Temperature and chemical species distributions in the middle atmosphere observed during Titan’s late northern spring to early summer
International audience We present a study of the seasonal evolution of Titan’s thermal field and distributions of haze, C2H2, C2H4, C2H6, CH3C2H, C3H8, C4H2, C6H6, HCN, and HC3N from March 2015 (Ls = 66°) to September 2017 (Ls = 93°) (i.e., from the last third of northern spring to early summer). We...
Published in: | Astronomy & Astrophysics |
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Main Authors: | , , , , , , , , , , , , , , |
Other Authors: | , , , , , , , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2020
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Online Access: | https://hal.science/hal-02942469 https://hal.science/hal-02942469/document https://hal.science/hal-02942469/file/aa38411-20.pdf https://doi.org/10.1051/0004-6361/202038411 |
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Open Polar |
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Archives ouvertes de Paris-Saclay |
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ftuniparissaclay |
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English |
topic |
infrared radiative transfer data analysis atmospheres Titan [SDU]Sciences of the Universe [physics] |
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infrared radiative transfer data analysis atmospheres Titan [SDU]Sciences of the Universe [physics] Vinatier, S. Mathé, Christophe Bézard, B. Vatant D’ollone, J. Lebonnois, S. Dauphin, C. Flasar, F. M. Achterberg, R. K. Seignovert, B. Sylvestre, M. Teanby, N. A. Gorius, N. Mamoutkine, A. Guandique, E. Jennings, D. E. Temperature and chemical species distributions in the middle atmosphere observed during Titan’s late northern spring to early summer |
topic_facet |
infrared radiative transfer data analysis atmospheres Titan [SDU]Sciences of the Universe [physics] |
description |
International audience We present a study of the seasonal evolution of Titan’s thermal field and distributions of haze, C2H2, C2H4, C2H6, CH3C2H, C3H8, C4H2, C6H6, HCN, and HC3N from March 2015 (Ls = 66°) to September 2017 (Ls = 93°) (i.e., from the last third of northern spring to early summer). We analyzed thermal emission of Titan’s atmosphere acquired by the Cassini Composite Infrared Spectrometer with limb and nadir geometry to retrieve the stratospheric and mesospheric temperature and mixing ratios pole-to-pole meridional cross sections from 5 mbar to 50 μbar (120–650 km). The southern stratopause varied in a complex way and showed a global temperature increase from 2015 to 2017 at high-southern latitudes. Stratospheric southern polar temperatures, which were observed to be as low as 120 K in early 2015 due to the polar night, showed a 30 K increase (at 0.5 mbar) from March 2015 to May 2017 due to adiabatic heating in the subsiding branch of the global overturning circulation. All photochemical compounds were enriched at the south pole by this subsidence. Polar cross sections of these enhanced species, which are good tracers of the global dynamics, highlighted changes in the structure of the southern polar vortex. These high enhancements combined with the unusually low temperatures (<120 K) of the deep stratosphere resulted in condensation at the south pole between 0.1 and 0.03 mbar (240–280 km) of HCN, HC3N, C6H6 and possibly C4H2 in March 2015 (Ls = 66°). These molecules were observed to condense deeper with increasing distance from the south pole. At high-northern latitudes, stratospheric enrichments remaining from the winter were observed below 300 km between 2015 and May 2017 (Ls = 90°) for all chemical compounds and up to September 2017 (Ls = 93°) for C2H2, C2H4, CH3C2H, C3H8, and C4H2. In September 2017, these local enhancements were less pronounced than earlier for C2H2, C4H2, CH3C2H, HC3N, and HCN, and were no longer observed for C2H6 and C6 H6, which suggests a change in the northern polar ... |
author2 |
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) 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 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) School of Physics and Astronomy Leicester University of Leicester Institut Villebon – Georges Charpak Université Paris-Saclay NASA Goddard Space Flight Center (GSFC) Jet Propulsion Laboratory (JPL) NASA-California Institute of Technology (CALTECH) School of Earth Sciences Bristol University of Bristol Bristol Department of Astronomy College Park University of Maryland College Park University of Maryland System-University of Maryland System ADNET Systems, Inc. |
format |
Article in Journal/Newspaper |
author |
Vinatier, S. Mathé, Christophe Bézard, B. Vatant D’ollone, J. Lebonnois, S. Dauphin, C. Flasar, F. M. Achterberg, R. K. Seignovert, B. Sylvestre, M. Teanby, N. A. Gorius, N. Mamoutkine, A. Guandique, E. Jennings, D. E. |
author_facet |
Vinatier, S. Mathé, Christophe Bézard, B. Vatant D’ollone, J. Lebonnois, S. Dauphin, C. Flasar, F. M. Achterberg, R. K. Seignovert, B. Sylvestre, M. Teanby, N. A. Gorius, N. Mamoutkine, A. Guandique, E. Jennings, D. E. |
author_sort |
Vinatier, S. |
title |
Temperature and chemical species distributions in the middle atmosphere observed during Titan’s late northern spring to early summer |
title_short |
Temperature and chemical species distributions in the middle atmosphere observed during Titan’s late northern spring to early summer |
title_full |
Temperature and chemical species distributions in the middle atmosphere observed during Titan’s late northern spring to early summer |
