Seasonal changes in the middle atmosphere of Titan from Cassini/CIRS observations: Temperature and trace species abundance profiles from 2004 to 2017
International audience The Cassini/Composite InfraRed Spectrometer (CIRS) instrument has been observing the middle atmosphere of Titan over almost half a Saturnian year. We used the CIRS dataset processed through the up-to-date calibration pipeline to characterize seasonal changes of temperature and...
Published in: | Icarus |
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Main Authors: | , , , , , , , , |
Other Authors: | , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2020
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Online Access: | https://hal.science/hal-02399854 https://doi.org/10.1016/j.icarus.2019.113547 |
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[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] |
spellingShingle |
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] Mathé, Christophe Vinatier, Sandrine Bézard, Bruno Lebonnois, Sébastien Gorius, Nicolas Jennings, Donald Mamoutkine, Andrei Guandique, Ever Vatant D’ollone, Jan Seasonal changes in the middle atmosphere of Titan from Cassini/CIRS observations: Temperature and trace species abundance profiles from 2004 to 2017 |
topic_facet |
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] |
description |
International audience The Cassini/Composite InfraRed Spectrometer (CIRS) instrument has been observing the middle atmosphere of Titan over almost half a Saturnian year. We used the CIRS dataset processed through the up-to-date calibration pipeline to characterize seasonal changes of temperature and abundance profiles in the middle atmosphere of Titan, from mid-northern winter to early northern summer all around the satellite. We used limb spectra from 590 to 1500 cm−1 at 0.5-cm−1 spectral resolution, which allows us to probe different altitudes. We averaged the limb spectra recorded during each flyby on a fixed altitude grid to increase the signal-to-noise ratio. These thermal infrared data were analyzed by means of a radiative transfer code coupled with an inversion algorithm, in order to retrieve vertical temperature and abundance profiles. These profiles cover an altitude range of approximately 100 to 600 km, at 10- or 40-km vertical resolution (depending on the observation). Strong changes in temperature and composition occur in both polar regions where a vortex is in place during the winter. At this season, we observe a global enrichment in photochemical compounds in the mesosphere and stratosphere and a hot stratopause located around 0.01 mbar, both linked to downwelling in a pole-to-pole circulation cell. After the northern spring equinox, between December 2009 and April 2010, a stronger enhancement of photochemical compounds occurred at the north pole above the 0.01-mbar region, likely due to combined photochemical and dynamical effects. During the southern autumn in 2015, above the South pole, we also observed a strong enrichment in photochemical compounds that contributed to the cooling of the stratosphere above 0.2 mbar (∼300 km). Close to the northern spring equinox, in December 2009, the thermal profile at 74°N exhibits an oscillation that we interpret in terms of an inertia-gravity wave. |
author2 |
PLANETO - LATMOS Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) NASA Goddard Space Flight Center (GSFC) Department of Astronomy College Park University of Maryland College Park University of Maryland System-University of Maryland System ADNET Systems, Inc. ANR-10-LABX-0047,ESEP,Space explorations of Planetary Environments(2010) |
format |
Article in Journal/Newspaper |
author |
Mathé, Christophe Vinatier, Sandrine Bézard, Bruno Lebonnois, Sébastien Gorius, Nicolas Jennings, Donald Mamoutkine, Andrei Guandique, Ever Vatant D’ollone, Jan |
author_facet |
Mathé, Christophe Vinatier, Sandrine Bézard, Bruno Lebonnois, Sébastien Gorius, Nicolas Jennings, Donald Mamoutkine, Andrei Guandique, Ever Vatant D’ollone, Jan |
author_sort |
Mathé, Christophe |
title |
Seasonal changes in the middle atmosphere of Titan from Cassini/CIRS observations: Temperature and trace species abundance profiles from 2004 to 2017 |
title_short |
Seasonal changes in the middle atmosphere of Titan from Cassini/CIRS observations: Temperature and trace species abundance profiles from 2004 to 2017 |
title_full |
Seasonal changes in the middle atmosphere of Titan from Cassini/CIRS observations: Temperature and trace species abundance profiles from 2004 to 2017 |
title_fullStr |
Seasonal changes in the middle atmosphere of Titan from Cassini/CIRS observations: Temperature and trace species abundance profiles from 2004 to 2017 |
