Titan's bright spots

Multiband spectroscopic measurement of surface diversity and hazes

Mate Ádámkovics, Imke de Pater, M. Hartung, F. Eisenhauer, R. Genzel, Caitlin Griffith

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Spatially resolved near-infrared spectra of Titan, which simultaneously cover two CH4 absorption bands (from 1.45 to 2.45 μm), have been obtained using the SINFONI integral-field spectrometer with adaptive optics at the Very Large Telescope (VLT) of the European Southern Observatory. We observe the enhancement in 2 μm surface albedo of the "5 μm bright spot" at 80°W and 24°S, and find an analogously bright region at 2 μm near 88°W and 6°S. Surface albedos are recovered at ∼60 mas (375 km) resolution in both 1.5 and 2.0 μm windows using a two-stream, plane-parallel, radiative transfer model to fit the observed spectra. The surface albedos near the center of the disk range from 8 to 15% at 1.5 μm and are generally ∼2% lower at 2.0 μm. Vertical (altitude) profiles of aerosol extinction that are consistent with the Huygens/DISR measurements are used to model these observations, and we retrieve latitudinal trends in both stratospheric and tropospheric aerosol extinction. On 28 February 2005 UT, the stratospheric aerosol extinction is measured to increase linearly at a rate of 0.65 ± 0.05% per degree latitude from 40°S to 60°N. Meanwhile, the tropospheric haze near the south pole is confined to southern latitudes above 40°S and is enhanced in extinction by a factor of ∼1.7 relative to the extinction measured at 10°S, the latitude where the Huygens probe landed.

Original languageEnglish (US)
Article numberE07S06
JournalJournal of Geophysical Research: Space Physics
Volume111
Issue number7
DOIs
StatePublished - Jul 20 2006

Fingerprint

haze
Titan
Aerosols
Upper atmosphere
extinction
albedo
aerosols
aerosol
Adaptive optics
Radiative transfer
Observatories
Telescopes
Huygens probe
Spectrometers
Absorption spectra
Poles
Infrared radiation
European Southern Observatory
adaptive optics
radiative transfer

ASJC Scopus subject areas

  • Oceanography
  • Astronomy and Astrophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences (miscellaneous)
  • Geophysics
  • Geochemistry and Petrology

Cite this

Titan's bright spots : Multiband spectroscopic measurement of surface diversity and hazes. / Ádámkovics, Mate; de Pater, Imke; Hartung, M.; Eisenhauer, F.; Genzel, R.; Griffith, Caitlin.

In: Journal of Geophysical Research: Space Physics, Vol. 111, No. 7, E07S06, 20.07.2006.

Research output: Contribution to journalArticle

Ádámkovics, Mate ; de Pater, Imke ; Hartung, M. ; Eisenhauer, F. ; Genzel, R. ; Griffith, Caitlin. / Titan's bright spots : Multiband spectroscopic measurement of surface diversity and hazes. In: Journal of Geophysical Research: Space Physics. 2006 ; Vol. 111, No. 7.
@article{4ffb2cd1d98c48c493bdd9de89a0f5c9,
title = "Titan's bright spots: Multiband spectroscopic measurement of surface diversity and hazes",
abstract = "Spatially resolved near-infrared spectra of Titan, which simultaneously cover two CH4 absorption bands (from 1.45 to 2.45 μm), have been obtained using the SINFONI integral-field spectrometer with adaptive optics at the Very Large Telescope (VLT) of the European Southern Observatory. We observe the enhancement in 2 μm surface albedo of the {"}5 μm bright spot{"} at 80°W and 24°S, and find an analogously bright region at 2 μm near 88°W and 6°S. Surface albedos are recovered at ∼60 mas (375 km) resolution in both 1.5 and 2.0 μm windows using a two-stream, plane-parallel, radiative transfer model to fit the observed spectra. The surface albedos near the center of the disk range from 8 to 15{\%} at 1.5 μm and are generally ∼2{\%} lower at 2.0 μm. Vertical (altitude) profiles of aerosol extinction that are consistent with the Huygens/DISR measurements are used to model these observations, and we retrieve latitudinal trends in both stratospheric and tropospheric aerosol extinction. On 28 February 2005 UT, the stratospheric aerosol extinction is measured to increase linearly at a rate of 0.65 ± 0.05{\%} per degree latitude from 40°S to 60°N. Meanwhile, the tropospheric haze near the south pole is confined to southern latitudes above 40°S and is enhanced in extinction by a factor of ∼1.7 relative to the extinction measured at 10°S, the latitude where the Huygens probe landed.",
author = "Mate {\'A}d{\'a}mkovics and {de Pater}, Imke and M. Hartung and F. Eisenhauer and R. Genzel and Caitlin Griffith",
year = "2006",
month = "7",
day = "20",
doi = "10.1029/2005JE002610",
language = "English (US)",
volume = "111",
journal = "Journal of Geophysical Research: Space Physics",
issn = "2169-9380",
publisher = "Wiley-Blackwell",
number = "7",

