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Effects of Clouds on High Resolution Thermal Emission Spectra of Terrestrial Exo-Planets

Vasquez, Mayte and Schreier, Franz and Kitzmann, Daniel and Patzer, Beate and Rauer, Heike and Gimeno Garcia, Sebastian and Trautmann, Thomas (2012) Effects of Clouds on High Resolution Thermal Emission Spectra of Terrestrial Exo-Planets. In: Geophysical Research Abstracts, 14 (EGU2012-11168). European Geosciences Union (EGU). European Geosciences Union General Assembly 2012, 22 – 27 April 2012, Vienna, Austria.

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Official URL: http://meetingorganizer.copernicus.org/EGU2012/EGU2012-11168.pdf


For an investigation of the potential habitability of terrestrial exo-planets the spectroscopic characterization of the planetary atmosphere and the identification of biomarker signatures is crucial. The radiative transfer is critically dependent on atmospheric (pressure, temperature, composition) and surface conditions. In particular, clouds can have a large impact on the planetary spectra (intensities and shapes) due to extinction events. Here the effects of the presence of clouds in Earth-like planetary atmosphere are studied with a high resolution radiative transfer model and compared to low and moderate resolution spectra. Infrared transmission and emission spectra are modeled using a combination of a line-by-line (lbl) molecular absorption code with a multiple scattering radiative transfer solver. Temperature profiles and low resolution spectra for Earth-like planets around different types of central stars have been taken from a radiative-convectiveclimate model with a parametrized cloud description (see Kitzmann et al. 2010, AA, Vol 511, A66). The new lbl-multiple scattering code was tested successfully with respect to consistency to a low resolution radiative transfer code and by comparisions with Venus observations. The dependency of biomarker signatures on the presence of low-level water and high-level ice clouds is studied, e.g. for the thermal infrared band of ozone at 9.6 micrometer. Results indicate the important impact of clouds on the detectability of biomarkermolecules by dampening their spectral signatures. Furthermore, biosignatures may be lost in low resolution spectra leading to false negative classification, i.e. high resolution lbl modeling is mandatory for an assessment of detection feasibility. Hence systematic high resolution studies have to be pursued covering other (UV, Vis, NIR) spectral ranges of interest (other biomolecules).

Item URL in elib:https://elib.dlr.de/75676/
Document Type:Conference or Workshop Item (Poster)
Title:Effects of Clouds on High Resolution Thermal Emission Spectra of Terrestrial Exo-Planets
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Kitzmann, DanielTU BerlinUNSPECIFIED
Patzer, BeateTU BerlinUNSPECIFIED
Gimeno Garcia, SebastianTU MuenchenUNSPECIFIED
Date:27 April 2012
Journal or Publication Title:Geophysical Research Abstracts
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Publisher:European Geosciences Union (EGU)
Keywords:Radiative transfer, Infrared, planetary atmospheres
Event Title:European Geosciences Union General Assembly 2012
Event Location:Vienna, Austria
Event Type:international Conference
Event Dates:22 – 27 April 2012
Organizer:EGU - European Geosciences Union
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Entwicklung von Atmosphärenprozessoren (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Atmospheric Processors
Institute of Planetary Research > Extrasolar Planets and Atmospheres
Deposited By: Schreier, Dr.rer.nat. Franz
Deposited On:15 May 2012 07:53
Last Modified:15 May 2012 07:53

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