Group delay reference artifact based on molecular gas absorption

2001 ◽  
Author(s):  
Ali Motamedi ◽  
Bogdan Szafraniec ◽  
Peter Robrish ◽  
Douglas M. Baney
Keyword(s):  
Group Delay ◽  
Gas Absorption ◽  
Molecular Gas

scholarly journals The libRadtran software package for radiative transfer calculations (Version 2.0)

2015 ◽  
Vol 8 (12) ◽  
pp. 10237-10303 ◽  
Author(s):  
C. Emde ◽  
R. Buras-Schnell ◽  
A. Kylling ◽  
B. Mayer ◽  
J. Gasteiger ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Radiative Transfer ◽  
Software Package ◽  
Radiative Forcing ◽  
Gas Absorption ◽  
Molecular Gas ◽  
Photolysis Frequencies ◽  
Aerosol Scattering ◽  
Version 2.0 ◽  
Climate Studies

Abstract. libRadtran is a widely used software package for radiative transfer calculations. It allows to compute (polarized) radiances, irradiances, and actinic fluxes in the solar and thermal spectral regions. libRadtran has been used for various applications, including remote sensing of clouds, aerosols and trace gases in the Earth's atmosphere, climate studies, e.g., for the calculation of radiative forcing due to different atmospheric components, for UV-forcasting, the calculation of photolysis frequencies, and for remote sensing of other planets in our solar system. The package has been described in Mayer and Kylling (2005).. Since then several new features have been included, for example polarization, Raman scattering, a new molecular gas absorption parameterization, and several new cloud and aerosol scattering parameterizations. Furthermore a graphical user interface is now available which greatly simplifies the usage of the model, especially for new users. This paper gives an overview of libRadtran version 2.0 with focus on new features. A complete description of libRadtran and all its input options is given in the user manual included in the libRadtran software package, which is freely available at http://www.libradtran.org.

scholarly journals The libRadtran software package for radiative transfer calculations (version 2.0.1)

2016 ◽  
Vol 9 (5) ◽  
pp. 1647-1672 ◽  
Author(s):  
Claudia Emde ◽  
Robert Buras-Schnell ◽  
Arve Kylling ◽  
Bernhard Mayer ◽  
Josef Gasteiger ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Radiative Transfer ◽  
Graphical User Interface ◽  
Software Package ◽  
Radiative Forcing ◽  
Trace Gases ◽  
Gas Absorption ◽  
Molecular Gas ◽  
Photolysis Frequencies ◽  
Climate Studies

Abstract. libRadtran is a widely used software package for radiative transfer calculations. It allows one to compute (polarized) radiances, irradiance, and actinic fluxes in the solar and thermal spectral regions. libRadtran has been used for various applications, including remote sensing of clouds, aerosols and trace gases in the Earth's atmosphere, climate studies, e.g., for the calculation of radiative forcing due to different atmospheric components, for UV forecasting, the calculation of photolysis frequencies, and for remote sensing of other planets in our solar system. The package has been described in Mayer and Kylling (2005). Since then several new features have been included, for example polarization, Raman scattering, a new molecular gas absorption parameterization, and several new parameterizations of cloud and aerosol optical properties. Furthermore, a graphical user interface is now available, which greatly simplifies the usage of the model, especially for new users. This paper gives an overview of libRadtran version 2.0.1 with a focus on new features. Applications including these new features are provided as examples of use. A complete description of libRadtran and all its input options is given in the user manual included in the libRadtran software package, which is freely available at http://www.libradtran.org.