}

TY - JOUR

T1 - Titan's bright spots

T2 - Multiband spectroscopic measurement of surface diversity and hazes

AU - Ádámkovics, Mate

AU - de Pater, Imke

AU - Hartung, M.

AU - Eisenhauer, F.

AU - Genzel, R.

AU - Griffith, Caitlin

PY - 2006/7/20

Y1 - 2006/7/20

N2 - Spatially resolved near-infrared spectra of Titan, which simultaneously cover two CH4 absorption bands (from 1.45 to 2.45 μm), have been obtained using the SINFONI integral-field spectrometer with adaptive optics at the Very Large Telescope (VLT) of the European Southern Observatory. We observe the enhancement in 2 μm surface albedo of the "5 μm bright spot" at 80°W and 24°S, and find an analogously bright region at 2 μm near 88°W and 6°S. Surface albedos are recovered at ∼60 mas (375 km) resolution in both 1.5 and 2.0 μm windows using a two-stream, plane-parallel, radiative transfer model to fit the observed spectra. The surface albedos near the center of the disk range from 8 to 15% at 1.5 μm and are generally ∼2% lower at 2.0 μm. Vertical (altitude) profiles of aerosol extinction that are consistent with the Huygens/DISR measurements are used to model these observations, and we retrieve latitudinal trends in both stratospheric and tropospheric aerosol extinction. On 28 February 2005 UT, the stratospheric aerosol extinction is measured to increase linearly at a rate of 0.65 ± 0.05% per degree latitude from 40°S to 60°N. Meanwhile, the tropospheric haze near the south pole is confined to southern latitudes above 40°S and is enhanced in extinction by a factor of ∼1.7 relative to the extinction measured at 10°S, the latitude where the Huygens probe landed.

AB - Spatially resolved near-infrared spectra of Titan, which simultaneously cover two CH4 absorption bands (from 1.45 to 2.45 μm), have been obtained using the SINFONI integral-field spectrometer with adaptive optics at the Very Large Telescope (VLT) of the European Southern Observatory. We observe the enhancement in 2 μm surface albedo of the "5 μm bright spot" at 80°W and 24°S, and find an analogously bright region at 2 μm near 88°W and 6°S. Surface albedos are recovered at ∼60 mas (375 km) resolution in both 1.5 and 2.0 μm windows using a two-stream, plane-parallel, radiative transfer model to fit the observed spectra. The surface albedos near the center of the disk range from 8 to 15% at 1.5 μm and are generally ∼2% lower at 2.0 μm. Vertical (altitude) profiles of aerosol extinction that are consistent with the Huygens/DISR measurements are used to model these observations, and we retrieve latitudinal trends in both stratospheric and tropospheric aerosol extinction. On 28 February 2005 UT, the stratospheric aerosol extinction is measured to increase linearly at a rate of 0.65 ± 0.05% per degree latitude from 40°S to 60°N. Meanwhile, the tropospheric haze near the south pole is confined to southern latitudes above 40°S and is enhanced in extinction by a factor of ∼1.7 relative to the extinction measured at 10°S, the latitude where the Huygens probe landed.

UR - http://www.scopus.com/inward/record.url?scp=33751087482&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33751087482&partnerID=8YFLogxK

U2 - 10.1029/2005JE002610

DO - 10.1029/2005JE002610

M3 - Article

VL - 111

JO - Journal of Geophysical Research: Space Physics

JF - Journal of Geophysical Research: Space Physics

SN - 2169-9380

IS - 7

M1 - E07S06

ER -