Atmospheric Transmittance
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Author | : William Lee Smith |
Publisher | : |
Total Pages | : 24 |
Release | : 1972 |
Genre | : Atmosphere |
ISBN | : |
This paper describes the determination of atmospheric transmittance from ground-based sun and sky radiance measurements with a prototype of the Nimbus E Infrared Temperature Profile Radiometer (ITPR).
Author | : F. X. Kneizys |
Publisher | : |
Total Pages | : 240 |
Release | : 1980 |
Genre | : Aerosols |
ISBN | : |
Author | : J. E. A. Selby |
Publisher | : |
Total Pages | : 120 |
Release | : 1975 |
Genre | : Atmospheric models |
ISBN | : |
A FORTRAN computer program, LOWTRAN 3, is described for calculating the transmittance of the atmosphere in the spectral region from 0.25 to 28.5 micrometers at a spectral resolution of 20/cm. The program provides a choice of six atmospheric models covering seasonal and latitudinal variations from sea level to 100 km, two haze models, and accounts for molecular absorption, molecular scattering, and aerosol extinction. Refraction and earth curvature effects are also included. This program provides some modifications to the molecular absorption and aerosol extinction data provided in an earlier LOWTRAN 2 report. In addition, input modifications have been made, making the LOWTRAN 3 program considerably more flexible in terms of the input of meteorological data.
Author | : William O. Gallery |
Publisher | : |
Total Pages | : 150 |
Release | : 1983 |
Genre | : Air masses |
ISBN | : |
Calculations of atmospheric transmittance and radiance require the knowledge of the integrated amounts of the absorbing gases along the path. This report describes the calculation of the integrated amounts ('air mass' or 'column density') for various infrared absorbing gases for an arbitrary slant path through the atmosphere, including the effects of both curvature and refraction, and presents a Fortran program. FSCATM, to perform the calculation. Among the features of FSCATM are: 1. It calculates the layer-by-layer integrated absorber amounts and density-weighted pressure and temperature for an arbitrary slant path through the atmosphere. 2. It assumes a spherically symmetric atmospheric with exponential profiles of density and refractivity between layer boundaries. 3. It allows a variety of options for specifying the slant path. 4. It includes six representative atmospheric profiles of pressure and temperature, and of density for the gases H2O, CO2, O3, N2O, CO, CH3, and O2 and has provision for user-supplied profiles of up to 20 gases. 5. The output layering may either be generated internally or supplied by the user. 6. It portable to 32 bit word computers in single precision and compatible with both ANSI Standard FORTRAN 66 and 77. 7. It is modular and easily modified to suit the users' particular needs. A discussion of atmospheric profile data and a survey of the literature are included in appendices.
Author | : J. E. A. Selby |
Publisher | : |
Total Pages | : 86 |
Release | : 1976 |
Genre | : Aerosols |
ISBN | : |
This supplement provides several additions and updates to the LOWTRAN 3 computer code, which can be used to calculate the transmittance of the atmosphere from the ultraviolet to the middle infrared portion of the spectrum (0.25 to 28.5 micrometers) at a spectral resolution of 20 cm. The major additions are the inclusion of water vapor continuum attenuation in the 3.5 to 4.2 micrometers region, and a temperature dependence to the H2O continuum attenuation coefficient in both the 4 micrometers and 10 micrometers regions. The contribution of foreign gas broadening in the 8-14 micrometers region has also been reduced. Four aerosol models are included in this supplement. These include three boundary layer aerosol models for maritime, urban, and rural conditions in the lower 2 km of the atmosphere, and a tropospheric model for use mainly above 1 or 2 km altitude. The rural model is a replacement for the average continental model presently in LOWTRAN 3. A temporary provision is also given to accommodate fog conditions when the visual range falls below 2 km. (Author).
Author | : F. X. Kneizys |
Publisher | : |
Total Pages | : 240 |
Release | : 1980 |
Genre | : Aerosols |
ISBN | : |
Author | : J. E. A. Selby |
Publisher | : |
Total Pages | : 104 |
Release | : 1978 |
Genre | : Aerosols |
ISBN | : |
Author | : Thomas G. Kyle |
Publisher | : Elsevier |
Total Pages | : 301 |
Release | : 2013-10-24 |
Genre | : Technology & Engineering |
ISBN | : 0080983987 |
Introduces the physical processes and meteorology required to understand the behaviour of light and radiation in the atmosphere. Integrating the treatment of atmospheric optics from the ultraviolet to the microwave, the book presents a detailed overview, together with discussions, on the associated meteorology and atmospheric composition, which gives the meteorological background necessary to deal with the varying conditions found in the real atmosphere. Mathematical details provide a concise description of results thus allowing readers with a knowledge of meteorology or a single wavelength region to comprehend the transmission, emission and scattering in all wavelength regions. Rayleigh and Mie scattering are covered as well as the aerosol and raindrop distributions found in the atmosphere. Detailed models of the atmosphere and the distribution of trace gases are supplied, and finally a chapter is devoted to standardised software and available data bases.
Author | : F. X. Kneizys |
Publisher | : |
Total Pages | : 204 |
Release | : 1983 |
Genre | : Atmospheric radiation |
ISBN | : |
Author | : Larry B. Stotts |
Publisher | : SPIE-International Society for Optical Engineering |
Total Pages | : |
Release | : 2019 |
Genre | : Atmosphere |
ISBN | : 9781510628052 |
"MODTRAN® is a powerful tool for atmospheric modeling that can intimidate newcomers. This book guides readers through test cases relevant to their interests and discusses the mathematics and atmospheric physics incorporated in the software. Over the course of eight chapters, readers will (1) devise realistic exercises to apply MODTRAN, (2) correctly set up problems (which is half the task), and (3) solve said problems"--