Titan’s temporal evolution in stratospheric trace gases near the poles
International audience We analyze spectra acquired by the Cassini/Composite Infrared Spectrometer (CIRS) at high resolution from October 2010 until September 2014 in nadir mode. Up until mid 2012, Titan’s Northern atmosphere exhibited the enriched chemical content found since the Voyager days (Novem...
Published in: | Icarus |
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Main Authors: | , , , , , , , , , |
Other Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2015
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Online Access: | https://hal.sorbonne-universite.fr/hal-01198804 https://hal.sorbonne-universite.fr/hal-01198804/document https://hal.sorbonne-universite.fr/hal-01198804/file/Coustenis_Titan%E2%80%99s_temporal.pdf https://doi.org/10.1016/j.icarus.2015.08.027 |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Titan composition structure Satellites evolution Atmospheres atmosphere [SDU]Sciences of the Universe [physics] [SDU.OCEAN]Sciences of the Universe [physics]/Ocean |
spellingShingle |
Titan composition structure Satellites evolution Atmospheres atmosphere [SDU]Sciences of the Universe [physics] [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Coustenis, Athena Jennings, Donald E. Achterberg, Richard K. Bampasidis, Georgios Lavvas, Panayotis Nixon, Conor A. Teanby, Nicholas A. Anderson, Carrie M. Cottini, Valeria Flasar, F. Michael Titan’s temporal evolution in stratospheric trace gases near the poles |
topic_facet |
Titan composition structure Satellites evolution Atmospheres atmosphere [SDU]Sciences of the Universe [physics] [SDU.OCEAN]Sciences of the Universe [physics]/Ocean |
description |
International audience We analyze spectra acquired by the Cassini/Composite Infrared Spectrometer (CIRS) at high resolution from October 2010 until September 2014 in nadir mode. Up until mid 2012, Titan’s Northern atmosphere exhibited the enriched chemical content found since the Voyager days (November 1980), with a peak around the Northern Spring Equinox (NSE) in 2009. Since then, we have observed the appearance at Titan’s south pole of several trace species for the first time, such as HC3N and C6H6, observed only at high northern latitudes before equinox. We investigate here latitudes poleward of 50°S and 50°N from 2010 (after the Southern Autumnal Equinox) until 2014. For some of the most abundant and longest-lived hydrocarbons (C2H2, C2H6 and C3H8) and CO2, the evolution in the past 4 years at a given latitude is not very significant within error bars especially until mid-2013. In more recent dates, these molecules show a trend for increase in the south. This trend is dramatically more pronounced for the other trace species, especially in 2013–2014, and at 70°S relative to 50°S. These two regions then demonstrate that they are subject to different dynamical processes in and out of the polar vortex region. For most species, we find higher abundances at 50°N compared to 50°S, with the exception of C3H8, CO2, C6H6 and HC3N, which arrive at similar mixing ratios after mid-2013. While the 70°N data show generally no change with a trend rather to a small decrease for most species within 2014, the 70°S results indicate a strong enhancement in trace stratospheric gases after 2012. The 663 cm−1 HC3N and the C6H6 674 cm−1 emission bands appeared in late 2011/early 2012 in the south polar regions and have since then exhibited a dramatic increase in their abundances. At 70°S HC3N, HCN and C6H6 have increased by 3 orders of magnitude over the past 3–4 years while other molecules, including C2H4, C3H4 and C4H2, have increased less sharply (by 1–2 orders of magnitude). This is a strong indication of the rapid and sudden ... |
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) NASA Goddard Space Flight Center (GSFC) Department of Astronomy College Park University of Maryland College Park University of Maryland System-University of Maryland System National and Kapodistrian University of Athens (NKUA) School of Earth Sciences Bristol University of Bristol Bristol Department of Atmospheric, Oceanic and Planetary Physics Oxford (AOPP) University of Oxford Oxford |
format |
Article in Journal/Newspaper |
author |
Coustenis, Athena Jennings, Donald E. Achterberg, Richard K. Bampasidis, Georgios Lavvas, Panayotis Nixon, Conor A. Teanby, Nicholas A. Anderson, Carrie M. Cottini, Valeria Flasar, F. Michael |
author_facet |
Coustenis, Athena Jennings, Donald E. Achterberg, Richard K. Bampasidis, Georgios Lavvas, Panayotis Nixon, Conor A. Teanby, Nicholas A. Anderson, Carrie M. Cottini, Valeria Flasar, F. Michael |
author_sort |
Coustenis, Athena |
title |
Titan’s temporal evolution in stratospheric trace gases near the poles |
title_short |
Titan’s temporal evolution in stratospheric trace gases near the poles |
title_full |
Titan’s temporal evolution in stratospheric trace gases near the poles |
title_fullStr |
Titan’s temporal evolution in stratospheric trace gases near the poles |
title_full_unstemmed |
Titan’s temporal evolution in stratospheric trace gases near the poles |
title_sort |
