Analysis of Cassini/CIRS limb spectra of Titan acquired during the nominal mission. I. Hydrocarbons, nitriles and CO2 vertical mixing ratio profiles
International audience Observations of the Composite InfraRed Spectrometer (CIRS) during the entire nominal Cassini mission (2004-2008) provide us with an accurate global view of composition and temperature in the middle atmosphere of Titan (between 100 and 500 km). We investigated limb spectra acqu...
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Main Authors: | , , , , , , , , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://hal.archives-ouvertes.fr/hal-01136719 https://doi.org/10.1016/j.icarus.2009.08.013 |
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[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology Vinatier, Sandrine Bézard, B. Nixon, C.A. Mamoutkine, A. Carlson, R.C. Jennings, D.E. Guandique, E.A. Teanby, N.A. Bjoraker, G.L. Michael Flasar, F. Kunde, V.G. Analysis of Cassini/CIRS limb spectra of Titan acquired during the nominal mission. I. Hydrocarbons, nitriles and CO2 vertical mixing ratio profiles |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology |
description |
International audience Observations of the Composite InfraRed Spectrometer (CIRS) during the entire nominal Cassini mission (2004-2008) provide us with an accurate global view of composition and temperature in the middle atmosphere of Titan (between 100 and 500 km). We investigated limb spectra acquired at 0.5 cm- 1 resolution at nine different latitudes between 56°S and 80°N, with a better sampling in the northern hemisphere where molecular abundances and temperature present strong latitudinal variations. From this limb data acquired between February 2005 and May 2008, we retrieved the vertical mixing ratio profiles of C2H2, C2H4, C2H6, C3H8, CH3C2H, C4H2, C6H6, HCN, HC3N and CO2. We present here for the first time, the latitudinal variations of the C2H6, C3H8, CO2, C2H4 and C6H6 vertical mixing ratios profiles. Some molecules, such as C2H6 or C3H8 present little variations above their condensation level. The other molecules (except CO2) show a significant enhancement of their mixing ratios poleward of 50°N. C2H4 is the only molecule whose mixing ratio decreases with height at latitudes below 46°N. Regions depleted in C2H2, HCN and C4H2 are observed around 400 km (0.01 mbar) and 55°N. We also inferred a region enriched in CO2 located between 30 and 40°N in the 2-0.7 mbar pressure range. At 80°N, almost all molecules studied here present a local minimum of their mixing ratio profiles near 300 km (~0.07 mbar), which is in contradiction with Global Circulation Models that predict constant-with-height vertical profiles due to subsidence at the north pole. © 2009 Elsevier Inc. All rights reserved. |
author2 |
Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École des Ponts ParisTech (ENPC)-École polytechnique (X)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC) Department of Astronomy College Park University of Maryland College Park University of Maryland System-University of Maryland System NASA Goddard Space Flight Center (GSFC) ADNET Systems, Inc. Catholic University of America Department of Atmospheric, Oceanic and Planetary Physics Oxford (AOPP) University of Oxford Oxford |
format |
Article in Journal/Newspaper |
author |
Vinatier, Sandrine Bézard, B. Nixon, C.A. Mamoutkine, A. Carlson, R.C. Jennings, D.E. Guandique, E.A. Teanby, N.A. Bjoraker, G.L. Michael Flasar, F. Kunde, V.G. |
author_facet |
Vinatier, Sandrine Bézard, B. Nixon, C.A. Mamoutkine, A. Carlson, R.C. Jennings, D.E. Guandique, E.A. Teanby, N.A. Bjoraker, G.L. Michael Flasar, F. Kunde, V.G. |
author_sort |
Vinatier, Sandrine |
title |
Analysis of Cassini/CIRS limb spectra of Titan acquired during the nominal mission. I. Hydrocarbons, nitriles and CO2 vertical mixing ratio profiles |
title_short |
Analysis of Cassini/CIRS limb spectra of Titan acquired during the nominal mission. I. Hydrocarbons, nitriles and CO2 vertical mixing ratio profiles |
title_full |
Analysis of Cassini/CIRS limb spectra of Titan acquired during the nominal mission. I. Hydrocarbons, nitriles and CO2 vertical mixing ratio profiles |
title_fullStr |
