Publication Abstracts

Fauchez et al. 2020

Fauchez, T., M. Turbet, E.T. Wolf, I. Boutle, M.J. Way, A.D. Del Genio, N.J. Mayne, K. Tsigaridis, R.K. Kopparapu, J. Yang, F. Forget, A. Mandell, and S.D. Domagal Goldman, 2020: TRAPPIST-1 Habitable Atmosphere Intercomparison (THAI). Motivations and protocol. Geosci. Model Dev., 13, 707-716, doi:10.5194/gmd-13-707-2020.

Upcoming telescopes such as the James Webb Space Telescope (JWST), the European Extremely Large Telescope (E-ELT), the Thirty Meter Telescope (TMT) or the Giant Magellan Telescope (GMT) may soon be able to characterize, through transmission, emission or reflection spectroscopy, the atmospheres of rocky exoplanets orbiting nearby M dwarfs. One of the most promising candidates is the late M-dwarf system TRAPPIST-1, which has seven known transiting planets for which transit timing variation (TTV) measurements suggest that they are terrestrial in nature, with a possible enrichment in volatiles. Among these seven planets, TRAPPIST-1e seems to be the most promising candidate to have habitable surface conditions, receiving ∼66% of the Earth's incident radiation and thus needing only modest greenhouse gas inventories to raise surface temperatures to allow surface liquid water to exist. TRAPPIST-1e is, therefore, one of the prime targets for the JWST atmospheric characterization. In this context, the modeling of its potential atmosphere is an essential step prior to observation. Global climate models (GCMs) offer the most detailed way to simulate planetary atmospheres. However, intrinsic differences exist between GCMs which can lead to different climate prediction and thus observability of gas and/or cloud features in transmission and thermal emission spectra. Such differences should preferably be known prior to observations. In this paper we present a protocol to intercompare planetary GCMs. Four testing cases are considered for TRAPPIST-1e, but the methodology is applicable to other rocky exoplanets in the habitable zone. The four test cases included two land planets composed of modern-Earth and pure-CO2 atmospheres and two aqua planets with the same atmospheric compositions. Currently, there are four participating models (LMDG, ROCKE-3D, ExoCAM, UM); however, this protocol is intended to let other teams participate as well.

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BibTeX Citation

  author={Fauchez, T. and Turbet, M. and Wolf, E. T. and Boutle, I. and Way, M. J. and Del Genio, A. D. and Mayne, N. J. and Tsigaridis, K. and Kopparapu, R. K. and Yang, J. and Forget, F. and Mandell, A. and Domagal Goldman, S. D.},
  title={TRAPPIST-1 Habitable Atmosphere Intercomparison (THAI). Motivations and protocol},
  journal={Geosci. Model Dev.},

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RIS Citation

ID  - fa04100o
AU  - Fauchez, T.
AU  - Turbet, M.
AU  - Wolf, E. T.
AU  - Boutle, I.
AU  - Way, M. J.
AU  - Del Genio, A. D.
AU  - Mayne, N. J.
AU  - Tsigaridis, K.
AU  - Kopparapu, R. K.
AU  - Yang, J.
AU  - Forget, F.
AU  - Mandell, A.
AU  - Domagal Goldman, S. D.
PY  - 2020
TI  - TRAPPIST-1 Habitable Atmosphere Intercomparison (THAI). Motivations and protocol
JA  - Geosci. Model Dev.
VL  - 13
SP  - 707
EP  - 716
DO  - 10.5194/gmd-13-707-2020
ER  -

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