Elusive ethylene detected in Saturn's northern storm region

B. E. Hesman, G. L. Bjoraker, P. V. Sada, R. K. Achterberg, D. E. Jennings, P. N. Romani, A. W. Lunsford, L. N. Fletcher, R. J. Boyle, A. A. Simon-Miller, C. A. Nixon, P. G J Irwin

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The massive eruption at 40°N (planetographic latitude) on Saturn in 2010 December has produced significant and lasting effects in the northern hemisphere on temperature and species abundances. The northern storm region was observed on many occasions in 2011 by Cassini's Composite Infrared Spectrometer (CIRS). In 2011 May, temperatures in the stratosphere greater than 200K were derived from CIRS spectra in the regions referred to as "beacons" (warm regions in the stratosphere). Ethylene has been detected in the beacon region in Saturn's northern storm region using CIRS. Ground-based observations using the high-resolution spectrometer Celeste on the McMath-Pierce Telescope on 2011 May 15 were used to confirm the detection and improve the altitude resolution in the retrieved profile. The derived ethylene profile from the CIRS data gives a C2H4mole fraction of 5.9 ± 4.5 × 10-7at 0.5 mbar, and from Celeste data it gives 2.7 ± 0.45 × 10-6at 0.1 mbar. This is two orders of magnitude higher than the amount measured in the ultraviolet at other latitudes prior to the storm. It is also much higher than predicted by photochemical models, indicating that perhaps another production mechanism is required or a loss mechanism is being inhibited. © 2012. The American Astronomical Society. All rights reserved.
Original languageEnglish
JournalAstrophysical Journal
DOIs
Publication statusPublished - 20 Nov 2012

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infrared spectrometers
Saturn
ethylene
spectrometer
beacons
composite materials
stratosphere
Northern Hemisphere
profiles
volcanic eruptions
telescopes
spectrometers
volcanic eruption
temperature
high resolution

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Hesman, B. E., Bjoraker, G. L., Sada, P. V., Achterberg, R. K., Jennings, D. E., Romani, P. N., ... Irwin, P. G. J. (2012). Elusive ethylene detected in Saturn's northern storm region. Astrophysical Journal. https://doi.org/10.1088/0004-637X/760/1/24
Hesman, B. E. ; Bjoraker, G. L. ; Sada, P. V. ; Achterberg, R. K. ; Jennings, D. E. ; Romani, P. N. ; Lunsford, A. W. ; Fletcher, L. N. ; Boyle, R. J. ; Simon-Miller, A. A. ; Nixon, C. A. ; Irwin, P. G J. / Elusive ethylene detected in Saturn's northern storm region. In: Astrophysical Journal. 2012.
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abstract = "The massive eruption at 40°N (planetographic latitude) on Saturn in 2010 December has produced significant and lasting effects in the northern hemisphere on temperature and species abundances. The northern storm region was observed on many occasions in 2011 by Cassini's Composite Infrared Spectrometer (CIRS). In 2011 May, temperatures in the stratosphere greater than 200K were derived from CIRS spectra in the regions referred to as {"}beacons{"} (warm regions in the stratosphere). Ethylene has been detected in the beacon region in Saturn's northern storm region using CIRS. Ground-based observations using the high-resolution spectrometer Celeste on the McMath-Pierce Telescope on 2011 May 15 were used to confirm the detection and improve the altitude resolution in the retrieved profile. The derived ethylene profile from the CIRS data gives a C2H4mole fraction of 5.9 ± 4.5 × 10-7at 0.5 mbar, and from Celeste data it gives 2.7 ± 0.45 × 10-6at 0.1 mbar. This is two orders of magnitude higher than the amount measured in the ultraviolet at other latitudes prior to the storm. It is also much higher than predicted by photochemical models, indicating that perhaps another production mechanism is required or a loss mechanism is being inhibited. {\circledC} 2012. The American Astronomical Society. All rights reserved.",
author = "Hesman, {B. E.} and Bjoraker, {G. L.} and Sada, {P. V.} and Achterberg, {R. K.} and Jennings, {D. E.} and Romani, {P. N.} and Lunsford, {A. W.} and Fletcher, {L. N.} and Boyle, {R. J.} and Simon-Miller, {A. A.} and Nixon, {C. A.} and Irwin, {P. G J}",
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Hesman, BE, Bjoraker, GL, Sada, PV, Achterberg, RK, Jennings, DE, Romani, PN, Lunsford, AW, Fletcher, LN, Boyle, RJ, Simon-Miller, AA, Nixon, CA & Irwin, PGJ 2012, 'Elusive ethylene detected in Saturn's northern storm region', Astrophysical Journal. https://doi.org/10.1088/0004-637X/760/1/24