Analysis of Cassini/CIRS limb spectra of Titan acquired during the nominal mission. I. Hydrocarbons, nitriles and CO2 vertical mixing ratio profiles |
title_full_unstemmed |
Analysis of Cassini/CIRS limb spectra of Titan acquired during the nominal mission. I. Hydrocarbons, nitriles and CO2 vertical mixing ratio profiles |
title_sort |
analysis of cassini/cirs limb spectra of titan acquired during the nominal mission. i. hydrocarbons, nitriles and co2 vertical mixing ratio profiles |
publisher |
HAL CCSD |
publishDate |
2010 |
url |
https://hal.archives-ouvertes.fr/hal-01136719 https://doi.org/10.1016/j.icarus.2009.08.013 |
geographic |
North Pole |
geographic_facet |
North Pole |
genre |
North Pole |
genre_facet |
North Pole |
op_source |
ISSN: 0019-1035 EISSN: 1090-2643 Icarus https://hal.archives-ouvertes.fr/hal-01136719 Icarus, Elsevier, 2010, 205 (2), pp.559-570. ⟨10.1016/j.icarus.2009.08.013⟩ |
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https://doi.org/10.1016/j.icarus.2009.08.013 |
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Icarus |
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ftccsdartic:oai:HAL:hal-01136719v1 2023-05-15T17:39:59+02:00 Analysis of Cassini/CIRS limb spectra of Titan acquired during the nominal mission. I. Hydrocarbons, nitriles and CO2 vertical mixing ratio profiles Vinatier, Sandrine Bézard, B. Nixon, C.A. Mamoutkine, A. Carlson, R.C. Jennings, D.E. Guandique, E.A. Teanby, N.A. Bjoraker, G.L. Michael Flasar, F. Kunde, V.G. Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École des Ponts ParisTech (ENPC)-École polytechnique (X)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC) Department of Astronomy College Park University of Maryland College Park University of Maryland System-University of Maryland System NASA Goddard Space Flight Center (GSFC) ADNET Systems, Inc. Catholic University of America Department of Atmospheric, Oceanic and Planetary Physics Oxford (AOPP) University of Oxford Oxford 2010 https://hal.archives-ouvertes.fr/hal-01136719 https://doi.org/10.1016/j.icarus.2009.08.013 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.icarus.2009.08.013 hal-01136719 https://hal.archives-ouvertes.fr/hal-01136719 doi:10.1016/j.icarus.2009.08.013 ISSN: 0019-1035 EISSN: 1090-2643 Icarus https://hal.archives-ouvertes.fr/hal-01136719 Icarus, Elsevier, 2010, 205 (2), pp.559-570. ⟨10.1016/j.icarus.2009.08.013⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology info:eu-repo/semantics/article Journal articles 2010 ftccsdartic https://doi.org/10.1016/j.icarus.2009.08.013 2021-11-28T01:16:22Z International audience Observations of the Composite InfraRed Spectrometer (CIRS) during the entire nominal Cassini mission (2004-2008) provide us with an accurate global view of composition and temperature in the middle atmosphere of Titan (between 100 and 500 km). We investigated limb spectra acquired at 0.5 cm- 1 resolution at nine different latitudes between 56°S and 80°N, with a better sampling in the northern hemisphere where molecular abundances and temperature present strong latitudinal variations. From this limb data acquired between February 2005 and May 2008, we retrieved the vertical mixing ratio profiles of C2H2, C2H4, C2H6, C3H8, CH3C2H, C4H2, C6H6, HCN, HC3N and CO2. We present here for the first time, the latitudinal variations of the C2H6, C3H8, CO2, C2H4 and C6H6 vertical mixing ratios profiles. Some molecules, such as C2H6 or C3H8 present little variations above their condensation level. The other molecules (except CO2) show a significant enhancement of their mixing ratios poleward of 50°N. C2H4 is the only molecule whose mixing ratio decreases with height at latitudes below 46°N. Regions depleted in C2H2, HCN and C4H2 are observed around 400 km (0.01 mbar) and 55°N. We also inferred a region enriched in CO2 located between 30 and 40°N in the 2-0.7 mbar pressure range. At 80°N, almost all molecules studied here present a local minimum of their mixing ratio profiles near 300 km (~0.07 mbar), which is in contradiction with Global Circulation Models that predict constant-with-height vertical profiles due to subsidence at the north pole. © 2009 Elsevier Inc. All rights reserved. Article in Journal/Newspaper North Pole Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) North Pole Icarus 205 2 559 570 |