Published January 9, 2023 | Version v3
Dataset Open

RT Dataset -- Updated radiative transfer model for Titan in the near-infrared wavelength range: Validation against Huygens atmospheric and surface measurements and application to the Cassini/VIMS observations of the Dragonfly landing area

Creators

  • 1. Université Paris Cité, Institut de physique du globe de Paris (IPGP), CNRS, Paris, France
  • 2. LATMOS/IPSL, UVSQ Université Paris-Saclay, Sorbonne Université, CNRS, Guyancourt, France
  • 3. Groupe de Spectrométrie Moléculaire et Atmosphérique, UMR CNRS 7331, Université de Reims Champagne-Ardenne, Reims, France
  • 4. LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université Paris Cité, 5 place Jules Janssen, 92195, Meudon, France
  • 5. Nature Astronomy, Springer Nature, 4 Crinan Street, London N1 9XW, UK
  • 6. Aurora Technology B.V. for ESA — European Space Agency, European Space Astronomy Centre (ESAC), Camino Bajo del Castillo s/n, Urb. Villafranca del Castillo, 28692 Villanueva de la Cañada, Madrid, Spain
  • 7. Lunar and Planetary Laboratory, 1629 E University Blvd Tucson AZ 85721-0092, USA
  • 8. Laboratoire de Planétologie et Géosciences, CNRS UMR 6112, Nantes Université, Université d'Angers, Université du Mans, Nantes, France
  • 9. Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), UVSQ/CNRS/Paris VI, UMR 8190, F-78280 Guyancourt, Institut Universitaire de France (IUF), Paris, France
  • 10. Department of Earth Sciences, The University of Western Ontario, London, ON N6A 5B7, Canada
  • 11. Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723, USA
  • 12. Hellenic Space Center, Athens, Greece

Description

This dataset contains all Radiative Transfer (RT) results made for the paper.

The data are stored in 5 zipped-folders names with the Cassini/VIMS cube flyby and id, or explicitly for Huygens/ULIS calibrated observations:

  • TB_C1481624349_1
  • T40_C1578266417_1
  • T38_C1575509158_1
  • T40_C1578263500_1
  • T40_C1578263152_1
  • ULIS_observations

The TB_C1481624349_1 folder contains the Cassini/VIMS cube over HLS, the HLS end-member (End_member.txt), the surface albedo retrieved by Karkoschka et al. (2016) corrected for the photometry (HLS_Karkoschka_2016_spectrum.txt), and the inverted surface albedo (Surface_albedo.txt).

In these folders, each VIMS pixel is stored in a .txt file with the following pattern:

<CUBE_ID>_<PIXEL_SAMPLE>_<PIXEL_LINE> .txt

It starts with a header describing the observation: 

  • CUBE_ID: the VIMS cube id (`C1234567890_1` format)
  • SAMPLE: the pixel sample number.
  • LINE: the pixel line number.
  • LONG: the pixel longitude (in degree).
  • LAT: the pixel latitude (in degree).
  • INC: the surface incident angle (in degree).
  • EMI: the surface emergent angle (in degree).
  • PHASE: the surface phase angle (in degree).

For the Selk crater cubes (T40_C1578266417_1, T38_C1575509158_1, T40_C1578263500_1, T40_C1578263152_1), the header also contains the spatial sampling and the radiative transfer model outputs: 

  • Spatial sampling (km/pix).
  • Fh: the haze scaling factor.
  • Fm: the mist scaling factor.
  • 1-sigma (Fh): the 1-sigma uncertainty on Fh.
  • 1-sigma (Fm): the 1-sigma uncertainty on Fm.
  • Reduced chi2: the reduced chi2. 

Then contains the observed spectra:

  • Column 1: the VIMS channel central wavelength (in micrometers).
  • Column 2: the VIMS pixel I/F.
  • Column 3: the VIMS pixel I/F 1-sigma uncertainty. 

For the Selk crater cubes (T40_C1578266417_1, T38_C1575509158_1, T40_C1578263500_1, T40_C1578263152_1), 3 columns are added for: 

  • Column 4: the surface albedo.
  • Column 5: the upper 1-sigma uncertainty on the surface albedo.
  • Column 6 : the lower 1-sigma uncertainty on the surface albedo.

The ULIS folder contains the Huygens/ULIS calibrated observations (in I/F) and the simulations with 1-sigma uncertainties as a function of the altitude (in km):

  • Column 1: the VIMS channel central wavelength (in micrometers), stopped at the end of the Huygens/ULIS wavelength range.
  • Column 2: the ULIS I/F.
  • Column 3 : the simulated I/F.
  • Column 4: the lower 1-sigma uncertainty on the simulation.
  • Column 5 : the upper 1-sigma uncertainty on the simulation.

Files

T38_1575509158_1.zip

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Additional details

Funding

Agence Nationale de la Recherche
RaD-net - 3D radiative transfer in cloudy planetary atmospheres: applications to Titan, Venus and Mars ANR-21-CE49-0020