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4 results for “Microwave database”
Microwave Single Scattering Properties Database (Horizontally Aligned Aggregates of Dendrites)
<p>The database contains physical and microwave single scattering properties of horizontally aligned frozen hydrometeors as large as 11 cm in diameter. </p> <p>A description of the aggregation model used for particle generation can be found in:<br> Leinonen, J., and Szyrmer, W. (2015), Radar signatures of snowflake riming: A modeling study, <em>Earth and Space Science</em>, 2, 346– 358, doi:<a href="https://doi.org/10.1002/2015EA000102">10.1002/2015EA000102</a>.<br> The code used for particle generation is freely available at: <a href="https://github.com/jleinonen/aggregation">https://github.com/jleinonen/aggregation</a></p> <p>The scattering properties of particles were computed using discrete dipole approximation using ADDA software package (<a href="https://github.com/adda-team/adda">https://github.com/adda-team/adda</a>)</p> <p>Terminal velocity of snowflakes was computed using 4 hydrodynamical models that were implemented as a part of snowScat library (<a href="https://github.com/OPTIMICe-team/snowScatt">https://github.com/OPTIMICe-team/snowScatt</a>)</p> <p>Approximately one half of the snowflake structure files and one quarter of scattering properties (for X, Ku, Ka and W band) were generated for the publication of Leinonen and Szyrmer (2015). The remaining part of the dataset was generated using the ALICE High Performance Computing Facility at the University of Leicester.</p>
ARTS Microwave Single Scattering Properties Database (Oriented Particles)
<p>The database contains microwave and submillimeter wave single scattering data of azimuthally randomly oriented frozen hydrometeors. Main applications lie in polarized active/passive microwave and submillimeter wave remote sensing. This database is an independent add-on to the <a href="https://doi.org/10.5281/zenodo.1175572">ARTS Microwave Single Scattering Properties Database</a>.</p> <p>A description of the simulation methods and database is available in the following article. Please cite it if you use the database for a publication. Brath, M., Ekelund, R., Eriksson, P., Lemke, O., and Buehler, S. A.: Microwave and submillimeter wave scattering of oriented ice particles, Atmos. Meas. Tech. Discuss., <a href="https://doi.org/10.5194/amt-2019-382">https://doi.org/10.5194/amt-2019-382</a>, in review, 2019.</p> <p>The dataset contains one aggregate habit and one pristine ice crystal habit. Furthermore, 35 frequencies from 1 to 886 GHz, and 3 temperatures, 190, 230 and 270 K, are included. The data were calculated using the discrete dipole approximation method (DDA) in combination with a self developed orientation averaging approach. Interfaces for easy user access is available under a separate upload, due to different licensing, under the title <a href="https://doi.org/10.5281/zenodo.1175588">ARTS Microwave Single Scattering Properties Database Interfaces</a>, in which only the Python3 interface can be used for browsing and importing of the single scattering data of azimuthally randomly oriented. The archive InputAzimuthallyRandom.tar.gz contains the shape files, which have be used as input for the DDA simulations.</p> <p><strong>Unpacking</strong></p> <p>The data files for the oriented particles follow the same directory structure as the <a href="https://zenodo.org/record/1175573">ARTS Microwave Single Scattering Properties Database</a>. Each tar file contains an SSD directory and the subdirectories for a specific particle orientation. Furthermore, it contains as a quick overview a report of the scattering properties for total random orientation.</p> <p>If the totally randomly oriented particle database is already present, these files should be unpacked in the same location that contains the SSD folder.</p> <p>In Unix, all files can be unpacked with:</p> <pre><code class="language-bash">for ssdfile in SSD-AziRnd-ice*.tar; do tar -xvf $ssdfile done </code></pre>
Observation Database for Exploring the footprint representation of microwave radiance observations in an Arctic limited-area data assimilation system
<p>Basic matplotlib visualization for observational databases.<br>Archive files, readme, and visualisation script are attached.</p> <p>The python script visualizes the statistics related to observation <br>minus background departures for AMSU-A and MHS sensors using<br>the default and footprint observation operators in the AROME-Arctic data assimilation system.</p> <p>The corresponding preprint:<br>gmd-2023-195 | Submitted 02 Oct 2023 | Development and technical paper<br>Exploring the footprint representation of microwave radiance observations in an Arctic limited-area data assimilation system<br>Máté Mile, Stephanie Guedj, and Roger Randriamampianina </p>
Single-Scattering property database of randomly oriented very complex ice crystals in the microwave
<p>A database consisting of the single-scattering properties of budding rosette aggregates and rosette aggregates calculated at frequencies in the mm-wave and sub-mm-wave regions of the electromagnetic spectrum. The full set of single-scattering properties have been made available at the temperatures of -83 degree C, -43 degree C, and -3 degree C at the frequencies of 50, 183 and 243 GHz. Other frequencies will become available once completed in the sub-mm-wave region of the spectrum. The maximum dimensions of the ice crystals vary between 10 and 10,000 microns. The accompanying data is made available under the terms of the Non-Commercial Government License https://www.nationalarchives.gov.uk/doc/non-commercial-<br> government-licence/version/2/</p>
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OpenNeuro
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