Projects>P - R
Streamer - A Radiative Transfer ModelEntry ID: Streamer
Abstract: Streamer is a radiative transfer model that can be used for computing either radiances (intensities) or irradiances (fluxes) for a wide variety of atmospheric and surface conditions. Its interface is very flexible and easy to use. Streamer's major features are:
- Fluxes (irradiances) may be computed using two or more streams, either broadband or narrow band. For more than two streams, a discrete ... ordinate solver (DISORT) is used.
- Radiances (intensities) may be computed for any polar and azimuthal angles, using 4 or more streams. TOA (top-of-atmosphere) albedos or brightness temperatures are output along with the radiances.
- Upwelling and downwelling, shortwave, longwave, and net fluxes, cloud radiative effect ("cloud forcing"), and heating rates can be computed.
- There are 24 shortwave and 105 longwave bands.
- Gas absorption is parameterized with overlapping gases. Gaseous absorption may be turned on or off.
- Liquid and ice cloud optical properties, five aerosol optical models, and four aerosol vertical profiles are part of the model database. Clouds may be specified as some combination of particle size, water content, optical and geometrical thicknesses, or the optical properties and phase function can be input. A variety of different ice particle shapes (column, aggregate, etc.) are available. Mixed-phase clouds (liquid and ice or ice and ice) can also be specified.
- There are seven standard atmospheric profiles. Either standard or user-defined profiles can be used, or total column amounts of water vapor, ozone, and/or aerosols can be specified. Standard profiles include tropical, mid-latitude, subarctic, and arctic.
- Each computation is done for a "scene", where the scene can be a mixture of up to 50 individual cloud types occurring individually, up to 50 overlapping cloud sets, and clear sky.
- Various built-in surface types may occur within the scene: open ocean (sea water), meltponds, bare ice, snow, vegetation (four types), and dry sand. Spectral albedo and bidirectional reflectance models (BRDF) are included, or BRDF data can be input.
- A simple user command language provides looping structures for up to ten variables at a time, and output can be customized. There is an interactive (interpreted) mode and a Web interface.
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The software and data at this site are research products and are not public in the same sense as products available through data centers such as the NASA Distributed Active Archive Centers (DAAC), the NOAA Satellite Active Archive (SAA), or the National Snow and Ice Data Center (NSIDC). They are being made available with the intention of fostering collaboration between you and us. They are free, where "free" means that they are available at no cost, but does not mean unconditional use. In order to ensure that they are being used as intended, please send us a note with a brief description of your application. While we have tried to make clear their limitations, there will almost certainly be some applications that we have not addressed, and for which the data or programs are not well-suited. Additionally, if the software or data will play a significant role in a publication, the developer(s) should be included as co-author(s).
The software and data available at this site are distributed under the terms of the GNU General Public License (GPL). They are distributed as "freeware". Except when otherwise stated in writing they are provided as is without warranty of any kind, either expressed or implied, including, but not limited to, the implied fitness for a particular purpose. The entire risk as to the quality and performance of the programs and data is with you. Should the programs prove defective or the data prove erroneous, the author is under no obligation whatsoever to correct them. In no event will the author, the National Oceanic and Atmospheric Administration, the University of Wisconsin, or any other party who may modify and/or redistribute the programs be liable to you for damages, including any general, special, incidental or consequential damages arising out of the use or inability to use the programs or data. The software and data are distributed as "researchware", and are not official NOAA or University of Wisconsin products.
Export control regulations have been reviewed for both Department of Commerce Export Administration Regulations (EAR) and Department of State International Traffic in Arms Regulations (ITAR). Based on this review, software available on the Cooperative Institute for Meteorological Satellite Studies (CIMSS), University of Wisconsin-Madison web site that was developed by NOAA personnel, or jointly by NOAA and CIMSS personnel, has been determined to be exempt from export control regulations. A memo is available with more information about this assessment.
Distribution Media: Online
Fees: No fees
Role: TECHNICAL CONTACT
Email: jkey at ssec.wisc.edu
NOAA/NESDIS Space Science and Engineering Center University of Wisconsin at Madison 1225 W. Dayton St.
Province or State: WI
Postal Code: 53706
Role: TECHNICAL CONTACT
Email: axel at apl.washington.edu
Applied Physics Laboratory University of Washington 1013 NE 40th Street
Province or State: WA
Postal Code: 98105-6698
Role: SERF AUTHOR
Email: Tyler.B.Stevens at nasa.gov
5700 Rivertech Court
Province or State: MD
Postal Code: 20737
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