title_full_unstemmed |
Seasonal changes in the middle atmosphere of Titan from Cassini/CIRS observations: Temperature and trace species abundance profiles from 2004 to 2017 |
title_sort |
seasonal changes in the middle atmosphere of titan from cassini/cirs observations: temperature and trace species abundance profiles from 2004 to 2017 |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-02399854 https://doi.org/10.1016/j.icarus.2019.113547 |
geographic |
South Pole North Pole |
geographic_facet |
South Pole North Pole |
genre |
South pole |
genre_facet |
South pole |
op_source |
ISSN: 0019-1035 EISSN: 1090-2643 Icarus https://hal.science/hal-02399854 Icarus, 2020, 344, pp.113547. ⟨10.1016/j.icarus.2019.113547⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/arxiv/1910.12677 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.icarus.2019.113547 hal-02399854 https://hal.science/hal-02399854 ARXIV: 1910.12677 BIBCODE: 2020Icar.34413547M doi:10.1016/j.icarus.2019.113547 |
op_doi |
https://doi.org/10.1016/j.icarus.2019.113547 |
container_title |
Icarus |
container_volume |
344 |
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113547 |
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ftanrparis:oai:HAL:hal-02399854v1 2024-06-16T07:43:15+00:00 Seasonal changes in the middle atmosphere of Titan from Cassini/CIRS observations: Temperature and trace species abundance profiles from 2004 to 2017 Mathé, Christophe Vinatier, Sandrine Bézard, Bruno Lebonnois, Sébastien Gorius, Nicolas Jennings, Donald Mamoutkine, Andrei Guandique, Ever Vatant D’ollone, Jan PLANETO - LATMOS Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) NASA Goddard Space Flight Center (GSFC) Department of Astronomy College Park University of Maryland College Park University of Maryland System-University of Maryland System ADNET Systems, Inc. ANR-10-LABX-0047,ESEP,Space explorations of Planetary Environments(2010) 2020-07 https://hal.science/hal-02399854 https://doi.org/10.1016/j.icarus.2019.113547 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/arxiv/1910.12677 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.icarus.2019.113547 hal-02399854 https://hal.science/hal-02399854 ARXIV: 1910.12677 BIBCODE: 2020Icar.34413547M doi:10.1016/j.icarus.2019.113547 ISSN: 0019-1035 EISSN: 1090-2643 Icarus https://hal.science/hal-02399854 Icarus, 2020, 344, pp.113547. ⟨10.1016/j.icarus.2019.113547⟩ [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] info:eu-repo/semantics/article Journal articles 2020 ftanrparis https://doi.org/10.1016/j.icarus.2019.113547 2024-05-23T00:03:15Z International audience The Cassini/Composite InfraRed Spectrometer (CIRS) instrument has been observing the middle atmosphere of Titan over almost half a Saturnian year. We used the CIRS dataset processed through the up-to-date calibration pipeline to characterize seasonal changes of temperature and abundance profiles in the middle atmosphere of Titan, from mid-northern winter to early northern summer all around the satellite. We used limb spectra from 590 to 1500 cm−1 at 0.5-cm−1 spectral resolution, which allows us to probe different altitudes. We averaged the limb spectra recorded during each flyby on a fixed altitude grid to increase the signal-to-noise ratio. These thermal infrared data were analyzed by means of a radiative transfer code coupled with an inversion algorithm, in order to retrieve vertical temperature and abundance profiles. These profiles cover an altitude range of approximately 100 to 600 km, at 10- or 40-km vertical resolution (depending on the observation). Strong changes in temperature and composition occur in both polar regions where a vortex is in place during the winter. At this season, we observe a global enrichment in photochemical compounds in the mesosphere and stratosphere and a hot stratopause located around 0.01 mbar, both linked to downwelling in a pole-to-pole circulation cell. After the northern spring equinox, between December 2009 and April 2010, a stronger enhancement of photochemical compounds occurred at the north pole above the 0.01-mbar region, likely due to combined photochemical and dynamical effects. During the southern autumn in 2015, above the South pole, we also observed a strong enrichment in photochemical compounds that contributed to the cooling of the stratosphere above 0.2 mbar (∼300 km). Close to the northern spring equinox, in December 2009, the thermal profile at 74°N exhibits an oscillation that we interpret in terms of an inertia-gravity wave. Article in Journal/Newspaper South pole Portail HAL-ANR (Agence Nationale de la Recherche) South Pole North Pole Icarus 344 113547 |