Molecular Gas Radiation in the Thermal Entrance Region of a Duct

1979 ◽  
Vol 101 (3) ◽  
pp. 489-495 ◽  
Author(s):  
A. Balakrishnan ◽  
D. K. Edwards
Keyword(s):  
Wall Layer ◽  
Gas Absorption ◽  
Entrance Region ◽  
Molecular Gas ◽  
Band Model ◽  
Gas Radiation ◽  
Nusselt Numbers ◽  
Radiation Exchange ◽  
Laminar And Turbulent Flow ◽  
Transmission Factors

The effect of molecular gas radiation upon the thermal development downstream from a step change in wall temperature is examined for both laminar and turbulent flow in a black-walled flat-plate duct. The exponential-tailed band model is used to represent spectral variations in gas absorption and emission. Values of total and radiative Nusselt numbers, cold-wall-layer transmission factors, and dimensionless bulk temperatures are reported for several dimensionless axial locations and for various sets of the dimension-less controlling parameters. Even in the entrance region, self absorption by wall layer gas blocks significantly the radiation exchange between the gas core and wall. An approximate correlation is proposed for both plane-duct and pipe turbulent entrance flows.

The Effect of Molecular Gas Absorption on Radiative Heat Transfer With Scattering

1982 ◽  
Vol 104 (4) ◽  
pp. 580-586 ◽  
Author(s):  
R. O. Buckius
Keyword(s):  
Heat Transfer ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Wide Band ◽  
Gas Absorption ◽  
Molecular Gas ◽  
Absorption Properties ◽  
Pressure Limit ◽  
Band Absorption ◽  
Planar Medium

Radiative heat transfer in an isotropically scattering and nongray absorbing planar medium is investigated. General wide-band absorption quantities, including the effects of gray absorption and scattering by the scattering components and nongray absorption by the gaseous components, are considered. Analysis for the reflection, transmission, and emission from isothermal layers is presented. Numerical calculations are presented for the wide-band absorption quantities in the high-pressure limit. The effects of the scattering and absorption properties on the wide band absorption quantities are discussed.

Central kiloparsec of NGC 1326 observed with SINFONI

2020 ◽  
Vol 638 ◽  
pp. A53
Author(s):  
Nastaran Fazeli ◽  
Gerold Busch ◽  
Andreas Eckart ◽  
Françoise Combes ◽  
Persis Misquitta ◽  
...  
Keyword(s):  
Black Hole ◽  
Galaxy Evolution ◽  
Near Infrared ◽  
Velocity Fields ◽  
Molecular Gas ◽  
Nearby Galaxy ◽  
Stellar Content ◽  
Stellar Rotation ◽  
Supermassive Black Hole ◽  
Integral Field Spectrograph

Gas inflow processes in the vicinity of galactic nuclei play a crucial role in galaxy evolution and supermassive black hole growth. Exploring the central kiloparsec of galaxies is essential to shed more light on this subject. We present near-infrared H- and K-band results of the nuclear region of the nearby galaxy NGC 1326, observed with the integral-field spectrograph SINFONI mounted on the Very Large Telescope. The field of view covers 9″ × 9″ (650 × 650 pc2). Our work is concentrated on excitation conditions, morphology, and stellar content. The nucleus of NGC 1326 was classified as a LINER, however in our data we observed an absence of ionised gas emission in the central r ∼ 3″. We studied the morphology by analysing the distribution of ionised and molecular gas, and thereby detected an elliptically shaped, circum-nuclear star-forming ring at a mean radius of 300 pc. We estimate the starburst regions in the ring to be young with dominating ages of < 10 Myr. The molecular gas distribution also reveals an elongated east to west central structure about 3″ in radius, where gas is excited by slow or mild shock mechanisms. We calculate the ionised gas mass of 8 × 105 M⊙ completely concentrated in the nuclear ring and the warm molecular gas mass of 187 M⊙, from which half is concentrated in the ring and the other half in the elongated central structure. The stellar velocity fields show pure rotation in the plane of the galaxy. The gas velocity fields show similar rotation in the ring, but in the central elongated H2 structure they show much higher amplitudes and indications of further deviation from the stellar rotation in the central 1″ aperture. We suggest that the central 6″ elongated H2 structure might be a fast-rotating central disc. The CO(3–2) emission observations with the Atacama Large Millimeter/submillimeter Array reveal a central 1″ torus. In the central 1″ of the H2 velocity field and residual maps, we find indications for a further decoupled structure closer to a nuclear disc, which could be identified with the torus surrounding the supermassive black hole.

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