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How to Tackle the Computational Challenges of Line-by-line Modelling

Schreier, Franz and Gimeno Garcia, Sebastian and Kohlert, Dieter (2015) How to Tackle the Computational Challenges of Line-by-line Modelling. Spectroscopy of Exoplanets, 24 — 26 July 2015, Cumberland Lodge, Great Park, Windsor, UK.

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Abstract

Despite of significant advances of computational power, line-by-line modeling of molecular absorption and radiative transfer remains a challenge. In case of Earth atmospheric remote sensing, the number of spectra to be processed operationally has grown substantially. In contrast the number of planetary spectra is quite limited, however, the number of spectroscopic transitions to be considered, esp. for hot Jupiters (or Venus in our solar system), has increased to millions or billions. In this contribution we present our approach to tackle this computational challenge in our lbl atmospheric radiative transfer code GARLIC (Generic Atmospheric Radiation Line-by-line Infrared Code, Fortran 2003). A highly optimized Voigt function algorithm along with a 'multigrid' approach is employed for computation of lbl molecular absorption cross sections. Multithreading by OpenMp allows to further speed-up the cross section, absorption coefficient, and atmospheric radiative transfer modules. Furthermore, we briefly discuss the option of hardware accelerators for the most demanding cross sections. Finally, Jacobians are required to solve the nonlinear inverse problems to be solved for the analysis of an increasing number of exoplanet observations and we present algorithmic differentiation as a technique to implement accurate and efficient derivatives.

Item URL in elib:https://elib.dlr.de/97279/
Document Type:Conference or Workshop Item (Speech)
Title:How to Tackle the Computational Challenges of Line-by-line Modelling
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schreier, Franzfranz.schreier (at) dlr.deUNSPECIFIED
Gimeno Garcia, Sebastiansebastian.gimenogarcia (at) dlr.deUNSPECIFIED
Kohlert, DieterFachhochschule RegensburgUNSPECIFIED
Date:July 2015
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Atmospheric radiative transfer, Molecular absorption, Voigt function, Multigrid algorithms, Algorithmic differentiation FPGA
Event Title:Spectroscopy of Exoplanets
Event Location:Cumberland Lodge, Great Park, Windsor, UK
Event Type:international Conference
Event Dates:24 — 26 July 2015
Organizer:University College London, ExoMol group
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:13 Aug 2015 17:59
Last Modified:31 Jul 2019 19:54

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