title_fullStr |
Temperature and chemical species distributions in the middle atmosphere observed during Titan’s late northern spring to early summer |
title_full_unstemmed |
Temperature and chemical species distributions in the middle atmosphere observed during Titan’s late northern spring to early summer |
title_sort |
temperature and chemical species distributions in the middle atmosphere observed during titan’s late northern spring to early summer |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-02942469 https://hal.science/hal-02942469/document https://hal.science/hal-02942469/file/aa38411-20.pdf https://doi.org/10.1051/0004-6361/202038411 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
polar night South pole |
genre_facet |
polar night South pole |
op_source |
ISSN: 0004-6361 EISSN: 1432-0756 Astronomy and Astrophysics - A&A https://hal.science/hal-02942469 Astronomy and Astrophysics - A&A, 2020, 641, A116 (33p.). ⟨10.1051/0004-6361/202038411⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/202038411 hal-02942469 https://hal.science/hal-02942469 https://hal.science/hal-02942469/document https://hal.science/hal-02942469/file/aa38411-20.pdf doi:10.1051/0004-6361/202038411 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1051/0004-6361/202038411 |
container_title |
Astronomy & Astrophysics |
container_volume |
641 |
container_start_page |
A116 |
_version_ |
1802010374623461376 |
spelling |
ftuniparissaclay:oai:HAL:hal-02942469v1 2024-06-16T07:42:48+00:00 Temperature and chemical species distributions in the middle atmosphere observed during Titan’s late northern spring to early summer Vinatier, S. Mathé, Christophe Bézard, B. Vatant D’ollone, J. Lebonnois, S. Dauphin, C. Flasar, F. M. Achterberg, R. K. Seignovert, B. Sylvestre, M. Teanby, N. A. Gorius, N. Mamoutkine, A. Guandique, E. Jennings, D. E. 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) 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 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) School of Physics and Astronomy Leicester University of Leicester Institut Villebon – Georges Charpak Université Paris-Saclay NASA Goddard Space Flight Center (GSFC) Jet Propulsion Laboratory (JPL) NASA-California Institute of Technology (CALTECH) School of Earth Sciences Bristol University of Bristol Bristol Department of Astronomy College Park University of Maryland College Park University of Maryland System-University of Maryland System ADNET Systems, Inc. 2020 https://hal.science/hal-02942469 https://hal.science/hal-02942469/document https://hal.science/hal-02942469/file/aa38411-20.pdf https://doi.org/10.1051/0004-6361/202038411 en eng HAL CCSD EDP Sciences info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/202038411 hal-02942469 https://hal.science/hal-02942469 https://hal.science/hal-02942469/document https://hal.science/hal-02942469/file/aa38411-20.pdf doi:10.1051/0004-6361/202038411 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0004-6361 EISSN: 1432-0756 Astronomy and Astrophysics - A&A https://hal.science/hal-02942469 Astronomy and Astrophysics - A&A, 2020, 641, A116 (33p.). ⟨10.1051/0004-6361/202038411⟩ infrared radiative transfer data analysis atmospheres Titan [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2020 ftuniparissaclay https://doi.org/10.1051/0004-6361/202038411 2024-05-17T00:07:06Z International audience We present a study of the seasonal evolution of Titan’s thermal field and distributions of haze, C2H2, C2H4, C2H6, CH3C2H, C3H8, C4H2, C6H6, HCN, and HC3N from March 2015 (Ls = 66°) to September 2017 (Ls = 93°) (i.e., from the last third of northern spring to early summer). We analyzed thermal emission of Titan’s atmosphere acquired by the Cassini Composite Infrared Spectrometer with limb and nadir geometry to retrieve the stratospheric and mesospheric temperature and mixing ratios pole-to-pole meridional cross sections from 5 mbar to 50 μbar (120–650 km). The southern stratopause varied in a complex way and showed a global temperature increase from 2015 to 2017 at high-southern latitudes. Stratospheric southern polar temperatures, which were observed to be as low as 120 K in early 2015 due to the polar night, showed a 30 K increase (at 0.5 mbar) from March 2015 to May 2017 due to adiabatic heating in the subsiding branch of the global overturning circulation. All photochemical compounds were enriched at the south pole by this subsidence. Polar cross sections of these enhanced species, which are good tracers of the global dynamics, highlighted changes in the structure of the southern polar vortex. These high enhancements combined with the unusually low temperatures (<120 K) of the deep stratosphere resulted in condensation at the south pole between 0.1 and 0.03 mbar (240–280 km) of HCN, HC3N, C6H6 and possibly C4H2 in March 2015 (Ls = 66°). These molecules were observed to condense deeper with increasing distance from the south pole. At high-northern latitudes, stratospheric enrichments remaining from the winter were observed below 300 km between 2015 and May 2017 (Ls = 90°) for all chemical compounds and up to September 2017 (Ls = 93°) for C2H2, C2H4, CH3C2H, C3H8, and C4H2. In September 2017, these local enhancements were less pronounced than earlier for C2H2, C4H2, CH3C2H, HC3N, and HCN, and were no longer observed for C2H6 and C6 H6, which suggests a change in the northern polar ... Article in Journal/Newspaper polar night South pole Archives ouvertes de Paris-Saclay South Pole Astronomy & Astrophysics 641 A116 |