titan’s temporal evolution in stratospheric trace gases near the poles |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal.sorbonne-universite.fr/hal-01198804 https://hal.sorbonne-universite.fr/hal-01198804/document https://hal.sorbonne-universite.fr/hal-01198804/file/Coustenis_Titan%E2%80%99s_temporal.pdf https://doi.org/10.1016/j.icarus.2015.08.027 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_source |
ISSN: 0019-1035 EISSN: 1090-2643 Icarus https://hal.sorbonne-universite.fr/hal-01198804 Icarus, Elsevier, 2015, 270, pp.409-420. ⟨10.1016/j.icarus.2015.08.027⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.icarus.2015.08.027 hal-01198804 https://hal.sorbonne-universite.fr/hal-01198804 https://hal.sorbonne-universite.fr/hal-01198804/document https://hal.sorbonne-universite.fr/hal-01198804/file/Coustenis_Titan%E2%80%99s_temporal.pdf BIBCODE: 2016Icar.270.409C doi:10.1016/j.icarus.2015.08.027 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.icarus.2015.08.027 |
container_title |
Icarus |
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270 |
container_start_page |
409 |
op_container_end_page |
420 |
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1766202957168115712 |
spelling |
ftccsdartic:oai:HAL:hal-01198804v1 2023-05-15T18:23:23+02:00 Titan’s temporal evolution in stratospheric trace gases near the poles Coustenis, Athena Jennings, Donald E. Achterberg, Richard K. Bampasidis, Georgios Lavvas, Panayotis Nixon, Conor A. Teanby, Nicholas A. Anderson, Carrie M. Cottini, Valeria Flasar, F. Michael 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) NASA Goddard Space Flight Center (GSFC) Department of Astronomy College Park University of Maryland College Park University of Maryland System-University of Maryland System National and Kapodistrian University of Athens (NKUA) School of Earth Sciences Bristol University of Bristol Bristol Department of Atmospheric, Oceanic and Planetary Physics Oxford (AOPP) University of Oxford Oxford 2015-08 https://hal.sorbonne-universite.fr/hal-01198804 https://hal.sorbonne-universite.fr/hal-01198804/document https://hal.sorbonne-universite.fr/hal-01198804/file/Coustenis_Titan%E2%80%99s_temporal.pdf https://doi.org/10.1016/j.icarus.2015.08.027 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.icarus.2015.08.027 hal-01198804 https://hal.sorbonne-universite.fr/hal-01198804 https://hal.sorbonne-universite.fr/hal-01198804/document https://hal.sorbonne-universite.fr/hal-01198804/file/Coustenis_Titan%E2%80%99s_temporal.pdf BIBCODE: 2016Icar.270.409C doi:10.1016/j.icarus.2015.08.027 info:eu-repo/semantics/OpenAccess ISSN: 0019-1035 EISSN: 1090-2643 Icarus https://hal.sorbonne-universite.fr/hal-01198804 Icarus, Elsevier, 2015, 270, pp.409-420. ⟨10.1016/j.icarus.2015.08.027⟩ Titan composition structure Satellites evolution Atmospheres atmosphere [SDU]Sciences of the Universe [physics] [SDU.OCEAN]Sciences of the Universe [physics]/Ocean info:eu-repo/semantics/article Journal articles 2015 ftccsdartic https://doi.org/10.1016/j.icarus.2015.08.027 2021-11-21T03:04:08Z International audience We analyze spectra acquired by the Cassini/Composite Infrared Spectrometer (CIRS) at high resolution from October 2010 until September 2014 in nadir mode. Up until mid 2012, Titan’s Northern atmosphere exhibited the enriched chemical content found since the Voyager days (November 1980), with a peak around the Northern Spring Equinox (NSE) in 2009. Since then, we have observed the appearance at Titan’s south pole of several trace species for the first time, such as HC3N and C6H6, observed only at high northern latitudes before equinox. We investigate here latitudes poleward of 50°S and 50°N from 2010 (after the Southern Autumnal Equinox) until 2014. For some of the most abundant and longest-lived hydrocarbons (C2H2, C2H6 and C3H8) and CO2, the evolution in the past 4 years at a given latitude is not very significant within error bars especially until mid-2013. In more recent dates, these molecules show a trend for increase in the south. This trend is dramatically more pronounced for the other trace species, especially in 2013–2014, and at 70°S relative to 50°S. These two regions then demonstrate that they are subject to different dynamical processes in and out of the polar vortex region. For most species, we find higher abundances at 50°N compared to 50°S, with the exception of C3H8, CO2, C6H6 and HC3N, which arrive at similar mixing ratios after mid-2013. While the 70°N data show generally no change with a trend rather to a small decrease for most species within 2014, the 70°S results indicate a strong enhancement in trace stratospheric gases after 2012. The 663 cm−1 HC3N and the C6H6 674 cm−1 emission bands appeared in late 2011/early 2012 in the south polar regions and have since then exhibited a dramatic increase in their abundances. At 70°S HC3N, HCN and C6H6 have increased by 3 orders of magnitude over the past 3–4 years while other molecules, including C2H4, C3H4 and C4H2, have increased less sharply (by 1–2 orders of magnitude). This is a strong indication of the rapid and sudden ... Article in Journal/Newspaper South pole Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) South Pole Icarus 270 409 420 |