GCM simulations of Titan's middle and lower atmosphere and comparison to observations

Juan M. Lora, Jonathan I. Lunine, Joellen Russell

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Simulation results are presented from a new general circulation model (GCM) of Titan, the Titan Atmospheric Model (TAM), which couples the Flexible Modeling System (FMS) spectral dynamical core to a suite of external/sub-grid-scale physics. These include a new non-gray radiative transfer module that takes advantage of recent data from Cassini-Huygens, large-scale condensation and quasi-equilibrium moist convection schemes, a surface model with "bucket" hydrology, and boundary layer turbulent diffusion. The model produces a realistic temperature structure from the surface to the lower mesosphere, including a stratopause, as well as satisfactory superrotation. The latter is shown to depend on the dynamical core's ability to build up angular momentum from surface torques. Simulated latitudinal temperature contrasts are adequate, compared to observations, and polar temperature anomalies agree with observations. In the lower atmosphere, the insolation distribution is shown to strongly impact turbulent fluxes, and surface heating is maximum at mid-latitudes. Surface liquids are unstable at mid- and low-latitudes, and quickly migrate poleward. The simulated humidity profile and distribution of surface temperatures, compared to observations, corroborate the prevalence of dry conditions at low latitudes. Polar cloud activity is well represented, though the observed mid-latitude clouds remain somewhat puzzling, and some formation alternatives are suggested.

Original languageEnglish (US)
Pages (from-to)516-528
Number of pages13
JournalIcarus
Volume250
DOIs
StatePublished - Apr 1 2015

Fingerprint

lower atmosphere
middle atmosphere
Titan
general circulation model
atmosphere
tropical regions
simulation
superrotation
stratopause
insolation
hydrology
buckets
turbulent diffusion
atmospheric models
liquid surfaces
mesosphere
radiative transfer
surface temperature
temperature
torque

Keywords

  • Atmospheres, dynamics
  • Titan, atmosphere
  • Titan, clouds
  • Titan, hydrology

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

GCM simulations of Titan's middle and lower atmosphere and comparison to observations. / Lora, Juan M.; Lunine, Jonathan I.; Russell, Joellen.

In: Icarus, Vol. 250, 01.04.2015, p. 516-528.

Research output: Contribution to journalArticle

Lora, Juan M. ; Lunine, Jonathan I. ; Russell, Joellen. / GCM simulations of Titan's middle and lower atmosphere and comparison to observations. In: Icarus. 2015 ; Vol. 250. pp. 516-528.
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