Material |
author |
Coustenis, A. Bjoraker, G. L. Nixon, C. A. Achterberg, R. K. Flasar, F. M. Cottini, V. Jennings, D. E. Teanby, N. A. Irwin, P. G. |
author_facet |
Coustenis, A. Bjoraker, G. L. Nixon, C. A. Achterberg, R. K. Flasar, F. M. Cottini, V. Jennings, D. E. Teanby, N. A. Irwin, P. G. |
author_sort |
Coustenis, A. |
title |
Seasonal Changes in Titan's Southern Stratosphere |
title_short |
Seasonal Changes in Titan's Southern Stratosphere |
title_full |
Seasonal Changes in Titan's Southern Stratosphere |
title_fullStr |
Seasonal Changes in Titan's Southern Stratosphere |
title_full_unstemmed |
Seasonal Changes in Titan's Southern Stratosphere |
title_sort |
seasonal changes in titan's southern stratosphere |
publishDate |
2012 |
url |
http://hdl.handle.net/2060/20120016034 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_source |
CASI |
op_relation |
Document ID: 20120016034 http://hdl.handle.net/2060/20120016034 |
op_rights |
Copyright, Distribution as joint owner in the copyright |
_version_ |
1766202133697265664 |