Elusive ethylene detected in Saturn's northern storm region. / Hesman, B. E.; Bjoraker, G. L.; Sada, P. V.; Achterberg, R. K.; Jennings, D. E.; Romani, P. N.; Lunsford, A. W.; Fletcher, L. N.; Boyle, R. J.; Simon-Miller, A. A.; Nixon, C. A.; Irwin, P. G J.

In: Astrophysical Journal, 20.11.2012.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Elusive ethylene detected in Saturn's northern storm region

AU - Hesman, B. E.

AU - Bjoraker, G. L.

AU - Sada, P. V.

AU - Achterberg, R. K.

AU - Jennings, D. E.

AU - Romani, P. N.

AU - Lunsford, A. W.

AU - Fletcher, L. N.

AU - Boyle, R. J.

AU - Simon-Miller, A. A.

AU - Nixon, C. A.

AU - Irwin, P. G J

PY - 2012/11/20

Y1 - 2012/11/20

N2 - The massive eruption at 40°N (planetographic latitude) on Saturn in 2010 December has produced significant and lasting effects in the northern hemisphere on temperature and species abundances. The northern storm region was observed on many occasions in 2011 by Cassini's Composite Infrared Spectrometer (CIRS). In 2011 May, temperatures in the stratosphere greater than 200K were derived from CIRS spectra in the regions referred to as "beacons" (warm regions in the stratosphere). Ethylene has been detected in the beacon region in Saturn's northern storm region using CIRS. Ground-based observations using the high-resolution spectrometer Celeste on the McMath-Pierce Telescope on 2011 May 15 were used to confirm the detection and improve the altitude resolution in the retrieved profile. The derived ethylene profile from the CIRS data gives a C2H4mole fraction of 5.9 ± 4.5 × 10-7at 0.5 mbar, and from Celeste data it gives 2.7 ± 0.45 × 10-6at 0.1 mbar. This is two orders of magnitude higher than the amount measured in the ultraviolet at other latitudes prior to the storm. It is also much higher than predicted by photochemical models, indicating that perhaps another production mechanism is required or a loss mechanism is being inhibited. © 2012. The American Astronomical Society. All rights reserved.

AB - The massive eruption at 40°N (planetographic latitude) on Saturn in 2010 December has produced significant and lasting effects in the northern hemisphere on temperature and species abundances. The northern storm region was observed on many occasions in 2011 by Cassini's Composite Infrared Spectrometer (CIRS). In 2011 May, temperatures in the stratosphere greater than 200K were derived from CIRS spectra in the regions referred to as "beacons" (warm regions in the stratosphere). Ethylene has been detected in the beacon region in Saturn's northern storm region using CIRS. Ground-based observations using the high-resolution spectrometer Celeste on the McMath-Pierce Telescope on 2011 May 15 were used to confirm the detection and improve the altitude resolution in the retrieved profile. The derived ethylene profile from the CIRS data gives a C2H4mole fraction of 5.9 ± 4.5 × 10-7at 0.5 mbar, and from Celeste data it gives 2.7 ± 0.45 × 10-6at 0.1 mbar. This is two orders of magnitude higher than the amount measured in the ultraviolet at other latitudes prior to the storm. It is also much higher than predicted by photochemical models, indicating that perhaps another production mechanism is required or a loss mechanism is being inhibited. © 2012. The American Astronomical Society. All rights reserved.

U2 - 10.1088/0004-637X/760/1/24

DO - 10.1088/0004-637X/760/1/24

M3 - Article

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

ER -