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A First Look at Inverse Problems for the Atmospheres of M and G Earth-like Planets

Vasquez, Mayte and Schreier, Franz and Trautmann, Thomas (2015) A First Look at Inverse Problems for the Atmospheres of M and G Earth-like Planets. Atmosphere Science in the Context of CHEOPS, TESS, K2 and PLATO, 2-4 March 2015, Berlin, Germany.

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Abstract

This work addresses the main question regarding how much can we learn from spectroscopic observations of Earth-like exoplanets along with what can we identify in terms of atmospheric conditions and biosignatures that may be present on the planet and serve as evidence of life. Using a high resolution infrared radiative transfer model, we calculate the emission spectra of Earth-like exoplanets and their partial derivatives with respect to the unknowns of the inverse problem (i.e. the Jacobians). Sensitivity analysis based on Jacobian matrices revealed which parameters can be retrieved independently and which parameters have to be set a priori, depending on the type of observation and spectral domain. A set of few optimized state vectors were used for extensive retrieval simulations investigating impact of the initial guess and a priori data information content. The calculations provided information on data quality depending on the spectral range, resolution, and number of molecular species considered in the atmosphere. Larger correlations were found between certain parameters, what provided information about the difficulty of retrieving a certain parameter independently. A sensitivity study has also been conducted in order to assess the feasibility of retrieving CO2 and H2O molecular concentrations from an observed spectrum with a 1% noise level. Also, comparisons between analytical and numerical Jacobians were studied.

Item URL in elib:https://elib.dlr.de/95942/
Document Type:Conference or Workshop Item (Poster)
Title:A First Look at Inverse Problems for the Atmospheres of M and G Earth-like Planets
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Vasquez, Maytemayte.vasquez (at) dlr.deUNSPECIFIED
Schreier, Franzfranz.schreier (at) dlr.deUNSPECIFIED
Trautmann, Thomasthomas.trautmann (at) dlr.deUNSPECIFIED
Date:9 March 2015
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Atmospheric remote sensing Jacobians Sensitivity
Event Title:Atmosphere Science in the Context of CHEOPS, TESS, K2 and PLATO
Event Location:Berlin, Germany
Event Type:international Conference
Event Dates:2-4 March 2015
Organizer:DLR - IPF
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Spektrometrische Verfahren und Konzepte der Fernerkundung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Atmospheric Processors
Deposited By: Schreier, Dr.rer.nat. Franz
Deposited On:15 Apr 2015 14:19
Last Modified:31 Jul 2019 19:52

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